WO2023173986A1

WO2023173986A1 - Power supply circuit

Info

Publication number: WO2023173986A1
Application number: PCT/CN2023/076134
Authority: WO
Inventors: 刘伟; 吕杨; 高秋英
Original assignee: 重庆海尔滚筒洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2022-03-15
Filing date: 2023-02-15
Publication date: 2023-09-21
Also published as: CN114583813A

Abstract

Provided in the present application is a power supply circuit, comprising: a controllable power supply, a first control unit and a second control unit. The controllable power supply is used for supplying power to an electrical unit under the control of a first startup signal and a second startup signal. The first control unit is used for generating the first startup signal under the control of a first control signal, generating the second startup signal under the control of a second control signal, and generating a shutdown signal under the control of a third control signal. The second control unit is used for generating the first control signal when the electrical unit outputs a power supply startup signal, and is also used for sequentially generating the second control signal and the third control signal when the electrical unit outputs a power supply shutdown signal. After the electrical unit outputs the power supply shutdown signal, the power supply circuit still generates the second startup signal to delay a time point at which the controllable power supply stops supplying power to the electrical unit, so as to ensure operation parameter storage of the electrical unit, thereby improving continuity of operation processes of a household appliance before and after a power failure of a power supply circuit.

Description

power circuit

This application claims priority to the Chinese patent application filed with the China Patent Office on March 15, 2022, with the application number 202210253315.1 and the application name "Power Circuit", the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of circuit technology, and in particular, to a power supply circuit.

Background technique

A power circuit refers to a circuit that provides electrical energy to the power-consuming units in the circuit. In household appliances, a connected power circuit ensures the normal operation of household appliances according to preset operating parameters.

During the use of household appliances, a sudden power outage of the power circuit causes the household appliances to stop working before completing the preset working process. After being powered on again, they cannot continue to work according to the operating parameters corresponding to the power outage moment, resulting in the continuous operation of the household appliances. Sex is low.

Therefore, how to improve the continuity of the operation process of household appliances before and after the power circuit is cut off has become an urgent problem to be solved.

Contents of the invention

The present application provides a power circuit to solve the technical problem of low continuity of the operation process of household appliances before and after the power circuit is cut off.

This application provides a power circuit, including:

A controllable power supply is provided with an output end and a control end, and its output end is used to connect to the power supply end of the power-consuming unit. It is used to supply power to the power-consuming unit under the control of the first start-up signal, and under the control of the second start-up signal. Supply power to electrical units under control;

The first control unit is provided with a first end and a control end. The first end is connected to the control end of the controllable power supply. It is used to generate a first turn-on signal under the control of the first control signal. When the second control signal Generate a second opening signal under the control of the third control signal, and generate a closing signal under the control of the third control signal;

The second control unit has a first end and a second end. The first end is used to connect the locking end of the power unit, and the second end is connected to the control end of the first control unit. It is used to connect the power unit to the power unit. The first control signal is generated when the power start signal is output, and is also used to output the power shutdown signal at the power consumption unit. The second control signal and the third control signal are generated sequentially; wherein, the power off signal is generated when the voltage generated by the power-consuming unit at its lock terminal is less than the threshold voltage.

Optionally, the circuit also includes:

The trigger unit is provided with an output terminal, and the output terminal is used to connect with the trigger terminal of the power unit, and is used to receive the switch signal and generate the trigger signal according to the switch signal;

Among them, the power unit is used to generate a power start signal based on the trigger signal when the locally stored flag bit is a power-on signal;

The power consumption unit is used to generate a power shutdown signal based on the trigger signal when the locally stored flag bit is a shutdown signal.

Optionally, the circuit also includes:

The switch unit has a first end connected to the input end of the trigger unit and is used to generate a switch signal.

Optionally, the circuit also includes:

a pre-conduction unit, which is connected to the second end of the first control unit and the first end of the switch unit, and is used to control the first control unit to output a third turn-on signal when receiving the switch signal;

The controllable power supply is used to supply power to the power-consuming unit under the control of the third start signal.

Optionally, the circuit also includes:

The power-on unit has a first end connected to the control end of the controllable power supply and is used to generate a fourth start-up signal when the controllable power supply is initially powered on;

The controllable power supply is used to supply power to the electrical unit under the control of the fourth start signal.

Optionally, controllable power sources include:

The first switch tube is provided with a control end, a first end and a second end, its control end is connected to the first end of the first control unit, and its first end is connected to the power supply;

The voltage conversion unit has an enabling end connected to the second end of the first switch tube and an output end connected to the power supply end of the power unit;

or

The input end of the voltage conversion unit is connected to the second end of the first switch tube, and the output end is connected to the power supply end of the power consumption unit.

Optionally, the first control unit includes:

The first resistor has a first end connected to the power supply and a second end connected to the control end of the controllable power supply;

a seventh resistor, the first end of which is connected to the second end of the first resistor, and the second end of which is connected to the pre-conduction unit;

The second switch tube has a first end connected to the second end of the seventh resistor and the pre-conduction unit, a second end connected to ground, and a control end connected to the second end of the second control unit.

Optionally, the second control unit includes:

a sixth resistor, the first end of which is connected to the second end of the first control unit and then grounded;

a second resistor, the first end of which is connected to the second end of the sixth resistor and the control end of the first control unit;

The first end of the ninth resistor is connected to the second end of the second resistor, and the second end is connected to the locking end of the power unit;

The first end of the ninth capacitor is connected to the second end of the second resistor and the first end of the ninth resistor, and its second end is connected to ground.

Optionally, the trigger unit includes:

A fourteenth resistor, the first end of which is connected to the output end of the controllable power supply;

The first end of the fifteenth resistor is connected to the second end of the fourteenth resistor, and the second end is connected to the trigger end of the power unit;

The first end of the eleventh capacitor is connected to the second end of the fifteenth resistor and the trigger end of the power unit, and its second end is grounded;

The second diode has a first end connected to the first end of the switch unit, and a second end connected to the second end of the fourteenth resistor and the first end of the fifteenth resistor.

Optionally, the power-on unit includes:

a fourth resistor, the first end of which is connected to the control end of the controllable power supply and the first end of the first control unit;

The first end of the fifth capacitor is connected to the second end of the fourth resistor, and the second end is connected to ground.

