CN114583813A

CN114583813A - Power supply circuit

Info

Publication number: CN114583813A
Application number: CN202210253315.1A
Authority: CN
Inventors: 刘伟; 吕杨; 高秋英
Original assignee: Haier Smart Home Co Ltd; Chongqing Haier Front Loading Washing Machine Co Ltd
Current assignee: Haier Smart Home Co Ltd; Chongqing Haier Front Loading Washing Machine Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-06-03
Also published as: WO2023173986A1

Abstract

The application provides a power supply circuit, includes: a controllable power supply, a first control unit and a second control unit, the controllable power supply is used for supplying power to the power consumption unit under the control of the first opening signal and the second opening signal, the first control unit is used for generating a first opening signal under the control of the first control signal, the power supply circuit is used for generating a second starting signal after the power supply unit outputs the power supply closing signal so as to prolong the time point of the controllable power supply stopping supplying power to the power consumption unit to ensure the storage of the power consumption unit to the operation parameters, thereby improving the continuity of the operation process of the household appliance before and after the power supply circuit is powered off.

Description

Power supply circuit

Technical Field

The application relates to the technical field of circuits, in particular to a power supply circuit.

Background

The power supply circuit is a circuit for supplying power to the power utilization unit in the circuit. In the household appliance, the switched-on power supply circuit ensures the normal operation of the household appliance according to the preset operation parameters.

When the household appliance is used, the sudden power failure of the power supply circuit causes the household appliance to stop working when the preset working process is not completed, and the household appliance cannot continue to work according to the operation parameters corresponding to the power failure moment after being electrified again, so that the continuity of the operation process of the household appliance is low.

Therefore, how to improve the continuity of the operation process of the household appliance before and after the power circuit is powered off becomes an urgent problem to be solved.

Disclosure of Invention

The application provides a power supply circuit for solve the technical problem that the continuity of the operation process of a household appliance is low before and after the power supply circuit is powered off.

The present application provides a power supply circuit, comprising:

the controllable power supply is provided with an output end and a control end, the output end of the controllable power supply is connected with a power supply end of the power utilization unit, and the controllable power supply is used for supplying power to the power utilization unit under the control of a first starting signal and supplying power to the power utilization unit under the control of a second starting signal;

the first control unit is provided with a first end and a control end, the first end of the first control unit is connected with the control end of the controllable power supply and is used for generating a first opening signal under the control of a first control signal, generating a second opening signal under the control of a second control signal and generating a closing signal under the control of a third control signal;

the second control unit is provided with a first end and a second end, the first end of the second control unit is used for being connected with the locking end of the power utilization unit, the second end of the second control unit is connected with the control end of the first control unit, the second control unit is used for generating a first control signal when the power utilization unit outputs a power supply starting signal, and the second control unit is also used for sequentially generating a second control signal and a third control signal when the power utilization unit outputs a power supply closing signal; the power-off signal is generated when the voltage generated by the power unit at the locking end of the power unit is less than the threshold voltage.

Optionally, the circuit further comprises:

the trigger unit is provided with an output end, the output end of the trigger unit is connected with the trigger end of the power utilization unit, and the trigger unit is used for receiving the switching signal and generating a trigger signal according to the switching signal;

the power utilization unit is used for generating a power supply starting signal according to the trigger signal when the locally stored flag bit is a starting signal;

the power utilization unit is used for generating a power supply closing signal according to the trigger signal when the locally stored flag bit is a shutdown signal.

Optionally, the circuit further comprises:

and the first end of the switch unit is connected with the input end of the trigger unit and is used for generating a switch signal.

Optionally, the circuit further comprises:

the pre-conducting unit is connected to the second end of the first control unit and the first end of the switch unit and is used for controlling the first control unit to output a third opening signal when receiving the switch signal;

the controllable power supply is used for supplying power to the power utilization unit under the control of the third opening signal.

Optionally, the circuit further comprises:

the first end of the power-on unit is connected with the control end of the controllable power supply and is used for generating a fourth starting signal when the controllable power supply is initially powered on;

the controllable power supply is used for supplying power to the power utilization unit under the control of the fourth starting signal.

Optionally, the controllable power supply comprises:

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

the enabling end of the voltage conversion unit is connected with the second end of the first switching tube, and the output end of the voltage conversion unit is connected with the power supply end of the power utilization unit;

or

and the input end of the voltage conversion unit is connected with the second end of the first switching tube, and the output end of the voltage conversion unit is connected with the power supply end of the power utilization unit.

Optionally, the first control unit comprises:

the first end of the first resistor is connected with the power supply, and the second end of the first resistor is connected with the control end of the controllable power supply;

a first end of the seventh resistor is connected with the second end of the first resistor, and a second end of the seventh resistor is connected with the pre-conducting unit;

and a first end of the second switch tube is connected with the second end of the seventh resistor and the pre-conducting unit, a second end of the second switch tube is grounded, and a control end of the second switch tube is connected with a second end of the second control unit.

Optionally, the second control unit comprises:

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

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

a ninth resistor, a first end of which is connected with a second end of the second resistor, and a second end of which is connected with a locking end of the power utilization unit;

and a 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 a second end of the ninth capacitor is grounded.

Optionally, the trigger unit includes:

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

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

and a first end of the second diode is connected with the first end of the switch unit, and a second end of the second diode is connected with the second end of the fourteenth resistor and the first end of the fifteenth resistor.

