阅读说明：本技术 一种采用高效防浪涌的冰箱变频控制器 (Refrigerator frequency conversion controller adopting efficient anti-surge ) 是由 周焜 于 2020-04-24 设计创作，主要内容包括：本发明涉及一种采用高效防浪涌的冰箱变频控制器,包括：主电路,用以接收交流驱动电压,并根据驱动电压控制冰箱的变频压缩机工作,其中所述主电路具有用以抑制浪涌电流的热敏电阻；及控制电路,与所述热敏电阻并联,用以检测所述主电路的工作状态,当所述主电路完成启动,所述控制电路控制所述热敏电阻短路。本发明上述实施方式中的一种采用高效防浪涌的冰箱变频控制器,当主电路进入稳定状态后,直接利用控制电路将热敏电阻短路,将整个驱动电路的损耗降低到可以忽略。(The invention relates to a refrigerator frequency conversion controller adopting high-efficiency anti-surge, which comprises: the main circuit is used for receiving an alternating current driving voltage and controlling the variable frequency compressor of the refrigerator to work according to the driving voltage, and the main circuit is provided with a thermistor used for inhibiting surge current; and the control circuit is connected with the thermistor in parallel and used for detecting the working state of the main circuit, and when the main circuit is started, the control circuit controls the thermistor to be in short circuit. In the embodiment of the invention, the efficient anti-surge frequency conversion controller of the refrigerator is adopted, and when the main circuit enters a stable state, the thermistor is directly short-circuited by using the control circuit, so that the loss of the whole drive circuit is reduced to be negligible.)

1. The utility model provides an adopt high-efficient surge-proof refrigerator frequency conversion controller which characterized in that includes:

the main circuit is used for receiving an alternating current driving voltage and controlling the variable frequency compressor of the refrigerator to work according to the driving voltage, and the main circuit is provided with a thermistor used for inhibiting surge current; and

and the control circuit is connected with the thermistor in parallel and used for detecting the working state of the main circuit, and when the main circuit is started, the control circuit controls the thermistor to be in short circuit.

2. The inverter controller for a refrigerator employing high efficiency surge protection according to claim 1, wherein the control circuit comprises:

the base of the NPN transistor is used for receiving a feedback signal of the main circuit, and the collector of the NPN transistor is connected to a direct current supply voltage through a first resistor;

the base electrode of the PNP transistor is electrically connected with the collector electrode of the NPN transistor, and the emitter electrode of the PNP transistor is connected with a direct current supply voltage;

the relay is connected with the thermistor in parallel, and one electrode of the relay is electrically connected with the emitting electrode of the PNP transistor; and

and a second capacitor connected between the collector of the NPN transistor and the other electrode of the relay.

3. The inverter controller for a refrigerator employing high efficiency surge protection according to claim 2, wherein the relay comprises:

the normally open switch is connected with the thermistor in parallel; and

and the coil is used for controlling the normally open switch to be closed or opened.

4. The inverter controller for a refrigerator with high efficiency and surge protection according to claim 2, wherein the control circuit further comprises:

the first diode is electrically connected between the two electrodes of the relay, and the cathode of the first diode is electrically connected to the collector electrode of the PNP transistor;

and the anode of the second diode is electrically connected to the anode of the first diode, and the cathode of the second diode is grounded.

5. The inverter controller for a refrigerator with high efficiency and surge protection according to claim 2, wherein the control circuit further comprises:

the second resistor is electrically connected between the collector of the NPN transistor and the base of the PNP transistor;

and the third resistor is electrically connected to the base of the NPN transistor.

6. The inverter controller for a refrigerator with high efficiency and surge protection according to claim 2, wherein the emitter of the NPN transistor is grounded.

7. The inverter controller for a refrigerator employing high efficiency surge protection according to claim 1, wherein the main circuit comprises:

the fuse is connected with the thermistor in series;

the bridge rectifier circuit is electrically connected with the thermistor and is externally connected with a variable frequency compressor of the refrigerator;

and the first capacitor is connected in parallel with the bridge rectifier circuit.

