阅读说明：本技术 一种直流电源电路及空调器 (Direct current power supply circuit and air conditioner ) 是由 杨帅 牛建勇 陈建兵 于 2020-05-15 设计创作，主要内容包括：本发明公开了一种直流电源电路及空调器,该直流电源电路包括整流单元、第一电源转换单元和第二电源转换单元,还包括第一连接元件和第二连接元件,所述整流单元的输入端连接交流电源,所述整流单元的输出端、所述第一电源转换单元的输入端均与所述第一连接元件的第一端连接,所述第二连接元件的第一端与所述第一电源转换单元的输出端连接,所述第一连接元件的第二端、所述第二连接元件的第二端均与所述第二电源转换单元的输入端连接；其中,所述第一连接元件和所述第二连接元件为安装或拆除状态,从而基于不同的负载功耗要求对第一连接元件和第二连接元件进行拆装,使直流电源电路在满足特定负载功耗要求的同时降低成本。(The invention discloses a direct-current power supply circuit and an air conditioner, wherein the direct-current power supply circuit comprises a rectifying unit, a first power supply conversion unit, a second power supply conversion unit, a first connecting element and a second connecting element, wherein the input end of the rectifying unit is connected with an alternating-current power supply, the output end of the rectifying unit and the input end of the first power supply conversion unit are both connected with the first end of the first connecting element, the first end of the second connecting element is connected with the output end of the first power supply conversion unit, and the second end of the first connecting element and the second end of the second connecting element are both connected with the input end of the second power supply conversion unit; the first connecting element and the second connecting element are in an installing or dismantling state, so that the first connecting element and the second connecting element are dismantled and installed based on different load power consumption requirements, and the cost of the direct-current power supply circuit is reduced while the specific load power consumption requirements are met.)

1. A DC power supply circuit comprises a rectifying unit, a first power supply conversion unit and a second power supply conversion unit, and is characterized by further comprising a first connecting element and a second connecting element,

the input end of the rectifying unit is connected with an alternating current power supply, the output end of the rectifying unit and the input end of the first power supply conversion unit are both connected with the first end of the first connecting element, the first end of the second connecting element is connected with the output end of the first power supply conversion unit, and the second end of the first connecting element and the second end of the second connecting element are both connected with the input end of the second power supply conversion unit;

wherein the first connecting element and the second connecting element are in an installed or removed state.

2. The DC power supply circuit of claim 1, wherein the second power conversion unit is a DC/DC switching power supply circuit or an LDO linear regulator circuit,

if the second power conversion unit is the DC/DC switching power supply circuit, the first connecting element is in an installation state, and the second connecting element is in a removal state;

if the second power conversion unit is the LDO linear regulator circuit, the first connecting element is in a dismounted state, and the second connecting element is in an installed state.

3. The direct current power supply circuit of claim 2, wherein the DC/DC switching power supply circuit and the LDO linear regulator circuit are packaged in a uniform size.

4. The dc power supply circuit of claim 1, wherein the rectifying unit further comprises a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit further comprises a third capacitor, a fourth capacitor, and a second ground terminal, and the second power conversion unit further comprises a fifth capacitor, a sixth capacitor, and a third ground terminal;

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

5. An air conditioner characterized by comprising the direct-current power supply circuit according to any one of claims 1 to 4, and further comprising:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

6. A DC power supply circuit comprises a rectifying unit, a first power supply conversion unit and a second power supply conversion unit, and is characterized in that the DC power supply circuit also comprises a connecting element,

the input end of the rectifying unit is connected with an alternating current power supply, the output end of the rectifying unit and the input end of the first power supply conversion unit are both connected with the first end of the connecting element, the second end of the connecting element is connected with the input end of the second power supply conversion unit, and the second power supply conversion unit is a DC/DC switching power supply circuit.

7. The direct-current power supply circuit according to claim 6, wherein the rectifying unit further includes a first capacitor, a second capacitor, a first ground terminal, the first power conversion unit further includes a third capacitor, a fourth capacitor, and a second ground terminal, the second power conversion unit further includes a fifth capacitor, a sixth capacitor, and a third ground terminal,

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

8. An air conditioner characterized by comprising the direct-current power supply circuit according to claim 6 or 7, and further comprising:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

9. A DC power supply circuit comprises a rectifying unit, a first power supply conversion unit and a second power supply conversion unit, and is characterized in that the DC power supply circuit also comprises a connecting element,

alternating current power supply is connected to rectifier unit's input, rectifier unit's output is connected first power conversion unit's input, connecting element's first end with first power conversion unit's output is connected, connecting element's second end with second power conversion unit's input is connected, wherein, second power conversion unit is LDO linear voltage regulator circuit.