Optionally, the power-on unit includes:

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

and a first end of the fifth capacitor is connected with the second end of the fourth resistor, and a second end of the fifth capacitor is grounded.

The present application provides a power supply circuit, comprising: the controllable power supply is provided with an output end and a control end, the output end of the controllable power supply is connected with a power supply end of the power utilization unit, and the controllable power supply is used for supplying power to the power utilization unit under the control of the first starting signal and supplying power to the power utilization unit under the control of the second starting signal; the first control unit is provided with a first end and a control end, wherein the first end of the first control unit is connected with the control end of the controllable power supply and is used for generating a first opening signal under the control of a first control signal, generating a second opening signal under the control of a second control signal and generating a closing signal under the control of a third control signal; the second control unit is provided with a first end and a second end, wherein the first end of the second control unit is used for being connected with the locking end of the power utilization unit, the second end of the second control unit is connected with the control end of the first control unit, the second control unit is used for generating a first control signal when the power utilization unit outputs a power supply starting signal, and is also used for sequentially generating a second control signal and a third control signal when the power utilization unit outputs a power supply closing signal; the power supply circuit outputs a second control signal by using the second control unit after outputting the power supply closing signal through the power utilization unit so that the first control unit generates a second opening signal, the time point when the controllable power supply stops supplying power to the power utilization unit is prolonged, the time and the electric energy of the power utilization unit for storing the operation parameters are provided, and the technical problem that the continuity of the operation process of the household appliance is low before and after the power supply circuit is powered off is solved.

Drawings

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

Fig. 1 is a diagram of an application scenario of a power circuit according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

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

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the processes, methods, articles, or apparatuses that comprise the element, and that elements, features, or elements having the same designation in different embodiments of the application may or may not have the same meaning as that of the other elements in the embodiment illustrated and/or described in further detail in connection with the context of that embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. Also, 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 will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or," "and/or," "including at least one of the following," and the like, as used herein, are to be construed as inclusive or mean any one or any combination. For example, "includes at least one of: 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 ", again for example," 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'. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

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

In view of the above technical problems, an embodiment of the present application provides a power supply circuit, which aims to solve the problem of improving the continuity of the operation process of a household appliance before and after the power supply circuit is powered off. The technical idea of the application is as follows: the unit with the energy storage function is arranged in the power circuit, so that the time for stopping the operation of the household appliance is prolonged after the household appliance receives a power failure signal in the operation process, the control unit in the household appliance is ensured to store the parameters of the household appliance which operate before the power failure or the shutdown, the household appliance can continue to operate according to the stored parameters after being powered on or started, and the continuity of the operation process of the household appliance before and after the power circuit is powered off is improved.

Fig. 1 is a diagram of an application scenario of a power supply circuit according to an embodiment of the present application, as shown in fig. 1, a household appliance 10 includes a power supply circuit 11 and an electricity utilization unit 12, the power supply circuit 11 includes a controllable power supply 111 and a power supply control unit 112, and the electricity utilization unit 12 includes a control unit 121 and an execution unit 122. The power circuit 11 is connected to the power consumption unit 12, an external power supply 13 is provided outside the household appliance 10, and the power circuit 11 is connected to the external power supply 13. In the power supply circuit 11, a controllable power supply 111 is connected to a power supply control unit 112. In the power consumption unit 12, a control unit 121 is connected to an execution unit 122. More specifically, the power circuit 11 is configured to provide power required by the power unit 12 and the power supply control unit 112 during operation, the power supply control unit 112 is configured to control on and off states of the controllable power source 111, and the control unit 121 is configured to control an operation state of the power supply control unit 112 and also configured to control an operation 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 supply conducting signal, and transmits the power supply conducting signal to the controllable power supply 111, so as to provide conducting conditions for the controllable power supply 111, the controllable power supply 111 is conducted, the electric energy of the external power supply 13 is transmitted to the power utilization unit 12 through the controllable power supply 111, that is, the power supply circuit 11 provides the electric energy for the power utilization unit 12, and the control unit 121 controls the execution unit 122 to execute corresponding operations within a preset time range according to a preset control program. In the operation process of the household appliance 10, in an embodiment, the external power supply 13 is disconnected from the controllable power supply 111, the voltage that the power circuit 11 can provide is gradually reduced, that is, the electric energy that the household appliance 10 can obtain is gradually reduced, the power supply control unit 112 uses the built-in energy storage device to maintain the power supply control unit 112 to still generate the power supply on signal to the controllable power supply 111 within a preset time range, so that the controllable power supply 111 still can keep the on state, and the power utilization unit 12 can still obtain the electric energy until the electric energy stored in the energy storage device in the power supply control unit 112 is consumed to the extent that the power supply control unit 112 cannot generate the power supply on signal. When the voltage provided by the external power supply 13 to the power circuit 11 is gradually decreased, the power consumption unit 12 can obtain the electric energy transmitted from the controllable power supply 111 under the action of the electric energy provided by the energy storage device in the power supply control unit 112, but the control unit 121 can still detect that the input voltage and the electric energy of the power consumption unit 12 are continuously decreased. In the time range from when the control unit 121 obtains the continuously reduced power until the controllable power supply 111 stops supplying power, the control unit 121 stores the operation parameters of the execution unit 122 locally, and updates the stored flag bit to the preset interrupt value.

