阅读说明：本技术 一种降低待机功耗的开关电源 (Switching power supply capable of reducing standby power consumption ) 是由 衡军军 吴新华 赵禹 于 2021-01-07 设计创作，主要内容包括：本发明提出了一种降低待机功耗的开关电源用于家电产品时满足待机功耗需求的方案,采用开关电源可控反馈的解决方案,具有实现方式简单,易于实现,可靠性高等优点,可实现开关电源在家电产品待机状态下降低功耗,并可以广泛用于其他电器产品。(The invention provides a scheme for reducing standby power consumption and meeting the standby power consumption requirement when a switching power supply is used for household appliances, adopts a controllable feedback solution of the switching power supply, has the advantages of simple implementation mode, easy implementation, high reliability and the like, can realize the reduction of the power consumption of the switching power supply in the standby state of the household appliances, and can be widely used for other electric appliances.)

1. A switching power supply for reducing standby power consumption, comprising:

the circuit comprises a voltage division resistor branch formed by connecting a plurality of resistors, wherein at least one resistor in the branch can be controlled to be accessed or not accessed to the voltage division resistor branch;

a control terminal, which can be high level or low level, wherein: when the electric appliance works normally, the control end is at a first level; when the electric appliance is in a standby state, the control end is as follows: a second level opposite to the first level;

a switching device connected to and controlled by the control terminal, wherein:

when the control terminal is at a first level, the switch device is in a first conducting state and enables the at least one resistor to be connected or not connected to the switch power supply;

when the control end is at a second level, the switch device is in a second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply, and the switch power supply outputs power lower than power consumption of the electric appliance during normal operation.

2. The switching power supply of claim 1, wherein:

the first level is a low level and the second level is a high level.

3. The switching power supply of claim 1, wherein:

the first level is high and the second level is low.

4. The switching power supply of claim 1, wherein:

the first conducting state is non-conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

5. The switching power supply of claim 1, wherein:

the second conducting state is conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

6. The switching power supply of claim 1, wherein:

the first conducting state is non-conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

7. The switching power supply of claim 1, wherein:

the second conducting state is conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

8. The switching power supply of claim 1, wherein:

the switching power supply also comprises an LD0 linear power supply branch, and the output current of the LD0 linear power supply branch is unchanged.

9. The switching power supply of claim 1, wherein:

when the control terminal is at the second level, the switch device is in the second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply,

the switching power supply realizes the following by outputting a voltage lower than the voltage of the electric appliance during normal operation: at the moment, the output power consumption of the switching power supply is lower than that of the electric appliance in normal operation.

10. The method of claim 1, wherein:

the switching power supply is of a flyback topology structure, or of a forward topology structure, or of other topology structures.

Technical Field

The invention relates to the field of switching power supplies, in particular to a switching power supply capable of reducing standby power consumption.

Background

Along with the development of society, the use amount of human energy is larger and larger, the need of energy-saving technology is more and more urgent, and a series of energy standards are issued by the nation. The switching power supply is widely applied to the field of household appliances due to the advantages of high efficiency, low power consumption and the like, but the household appliances have standby requirements, and the latest standards issued by the nation require that the power consumption of the household appliances is less than 0.5W and the like during standby. However, the switching power supply has a disadvantage of low efficiency under light load, which results in that many household electrical appliances cannot meet related requirements.

Taking a flyback switching power supply as an example, the flyback switching power supply is widely applied in the field of household appliances with the advantages of high efficiency, high power density and the like, but a fixed feedback circuit adopted by a flyback switching power supply used in a traditional household appliance product is in a light load state when in standby, and at the moment, the switching power supply has low conversion efficiency and is difficult to meet the index of standby power consumption.

Disclosure of Invention

In view of the above, the present invention provides a switching power supply for reducing standby power consumption, including:

the circuit comprises a voltage division resistor branch formed by connecting a plurality of resistors, wherein at least one resistor in the branch can be controlled to be accessed or not accessed to the voltage division resistor branch;

a control terminal, which can be high level or low level, wherein: when the electric appliance works normally, the control end is at a first level; when the electric appliance is in a standby state, the control end is as follows: a second level opposite to the first level;

a switching device connected to and controlled by the control terminal, wherein:

when the control terminal is at a first level, the switch device is in a first conducting state and enables the at least one resistor to be connected or not connected to the switch power supply;

when the control end is at a second level, the switch device is in a second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply, and the switch power supply outputs power lower than power consumption of the electric appliance during normal operation.