10. The direct current power supply circuit according to claim 9, wherein the rectifying unit further includes a first capacitor, a second capacitor, a first ground terminal, the first power conversion unit further includes a third capacitor, a fourth capacitor, and a second ground terminal, the second power conversion unit further includes a fifth capacitor, a sixth capacitor, and a third ground terminal,

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

11. An air conditioner characterized by comprising the direct-current power supply circuit according to claim 9 or 10, and further comprising:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

Technical Field

The present disclosure relates to the field of dc power supply technologies, and more particularly, to a dc power supply circuit and an air conditioner.

Background

According to the load power consumption and the requirement of cost, the common processing method of the prior art when configuring the air conditioner direct current power supply circuit is to convert the power supply after a rectifying bridge, or to use an LDO (low dropout Regulator) linear Regulator or a DC/DC switching power supply as the selection of the power supply conversion method.

The two power conversion modes have the following characteristics: generally, a DC/DC switching power supply can support wider input voltage and higher output capability, the power supply conversion efficiency is higher, the size is small, but the cost is higher; for the LDO linear voltage regulator, the cost is low, but the power conversion efficiency is also low.

The air conditioner direct-current power supply circuit generally comprises a 12V output power supply and a 5V output power supply, and generally, different product load power consumption requirements can be met for the 5V direct-current power supply in the direct-current power supply circuit, and the following problems exist when the two power supply conversion modes are selected based on the 5V direct-current power supply in the prior art:

under the application scene of low power consumption, for example, no intelligent functions such as networking function exist, if a DC/DC switching power supply scheme with higher cost is still used, the cost is overhigh; under the high-power consumption application scene, for example, there is the intelligent function of networking function high-power consumption, if still use LDO linear voltage regulator, then need be equipped with the radiator of certain volume, can occupy more printed circuit board's area, otherwise probably because of output current is great, obvious generate heat and scald the phenomenon, probably burn out the voltage regulator even.

Therefore, how to provide a dc power circuit that satisfies the power consumption requirement of a specific load on the basis of reducing the cost is a technical problem to be solved at present.

Disclosure of Invention

The invention provides a direct-current power supply circuit and an air conditioner, which are used for solving the technical problem that the direct-current power supply circuit in the prior art cannot meet the power consumption requirement of a specific load and simultaneously reduce the cost.

In the dc power supply circuit provided in the first embodiment of the present invention, the dc power supply circuit includes a rectifying unit, a first power conversion unit, and a second power conversion unit, and further includes a first connecting element and a second connecting element,

the input end of the rectifying unit is connected with an alternating current power supply, the output end of the rectifying unit and the input end of the first power supply conversion unit are both connected with the first end of the first connecting element, the first end of the second connecting element is connected with the output end of the first power supply conversion unit, and the second end of the first connecting element and the second end of the second connecting element are both connected with the input end of the second power supply conversion unit;

wherein the first connecting element and the second connecting element are in an installed or removed state.

In the DC power circuit provided in the first embodiment of the present invention, the second power conversion unit is a DC/DC switching power circuit or an LDO linear regulator circuit,

if the second power conversion unit is the DC/DC switching power supply circuit, the first connecting element is in an installation state, and the second connecting element is in a removal state;

if the second power conversion unit is the LDO linear regulator circuit, the first connecting element is in a dismounted state, and the second connecting element is in an installed state.

In the DC power supply circuit according to the first embodiment of the present invention, the package sizes of the DC/DC switching power supply circuit and the LDO linear regulator circuit are the same.

In the dc power circuit provided in the first embodiment of the present invention, the rectifying unit further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit further includes a third capacitor, a fourth capacitor, and a second ground terminal, and the second power conversion unit further includes a fifth capacitor, a sixth capacitor, and a third ground terminal;

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

In a second embodiment of the present invention, an air conditioner includes the dc power supply circuit according to the first embodiment, and further includes:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

In a dc power supply circuit provided by a third embodiment of the present invention, including a rectifying unit, a first power conversion unit, and a second power conversion unit, the dc power supply circuit further includes a connection element,

the input end of the rectifying unit is connected with an alternating current power supply, the output end of the rectifying unit and the input end of the first power supply conversion unit are both connected with the first end of the connecting element, the second end of the connecting element is connected with the input end of the second power supply conversion unit, and the second power supply conversion unit is a DC/DC switching power supply circuit.