In another embodiment, during the operation of the power utilization unit 12, the connection state between the external power supply 13 and the controllable power supply 111 is normal, the control unit 121 receives the power-off signal, the power utilization unit 12 transmits the signal to the power supply circuit 11 to control the power supply circuit to perform the power-off operation, that is, the power supply control unit 112 delays the time point of performing the power-off operation by using the stored electric energy, so as to ensure that the control unit 121 stores the operation parameters of the execution unit 122, and updates the stored flag bit to the preset interrupt value.

After the household appliance 10 stops operating, if the external power supply 13 supplies power to the household appliance 10 again, the power supply control unit 112 generates a power supply on signal again and transmits the signal to the controllable power supply 111, so that the controllable power supply 111 supplies power to the power consumption unit 12. After the power utilization unit 12 obtains the electric energy, the flag bit stored locally is queried. If the flag is the preset interrupt value, the operation parameters stored locally are obtained, the state of the execution unit 122 is adjusted according to the operation parameters, and the execution unit 122 is controlled to continue to operate from the state of the last power-off completion.

When the execution unit 122 in the household appliance 10 performs normal power-off after completing all operation operations according to the operation program in the control unit 121, the control unit 121 updates the flag bit stored locally to a default value, wherein the default value is different from the preset interrupt value. If the household appliance 10 is powered on again and operates, after the control unit 121 obtains the electric energy, it is queried that the flag bit stored locally is the default value, and then no other operation is performed until the control unit 121 receives the input operation instruction.

Fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the power supply circuit 20 includes a controllable power supply 21, a first control unit 22, and a second control unit 23, where the controllable power supply 21 has an output terminal 211 and a control terminal 212, the first control unit 22 has a first terminal 221 and a control terminal 222, and the second control unit 23 has a first terminal 231 and a second terminal 232. The output terminal 211 of the controllable unit 21 is connected to the power consuming unit 24, and more specifically, the power consuming unit 24 includes a power supply terminal 241 and a locking terminal 242, the output terminal 211 of the controllable unit 21 is connected to the power supply terminal 241 of the power consuming unit 24, the locking terminal 242 of the power consuming unit 24 is connected to the first terminal 231 of the second control unit 23, the second terminal 232 of the second control unit 23 is connected to the control terminal 222 of the first control unit 22, and the first terminal 221 of the first control unit 22 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 supply start signal generated by the power utilization unit 24 and transmitted from the locking end 242 of the power utilization unit 24, the second control unit 23 generates a first control signal according to the power supply start signal, and transmits the first control signal from the second end 232 of the second control unit 23 to the control end 222 of the first control unit 22, the first control unit 222 generates a first turn-on signal according to the received first control signal, and transmits the first turn-on signal from the first end 221 to the control end 212 of the controllable power supply 21, and the controllable power supply 21 supplies power to the power utilization unit 24 under the control of the first turn-on signal.

During the power supply process of the power circuit 20 and the operation process of the power consuming unit 24, if the power supply voltage generated by the locking terminal 242 of the power consuming unit 24 is smaller than the threshold voltage, the power consuming unit 24 generates a power off signal and transmits the power off signal from the locking terminal 242 of the power consuming unit 24 to the first terminal 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 the second end 232 to the control end 222 of the first control unit 22. The second control signal is used to enable the controllable power supply 21 to supply power to the power consumption unit 24 under the indication of the power-off signal, so as to use the control unit in the power consumption unit 24 to store the flag bit and the operation parameter into the local storage according to the power-off condition. That is, if the power-off signal is a power-off signal received after the power-using unit 24 completes all operation operations, the power-off signal is used to normally end the operation process of the household appliance, and the updated flag bit is a default value corresponding to normal power-off; if the power-off signal is a signal received during the operation of the power consumption unit 24, the second control signal generated according to the power-off signal is used to delay the time when the controllable power supply 21 stops supplying power to the power consumption unit 24, so as to use the control unit in the power consumption unit 24 to store the operation parameters of the execution unit and update the flag bit stored locally, where the flag bit is a preset interrupt value. The first control unit 22 further generates a turn-off signal according to the obtained third control signal, the control terminal 212 of the controllable power supply 21 will no longer receive the turn-on signal, and the controllable power supply 21 stops supplying power to the power consuming unit 24.

In the technical scheme, the power supply circuit generates the opening signal and the closing signal sequentially through the second control unit and the first control unit according to the signal generated by the power utilization unit in the power failure process of the household appliance, the controllable power supply keeps the state of continuously supplying power to the power utilization unit according to the opening signal so that the power utilization unit can store the current operation parameter and/or the flag bit, the household appliance can execute corresponding operation according to the flag bit and the operation parameter when obtaining electric energy again, and the continuity of the operation process of the household appliance before and after the power supply circuit is powered off is improved.

Fig. 3 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application, and as shown in fig. 3, the power supply circuit 20 further includes a trigger unit 25, a switch unit 26, a pre-conducting unit 27, and a power-on unit 28 on the basis of the corresponding embodiment of fig. 2, where the trigger unit 25 includes an input end 251 and an output end 252, the switch unit 26 includes a first end 261, the power-on unit 28 includes a first end 281, the first control unit 22 further includes a second end 223, and the power-on unit 24 further 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 utilization unit 24, the lock end 242 of the power utilization 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, the first end 231 of the first control unit 22 is connected to the control end 212 of the controllable power supply 21, and the output end 211 of the controllable unit 21 is connected to the power supply end 241 of the power utilization unit 24. Furthermore, the first terminal 261 of the switching unit 26 is further connected to a pre-conducting unit 27, the pre-conducting unit 27 is connected to the second terminal 223 of the first control unit 22, and the control terminal 212 of the controllable power source 21 is further connected to the first terminal 281 of the power-up unit 28.