Preferably, the first and second liquid crystal materials are,

the first level is a low level and the second level is a high level.

Preferably, the first and second liquid crystal materials are,

the first level is high and the second level is low.

Preferably, the first and second liquid crystal materials are,

the first conducting state is non-conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

Preferably, the first and second liquid crystal materials are,

the second conducting state is conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

Preferably, the first and second liquid crystal materials are,

the first conducting state is non-conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

Preferably, the first and second liquid crystal materials are,

the second conducting state is conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

Preferably, the first and second liquid crystal materials are,

the switching power supply also comprises an LD0 linear power supply branch, and the output current of the LD0 linear power supply branch is unchanged.

Preferably, the first and second liquid crystal materials are,

when the control terminal is at the second level, the switch device is in the second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply,

the switching power supply realizes the following by outputting a voltage lower than the voltage of the electric appliance during normal operation: at the moment, the output power consumption of the switching power supply is lower than that of the electric appliance in normal operation.

Preferably, the first and second liquid crystal materials are,

the switching power supply is of a flyback topology structure, or of a forward topology structure, or of other topology structures.

The invention has the following characteristics:

the invention provides a scheme for meeting the standby power consumption requirement when a switching power supply is used for household appliances, adopts the solution of controllable feedback of the switching power supply, has the advantages of simple implementation mode, easy implementation, high reliability and the like, can realize the reduction of the power consumption of the switching power supply in the standby state of the household appliances, and can be widely used for other electric appliances.

Drawings

FIG. 1 illustrates an overall circuit of a switching power supply in one embodiment;

fig. 2 illustrates a control terminal and a partial circuit such as a voltage dividing branch circuit, which are based on the working state of an electrical appliance and adopt a feedback control concept in the switching power supply circuit shown in fig. 1;

figure 3 illustrates a flow diagram in one embodiment.

Drawing notes: u23-optocoupler, Q18-triode, VR2-TL431 voltage stabilizer and IO-control end signal.

Detailed Description

Each embodiment in this specification is described in a progressive manner, emphasis is placed on differences from other embodiments, and the same and similar parts among various embodiments can be referred to each other.

In one embodiment, the present invention discloses a switching power supply for reducing standby power consumption, comprising:

the circuit comprises a voltage division resistor branch formed by connecting a plurality of resistors, wherein at least one resistor in the branch can be controlled to be accessed or not accessed to the voltage division resistor branch;

a control terminal, which can be high level or low level, wherein: when the electric appliance works normally, the control end is at a first level; when the electric appliance is in a standby state, the control end is as follows: a second level opposite to the first level;

a switching device connected to and controlled by the control terminal, wherein:

when the control terminal is at a first level, the switch device is in a first conducting state and enables the at least one resistor to be connected or not connected to the switch power supply;

when the control end is at a second level, the switch device is in a second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply, and the switch power supply outputs power lower than power consumption of the electric appliance during normal operation.

The invention can find out that the invention innovatively provides a mode of adopting an adjustable feedback circuit to reduce the power loss of the household appliance in standby. The principle of the method is that the output of the switching power supply is reduced when the switching power supply is in a light load state through adjustable feedback, so that the purpose of reducing the power consumption of the switching power supply in the light load state is achieved.

In another embodiment of the present invention, the substrate is,

the first level is a low level and the second level is a high level.

Based on a completely opposite idea, then, in another embodiment,

the first level is high and the second level is low.

In another embodiment of the present invention, the substrate is,

the first conducting state is non-conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

In another embodiment of the present invention, the substrate is,

the second conducting state is conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

In another embodiment of the present invention, the substrate is,

the first conducting state is non-conducting, and at this time, the at least one resistor is not connected to the voltage-dividing resistor branch and does not flow current.

In another embodiment of the present invention, the substrate is,

the second conducting state is conducting, and at this time, the at least one resistor is connected to the voltage-dividing resistor branch and flows through the current.

In another embodiment of the present invention, the substrate is,

the switching power supply also comprises an LD0 linear power supply branch, and the output current of the LD0 linear power supply branch is unchanged.