In the dc power circuit provided in the third embodiment of the present invention, the rectifying unit further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit further includes a third capacitor, a fourth capacitor, and a second ground terminal, the second power conversion unit further includes a fifth capacitor, a sixth capacitor, and a third ground terminal,

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

An air conditioner according to a fourth embodiment of the present invention includes the dc power supply circuit according to the third embodiment, and further includes:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

In a dc power circuit provided in a fifth embodiment of the present invention, the dc power circuit includes a rectifying unit, a first power converting unit, and a second power converting unit, and further includes a connecting element,

alternating current power supply is connected to rectifier unit's input, rectifier unit's output is connected first power conversion unit's input, connecting element's first end with first power conversion unit's output is connected, connecting element's second end with second power conversion unit's input is connected, wherein, second power conversion unit is LDO linear voltage regulator circuit.

In the dc power circuit provided in the fifth embodiment of the present invention, the rectifying unit further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit further includes a third capacitor, a fourth capacitor, and a second ground terminal, the second power conversion unit further includes a fifth capacitor, a sixth capacitor, and a third ground terminal,

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power supply conversion unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power supply conversion unit, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

In an air conditioner according to a sixth embodiment of the present invention, the air conditioner includes the dc power supply circuit according to the fifth embodiment, and further includes:

the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;

the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;

one of the outdoor heat exchanger and the indoor heat exchanger works for the condenser, and the other works for the evaporator;

the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;

an indoor environment temperature sensor for detecting an indoor environment temperature;

and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.

In the DC power supply circuit provided in the first embodiment and the air conditioner provided in the second embodiment of the present invention, for high load power consumption, excessive heat generation of the first power conversion unit is not caused, and it is avoided that a separate heat sink is provided in the first power conversion unit, and at the same time, the second power conversion unit employs a DC/DC switching power supply circuit, which improves power conversion efficiency; for low load power consumption, excessive heating of the first power conversion unit is avoided, an independent radiator is prevented from being arranged in the first power conversion unit, and meanwhile, the second power conversion unit adopts an LDO (low dropout regulator) linear voltage regulator circuit, so that low cost can be realized while the requirement of a low current load is met.

In the DC power supply circuit provided in the third embodiment and the air conditioner provided in the fourth embodiment of the present invention, excessive heat generation of the first power conversion unit is not caused, and a separate heat sink is not provided in the first power conversion unit, and at the same time, the DC/DC switching power supply circuit is used in the second power conversion unit, thereby improving the power conversion efficiency.

In the dc power supply circuit according to the fifth embodiment of the present invention and the air conditioner according to the sixth embodiment of the present invention, excessive heating of the first power conversion unit is not caused, and a separate heat sink is not disposed in the first power conversion unit, and meanwhile, the second power conversion unit employs an LDO linear regulator circuit, so that a low-cost operation can be achieved while a low-current load requirement is satisfied.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a perspective view showing an external appearance of an air conditioner according to an embodiment.

Fig. 2 is a circuit diagram schematically showing the configuration of an air conditioner according to the embodiment.

Fig. 3 is a block diagram showing an outline of the configuration of the control system of the air conditioner.

Fig. 4 shows a schematic structural diagram of a dc power circuit according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a dc power circuit according to another embodiment of the present invention.

Fig. 6 shows a schematic structural diagram of a dc power circuit according to another embodiment of the present invention.

Fig. 7 shows a circuit diagram of a dc power supply compatible with various power consumption loads in an embodiment of the present invention.

Fig. 8 shows an equivalent circuit diagram of the high power consumption mode dc power supply circuit in the embodiment of the present invention.

Fig. 9 shows an equivalent circuit diagram of the low power consumption mode dc power supply circuit in the embodiment of the present invention.