This application provides a power supply circuit, including: a controllable power supply, a first control unit and a second control unit, wherein the controllable power supply is provided with an output end and a control end, and the output end is used to connect the power supply end of the power consumption unit. It is used to supply power to the power-consuming unit under the control of the first start-up signal, and to supply power to the power-consuming unit under the control of the second start-up signal; the first control unit is provided with a first end and a control end, and its first end is connected to The control end of the controllable power supply is connected, which is used to generate a first turn-on signal under the control of a first control signal, a second turn-on signal under the control of a second control signal, and a turn-off signal under the control of a third control signal. signal; the second control unit is provided with a first end and a second end, which The first end is used to connect the locking end of the power-using unit, and the second end is connected to the control end of the first control unit. It is used to generate a first control signal when the power-using unit outputs a power start signal, and is also used to generate a first control signal when the power-using unit outputs a power start signal. When the unit outputs the power-off signal, it generates the second control signal and the third control signal in sequence; among them, the power-off signal is generated when the voltage generated by the power-consuming unit at its lock terminal is less than the threshold voltage, and the power circuit outputs the power-using unit through the power-consuming unit. After the power off signal, the second control unit is still used to output the second control signal, so that the first control unit generates the second on signal, thereby extending the time point at which the controllable power supply stops supplying power to the power unit to provide storage operation of the power unit. parameters of time and electric energy, thereby solving the technical problem of low continuity of the operation process of household appliances before and after the power circuit is cut off.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Figure 1 is an application scenario diagram of a power circuit provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a power circuit provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of a power circuit provided by another embodiment of the present application;

FIG. 4 is a schematic structural diagram of a power supply circuit provided by another embodiment of the present application.

Through the above-mentioned drawings, clear embodiments of the present application have been shown, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present application's concepts in any way, but are intended to illustrate the application's concepts for those skilled in the art with reference to specific embodiments.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the appended claims.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, elements qualified by the statement "includes a..." are not excluded from including There are other identical elements in the process, method, article or device of this element. In addition, the components, features and elements with the same name in different embodiments of the present application may have the same meaning or may have different meanings, and their specific meanings need to be Determination is based on its explanation in this specific embodiment or further combined with the context in this specific embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this article, the first information may also be called second information, and similarly, the second information may also be called first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining." Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprising" and "including" indicate the presence of features, steps, operations, elements, components, items, categories, and/or groups, but do not exclude one or more other features, steps, operations, elements, The presence, occurrence, or addition of components, items, categories, and/or groups. The terms "or", "and/or", "including at least one of the following", etc. used in this application may be interpreted as inclusive or mean any one or any combination. For example, "including at least one of the following: A, B, C" means "any of the following: A; B; C; A and B; A and C; B and C; A and B and C"; another example is, " A, B or C" or "A, B and/or C" means "any of the following: A; B; C; A and B; A and C; B and C; A and B and C". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

It should be understood that although each step in the flow chart in the embodiment of the present application is shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least some of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and their execution order is not necessarily sequential. may be performed in turn or alternately with other steps or sub-steps of other steps or at least part of stages.

Depending on the context, the words "if" or "if" as used herein may be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" May be interpreted as "when determined" or "in response to determination" or "when (stated condition or event) is detected" or "in response to detection (stated condition or event)."

It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

In view of the above technical problems, embodiments of the present application provide a power circuit, aiming to solve the problem of improving the continuity of the operation process of household appliances before and after the power circuit is powered off. The technical concept of this application is to set up a unit with an energy storage function in the power circuit to extend the time the household appliances stop running after receiving a power-off signal during operation, so as to ensure that the control unit in the household appliances The operating parameters before power failure or shutdown are stored so that the household appliances can continue to operate according to the stored parameters after powering on or turning on, thereby improving the continuity of the operation process of the household appliances before and after the power circuit is cut off.

Figure 1 is an application scenario diagram of a power supply circuit provided by an embodiment of the present application. As shown in Figure 1, the household appliance 10 includes a power supply circuit 11 and a power consumption unit 12. The power supply circuit 11 includes a controllable power supply 111 and a power supply control unit 112. The power consumption unit 12 includes a control unit 121 and an execution unit 122 . Among them, the power supply circuit 11 is connected to the power consumption unit 12. In addition, there is an external power supply 13 outside the household appliance 10, and the power supply circuit 11 is connected to the external power supply 13. In the power supply circuit 11, the controllable power supply 111 and the power supply control unit 112 are connected. In the power consumption unit 12, the control unit 121 and the execution unit 122 are connected. More specifically, the power supply circuit 11 is used to provide the electric energy required during the operation of the power supply unit 12 and the power supply control unit 112. The power supply control unit 112 is used to control the on and off states of the controllable power supply 111. The control unit 121 uses In addition to controlling the operating state of the power supply control unit 112, it is also used to control the operating state of the execution unit 122.

When the household appliance 10 starts to operate, under the control of the control unit 121, the power supply control unit 112 generates a power on signal and transmits the power on signal to the controllable power supply 111 to provide conduction conditions for the controllable power supply 111. , the controllable power supply 111 is turned on, and the electric energy from the external power supply 13 can pass through The control power supply 111 is transmitted to the power consumption unit 12, that is, the power circuit 11 provides power to the power consumption unit 12, and the control unit 121 controls the execution unit 122 to perform corresponding operations within a preset time range according to the preset control program. During the operation of the household appliance 10, in one embodiment, the external power supply 13 and the controllable power supply 111 are disconnected, and the voltage that the power circuit 11 can provide gradually decreases, that is, the electrical energy available to the household appliance 10 gradually decreases. The power supply control unit 112 uses the built-in energy storage device to maintain that the power supply control unit 112 can still generate a power supply conduction signal to the controllable power supply 111 within a preset time range, so that the controllable power supply 111 can still maintain the conduction state and use electricity. The unit 12 can still obtain electric energy until the electric energy stored in the energy storage device in the power supply control unit 112 is consumed to the point where the power supply control unit 112 cannot generate the above-mentioned power on signal. When the voltage provided by the external power supply 13 for the power circuit 11 gradually decreases, the power supply unit 12 can obtain the power transmitted from the controllable power supply 111 due to the energy storage device in the power supply control unit 112. However, the control unit 121 can still detect that the input voltage and electric energy of the power consumption unit 12 continue to decrease. When the control unit 121 obtains continuously reduced power until the controllable power supply 111 stops supplying power, the control unit 121 stores the operating parameters of the execution unit 122 locally and updates the stored flag bits to the preset interrupt value.