8. The inverter controller for refrigerators with high efficiency and surge protection as claimed in claim 1, wherein the control circuit employs voltage doubling triggering and mortgage maintaining control.

Technical Field

The invention relates to the technical field of refrigerating and freezing devices, in particular to a refrigerator frequency conversion controller adopting efficient anti-surge.

Background

The refrigerator is a refrigerating device for keeping constant low temperature, and is a civil product for keeping food or other articles in a constant low-temperature cold state. A refrigeration system of a conventional refrigerator is a compression refrigeration system in which a compressor is driven by a motor to rotate endlessly to compress a refrigerant as a power of a refrigeration cycle. The inverter compressor is a compressor with a constant rotating speed, and the rotating speed of the inverter compressor is adjusted within a certain range through the inverter controller of the refrigerator, so that the output energy of the inverter compressor can be changed.

The existing refrigerator frequency conversion controller generates instant surge current due to charging and discharging of an energy storage capacitor at the moment of electrifying, and the surge current can cause electric arcs generated by a connector, fuse fusing, breakdown of a rectifying circuit, impact on a power grid and the like. Therefore, the rectifier filter circuit of the traditional refrigerator frequency conversion controller is connected with the thermistor NTC with the negative temperature coefficient in series, and the surge current is effectively inhibited due to the action of the thermistor NTC at the moment of electrifying the refrigerator frequency conversion controller, so that the effects of protecting the circuit and preventing the impact on a power grid are achieved. After the refrigerator frequency conversion controller works normally, the thermistor NTC is a passive element and is connected in series on a circuit all the time to work, so that continuous useless loss of the frequency conversion plate refrigerator frequency conversion controller is increased, and the efficiency of the refrigerator frequency conversion controller is reduced.

Disclosure of Invention

In view of the above, it is necessary to provide a refrigerator inverter controller that employs efficient surge protection to solve the problem that the conventional refrigerator inverter controller will continuously increase useless loss.

A refrigerator frequency conversion controller adopting high-efficiency anti-surge comprises:

the main circuit is used for receiving an alternating current driving voltage and controlling the variable frequency compressor of the refrigerator to work according to the driving voltage, and the main circuit is provided with a thermistor used for inhibiting surge current; and

and the control circuit is connected with the thermistor in parallel and used for detecting the working state of the main circuit, and when the main circuit is started, the control circuit controls the thermistor to be in short circuit.

In one embodiment, the control circuit includes:

the base of the NPN transistor is used for receiving a feedback signal of the main circuit, and the collector of the NPN transistor is connected to a direct current supply voltage through a first resistor;

the base electrode of the PNP transistor is electrically connected with the collector electrode of the NPN transistor, and the emitter electrode of the PNP transistor is connected with a direct current supply voltage;

the relay is connected with the thermistor in parallel, and one electrode of the relay is electrically connected with the emitting electrode of the PNP transistor; and

and a second capacitor connected between the collector of the NPN transistor and the other electrode of the relay.

In one embodiment, the relay includes:

the normally open switch is connected with the thermistor in parallel; and

and the coil is used for controlling the normally open switch to be closed or opened.

In one embodiment, the control circuit further comprises:

the first diode is electrically connected between the two electrodes of the relay, and the cathode of the first diode is electrically connected to the collector electrode of the PNP transistor;

and the anode of the second diode is electrically connected to the anode of the first diode, and the cathode of the second diode is grounded.

In one embodiment, the control circuit further comprises:

the second resistor is electrically connected between the collector of the NPN transistor and the base of the PNP transistor;

and the third resistor is electrically connected to the base of the NPN transistor.

In one embodiment, the emitter of the NPN transistor is grounded.