Description of the reference symbols

1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 10: a refrigerant circuit; 11: a compressor; 12: a four-way switching valve; 13: an outdoor heat exchanger;

14: an expansion valve; 16: an indoor heat exchanger; 21: an outdoor fan; 31: an indoor fan; 32: an indoor temperature sensor; 33: an indoor heat exchanger temperature sensor;

63: a vertical baffle; 64, 65: a horizontal baffle.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is exemplified by an indoor unit (shown in the figure), and the indoor unit is usually mounted on an indoor wall surface WL or the like. For another example, an indoor cabinet (not shown) is also an indoor unit of the indoor unit.

The outdoor unit 2 is generally installed outdoors and used for heat exchange in an indoor environment. In the illustration of fig. 1, the outdoor unit 2 is indicated by a broken line because the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 with respect to the wall surface WL.

Fig. 2 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of executing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected by a connecting pipe 4 to form a refrigerant circuit 10 in which a refrigerant circulates.

Further, as shown in fig. 3, the air conditioner 1 is provided with a control unit 50 for controlling the operation of each component in the air conditioner inside so that each component of the air conditioner 1 operates to realize each predetermined function of the air conditioner. The air conditioner 1 is further provided with a remote controller 5, and the remote controller 5 has a function of communicating with the control unit 50 using, for example, infrared rays or other communication methods. The remote controller 5 is used for various controls of the air conditioner by a user, and interaction between the user and the air conditioner is realized.

As described in the background art, when a 5V DC power supply in an air conditioning DC power supply circuit in the prior art faces different product load power consumption requirements, a DC/DC switching power supply is adopted, which meets the load power consumption requirements but causes the cost to be too high; or, the LDO linear regulator is adopted, which reduces the cost, but causes the phenomenon of obvious heating and scalding, so that the specific load power consumption requirement of the dc power circuit in the prior art cannot be matched with the cost.

In order to solve the above problem, an embodiment of the present application provides a dc power circuit, where a first connection element and a second connection element are configured in the dc power circuit, and the first connection element and the second connection element are disassembled and assembled based on different load power consumption requirements, so that the dc power circuit meets the specific load power consumption requirement and reduces the cost at the same time.

Fig. 4 is a schematic structural diagram of a dc power circuit according to an embodiment of the present invention, the dc power circuit includes a rectifying unit 101, a first power converting unit 102, a second power converting unit 103, a first connecting element 104, and a second connecting element 105,

an input end of the rectifying unit 101 is connected to an alternating current power supply, an output end of the rectifying unit 101 and an input end of the first power conversion unit 102 are both connected to a first end of the first connecting element 104, a first end of the second connecting element 105 is connected to an output end of the first power conversion unit 102, and a second end of the first connecting element 104 and a second end of the second connecting element 105 are both connected to an input end of the second power conversion unit 103;

wherein the first connecting element 104 and the second connecting element 105 are in an installed or removed state.

Specifically, the rectifying unit 101 may be a rectifying bridge, and is configured to convert an ac power into a dc power and input the dc power to the first power conversion unit 102, the first power conversion unit 102 may be a low-cost LDO linear regulator, and is configured to output a first dc power, where the voltage of the first dc power may be 12V, and is mainly configured to supply power to loads such as relays, stepping motors, and valve drivers, and the second power conversion unit 103 is configured to output a second dc power, and the dc power may be 5V, as long as it is configured to supply power to loads such as a controller CPU, signal acquisition, a sensing signal, and a communication function. The first connection element 104 and said second connection element 105 are removable elements, which may be, for example, jumpers or zero ohm resistors. Different second power conversion units may be switched in depending on the removal state or the installation state of the first connection element 104 and said second connection element 105.

In order to meet different load power consumption requirements, in the preferred embodiment of the present application, the second power conversion unit 103 is a DC/DC switching power supply circuit or an LDO linear regulator circuit,

if the second power conversion unit 103 is the DC/DC switching power circuit, the first connection element 104 is in an installation state, and the second connection element 105 is in a removal state;

if the second power conversion unit 103 is the LDO linear regulator circuit, the first connection element 104 is in a removed state, and the second connection element 105 is in an installed state.

Specifically, the LDO linear voltage regulator circuit adopts a low dropout linear voltage regulator, and realizes power supply voltage stabilization through voltage transformation, rectification, filtering and voltage stabilization. The advantages are that: the stability is good, the transient response speed is fast, the reliability is high, the output voltage precision is high, and the output ripple voltage precision is small. The disadvantages are as follows: the conversion efficiency is low, especially in the case of a large input-output voltage difference. If the output current is also large, the phenomenon of obvious heating and scalding can occur, and even the voltage stabilizer can be burnt out, so that additional heat dissipation is needed.