When the controllable power source 21 receives a power-on signal from the external power supply unit when the household appliance starts to operate, the power-on unit 28 also receives the power-on signal. The power-on unit 28 generates a fourth start signal according to the received power-on signal and outputs from its first terminal 281 to the control terminal 212 of the controllable power source 21. The controllable unit 21 starts to supply power from its output terminal 211 to the power supply terminal 241 of the power consuming unit 24 according to the fourth start signal it receives. After receiving the power supply signal, the power supply terminal 241 of the power utilization unit 24 firstly queries a flag bit stored locally, and if the flag bit is a preset interrupt value corresponding to interrupt power failure, directly reads the operation parameter stored locally, and outputs a power supply start signal from the locking terminal 242 to the second control unit 23, so that the second control unit generates a first control signal according to the signal, controls the first control unit 22 to generate a first start signal and sends the signal to the controllable power supply 21, so as to ensure that the controllable power supply 21 continuously supplies power to the power utilization unit 24 without being triggered by the switching signal of the switching unit 26, and the power utilization unit 24 continuously executes operation in a state corresponding to the operation parameter until all operation operations are completed; if the flag bit is the default value corresponding to the normally closed flag bit, after the power-on unit 28 generates and sends the fourth start signal with the preset duration to the controllable power supply 21, the power supply to the power-using unit 24 is stopped, that is, within the time range corresponding to the preset duration, the controllable power supply 21 supplies power to the power-using unit 24, and if the time range is exceeded, the controllable power supply 21 stops supplying power, so as to prevent the power-using unit 24 from continuously consuming power in the standby process, so as to improve the utilization rate of the household appliance to the electric energy, and realize energy saving.

In the process of powering on the household appliance, after the switch unit 26 receives the switch trigger signal, the switch signal is generated, and on one hand, the switch signal is transmitted to the pre-conducting unit 27 through the first end 261 thereof, and is transmitted to the second end 223 of the first control unit 22 through the pre-conducting unit 27, so that the first control unit 22 generates the third control signal, and transmits the third control signal to the control end 212 of the controllable power supply 21 from the first end 221 thereof, so that the controllable power supply 21 maintains the power supply state thereof in the process of supplying power to the power utilization unit 24, or the power supply is resumed under the condition that the controllable power supply 21 stops supplying power to the power utilization unit 24, wherein the reason that the controllable power supply 21 stops supplying power to the power utilization unit 24 is that the power supply is stopped after receiving the fourth start signal of the power utilization unit 28 for a preset time. On the other hand, the switching signal is transmitted to the input end 251 of the trigger unit 25 through the first end 261 of the switching unit 26, and the trigger unit 25 generates a trigger signal according to the received switching signal and outputs the trigger signal from the output end 252 of the trigger unit 25 to the trigger end 243 of the power consumption unit 24.

The power utilization unit 24 updates the flag bit corresponding to the switch trigger signal, which is stored locally, according to the trigger signal, that is, the flag bit is adjusted to the flag bit corresponding to the power-on signal. The power consuming unit 24 generates a power activation signal according to the flag bit, and transmits the power activation 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 supply start signal, and sends the first control signal from the second end 232 thereof to the control end 222 of the first control unit 22. The first control unit 22 generates a first turn-on signal in dependence of the received first control signal and transmits the first turn-on signal from its first terminal 221 to the control terminal 212 of the controllable power supply 21. The controllable unit 21 starts and continues supplying power from its output 211 to the power consuming unit 24 in response to the received first turn-on signal.

When the switch unit 26 receives the switch trigger signal again, the switch signal is generated again, and the switch signal is still transmitted to the input end 251 of the trigger unit 25 through the first end 261 of the switch unit 26, and the trigger unit 25 generates the trigger signal according to the received switch signal, and outputs the trigger signal from the output end 252 of the trigger unit 25 to the trigger end 243 of the power unit 24. The power utilization unit 24 updates the flag bit corresponding to the switch trigger signal, which is stored locally, according to the trigger signal, that is, the flag bit is adjusted 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 sequentially transmits the two signals to the control terminal 222 of the first control unit 22 from the second terminal 232 thereof after the two signals are generated. Wherein the power down signal indicates that the power-using cell 24 is generating when the voltage produced at its locked end 242 is less than a threshold voltage. When the first control unit 22 receives the second control signal, it generates a second start signal according to the second control signal and transmits the second start signal to the control terminal 212 of the controllable power supply 21 through the first terminal 221 thereof. Wherein the second turn-on signal is used for maintaining the controllable power supply 21 to supply power to the power consumption unit 24 after the household appliance receives the turn-off indication, and the signal is generated continuously by supplying power from the energy storage device in the second control unit 23 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 shut down signal is generated in dependence on the third control signal, which signal is used to disconnect the transmission of the electrical signal between the first control unit 22 and the controllable unit 21. When the control terminal 212 of the controllable power source 21 does not receive the control signal, it starts to receive the signal generated by the power supply unit 28 according to the stored electric energy, so as to maintain that the power supply unit can still supply power to the power consumption unit 24 through the output terminal 211 until the electric energy stored in the power supply unit 28 is insufficient to support the controllable power source 21 to continue supplying power, and the power consumption unit 24 stops operating. The electric energy stored in the power-on unit 28 is also used for delaying the time when the controllable power supply 21 stops supplying power to the power-consumption power supply 24, and in the process that the power-on unit 28 and the second control unit 23 delay the time point when the controllable unit 21 stops supplying power by using the stored electric energy, the power-consumption unit 24 updates the flag bit stored locally according to the operation state of the power-consumption unit and stores the operation parameter according to the flag bit, so as to ensure that the power-consumption unit 24 continues to operate according to the stored operation parameter and the flag bit when receiving the power-on signal next time. In the process of supplying power to the power consumption unit 24 by the controllable power source 21, the voltage signal received by the power supply terminal 241 of the power consumption unit 24 is not changed.