In one embodiment, the main circuit comprises:

the fuse is connected with the thermistor in series;

the bridge rectifier circuit is electrically connected with the thermistor and is externally connected with a variable frequency compressor of the refrigerator;

and the first capacitor is connected in parallel with the bridge rectifier circuit.

In one embodiment, the control circuit adopts a voltage-doubling triggering and mortgage maintaining control mode.

In the embodiment of the invention, the efficient anti-surge frequency conversion controller of the refrigerator is adopted, and when the main circuit enters a stable state, the thermistor is directly short-circuited by using the control circuit, so that the loss of the whole drive circuit is reduced to be negligible.

Drawings

Fig. 1 is a schematic circuit structure diagram of a frequency conversion controller of a refrigerator employing high-efficiency surge protection according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a preferred embodiment of the present invention discloses a refrigerator frequency conversion controller 100 using high-efficiency anti-surge, wherein the refrigerator frequency conversion controller 100 includes a main circuit 110 and a control circuit 120. Wherein the content of the first and second substances,

the main circuit 110 is used for receiving an ac driving voltage and controlling the operation of the inverter compressor of the refrigerator according to the driving voltage, wherein the main circuit has a thermistor NTC for suppressing an inrush current.

Specifically, the main circuit 110 further includes a fuse FU, a bridge rectifier circuit BD, and a first capacitor E1, the fuse FU being connected in series with the thermistor NTC, the fuse FU being connected in series with the main circuit and receiving an ac driving voltage, the ac driving current passing through the fuse FU and the thermistor NTC,

the bridge rectifier circuit BD is electrically connected with the thermistor NTC and externally connected with a variable frequency compressor of the refrigerator, and the bridge rectifier circuit BD mainly converts the alternating current driving voltage into direct current driving voltage.

The first capacitor E1 is connected in parallel with the bridge rectifier circuit BD for further filtering the alternating current.

The control circuit 120 is connected in parallel with the thermistor NTC to detect the operating state of the main circuit, and when the main circuit is started, the control circuit controls the thermistor NTC to be short-circuited.

Specifically, the control circuit 120 includes an NPN transistor Q2, a PNP transistor Q1, a relay KV1, and a second capacitor C2.

More specifically, the base of the NPN transistor Q2 is configured to receive the feedback signal of the main circuit 110, and the collector of the NPN transistor Q2 is connected to the dc supply voltage + VDC through the first resistor R1. The emitter of the NPN transistor is grounded.

The base of the PNP transistor Q1 is electrically connected to the collector of the NPN transistor Q2, and the emitter of the PNP transistor Q1 is connected to a dc power supply voltage.

The relay KV1 is connected in parallel with the thermistor NTC, and one electrode of the relay KV1 is electrically connected with the emitter of the PNP transistor Q1. The relay KV1 comprises a normally open switch K1 and a coil KM, wherein the normally open switch K1 is connected with the thermistor NTC in parallel; the coil KM is used for controlling the normally open switch K1 to close or open. Specifically, when the coil KM is energized, the coil KM generates an electromagnetic force, and the normally open switch K1 is closed by the electromagnetic force, whereas when the coil KM is not energized, the electromagnetic force of the coil KM disappears, and the normally open switch K1 is in an open state by the absence of the electromagnetic force.

The second capacitor C2 is connected between the collector of the NPN transistor Q2 and the other electrode of the relay.

In this embodiment, the control circuit 120 further includes: a first diode D1 and a second diode D2.

The first diode D1 is electrically connected between two electrodes of the relay KV1, and the cathode of the first diode is electrically connected to the collector of the PNP transistor.

The anode of the second diode D2 is electrically connected to the anode of the first diode, and the cathode is grounded.

The control circuit 120 may further include a second resistor R2 and a third resistor R3.

The second resistor R2 is electrically connected between the collector of the NPN transistor and the base of the PNP transistor; the third resistor R3 is electrically connected to the base of the NPN transistor.