In another embodiment, as shown in figure 3,

when the control terminal is at the second level, the switch device is in the second conducting state and enables the at least one resistor to be correspondingly not connected or connected to the switch power supply,

the switching power supply realizes the following by outputting a voltage lower than the voltage of the electric appliance during normal operation: at the moment, the output power consumption of the switching power supply is lower than that of the electric appliance in normal operation.

Taking a household appliance as an example, a general power supply solution is as follows: the output voltage U, U of the switch power supply can be directly used for supplying power to loads such as a relay, a stepping motor and a display circuit, the output voltage U1 is output after the U is converted through the LDO, and the U1 is used for supplying power to a chip, an operational amplifier and the like. When the household appliance product normally works, the switching power supply normally outputs a voltage U, when the household appliance product is in standby, because a stepping motor, a relay, a display circuit and the like do not need to be electrified, the switching power supply output voltage U2 can be enabled by adjusting controllable feedback at the moment, the voltage of U2 is lower than U1, the current I needed when the LDO output voltage U1 supplies power to a load is kept constant, when the switching power supply output voltage U is, the power consumption is P1 ═ U ═ I, when the switching power supply output voltage U2 can be fed back by adjusting, the power consumption is P1 ═ U2 ═ I at the moment, and compared with the fixed feedback circuit switching power supply, the standby power consumption percentage of the household appliance product which can be saved is P/P1 ═ U2/U1.

With reference to fig. 1 and fig. 2, it can be understood that the specific implementation scheme of the switching power supply with low power consumption provided by the present invention is as follows: the output voltage of the switching power supply is adjusted by adjusting the voltage dividing resistor of the feedback loop. In fig. 1, IO represents a feedback control signal of the switching power supply, Q18 is a control transistor, when the household appliance normally operates, IO is at a low level, Q18 is not turned on, and according to the feedback voltage division principle of the flyback switching power supply, the output voltage of the switching power supply is normal U1 ═ Vref (R45+ R32+ R35)/R45. When the household appliance is in a standby state, IO is in a high level state at the time, the transistor Q18 is turned on, the resistors R35 and R45 divide voltage, and according to the flyback switching power supply feedback voltage division principle, the output voltage is U2 ═ Vref (R45+ R35)/R45 at the time. Obviously, U2< U1, and the current of the LDO linear power supply is unchanged, so the standby power consumption is reduced by a percentage of U2/U1.

In another embodiment of the present invention, the substrate is,

the switching power supply is of a flyback topology structure, or of a forward topology structure, or of other topology structures.

As described above with reference to the switching device, the transistor Q18 in the feedback regulation circuit according to the present invention may be replaced with a switching device such as a field effect transistor.

As further shown in fig. 2, for this specific local circuit, the voltage regulator TL431 may be replaced by a voltage regulator diode or other device with a voltage regulation function.

It can be understood that the invention has the following features:

A. the problem of the too big power consumption of household electrical appliances standby is solved.

B. The problem of conversion efficiency is low when the switching power supply is lightly loaded is solved.

C. The problem of energy loss when household electrical appliances are standby is solved.

It is also this that makes the invention:

1. the output of the switching power supply is controllable by changing the feedback mode of the switching power supply.

2. The problem of low conversion efficiency of the switching power supply under light load is solved by controlling the feedback of the switching power supply.

3. The problem of large power consumption of household appliances in standby is solved by controlling the feedback of the switching power supply.

4. The energy-saving effect is realized through a simple and effective mode.

In summary, the present invention provides a solution for satisfying the standby power consumption requirement when the switching power supply is used in a household electrical appliance, and the solution using the controllable feedback of the switching power supply has the advantages of simple implementation manner, easy implementation, high reliability, and the like, and can realize the reduction of the power consumption of the switching power supply in the standby state of the household electrical appliance, and can be widely used in other electrical appliances.

It should be noted that the implementation form of the switching power supply is very general, but it follows that the concept of reducing standby power consumption of the present invention is not prevented from being applied to other switching power supplies even though it is different from the specific topology shown in fig. 1, where the present invention implements different levels of the control terminal based on the operating state and further affects different resistances of the voltage dividing branches, thereby forming different high and low power outputs. This is clear only by knowing the principle of the switching power supply and the voltage dividing branch in the art.

The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.