The DC/DC switching power supply circuit is used to convert a high-voltage (low-voltage) DC power supply into a low-voltage (high-voltage) DC power supply. The advantages are that: the power consumption is low and the efficiency is high; the volume is small and the weight is light; the voltage stabilizing range is wide. The disadvantages are as follows: the cost is high.

When the air conditioner includes an intelligent function, such as a networking function, and the load current is relatively large, for example, greater than 500mA, the load power consumption of the second power conversion unit 103 is relatively high, and at this time, the second power conversion unit 103 needs to adopt a DC/DC switching power supply circuit, and install the first connection element 104 and remove the second connection element 105. Because the DC/DC switching power supply circuit can meet wider input voltage, the power supply conversion efficiency is higher, the output current is higher, the current is directly divided into two branches from the rear of the rectifying unit 101, and the current flowing to the second power supply conversion unit 103 does not pass through the first power supply conversion unit 102, so that excessive heating of the first power supply conversion unit 102 cannot be caused.

When the air conditioner has no intelligent function and the load current is relatively small, for example, less than 500mA, the load power consumption of the second power conversion unit 103 is relatively low, the second power conversion unit 103 needs to adopt an LDO linear regulator circuit, remove the first connection element 104, and install the second connection element 105. The output of the LDO linear voltage regulator circuit can meet the requirement of a low current load, and low cost can be realized. At this time, the input current of the second power conversion unit 103 is output from the first power conversion unit 102, and the input current is small, so that excessive heat generation of the first power conversion unit 102 is not caused.

It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and a person skilled in the art can select other power conversion circuits according to practical situations and flexibly adjust the dismounting and mounting states of the first connecting element 104 and the second connecting element 105 according to different power conversion circuits, which does not affect the protection scope of the present application.

To facilitate replacement of the second power conversion unit 103, in the preferred embodiment of the present application, the package size of the DC/DC switching power supply circuit and the LDO linear regulator circuit are the same.

Specifically, the DC/DC switching power supply circuit and the LDO linear voltage regulator circuit are interchanged on the printed circuit board corresponding to the DC power supply circuit by making the packaging sizes of the DC/DC switching power supply circuit and the LDO linear voltage regulator circuit consistent.

In order to improve the stability of the electric energy in the dc power circuit and provide reliable electric energy, in a preferred embodiment of the present application, the rectifying unit 101 further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit 102 further includes a third capacitor, a fourth capacitor, and a second ground terminal, and the second power conversion unit 103 further includes a fifth capacitor, a sixth capacitor, and a third ground terminal;

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit 101, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power conversion unit 102, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power conversion unit 103, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

Specifically, the first capacitor and the second capacitor with the filtering function are connected to the output end of the rectifying unit 101, so that the stability of the electric energy output by the rectifying unit 101 is improved; the output end of the first power conversion unit 102 is connected with a third capacitor and a fourth capacitor which have a filtering function, so that the stability of the electric energy output by the first power conversion unit 102 is improved; the output end of the second power conversion unit 103 is connected with a fifth capacitor and a sixth capacitor which have a filtering function, so that the stability of the electric energy output by the second power conversion unit 103 is improved. The rectifying unit 101, the first power conversion unit 102, and the second power conversion unit 103 further include ground terminals, and a dc loop is formed by grounding the ground terminals, so as to supply electric power to the outside.

It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and those skilled in the art can flexibly select other kinds and different numbers of filter elements, which does not affect the protection scope of the present application.

Through applying above technical scheme, through configuration first connecting element and second connecting element in DC power supply circuit to carry out dismouting to first connecting element and second connecting element based on different load power consumption requirements. For high load power consumption, the second power supply conversion unit is directly connected to the output end of the rectification unit based on the first connecting element, so that the current flowing to the second power supply conversion unit does not pass through the first power supply conversion unit, excessive heating of the first power supply conversion unit is avoided, an independent radiator is prevented from being arranged in the first power supply conversion unit, and meanwhile, the second power supply conversion unit adopts a DC/DC switching power supply circuit, so that the power supply conversion efficiency is improved; for low load power consumption, the second power conversion unit is directly connected to the output end of the first power conversion unit based on the second connecting element, at the moment, the input current of the second power conversion unit is output by the first power conversion unit, and the input current is small, so that excessive heating of the first power conversion unit is avoided, an independent radiator is prevented from being arranged in the first power conversion unit, meanwhile, the second power conversion unit adopts an LDO (low dropout regulator) linear regulator circuit, low cost can be realized while the requirement of a low current load is met, and the cost of the direct current power supply circuit is reduced while the requirement of specific load power consumption is met.