In another embodiment, during the operation of the power-consuming unit 12, the connection status between the external power supply 13 and the controllable power supply 111 is normal, the control unit 121 receives a power-off signal, and the power-consuming unit 12 transmits the signal to the power supply. The circuit 11 controls the power supply circuit to perform the power-off operation, that is, the power supply control unit 112 uses the stored electric energy to delay the time point at which the above-mentioned power-off operation is performed, so as to ensure that the control unit 121 stores the operating parameters of the execution unit 122 and sets the stored flags. The bit is updated to the preset interrupt value.

After the household appliance 10 stops running, if the external power supply 13 provides power to the household appliance 10 again, the power supply control unit 112 generates a power on signal again and transmits the signal to the controllable power supply 111 so that the controllable power supply 111 supplies power to the user. Unit 12 provides electrical energy. After the power consumption unit 12 obtains the electric energy, it queries the flag bit stored locally. If the flag bit is a preset interrupt value, the locally stored operating parameters are obtained, the state of the execution unit 122 is adjusted according to the operating parameters, and the execution unit 122 is controlled to continue running from the state where the last power outage ended.

When the execution unit 122 in the household appliance 10 completes all operating operations according to the operating program in the control unit 121 and performs a normal power outage, the control unit 121 updates the locally stored flag bit to a default value, where the default value is different at the above default interrupt value. If the household appliance 10 is powered on again, the control unit 121 will query the locally stored flag bit after obtaining the power. is the default value, no other operations are performed until the control unit 121 receives the input operating instruction.

Figure 2 is a schematic structural diagram of a power supply circuit provided by an embodiment of the present application. As shown in Figure 2, the power supply circuit 20 includes a controllable power supply 21, a first control unit 22 and a second control unit 23. The controllable power supply 21 is provided with There is an output terminal 211 and a control terminal 212. The first control unit 22 is provided with a first terminal 221 and a control terminal 222, and the second control unit 23 is provided with a first terminal 231 and a second terminal 232. The output end 211 of the controllable unit 21 is connected to the power unit 24. More specifically, the power unit 24 includes a power supply end 241 and a locking end 242. The output end 211 of the controllable unit 21 is connected to the power supply end 241 of the power unit 24. , the locking end 242 of the power unit 24 is connected to the first end 231 of the second control unit 23 , the second end 232 of the second control unit 23 is connected to the control end 222 of the first control unit 22 , and the The first terminal 221 is connected to the control terminal 212 of the controllable power supply 21 .

After the first end 231 of the second control unit 23 receives the power start signal generated by the power unit 24 and transmitted from the locking end 242 of the power unit 24, the second control unit 23 generates a first power start signal based on the power start signal. control signal, and transmits the first control signal from the second terminal 232 of the second control unit 23 to the control terminal 222 of the first control unit 22. The first control unit 222 generates a first turn-on function according to the received first control signal. signal, and transmits the first turn-on signal from its first end 221 to the control end 212 of the controllable power supply 21. The controllable power supply 21 supplies power to the power-consuming unit 24 under the control of the above-mentioned first turn-on signal.

During the power supply process of the power circuit 20 and the operation of the power unit 24, if the power supply voltage generated by the locking terminal 242 of the power unit 24 is less than the threshold voltage, the power unit 24 generates a power off signal and sends the power off signal. It is transmitted from the locking end 242 of the power consumption unit 24 to the first end 231 of the second control unit 23 . The second control unit 23 sequentially generates a second control signal and a third control signal according to the power off signal, and transmits the second control signal and the third control signal from its second end 232 to the control unit of the first control unit 22 End 222. Among them, the second control signal is used to still cause the controllable power supply 21 to provide electric energy to the power unit 24 under the instruction of the power off signal, so as to use the control unit in the power unit 24 to store the flag bit in the local memory according to the power outage condition. and operating parameters. That is, if the above-mentioned power-off signal is a shutdown signal received after the power unit 24 completes all operating operations, then the power-off signal is used to terminate the operation process of the household appliance normally, and its updated flag bit is the default corresponding to normal power outage. value; if the above-mentioned power-off signal is a signal received during the operation of the power-consuming unit 24, the above-mentioned second control signal generated according to the power-off signal is used to delay the controllable power supply 21 to stop supplying power to the power-consuming unit 24. time, The control unit in the electrical unit 24 is used to store the operating parameters of the execution unit and update the flag bit stored locally, where the flag bit is a default interrupt value. The first control unit 22 also generates a shutdown signal according to the acquired third control signal. The control terminal 212 of the controllable power supply 21 will no longer receive the startup signal, and the controllable power supply 21 stops supplying power to the power consumption unit 24 .

In the above technical solution, during the power-off process of the household appliance, the power circuit generates the opening signal and the closing signal through the second control unit and the first control unit in sequence according to the signal generated by the power-consuming unit, and the controllable power supply is maintained according to the above-mentioned opening signal. The state of continuous power supply to the power-consuming unit, so that the power-consuming unit can store the current operating parameters and/or flags, so that when the household appliances obtain power again, they can perform corresponding operations based on the flags and operating parameters, thus improving the power supply Continuity of the operation of household appliances before and after a circuit power outage.

Figure 3 is a schematic structural diagram of a power circuit provided by another embodiment of the present application. As shown in Figure 3, the power circuit 20, based on the corresponding embodiment of Figure 2, also includes a trigger unit 25, a switch unit 26, a pre-conduction unit unit 27 and power-on unit 28, wherein the trigger unit 25 includes an input terminal 251 and an output terminal 252, the switch unit 26 includes a first terminal 261, the power-on unit 28 includes a first terminal 281, and in addition, the first control unit 22 also includes The second end 223 , the power unit 24 also includes a trigger end 243 . The first end 261 of the switch unit 26 is connected to the input end 251 of the trigger unit 25 , the output end 252 of the trigger unit 25 is connected to the trigger end 243 of the power unit 24 , and the locking end 242 of the power unit 24 is connected to the second control unit 23 The first end 231 is connected, the second end 232 of the second control unit 23 is connected to the control end 222 of the first control unit 22, the first end 231 of the first control unit 22 is connected to the control end 212 of the controllable power supply 21, The output terminal 211 of the controllable unit 21 is connected to the power supply terminal 241 of the power consumption unit 24 . In addition, the first end 261 of the switch unit 26 is also connected to the pre-conduction unit 27, the pre-conduction unit 27 is connected to the second end 223 of the first control unit 22, and the control end 212 of the controllable power supply 21 is also connected to the power-on unit. The first end of 28 is connected to 281.