When the household electrical appliance is in operation, the switch unit 26 does not receive the switch trigger signal, but the voltage supplied from the controllable power supply 21 to the power supply terminal 241 of the power consumption unit 24 through the output terminal 211 thereof is continuously reduced, the power consumption unit 24 starts to update the flag bit stored locally according to the detected voltage change, so that the flag bit is updated to the preset interrupt value, and the operation parameters of the power consumption unit 24 are stored. As the input voltage of the power consuming unit 24 continuously decreases, the voltage generated at the locking terminal 242 thereof also decreases, and when the voltage is smaller than the threshold voltage, a power-off signal is generated and transmitted to the first terminal 231 of the second control unit 23 through the locking terminal 242 thereof. Similarly to the above case, 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 second on signal and the off signal, and sequentially transmits the two signals to the control terminal 212 of the controllable power supply 21. Because the voltage of the controllable power supply 21 continuously decreases, in the power failure process, the duration of the second start signal received by the control terminal 212 of the controllable power supply 21 is shorter, the time range from the time when the second start signal is received to the time when the controllable power supply 21 stops supplying power is shorter than the time range from the time when the second start signal generated according to the shutdown signal is received to the time when the controllable power supply 21 stops supplying power in the normal power supply process, and although the time when the control terminal 212 of the controllable power supply 21 only receives the shutdown signal is still delayed by the electric energy stored in the second control unit 23 and the power-on unit 28, the condition for generating the shutdown signal is more easily achieved because the voltage of the controllable power supply 21 continuously decreases, so that the process that the controllable power supply 21 stops supplying power to the power-using unit 24 is accelerated. However, the power supply unit 28 and the second control unit 23 can still ensure that the power utilization unit 24 completes the storage of the operation parameters and the update of the flag bit from the monitoring of the decrease of the power supply voltage of the controllable power supply 21, so as to ensure that the power utilization unit continues to operate according to the stored operation parameters after being powered on again.

In the technical scheme, in the operation process of the power utilization unit, after the controllable power supply is powered off or the power utilization unit receives a signal for generating a shutdown signal, the time that the controllable power supply stops supplying power to the power utilization unit is delayed by utilizing the energy storage effect of the energy storage devices in the second control unit and the power utilization unit so as to provide the time and the electric energy for storing the operation parameters and the flag bit of the power utilization unit, and the power utilization unit can execute corresponding operation according to the flag bit and the operation parameters after being powered on again, so that the technical problem of low continuity of the operation process of the household appliance before and after the power supply circuit is powered off is solved.

Fig. 4 is a schematic structural diagram of a power supply circuit according to another embodiment of the present application, where the schematic structural diagram corresponds to the embodiment shown in fig. 3 and is a specific circuit structure of the embodiment. As shown in fig. 4, the controllable power supply 21 includes a first switching tube Q1 and a voltage conversion unit T, wherein 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, an eleventh capacitor C11, and a second diode D2. The power-up unit 28 includes a fourth resistor R4 and a fifth capacitor C5. The switching unit 26 includes a switch SW1, and the pre-turn-on unit 27 includes a first diode D1.

In the controllable power supply 21, a first end S of a first switching tube Q1 is connected to a power supply VCC _ BUS, a second end D thereof is connected to an input end and/or an enable end of a voltage conversion unit T, and a voltage at a connection point is VCC _ CTL. The first end S of the first switch tube Q1 is further connected to the first control unit 22, more specifically, the first ends of the first switch tube Q1 and the first resistor R1 are connected, the second end of the first resistor R1 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the first end C of the second switch tube Q2, the second end E of the second switch tube Q2 is grounded, the control end B of the second switch tube Q2 is connected to the second end 232 of the second control unit 23, more specifically, the control end B of the second switch tube Q2 and the second end of the sixth resistor R6 are connected to the first end of the second resistor R2, the first end of the sixth resistor R6 and the second end E of the second switch tube Q2 are connected to the ground, the second end of the second resistor R2 is connected to the first end of the ninth capacitor C9, the ninth resistor R9, the second end of the ninth resistor R9 is connected to the ninth capacitor R9, and the ninth end of the ninth resistor R242 is connected to the ninth capacitor C9. More specifically, the power utilization unit is a single chip microcomputer in one embodiment, the second terminal of the ninth resistor R9 is connected to the lock output terminal O of the single chip microcomputer, and the trigger input terminal I of the single chip microcomputer is connected to the output terminal 252 of the trigger unit 25. More specifically, a trigger input terminal I of the single chip is connected to a first terminal of an eleventh capacitor C11, and is further connected to a second terminal of a fifteenth resistor R15, a second terminal of the eleventh capacitor C11 is grounded, a first terminal of a fifteenth resistor R15 is connected to a second terminal of a fourteenth resistor R14 and then connected to a second terminal of a second diode D2, a first terminal of the fourteenth resistor R14 is connected to an output terminal of a voltage conversion unit T in the controllable power supply 21, a first terminal of a second diode D2 is connected to a first terminal 261 of the switching unit 26, and is further connected to the pre-conducting unit 27. More specifically, a first terminal of the second diode D2 is connected to the second terminal of the switch SW1 and also to a first terminal of the first diode D1, a first terminal of the switch SW1 is grounded, and a second terminal of the first diode D1 is connected to the second terminal 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 switching tube Q2. Furthermore, the first terminal 221 of the first control unit 22 is connected to the control terminal 212 of the controllable unit 21 and to a first terminal 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 end G of the first switching tube Q1, and are also connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is grounded.