Fig. 5 is a schematic structural diagram of a dc power circuit according to another embodiment of the present invention, the dc power circuit includes a rectifying unit 201, a first power conversion unit 202, a second power conversion unit 203, and a connecting element 204,

the input end of the rectifying unit 201 is connected to an alternating current power supply, the output end of the rectifying unit 201 and the input end of the first power conversion unit 202 are both connected to the first end of the connecting element 204, the second end of the connecting element 204 is connected to the input end of the second power conversion unit 203, wherein the second power conversion unit 203 is a DC/DC switching power supply circuit.

Specifically, the rectifying unit 201 may be a rectifying bridge, and is configured to convert an ac power into a dc power and input the dc power to the first power conversion unit 202, the first power conversion unit 202 may be a low-cost LDO linear regulator, and is configured to output a first dc power, where the voltage of the first dc power may be 12V, and is mainly configured to supply power to loads such as relays, stepping motors, and valve drivers, and the second power conversion unit 203 is configured to output a second dc power, and the dc power may be 5V, as long as it is configured to supply power to loads such as a controller CPU, signal acquisition, a sensing signal, and a communication function. The connecting element 204 is a removable element that may be, for example, a jumper or a zero ohm resistor.

When the air conditioner includes an intelligent function, such as a networking function, and the load current is relatively large, for example, greater than 500mA, the load power consumption of the second power conversion unit 203 is relatively high, and at this time, the second power conversion unit 203 needs to adopt a DC/DC switching power supply circuit, and the output terminal of the rectification unit 201 and the input terminal of the second power conversion unit 203 are connected through the connection element 204. Because the DC/DC switching power supply circuit can meet wider input voltage, the power supply conversion efficiency is higher, the output current is higher, and the current flowing to the second power supply conversion unit 203 from the rectifying unit 201 directly does not pass through the first power supply conversion unit 202, the excessive heating of the first power supply conversion unit 202 can not be caused.

In order to improve the stability of the electric energy in the dc power circuit and provide reliable electric energy, in a preferred embodiment of the present application, the rectifying unit 201 further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit 202 further includes a third capacitor, a fourth capacitor, and a second ground terminal, and the second power conversion unit 203 further includes a fifth capacitor, a sixth capacitor, and a third ground terminal;

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit 201, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power conversion unit 202, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power conversion unit 203, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

Specifically, the output end of the rectifying unit 201 is connected with the first capacitor and the second capacitor which have the filtering function, so that the stability of the electric energy output by the rectifying unit 201 is improved; the output end of the first power conversion unit 202 is connected with a third capacitor and a fourth capacitor which have a filtering function, so that the stability of the electric energy output by the first power conversion unit 202 is improved; the output end of the second power conversion unit 203 is connected with a fifth capacitor and a sixth capacitor which have a filtering function, so that the stability of the electric energy output by the second power conversion unit 203 is improved. The rectifying unit 201, the first power conversion unit 202, and the second power conversion unit 203 further include ground terminals, and a dc loop is formed by grounding the ground terminals, so as to supply electric power to the outside.

It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and those skilled in the art can flexibly select other kinds and different numbers of filter elements, which does not affect the protection scope of the present application.

Through using above technical scheme, dispose connecting element in DC power supply circuit, and based on connecting element with the output of second power supply conversion unit direct access rectifier unit, make the electric current that flows to second power supply conversion unit not pass through first power supply conversion unit, can not cause first power supply conversion unit excessive heating like this, avoided setting up solitary radiator in first power supply conversion unit, second power supply conversion unit adopts DC/DC switching power supply circuit simultaneously, power conversion efficiency has been improved, thereby make DC power supply circuit reduce cost when satisfying specific load consumption requirement.