When the household appliance starts to work and the controllable power supply 21 receives the power-on signal from the external power supply unit, the power-on unit 28 also receives the power-on signal. The power-on unit 28 generates a fourth start-up signal according to the received power-on signal and outputs it from its first terminal 281 to the control terminal 212 of the controllable power supply 21 . The controllable unit 21 starts to supply power from its output end 211 to the power supply end 241 of the power consumption unit 24 according to the fourth start signal it receives. After receiving the power supply signal, the power supply terminal 241 of the power consumption unit 24 first queries the flag bit stored locally. If the flag bit is the preset interrupt value corresponding to the power outage, it directly reads the operating parameters stored locally. and from its locking end 242 to the second control unit The unit 23 outputs a power start signal so that it can generate a first control signal according to the signal to control the first control unit 22 to generate a first start signal and send the signal to the controllable power supply 21 to ensure that the controllable power supply 21 is not in use. It is necessary to continuously supply power to the power unit 24 under the triggering of the switch signal of the switch unit 26, so that the power unit 24 can continue to perform operations in the state corresponding to the operating parameters until all operating operations are completed; if the flag is closed normally When the flag bit corresponds to the default value, after the above-mentioned power-on unit 28 generates and sends the fourth turn-on signal of the preset duration to the controllable power supply 21, it stops supplying power to the power-consuming unit 24, that is, within the time range corresponding to the preset duration. Within this time range, the controllable power supply 21 supplies power to the power-consuming unit 24. Beyond this time range, the controllable power supply 21 stops supplying power to prevent the power-consuming unit 24 from continuing to consume power during standby, thereby improving the utilization rate of electric energy by household appliances and achieving energy saving. .

During the power-on process of the household appliance, when the switch unit 26 receives the switch trigger signal, it generates a switch signal. On the one hand, the switch signal is transmitted to the pre-conduction unit 27 through its first end 261 and passes through the pre-conduction unit 27 is transmitted to the second end 223 of the first control unit 22, so that the first control unit 22 generates a third control signal, and sends the signal from its first end 221 to the control end 212 of the controllable power supply 21, so that the The controllable power supply 21 maintains its power supply state during the process of supplying power to the power consumption unit 24, or resumes power supply when the controllable power supply 21 stops supplying power to the power consumption unit 24, wherein the controllable power supply 21 stops supplying power to the power consumption unit 24. This is because after receiving the fourth turn-on signal from the power-on unit 28, the power supply is supplied to the power-consuming unit 24 for a preset period of time and then the power supply is stopped. On the other hand, the switch signal is transmitted to the input terminal 251 of the trigger unit 25 through the first terminal 261 of the switch unit 26. The trigger unit 25 generates a trigger signal according to the received switch signal and outputs the trigger signal from the trigger unit 25. The terminal 252 is output to the trigger terminal 243 of the power consumption unit 24 .

The power consumption unit 24 updates the locally stored flag bit corresponding to the switch trigger signal according to the trigger signal, that is, adjusts the flag bit to the flag bit corresponding to the power-on signal. The power-using unit 24 generates a power-on signal according to the flag bit, and transmits the power-on signal to the first terminal 231 of the second control unit 23 through the locking terminal 242 of the power-consuming unit 24 . The second control unit 22 generates a first control signal according to the obtained power start signal, and sends the first control signal from its second terminal 232 to the control terminal 222 of the first control unit 22 . The first control unit 22 generates a first turn-on signal according to the received first control signal, and sends the first turn-on signal from its first end 221 to the control end 212 of the controllable power supply 21 . The controllable unit 21 starts and continues to supply power to the power-consuming unit 24 from its output end 211 according to the received first start-up signal.

When the switch unit 26 receives the switch trigger signal again, it generates the switch signal again, and transmits the switch signal to the input terminal 251 of the trigger unit 25 through the first end 261 of the switch unit 26. The trigger unit 25 responds to the received switch signal. The signal generates a trigger signal, and the trigger signal is output from the output terminal 252 of the trigger unit 25 to the trigger terminal 243 of the power consumption unit 24 . The power consumption unit 24 updates the locally stored flag bit corresponding to the switch trigger signal according to the trigger signal, that is, adjusts the flag bit to the flag bit corresponding to the shutdown signal. The power-consuming unit 24 generates a power-off signal according to the flag bit, and transmits the power-off signal to the first terminal 231 of the second control unit 23 through the locking terminal 242 of the power-consuming unit 24 . The second control unit 22 sequentially generates the second control signal and the third control signal according to the obtained power off signal, and after the above two signals are generated, the second control unit 22 sequentially passes the control signal sent from its second end 232 to the first control unit 22 End 222. The power-off signal indicates that the power-consuming unit 24 generates the voltage when the voltage generated by the locking terminal 242 is less than the threshold voltage. When the first control unit 22 receives the second control signal, it generates a second turn-on signal according to the second control signal, and transmits the second turn-on signal to the control end 212 of the controllable power supply 21 through its first end 221 . Among them, the second turn-on signal is used to maintain the controllable power supply 21 to provide electric energy to the power consumption unit 24 after the household appliance receives the shutdown instruction. This signal is generated by the energy storage device in the second control unit 23 providing electric energy to continue to generate. To delay the time when the controllable power supply 21 stops supplying power to the power consumption unit 24. When the first control unit 22 receives the third control signal, a shutdown signal is generated according to the third control signal, and the signal is used to disconnect the electrical signal transmission between the first control unit 22 and the controllable unit 21 . After the control terminal 212 of the controllable power supply 21 cannot receive the control signal, it begins to receive the signal generated by the power-on unit 28 based on the electric energy stored therein, so as to maintain that it can still supply power to the power-consuming unit 24 through its output terminal 211 until the power-on unit 28 is powered on. The electric energy stored in the electric unit 28 is insufficient to support the controllable power supply 21 to continue supplying power, and the electric unit 24 stops operating. Among them, the electric energy stored in the power-on unit 28 is also used to delay the time when the controllable power supply 21 stops supplying power to the power supply 24. The power-on unit 28 and the second control unit 23 use the stored electric energy to delay the stop of the controllable unit 21. During the power supply time point, the power-consuming unit 24 updates its locally stored flag bit according to its operating status, and stores the operating parameters according to the flag bit, so as to ensure that the power-consuming unit 24 follows the next time it receives a power-on signal. The stored operating parameters and flags continue to run. During the process of the controllable power supply 21 supplying power to the power consumption unit 24, the voltage signal received by the power supply terminal 241 of the power consumption unit 24 remains unchanged.