More specifically, the voltage converting unit T includes four circuit connection structures including a first voltage converting unit T1, a second voltage converting unit T2, a third voltage converting unit T3, and a fourth voltage converting unit T4, and in an actual circuit connection structure, the voltage converting unit T is any one of the four voltage converting units. If the voltage converting unit T is the first voltage converting unit T1, the first voltage converting unit T1 includes a first voltage converting chip C1, a third resistor R3 and a fifth resistor R5, a second end D of the first switch Q1 is connected to the input terminal VIN of the first voltage converting unit T1 and a first end of the third resistor R3, a second end of the third resistor R3 is connected to the enable terminal EN of the first voltage converting unit T1 and a first end of the fifth resistor R5, a second end of the fifth resistor R5 is grounded, a ground terminal of the first voltage converting unit T1 is grounded, and an output voltage of the output terminal VOUT is VCC, wherein the voltage of the input terminal VIN of the first voltage converting unit T1 and the first end of the third resistor R3 is VCC _ CTL, the voltage value of the enable terminal EN is the voltage value of the fifth resistor R5 and the third resistor R3 in the process of dividing the voltage of the fifth voltage VCC _ VCC resistor R5; if the voltage converting unit T is the second voltage converting unit T2, the second voltage converting unit T2 includes a second voltage converting chip C2, an eleventh resistor R11 and a twelfth resistor R12, the input terminal VIN of the second voltage converting chip C2 is connected to the power VCC _ BUS, the enable terminal EN is connected to the second terminal of the eleventh resistor R11 and the first terminal of the twelfth resistor R12, more specifically, the first terminal of the eleventh resistor R11 is connected to the second terminal D of the first switching tube Q1, the voltage of 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 converting chip C2 is grounded, the output voltage of the output terminal VOUT is VCC, the enable terminal EN is the voltage of the eleventh resistor R11 and the twelfth resistor R12, and the voltage value of the twelfth resistor R12 is obtained during the voltage division of the voltage VCC _ CTL; if the voltage converting unit T is the third voltage converting unit T3, the third voltage converting unit T3 includes a third voltage converting chip C3, an eighth resistor R8 and a tenth resistor R10, an input terminal VIN of the third voltage converting chip C3 is connected to the second terminal D of the first switching tube Q1, a voltage of a connection point is VCC _ CTL, an enable terminal EN of the third voltage converting chip C3 is connected to the second terminal of the eighth resistor R8 and the first terminal of the tenth resistor R10, more specifically, the first terminal of the eighth resistor R8 is connected to the power VCC _ BUS, the second terminal of the tenth resistor R10 is grounded, in addition, a ground terminal GND of the third voltage converting chip C3 is grounded, an output voltage of an output terminal VOUT is VCC, a voltage of the enable terminal EN is the voltage of the eighth resistor R8 and the tenth resistor R10, and a voltage value of the tenth resistor R10 is obtained during voltage dividing the power VCC _ BUS; if the voltage converting unit T is the fourth voltage converting unit T4, the fourth voltage converting unit T4 includes a fourth voltage converting chip C4, and the fourth voltage converting chip C4 is different from the above three voltage converting chips in that the fourth voltage converting chip C4 has no enable terminal, in addition, the input terminal VIN of the fourth voltage converting chip C4 is connected to the second terminal D of the first switch tube Q1, the voltage of the connection point is VCC _ CTL, the ground terminal GND of the third voltage converting chip C4 is grounded, and the output voltage VOUT is VCC.

When the household appliance works, 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, and the voltage of the first end of the fourth resistor R4, namely the voltage of the control end G of the first switch tube Q1, is the voltage division of the power supply voltage VCC _ BUS by the fourth resistor R4 and the fifth capacitor C5 in the loop. When the power source VCC _ BUS is just powered on, the voltage difference between the first end S of the first switch tube Q1 and the control end G satisfies the conduction condition, the first switch tube Q1 is conducted, and the voltage conversion unit T is powered on. Explained with the first voltage conversion unit T1, 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, where the voltage value is obtained by dividing the voltage value VCC _ CTL by the fifth resistor R5. The first voltage conversion chip C1 converts the input voltage value and outputs the output voltage VCC when the input terminal VIN and the enable terminal EN both satisfy the condition. The output voltage VCC supplies power to the single chip microcomputer and the trigger unit 25, on one hand, a first end of a fourteenth resistor R14 in the trigger unit 25 receives a voltage signal of the output voltage VCC, and the electrical signal reaches a trigger input end I of the single chip microcomputer through the fourteenth resistor R14 and a fifteenth resistor R15, so that the end is at a high level. On the other hand, the singlechip inquires the flag bit stored locally.