Fig. 6 is a schematic structural diagram of a dc power circuit according to another embodiment of the present invention, the dc power circuit includes a rectifying unit 301, a first power conversion unit 302, a second power conversion unit 303, and a connecting element 304,

an alternating current power supply is connected to the input of rectification unit 301, the input of first power conversion unit 302 is connected to the output of rectification unit 301, the first end of connecting element 304 with the output of first power conversion unit 302 is connected, the second end of connecting element 304 with the input of second power conversion unit 303 is connected, wherein, second power conversion unit 303 is the LDO linear regulator circuit.

Specifically, the rectifying unit 301 may be a rectifying bridge, and is configured to convert an ac power into a dc power and input the dc power to the first power conversion unit 302, the first power conversion unit 302 may be a low-cost LDO linear regulator, and is configured to output a first dc power, where the voltage of the first dc power may be 12V, and is mainly configured to supply power to loads such as relays, stepping motors, and valve drivers, and the second power conversion unit 303 is configured to output a second dc power, and the dc power may be 5V, as long as it is configured to supply power to loads such as a controller CPU, signal acquisition, a sensing signal, and a communication function. The connecting element 304 is a removable element that may be, for example, a jumper or a zero ohm resistor.

When the air conditioner has no intelligent function and the load current is relatively low, for example, less than 500mA, the load power consumption of the second power conversion unit 303 is relatively low, and at this time, the second power conversion unit 303 needs to adopt an LDO linear regulator circuit and is connected to the first power conversion unit 302 and the second power conversion unit 303 through the connection element 304. The output of the LDO linear voltage regulator circuit can meet the requirement of a low current load, and low cost can be realized. At this time, the input current of the second power conversion unit 303 is output from the first power conversion unit 302, and the input current is small, so that excessive heat generation of the first power conversion unit 302 is not caused.

In order to improve the stability of the electric energy in the dc power circuit and provide reliable electric energy, in a preferred embodiment of the present application, the rectifying unit 301 further includes a first capacitor, a second capacitor, and a first ground terminal, the first power conversion unit 302 further includes a third capacitor, a fourth capacitor, and a second ground terminal, and the second power conversion unit 303 further includes a fifth capacitor, a sixth capacitor, and a third ground terminal;

the first end of the first capacitor and the first end of the second capacitor are both connected with the output end of the rectifying unit 301, the first end of the third capacitor and the first end of the fourth capacitor are both connected with the output end of the first power conversion unit 302, the first end of the fifth capacitor and the first end of the sixth capacitor are both connected with the output end of the second power conversion unit 303, and the second ends corresponding to the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all grounded;

the first ground terminal, the second ground terminal, and the third ground terminal are all grounded.

Specifically, the first capacitor and the second capacitor with the filtering function are connected to the output end of the rectifying unit 301, so that the stability of the electric energy output by the rectifying unit 301 is improved; the output end of the first power conversion unit 302 is connected with a third capacitor and a fourth capacitor which have a filtering function, so that the stability of the electric energy output by the first power conversion unit 302 is improved; the output end of the second power conversion unit 303 is connected with a fifth capacitor and a sixth capacitor which have a filtering function, so that the stability of the electric energy output by the second power conversion unit 303 is improved. The rectifying unit 301, the first power conversion unit 302, and the second power conversion unit 303 further include ground terminals, and a dc loop is formed by grounding the ground terminals, so as to supply electric power to the outside.

It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and those skilled in the art can flexibly select other kinds and different numbers of filter elements, which does not affect the protection scope of the present application.

Through using above technical scheme, dispose connecting element in DC power supply circuit, and based on connecting element with the output of second power conversion unit direct access first power conversion unit, the input current of second power conversion unit is exported by first power conversion unit this moment, because of this input current is less, can not be to causing first power conversion unit excessive heating, avoided setting up solitary radiator in first power conversion unit, second power conversion unit adopts LDO linear voltage regulator circuit simultaneously, can realize low cost when satisfying the low current load demand, thereby make DC power supply circuit reduce cost when satisfying specific load consumption requirement.

In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.

An embodiment of the present invention provides a dc power circuit, which may be used to supply power to an electronic control platform of an air conditioning product, and as shown in fig. 7, the dc power circuit is compatible with multiple power consumption loads, and the dc power circuit includes a rectifier bridge VC1, a first power conversion unit U1, a second power conversion unit U2, a first connection element J1, and a second connection element J2, where an output voltage of the first power conversion unit U1 is 12V, and an output voltage of the second power conversion unit U2 is 5V. The second power conversion unit U2 may be a DC/DC switching power supply circuit or an LDO linear regulator circuit, and the first connection element J1 and the second connection element J2 may be in a mounted state or a dismounted state according to different load power consumptions of the second power conversion unit U2.