When the household appliance is running, the switch unit 26 does not receive the switch trigger signal, but the voltage provided by the controllable power supply 21 to the power supply terminal 241 of the power consumption unit 24 through its output terminal 211 continues. When the voltage decreases, the power-consuming unit 24 starts to update the locally stored flag bit to a preset interrupt value according to the detected voltage change, and stores the operating parameters of the power-consuming unit 24 . As the input voltage of the power unit 24 continues to decrease, the voltage generated by its locking terminal 242 also decreases. When the voltage is less than the threshold voltage, a power off signal is generated and the signal is transmitted to the second through its locking terminal 242. The first end 231 of the control unit 23 . Similar to the above situation, the second control unit 23 sequentially generates the second control signal and the third control signal according to the received power off signal, and transmits the signals to the first control unit 22 so that the first control unit 22 sequentially generates the third control signal. 2. On signal and off signal, and transmit the two signals to the control terminal 212 of the controllable power supply 21 in sequence. Since the voltage of the controllable power supply 21 continues to decrease, during the power-off process, the duration of the second turn-on signal received by the control terminal 212 of the controllable power supply 21 is shorter, and it receives the second turn-on signal to the controllable power supply 21 The time range for stopping power supply is shorter than the time range for stopping power supply from receiving the second on signal generated according to the shutdown signal during normal power supply, and although the electric energy stored in the second control unit 23 and the power on unit 28 is still delayed, the controllable power supply The control end 212 of 21 only receives the time point of the shutdown signal, but since the voltage of the controllable power supply 21 continues to decrease, it is easier to achieve the conditions for generating the shutdown signal, thus accelerating the process of the controllable power supply 21 stopping power supply to the power unit 24 . However, the electric energy stored in the power-on unit 28 and the second control unit 23 can still ensure that the power-using unit 24 completes the storage of the operating parameters and the update of the flag bits after monitoring the drop in the supply voltage of the controllable power supply 21, so as to ensure that the power supply unit 24 can store the operating parameters and update the flag bits again. After power on, it can continue to run according to the saved operating parameters.

In the above technical solution, during the operation of the power-consuming unit, the controllable power supply uses the energy storage function of the energy storage device in the second control unit and the power-on unit to delay The time when the controllable power supply stops supplying power to the power-consuming unit provides the time and energy for the power-consuming unit to store operating parameters and flags, which helps the power-consuming unit to perform corresponding operations according to the flags and operating parameters after it is powered on again. This solves the technical problem of low continuity of the operation process of household appliances before and after the power circuit is cut off.

FIG. 4 is a schematic structural diagram of a power circuit provided by another embodiment of the present application. The structural schematic diagram corresponds to the embodiment corresponding to FIG. 3 and is the specific circuit structure of this embodiment. As shown in FIG. 4 , the controllable power supply 21 includes a first switching tube Q1 and a voltage conversion unit T, where the first switching tube includes a field effect transistor and a triode. The first control unit 22 includes a first resistor R1, a seventh resistor R7 and a second switch Q2. The second control unit 23 includes a sixth resistor R6, a second resistor R2, a ninth resistor R9 and a ninth capacitor C9. The trigger unit 25 includes a fourteenth resistor R14, a fifteenth resistor R15, the eleventh capacitor C11 and the second diode D2. The power-on unit 28 includes a fourth resistor R4 and a fifth capacitor C5. The switch unit 26 includes a switch SW1, and the pre-conduction unit 27 includes a first diode D1.

In the controllable power supply 21, the first terminal S of the first switch tube Q1 is connected to the power supply VCC_BUS, and its second terminal D is connected to the input terminal and/or the enable terminal of the voltage conversion unit T. The voltage at the connection point is VCC_CTL. The first terminal S of the first switching tube Q1 is also connected to the first control unit 22. More specifically, the first switching tube Q1 is connected to the first terminal of the first resistor R1, and the second terminal of the first resistor R1 is connected to the seventh terminal. The first end of the resistor R7 is connected, the second end of the seventh resistor R7 is connected to the first end C of the second switching tube Q2, the second end E of the second switching tube Q2 is grounded, and the control terminal B of the second switching tube Q2 It is connected to the second terminal 232 of the second control unit 23. More specifically, the control terminal B of the second switching tube Q2 is connected to the second terminal of the sixth resistor R6, and is also connected to the first terminal of the second resistor R2. The first end of the six resistor R6 is connected to the second end E of the second switch Q2 and then grounded. The second end of the second resistor R2 is connected to the first end of the ninth capacitor C9 and is also connected to the first end of the ninth resistor R9. The second end of the ninth capacitor C9 is connected to the ground, and the second end of the ninth resistor R9 is connected to the locking end 242 of the power unit 24 . More specifically, in one embodiment, the power-consuming unit is a single-chip microcomputer, the second end of the ninth resistor R9 is connected to the locking output terminal O of the single-chip computer, and the trigger input terminal I of the single-chip computer is connected to the output terminal 252 of the trigger unit 25 . More specifically, the trigger input terminal I of the microcontroller is connected to the first terminal of the eleventh capacitor C11, and is also connected to the second terminal of the fifteenth resistor R15. The second terminal of the eleventh capacitor C11 is grounded, and the fifteenth resistor R15 is grounded. The first end of R15 is connected to the second end of the fourteenth resistor R14 and then to the second end of the second diode D2. The first end of the fourteenth resistor R14 is connected to the voltage conversion unit T in the controllable power supply 21 The output end of the second diode D2 is connected to the first end 261 of the switch unit 26 and is also connected to the pre-conduction unit 27 . More specifically, the first end of the second diode D2 is connected to the second end of the switch SW1, and is also connected to the first end of the first diode D1. The first end of the switch SW1 is grounded, and the first diode The second end of D1 is connected to the second end 223 of the first control unit 22 . More specifically, the second terminal of the first diode D1 is connected to the first terminal C of the second switch Q2. In addition, the first end 221 of the first control unit 22 is connected to the control end 212 of the controllable unit 21 and is also connected to the first end of the power-on unit 281 . More specifically, the second end of the first resistor R1 and the first end of the seventh resistor R7 are connected to the control terminal G of the first switching tube Q1 and are also connected to the first end of the fourth resistor R4. The fourth resistor The second end of R4 is connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected to ground.