In the efficient anti-surge refrigerator frequency conversion controller in the embodiment of the invention, after the main circuit enters a stable state, the thermistor is directly short-circuited by using the control circuit, so that the loss of the whole drive circuit is reduced to be negligible.

The working process of the refrigerator frequency conversion controller 100 adopting the high-efficiency anti-surge function is as follows:

when the refrigerator frequency conversion controller 100 adopting the high-efficiency anti-surge mode is switched on, the control circuit 120 detects that the main circuit 110 is in a starting state, an RE L AY signal received by a signal input end of the control circuit 120 is in a low level, an NPN transistor Q2 is not switched on, a PNP transistor Q1 is not switched on, and a coil KM of a relay KV1 does not work, when the main circuit 110 is in a normal working state, namely in a non-starting state, when an RE L AY signal received by the signal input end of the control circuit 120 is in a high level, an NPN transistor Q2 is switched on, a PNP transistor Q1 is switched on, a coil KM of the relay KV1 starts working, a contact of a normally open switch K1 is closed, and a thermistor NTC is short-circuited, so that the loss of the thermistor.

In the present embodiment, the relay KV1 operates by a voltage doubler trigger and low voltage maintenance method, and the operating principle of the voltage doubler trigger and low voltage maintenance of the relay KV1 is explained as follows:

after the main circuit 110 of the efficient surge-proof refrigerator frequency conversion controller 100 is powered on, the control signal RE L AY received by the signal input end of the control circuit is at a low level, the NPN transistor Q2 is not powered on, and the power supply voltage + VDC charges the second capacitor C2 through the first resistor R1 until the voltage of the positive terminal of the second capacitor C2 is + VDC.

After the main circuit of the refrigerator frequency conversion controller 100 adopting the high-efficiency anti-surge is started, namely the thermistor NTC has finished suppressing the surge current, at this time, the relay KV1 is needed to be started, namely, the control signal RE L AY is switched to the high level, the NPN transistor Q2 is turned on, and before that, as can be seen from the above, the second capacitor C2 is fully charged and the positive terminal voltage is + VDC, the positive terminal of the second capacitor C2 is instantly grounded, because the energy storage function of the second capacitor cannot be changed, the positive terminal voltage equivalent to the second capacitor C2 is 0V, the negative terminal voltage is-VDC, and because of the function of the second diode D2, the current direction cannot be changed), at this time, the PNP transistor Q1 is turned on, the + VDC voltage is input into the KV1 through the PNP transistor Q1, namely, the voltage at one end of the coil KM of the relay KV1 is + VDC, the voltage at the other end is-VDC, the voltage equivalent to 2 times of 1, the voltage doubling triggering the KV-VDC-1 is ensured to be reliably turned on,

then, after the relay KV1 is triggered to turn on by voltage doubling, the second capacitor C2 is continuously discharged until the energy stored in state one is consumed. At the moment, the coil voltage at the two ends of the relay KV1 is only + VDC, and the low-voltage maintenance is carried out. The low voltage is maintained to further reduce the control circuit loss of the relay by half.

According to the traditional refrigerator frequency conversion controller, an NTC thermistor is connected in series with a power supply circuit, and after the refrigerator frequency conversion controller works stably, the NTC thermistor works continuously, so that heat loss exists all the time. From P_{Decrease in the thickness of the steel}＝I²R_NTC(where P loss refers to power loss, I refers to supply current, R_NTCThe current resistance value of the thermistor) can be known, and the efficiency of the variable frequency controller of the refrigerator is reduced by 2% due to the loss; after the refrigerator frequency conversion controller 100 according to the above embodiment of the present invention operates in a steady state, the relay KV1 is directly used to short-circuit the thermistor NTC, which is equivalent to short-circuiting R_NTCTo 0, there is no heat loss. Meanwhile, in order to further reduce the driving loss of the relay KV1, a control circuit based on a voltage-doubling triggering and low-voltage maintaining principle is introduced, so that the loss of the whole driving circuit is reduced to be negligible.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.