If the flag bit is a preset interrupt value, the single chip microcomputer reads the running parameters stored locally, and outputs a high level from the locking output end O, the high-level electric signal is transmitted to the second resistor R2 and the ninth capacitor C9 through the ninth resistor R9, on one hand, the ninth capacitor C9 is charged, on the other hand, the transmitted electric signal reaches the control end B of the second switching tube Q2 and the second end of the sixth resistor R6 through the second resistor R2, and reaches the ground end through the sixth resistor R6. The voltage difference between the second end of the sixth resistor R6 and the second end of the second switch Q2 is the voltage division of the sixth resistor R6 in the circuit of the second control unit. When the voltage of the second end of the sixth resistor R6 meets the voltage requirement between the control end B and the second end E of the second switch tube Q2, the second switch tube Q2 is turned on, a loop formed by the power source VCC _ BUS, the first resistor R1, the seventh resistor R7 and the second switch tube Q2 in the first control unit 22 is turned on, the voltage division of the first resistor R1 in the loop determines the voltage value between the control end G of the first switch tube Q1 and the first end S thereof, when the voltage value meets the turn-on voltage value of the first switch tube Q1, the first switch tube Q1 is continuously turned on, the first voltage conversion chip C1 continuously outputs the output voltage VCC, the single chip microcomputer can continuously operate, and the single chip microcomputer controls the associated devices to continue to operate according to the obtained operation parameters until the operation is completed or the command signal is received.

If the flag bit is a default value, that is, the household appliance is in a normal stop state when stopping operation last time, the single chip microcomputer does not continue to operate until the trigger input end I of the single chip microcomputer receives a low-level electric signal, and the power supply VCC _ BUS continuously charges the fifth capacitor C5 through the first resistor R1 and the fourth resistor R4, the potential value of the first end of the fourth resistor R4 continuously increases, the voltage difference between the control end G and the first end S of the first switching tube Q1 becomes smaller and smaller until the conduction requirement of the first switching tube Q1 is not met, the first switching tube Q1 is turned off, the first voltage conversion chip C1 stops voltage conversion, the output voltage of the output end of the first switching tube Q1 is set to 0, the electric unit 24 and the second control unit 23 no longer receive electric energy, power consumption is stopped, and the duration of the first switching tube Q1 from the time point of starting conduction to the time point of turning off is a preset duration.

When the on voltage of the first switch tube Q1 is kept low from the beginning, if the switch SW1 of the switch unit 26 receives the pressing operation signal, the switch unit SW1 is turned on while the switch SW1 is pressed. On the one hand, the power 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 switch loop, the fifth capacitor C5, the fourth resistor R4, the seventh resistor R7, the first diode D1 and the switch SW1 are also turned on to form a second switch loop, the potential value of the first end of the seventh resistor R7 is again decreased, the potential value is the voltage division value of the seventh resistor R7 and the first diode D1 in the first switch loop, meanwhile, the fifth capacitor C5 starts to discharge through the second switch loop, the potential value of the first end of the fourth resistor R4 is made equal to the potential value of the first end of the seventh resistor R7, the voltage difference between the control end G and the first end S of the first switch tube Q1 is increased, and the first switch tube Q1 is restored or kept in a conducting 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 loop through the fourteenth resistor R14, the second diode D2 and the switch SW1, the potential value of the second end of the fourteenth resistor R14 is pulled down from the original high level to a low level, which is the on-state voltage value when the second diode D2 is turned on, and meanwhile, the electric energy stored in the eleventh capacitor C11 is discharged through the fifteenth resistor R15, the second diode D2 and the switch SW 1. At the moment, the potential at the trigger input end I of the single chip microcomputer is reduced to be low level, and the single chip microcomputer modifies the flag bit stored locally according to the low level so as to update the flag bit to be the flag bit corresponding to the starting signal. The single chip microcomputer converts the electric potential output by the locking output end O with the original low output level into a high level according to the flag bit, the high level controls the conduction of the second switch tube Q2, and the conduction state of the first switch tube Q1 is adjusted and maintained according to the conducted second switch tube Q2, so that the single chip microcomputer continuously obtains the power supply voltage VCC, wherein the process that the locking output end O outputs the electric potential of the high level until the single chip microcomputer obtains the power supply voltage VCC is explained, and the process is not repeated herein.