More specifically, the voltage conversion unit T includes four circuit connection structures, including a first voltage conversion unit T1, a second voltage conversion unit T2, a third voltage conversion unit T3 and a fourth voltage conversion unit T4. In the actual circuit connection structure , the voltage conversion unit T is any unit among the above four voltage conversion units. If the voltage conversion unit T is the first voltage conversion unit T1, the first voltage conversion unit T1 includes a first voltage conversion chip C1, a third resistor R3 and a fifth resistor R5, and the second terminal D of the first switch Q1 is connected to the first voltage conversion chip C1. The input terminal VIN of a voltage conversion unit T1 and the first terminal of the third resistor R3 are connected to the enable terminal EN of the first voltage conversion unit T1 and the first terminal of the fifth resistor R5. The second terminal of the five resistor R5 is connected to the ground, the ground terminal GND of the first voltage conversion unit T1 is connected to the ground, and the output voltage of its output terminal VOUT is VCC. Among them, the input terminal VIN of the first voltage conversion unit T1 and the third terminal of the third resistor R3 The voltage at one end is VCC_CTL, and the voltage value of the enable terminal EN is the voltage value of the fifth resistor R5 during the voltage dividing process of the fifth resistor R5 and the third resistor R3; if the voltage conversion unit T is the second voltage When converting unit T2, the second voltage conversion unit T2 includes a second voltage conversion chip C2, an eleventh resistor R11 and a twelfth resistor R12. The input terminal VIN of the second voltage conversion chip C2 is connected to the power supply VCC_BUS, and the enable terminal EN is connected The second end of the eleventh resistor R11 and the first end of the twelfth resistor R12. More specifically, the first end of the eleventh resistor R11 is connected to the second end D of the first switching tube Q1. The voltage at the connection point is VCC_CTL, the second terminal of the twelfth resistor R12 is grounded. In addition, the ground terminal GND of the second voltage conversion chip C2 is grounded. The output voltage of its output terminal VOUT is VCC, and its enable terminal EN voltage is the eleventh resistor R11 and The voltage value of the twelfth resistor R12 during the voltage dividing process of the voltage VCC_CTL; if the voltage conversion unit T is the third voltage conversion unit T3, the third voltage conversion unit T3 includes a third voltage conversion chip C3, the eighth resistor R8 and the tenth resistor R10. The input terminal VIN of the third voltage conversion chip C3 is connected to the second terminal D of the first switch Q1. The voltage at its connection point is VCC_CTL. The use of the third voltage conversion chip C3 The energy terminal EN is connected to the second end of the eighth resistor R8 and the first end of the tenth resistor R10. More specifically, the first end of the eighth resistor R8 is connected to the power supply VCC_BUS, and the second end of the tenth resistor R10 is connected to the ground. In addition, The ground terminal GND of the third voltage conversion chip C3 is grounded, the output voltage of its output terminal VOUT is VCC, and the voltage of its enable terminal EN is VCC. During the voltage dividing process of the eighth resistor R8 and the tenth resistor R10, the power supply VCC_BUS is divided. The voltage value of resistor R10; if the voltage conversion unit T is the fourth voltage conversion unit T4, the fourth voltage conversion unit T4 includes a fourth voltage conversion chip C4, and the fourth voltage conversion chip C4 is the same as the above three voltage conversion chips. The difference is that the fourth voltage conversion chip C4 has no enable terminal. In addition, the input terminal VIN of the fourth voltage conversion chip C4 is connected to the second terminal D of the first switch Q1, and the voltage at the connection point is VCC_CTL. The ground terminal GND of the third voltage conversion chip C4 is grounded, and the output voltage of its output terminal VOUT is is VCC.

When the household appliance is working, the power supply VCC_BUS is powered on. The power supply VCC_BUS, the first resistor R1, the fourth resistor R4, the fifth capacitor C5 and the ground wire form a conduction loop. The voltage at the first end of the fourth resistor R4 is the first switch. The voltage of the control terminal G of the tube Q1 is the divided voltage of the power supply voltage VCC_BUS by the fourth resistor R4 and the fifth capacitor C5 in the loop. When the power supply VCC_BUS is first powered on, the voltage difference between the first terminal S of the first switch Q1 and the control terminal G meets the conduction condition, the first switch Q1 is turned on, and the voltage conversion unit T is powered. Taking the first voltage conversion unit T1 as an explanation, the input terminal VIN of the first voltage conversion chip C1 and the first terminal of the third resistor R3 are powered, and the voltage value is VCC_CTL. The voltage value of the enable terminal EN of the first voltage conversion chip C1 is obtained by dividing the voltage value VCC_CTL by the third resistor and the fifth resistor, and the voltage value there is the voltage value divided by the fifth resistor R5. When both its input terminal VIN and its enable terminal EN meet the conditions, the first voltage conversion chip C1 performs voltage conversion on the input voltage value and outputs the output voltage VCC. The output voltage VCC supplies power to the microcontroller and the trigger unit 25. On the one hand, the first end of the fourteenth resistor R14 in the trigger unit 25 receives the voltage signal of the output voltage VCC. The electrical signal passes through the fourteenth resistor R14 and the fifteenth resistor R14. Resistor R15 reaches the trigger input terminal I of the microcontroller, making this terminal high level. On the other hand, the microcontroller queries the flag bits stored locally.

If the flag bit is the preset interrupt value, the microcontroller reads the locally stored operating parameters and outputs a high level from its locked output terminal O. The high-level electrical signal is transmitted to the second resistor R2 and the second resistor R2 through the ninth resistor R9. The ninth capacitor C9, on the one hand, charges the ninth capacitor C9, and on the other hand, transmits the transmitted electrical signal through the second resistor R2 to the control terminal B of the second switching tube Q2 and the second terminal of the sixth resistor R6, and passes through the sixth resistor R2. Resistor R6 goes to ground. The voltage difference between the second terminal of the sixth resistor R6 and the second terminal of the second switch Q2 is the divided voltage of the sixth resistor R6 in the circuit of the second control unit. When the voltage at the second end of the sixth resistor R6 meets the voltage requirement between the control terminal B and the second terminal E of the second switch Q2, the second switch Q2 is turned on, and the power supply VCC_BUS, The loop composed of the first resistor R1, the seventh resistor R7 and the second switching tube Q2 is turned on. The voltage division of the first resistor R1 in this loop determines the distance between the control terminal G and the first terminal S of the first switching tube Q1. When the voltage value meets the turn-on voltage value of the first switch Q1, the first switch Q1 continues to conduct, and the first voltage conversion chip C1 continues to output the output voltage VCC, The microcontroller can continue to work, and the devices associated with its control continue to run according to the obtained operating parameters until the operation is completed or an instruction signal is received.