To control cost, the first power conversion unit U1 may be a low cost LDO linear regulator circuit. In order to facilitate direct interchange of the DC/DC switching power supply circuit or the LDO linear voltage regulator circuit, the DC/DC switching power supply circuit can be made into a single small plate, so that the packaging size of the DC/DC switching power supply circuit is consistent with that of the LDO linear voltage regulator circuit. The first connection element J1 and the second connection element J2 can be jumpers or zero ohm resistors that meet power requirements.

According to different load power consumptions of the second power conversion unit U2, the configuration process of the dc power circuit shown in fig. 7 is as follows:

when the air conditioner includes an intelligent function, such as a networking function, and the load current is relatively large, for example, greater than 500mA, the load power consumption of the second power conversion unit U2 is relatively high, and the DC power circuit is configured in a high power consumption mode, specifically, the first connection element J1 is installed, and the second connection element J2 is removed, and meanwhile, the second power conversion unit U2 adopts a DC/DC switching power circuit, and an equivalent circuit thereof is shown in fig. 8. Because the DC/DC switching power supply circuit can meet wider input voltage, the power supply conversion efficiency is higher, the output current is higher, the current is directly divided into two branches from the rear of the rectifier bridge, and the current flowing to the second power supply conversion unit U2 does not pass through the first power supply conversion unit U1, so that excessive heating of the first power supply conversion unit U1 is avoided.

When the air conditioner has no intelligent function and the load current is relatively low, for example, less than 500mA, the load power consumption of the second power conversion unit U2 is relatively low, and the dc power circuit is configured in a low power consumption mode, specifically, the first connection element J1 is removed, and the second connection element J2 is installed, and meanwhile, the second power conversion unit U2 adopts an LDO linear regulator circuit, and an equivalent circuit thereof is shown in fig. 9. The output of the LDO linear voltage regulator circuit can meet the requirement of a low current load, and low cost can be realized. At this time, the input current of the second power conversion unit U2 is output from the first power conversion unit U1, and the input current is small, so that excessive heat generation of the first power conversion unit U1 is not caused.

As shown in fig. 7-9, the output end of the rectifier bridge VC1 is further connected with a first capacitor C1 and a second capacitor C2 having a filtering function, so that the stability of the electric energy output by the rectifier bridge VC1 is improved; the output end of the first power conversion unit U1 is also connected with a third capacitor C3 and a fourth capacitor C4 which have a filtering effect, so that the stability of the electric energy output by the first power conversion unit U1 is improved; the output end of the second power conversion unit U1 is further connected with a fifth capacitor C5 and a sixth capacitor C6 having a filtering function, so that the stability of the electric energy output by the second power conversion unit U2 is improved. The rectifier bridge VC1, the first power conversion unit U1, and the second power conversion unit U2 further include ground terminals, and a dc loop is formed by the ground terminals, so as to provide power to the outside.

Through applying above technical scheme, through configuration first connecting element and second connecting element in DC power supply circuit to carry out dismouting to first connecting element and second connecting element based on different load power consumption requirements. For high load power consumption, the second power supply conversion unit is directly connected to the output end of the rectification unit based on the first connecting element, so that the current flowing to the second power supply conversion unit does not pass through the first power supply conversion unit, excessive heating of the first power supply conversion unit is avoided, an independent radiator is prevented from being arranged in the first power supply conversion unit, and meanwhile, the second power supply conversion unit adopts a DC/DC switching power supply circuit, so that the power supply conversion efficiency is improved; for low load power consumption, the second power conversion unit is directly connected to the output end of the first power conversion unit based on the second connecting element, at the moment, the input current of the second power conversion unit is output by the first power conversion unit, and the input current is small, so that excessive heating of the first power conversion unit is avoided, an independent radiator is prevented from being arranged in the first power conversion unit, meanwhile, the second power conversion unit adopts an LDO (low dropout regulator) linear regulator circuit, low cost can be realized while the requirement of a low current load is met, and the cost of the direct current power supply circuit is reduced while the requirement of specific load power consumption is met.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.