When the switch SW1 of the switch unit 26 receives the pressing operation signal during the operation of the power unit 24, the switch unit SW1 is turned on while the switch SW1 is pressed. The first trigger circuit is conducted again in the same process as the loop generation and voltage change, the electric potential at the trigger input end I of the single chip microcomputer is changed into low level again, and the single chip microcomputer modifies the flag bit stored locally according to the low level to update the flag bit to the flag bit corresponding to the shutdown signal. The single chip microcomputer converts the electric potential output by the locking output end O with the original high output level into the low level according to the zone bit, updates the zone bit stored locally to a preset interrupt value, and stores the operation parameter at the current moment. During the storage process, the ninth capacitor C9 starts to discharge to ensure that the voltage value at the first end of the second resistor R2 does not change to the low level rapidly when the output potential of the latch output terminal O is at the low level, but divides the continuously decreasing voltage value of the first terminal of the ninth capacitor C9 according to the second resistor R2 and the sixth resistor R6 to obtain a continuously decreasing voltage, during the voltage drop of the first end of the second resistor R2, the voltage difference between the control end B and the second end E of the second switch tube Q2 is gradually reduced, when the voltage difference is smaller than a first voltage difference threshold value of the opening of the second switch tube Q2, the second switch tube Q2 is closed, a loop formed by the first resistor R1, the seventh resistor R7 and the second switch tube Q2 is disconnected, at the moment, 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 charging the fifth capacitor C5 through the first resistor R1 and the fourth resistor R4. When the voltage of the first end of the fourth resistor R4 rises until the voltage difference between the control end G and the first end S of the first switch tube Q1 is smaller than the second voltage difference threshold, the first switch tube Q1 is turned off, and the power utilization unit 24 and the second control unit 23 no longer obtain electric energy, so as to block standby power consumption. In the process that the switch SW1 generates the switch signal until the power consumption unit 24 no longer receives the electric energy, the charging of the fifth capacitor C5 and the discharging of the eleventh capacitor C11 provide the time for the single chip microcomputer to store the operation parameters and update the flag bit.

In the power utilization process, if the power VCC _ BUS is disconnected from the external power supply, the voltage of the power VCC _ BUS is continuously decreased, the voltage of the second terminal D of the first switch tube Q1 is also decreased, and the output voltage of the first voltage conversion unit T1 is also continuously decreased. When the singlechip monitors the voltage signal which is continuously reduced, the flag bit stored locally starts to be updated to a preset interrupt value, and the running parameter at the current moment starts to be stored. When the voltage received by the single chip microcomputer begins to drop, the output level of the locking output end O of the single chip microcomputer also begins to decrease, the potential value of the control end B of the second switching tube Q2 is reduced along with the decrease, the voltage difference between the control end B and the second end E of the second switching tube Q2 is reduced, the second switching tube Q2 is turned off, the potential of the first end of the seventh resistor R7 begins to rise to cause the first switching tube Q1 to be turned off, and the first voltage conversion unit T1 stops supplying power to the single chip microcomputer and the trigger unit 25. In order to delay the turn-off time point of the second switching tube Q2 and thus prolong the power supply time of the first voltage conversion unit T1, the ninth capacitor C9 starts to discharge to supply power to the second resistor R2, the sixth resistor R6 and the second switching tube Q2, so as to suppress the falling speed of the potential of the control terminal of the second switching tube Q2 and thus prolong the turn-on time of the second switching tube Q2.

In the technical scheme, the adjustment of the conducting state of the first switch tube is realized by controlling the charging and discharging operations of the capacitor in the electrifying unit connected with the first switch tube, in addition, the capacitor in the second control unit is combined with the capacitor in the power-on unit to delay the power-off state of the power utilization unit when the power utilization unit monitors the power-off state or receives a power-off instruction in the running process, the controllable power supply stops the power supply operation of the power utilization unit, provides processing time for the power utilization unit to store the operation parameters and update the corresponding zone bit, the power utilization unit can continuously operate according to the stored operation parameters when receiving the electric energy again, and therefore the continuity of the operation process of the household appliance before and after the power supply circuit is powered off is improved.

Other embodiments of the present application will be 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 the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. 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 will be understood that the present application is not limited to the precise arrangements described above and shown in the 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

1. A power supply circuit, comprising:

a first control unit, provided with a first terminal and a control terminal, the first terminal of which is connected to the control terminal of the controllable power supply, and configured to generate the first on signal under control of a first control signal, the second on signal under control of a second control signal, and the off signal under control of a third control signal;

the first control unit is used for generating a first control signal when the power utilization unit outputs a power supply starting signal, and is also used for sequentially generating a second control signal and a third control signal when the power utilization unit outputs a power supply closing signal; wherein the power-off signal is generated when the voltage generated by the power unit at the locking end is less than a threshold voltage.

2. The power supply circuit of claim 1, wherein the circuit further comprises:

the trigger unit is provided with an output end, the output end of the trigger unit is connected with the trigger end of the power utilization unit, and the trigger unit is used for receiving a switching signal and generating a trigger signal according to the switching signal;

the power utilization unit is used for generating the power supply starting signal according to the trigger signal when the locally stored flag bit is a starting signal;

and the power utilization unit is used for generating the power supply closing signal according to the trigger signal when the locally stored flag bit is a shutdown signal.

3. The power supply circuit of claim 2, wherein the circuit further comprises:

4. A power supply circuit as claimed in any one of claims 1 to 3, characterized in that the circuit further comprises:

the pre-conducting unit is connected to the second end of the first control unit and the first end of the switch unit, and is used for controlling the first control unit to output a third opening signal when receiving a switch signal;

5. A power supply circuit as claimed in any one of claims 1 to 3, characterized in that the circuit further comprises:

6. A power supply circuit as claimed in any one of claims 1 to 3, characterized in that the controllable power supply comprises:

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

or

7. The power supply circuit according to any one of claims 1 to 3, wherein the first control unit includes:

the first end of the first resistor is connected with a power supply, and the second end of the first resistor is connected with the control end of the controllable power supply;

8. The power supply circuit according to any one of claims 1 to 3, wherein the second control unit includes:

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

9. The power supply circuit according to any one of claims 1 to 3, wherein the trigger unit includes:

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

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

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

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

10. A power supply circuit according to any one of claims 1 to 3, wherein the power-on unit comprises:

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