If the flag bit is the default value, that is, the household appliance was in a normal stop state when it stopped running last time, the microcontroller will not continue to run until its trigger input terminal I receives a low-level electrical signal, and the power supply VCC_BUS passes through the first resistor R1, The fourth resistor R4 continues to charge the fifth capacitor C5, the potential value of the first terminal of the fourth resistor R4 continues to increase, and the voltage difference between the control terminal G and the first terminal S of the first switch tube Q1 becomes smaller and smaller. , until the conduction requirement of the first switch Q1 is no longer met, the first switch Q1 is turned off, the first voltage conversion chip C1 stops voltage conversion, and the output voltage of its output terminal is set to 0, the power consumption unit 24 and the second control unit 23 no longer receives electric energy and stops consuming power. The time between the time when the first switch Q1 starts to be turned on and the time when it is turned off is the preset time.

When the turn-on voltage of the first switch Q1 starts to decrease, if the switch SW1 in the switch unit 26 receives a pressing operation signal, the switch unit SW1 is turned on while the switch SW1 is being pressed. On the one hand, the power supply VCC_BUS, the first resistor R1, the seventh resistor R7, the first diode D1 and the switch SW1 are turned on to form a first switching circuit, the fifth capacitor C5, the fourth resistor R4, the seventh resistor R7, the A diode D1 and the switch SW1 are also turned on, forming a second switching circuit. The potential value of the first end of the seventh resistor R7 decreases again. This potential value is the difference between the seventh resistor R7 and the first diode in the first switching circuit. The voltage division value of tube D1 in this loop, at the same time, the fifth capacitor C5 begins to discharge through the second switch loop, so that the potential value of the first end of the fourth resistor R4 is equal to the potential value of the first end of the seventh resistor R7, The voltage difference between the control terminal G and the first terminal S of the first switching tube Q1 increases, and the first switching tube Q1 returns to or remains in a conductive state. On the other hand, after receiving the voltage VCC output by the first voltage conversion unit T1, the second control circuit 23 forms a first trigger circuit through the fourteenth resistor R14, the second diode D2 and the switch SW1. The fourteenth resistor R14 The potential value of the second terminal is pulled down from the original high level to a low level. This low level is the conduction voltage value when the second diode D2 is turned on. At the same time, the electric energy stored in the eleventh capacitor C11 Discharge occurs through the fifteenth resistor R15, the second diode D2 and the switch SW1. At this time, the potential at the trigger input terminal I of the microcontroller decreases to a low level, and the microcontroller modifies the locally stored flag bit according to the low level, so that it is updated to the flag bit corresponding to the power-on signal. The microcontroller changes the potential output of the locked output terminal O, which originally outputs a low level, to a high level according to the flag bit. The high level controls the second switch Q2 to be turned on, and the second switch Q2 is turned on according to the high level. The tube Q2 adjusts and maintains the conduction state of the first switch tube Q1, so that the microcontroller continues to obtain the power supply voltage VCC, in which the locked output The process of outputting a high level potential at the output terminal O until the microcontroller obtains the supply voltage VCC has been explained and will not be repeated here.

During the operation of the power consumption unit 24, if the switch SW1 in the switch unit 26 receives a pressing operation signal, the switch unit SW1 is turned on while the switch SW1 is being pressed. Same as the above loop generation and voltage change process, the first trigger loop is turned on again, and the potential at the trigger input terminal I of the microcontroller becomes low level again. The microcontroller modifies the local flag bit according to the low level to make it Updated to the flag bit corresponding to the shutdown signal. Based on this flag, the microcontroller changes the potential of the locked output terminal O, which originally outputs a high level, to a low level, updates the locally stored flag to the preset interrupt value, and stores the current operation. parameter. During the storage process, the ninth capacitor C9 begins to discharge to ensure that the voltage value at the first end of the second resistor R2 will not quickly change to a low level when the output potential of the lock output terminal O is a low level, but will change to a low level according to the second The resistor R2 and the sixth resistor R6 divide the continuously decreasing voltage value at the first end of the ninth capacitor C9 to obtain a continuously decreasing voltage. During the decreasing process of the voltage at the first end of the second resistor R2, the second switch tube The voltage difference between the control terminal B and the second terminal E of Q2 is gradually decreasing. When the voltage difference is less than the first voltage difference threshold for turning on the second switching tube Q2, the second switching tube Q2 is turned off, and the first resistor R1 , the loop composed of the seventh resistor R7 and the second switch Q2 is disconnected. At this time, the potential value of the first end of the seventh resistor R7 begins to rise. This potential rise is due to the power supply VCC_BUS passing through the first resistor R1 and the fourth resistor. R4 is caused by charging the fifth capacitor C5. When the voltage at the first end of the fourth resistor R4 rises to the point where the voltage difference between the control terminal G and the first terminal S of the first switching tube Q1 is less than the second voltage difference threshold, the first switching tube Q1 is turned off and the power is used. The unit 24 and the second control unit 23 no longer receive power to block standby power consumption. During the process when the switch SW1 generates the switching signal until the power unit 24 no longer receives power, the charging of the fifth capacitor C5 and the discharging of the eleventh capacitor C11 provide the microcontroller with time to store operating parameters and update flags.

During the power usage process, if the power supply VCC_BUS is disconnected from the external power supply, the voltage of the power supply VCC_BUS continues to decrease, the voltage of the second terminal D of the first switch transistor Q1 also decreases, and the output voltage of the first voltage conversion unit T1 also continues to decrease. reduce. When the microcontroller detects the continuously decreasing voltage signal, it begins to update the locally stored flag bits to the preset interrupt value, and begins to store the current operating parameters. When the voltage received by the microcontroller begins to decrease, the output level of its locked output terminal O also begins to decrease, and the potential value of the control terminal B of the second switch tube Q2 decreases accordingly. The control terminal B of the second switch tube Q2 and the second The pressure difference between terminal E decreases and the second The switch Q2 is turned off, and the potential of the first end of the seventh resistor R7 begins to rise, causing the first switch Q1 to be turned off, and the first voltage conversion unit T1 stops supplying power to the microcontroller and the trigger unit 25 . In order to delay the turn-off time point of the second switch Q2 and thereby extend the power supply time of the first voltage conversion unit T1, the ninth capacitor C9 begins to discharge to provide electric energy to the second resistor R2, the sixth resistor R6 and the second switch Q2. , to suppress the decreasing speed of the potential of the control terminal of the second switching tube Q2, thereby prolonging the conduction time of the second switching tube Q2.

In the above technical solution, the conduction state of the first switch tube is adjusted by controlling the charging and discharging operations of the capacitor in the power-on unit connected to the first switch tube, so as to realize the controllable power supply to the power-consuming unit and the control unit. The control of the power supply process reduces the power consumption of the power-consuming unit in the standby state. In addition, the capacitor in the second control unit combined with the capacitance in the power-on unit delays the power-consuming unit when it detects the power-down state or receives the signal during operation. When the shutdown instruction is reached, the controllable power supply stops supplying power to the power-consuming unit, providing processing time for the power-consuming unit to store operating parameters and update the corresponding flag bits to ensure that the power-consuming unit receives power again. It can continue to operate according to the stored operating parameters, thereby improving the continuity of the operation process of household appliances before and after the power circuit is cut off.

Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary technical means in the technical field that are not disclosed in this application. . It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

A power circuit, characterized by including:

A controllable power supply is provided with an output end and a control end, and its output end is used to connect to the power supply end of the power consumption unit. It is used to supply power to the power consumption unit under the control of the first turn-on signal, and in the second turn-on signal Supply power to the power-consuming unit under the control of the signal;

The first control unit is provided with a first end and a control end, the first end of which is connected to the control end of the controllable power supply, and is used to generate the first turn-on signal under the control of the first control signal, in The second on signal is generated under the control of the second control signal, and the off signal is generated under the control of the third control signal;

The second control unit is provided with a first end and a second end. The first end is used to connect the locking end of the power unit, and the second end is connected to the control end of the first control unit. It is used to connect the The first control signal is generated when the power-consuming unit outputs a power-on signal, and is also used to generate a second control signal and a third control signal successively when the power-consuming unit outputs a power-off signal; wherein, the power-off signal The signal is generated when the voltage generated by the power-consuming unit at its locking terminal is less than the threshold voltage.
The power circuit according to claim 1, characterized in that the circuit further includes:

A trigger unit, which is provided with an output terminal, the output terminal of which is used to be connected to the trigger terminal of the power unit, which is used to receive a switch signal and generate a trigger signal according to the switch signal;

Wherein, the power unit is configured to generate the power start signal according to the trigger signal when the locally stored flag bit is a power-on signal;

The power-consuming unit is configured to generate the power-off signal according to the trigger signal when the locally stored flag bit is a shutdown signal.
The power supply circuit according to claim 2, characterized in that the circuit further includes:

A switching unit, the first end of which is connected to the input end of the trigger unit, is used to generate a switching signal.
The power circuit according to any one of claims 1 to 3, characterized in that the circuit further includes:

A pre-conduction unit, which is connected to the second end of the first control unit and the first end of the switch unit, and is used to control the first control unit to output a third turn-on signal when receiving a switch signal;

The controllable power supply is used to supply power to the power unit under the control of the third start signal.
The power circuit according to any one of claims 1 to 3, characterized in that the circuit further includes:

A power-on unit, the first end of which is connected to the control end of the controllable power supply, is used to generate a fourth start-up signal when the controllable power supply is initially powered on;

The controllable power supply is used to supply power to the power unit under the control of the fourth start signal.
The power circuit according to any one of claims 1 to 3, characterized in that the controllable power supply includes:

A first switch tube is provided with a control end, a first end and a second end, its control end is connected to the first end of the first control unit, and its first end is connected to the power supply;

A voltage conversion unit, the enabling end of which is connected to the second end of the first switching tube, and the output end of which is connected to the power supply end of the power unit;

or

A first switch tube is provided with a control end, a first end and a second end, its control end is connected to the first end of the first control unit, and its first end is connected to the power supply;

The input end of the voltage conversion unit is connected to the second end of the first switch tube, and the output end is connected to the power supply end of the power consumption unit.
The power circuit according to any one of claims 1 to 3, characterized in that the first control unit includes:

A first resistor, the first end of which is connected to the power supply, and the second end of which is connected to the control end of the controllable power supply;

A seventh resistor, the first end of which is connected to the second end of the first resistor, and the second end of which is connected to the pre-conduction unit;

The second switch tube has a first end connected to the second end of the seventh resistor and the pre-conduction unit, a second end connected to ground, and a control end connected to the second end of the second control unit.
The power circuit according to any one of claims 1 to 3, characterized in that the second control unit includes:

a sixth resistor, the first end of which is connected to the second end of the first control unit and then grounded;

a second resistor, the first end of which is connected to the second end of the sixth resistor and the control end of the first control unit;

A ninth resistor, the first end of which is connected to the second end of the second resistor, and the second end of which is connected to the locking end of the power unit;

The ninth capacitor has a first end connected to the second end of the second resistor and the ninth resistor. The first end and its second end are connected to ground.
The power circuit according to any one of claims 1 to 3, characterized in that the trigger unit includes:

a fourteenth resistor, the first end of which is connected to the output end of the controllable power supply;

A fifteenth resistor, the first end of which is connected to the second end of the fourteenth resistor, and the second end of which is connected to the trigger end of the power unit;

An eleventh capacitor, the first end of which is connected to the second end of the fifteenth resistor and the trigger end of the power unit, and the second end of which is grounded;

The second diode has a first end connected to the first end of the switch unit and a second end connected to the second end of the fourteenth resistor and the first end of the fifteenth resistor.
The power circuit according to any one of claims 1 to 3, characterized in that the power-on unit includes:

a fourth resistor, the first end of which is connected to the control end of the controllable power supply and the first end of the first control unit;

The first end of the fifth capacitor is connected to the second end of the fourth resistor, and the second end is connected to ground.