CN217904036U - Power supply circuit and electronic equipment - Google Patents

Abstract

The utility model provides a power supply circuit and electronic equipment, which relate to the technical field of circuits. The power supply circuit includes a backstop circuit, a backstop circuit controller and a controller enabling drive module; the controller enables the driving module, connected to the backstop circuit controller, for detecting the electrical parameters of the load and driving the backstop circuit based on the electrical parameters The enable of the controller is turned on or off; the backstop circuit controller, connected to the backstop circuit, is used to detect the input terminal voltage and output terminal voltage of the backstop circuit, and control based on the input terminal voltage and output terminal voltage of the backstop circuit On or off of the backstop circuit; the backstop circuit is used to connect between the power supply unit and the load, and the backstop circuit can prevent reverse current when it is in the cut-off state. The utility model can avoid current backfeeding, and at the same time, can avoid excessive power consumption of the circuit caused by the backstop circuit controller being always in the working state, and prolongs the battery life of the power supply unit in the electronic equipment where the power supply circuit is located.

Description

A power supply circuit and electronic equipment

technical field

The utility model relates to the technical field of circuits, in particular to a power supply circuit and electronic equipment.

Background technique

The existing power supply circuit usually adds an anti-backflow circuit between the power supply terminal and the load terminal in order to prevent the load terminal from pouring current back to the power supply terminal with a lower voltage. However, adding an anti-backflow circuit will easily lead to higher power consumption of the power supply circuit and shorten It determines the life time of the power supply in the electronic equipment where the power supply circuit is located. Therefore, how to prolong the power supply life while preventing current backflow has become an urgent problem to be solved.

Utility model content

In view of this, the purpose of this utility model is to provide a power supply circuit and electronic equipment, which can avoid the occurrence of current backflow, and at the same time can avoid the excessive power consumption of the circuit caused by the backstop circuit controller being always in the working state, and prolong the power supply circuit. The battery life of a power supply unit in an electronic device.

In order to achieve the above object, the technical scheme that the utility model embodiment adopts is as follows:

In the first aspect, the embodiment of the present invention provides a power supply circuit, including: a backstop circuit, a backstop circuit controller, and a controller enabling drive module; the controller enabling drive module is connected to the backstop The circuit controller is used to detect the electrical parameter of the load and drive the enabling of the backstop circuit controller to be turned on or off based on the electrical parameter; the backstop circuit controller is connected to the backstop circuit, It is used to detect the input terminal voltage and the output terminal voltage of the non-return circuit, and control the conduction or cut-off of the non-return circuit based on the input terminal voltage and the output terminal voltage of the non-return circuit; the non-return circuit, It is used to be connected between the power supply unit and the load, and the reverse current can be prevented when the check circuit is in the cut-off state.

Optionally, the electrical parameter is current, and the controller enables the driving module to detect the current of the load, and when the current of the load is less than a preset threshold, the controller enables the driving module to turn off the inverter When the current of the load is greater than the preset threshold, the controller enables the drive module to turn on the enabling of the backstop circuit controller.

Optionally, the check circuit is a field effect transistor.

Optionally, the backstop circuit controller is a comparator or an analog-to-digital converter; the backstop circuit controller is used to control the backstop circuit to be in the In an off state, the check circuit is controlled to be in a conduction state when the voltage at the output terminal of the check circuit is lower than the voltage at the input terminal.

Optionally, the backstop circuit controller is a first comparator, the first input end of the first comparator is connected to the input end of the backstop circuit, and the second input end of the first comparator connected to the output terminal of the check circuit, and the output terminal of the first comparator is connected to the control terminal of the check circuit.

Optionally, the power supply circuit further includes a sampling resistor, and the controller enables the drive module to include a second comparator and a reference circuit; the sampling resistor is used to connect to the load; the second comparator’s first An input terminal is connected between the load and the sampling resistor; the second input terminal of the second comparator is connected to the reference circuit, and the reference circuit is used to provide the second input terminal of the second comparator The input end is input with a reference voltage; the output end of the second comparator is connected to the backstop circuit controller.

Optionally, the reference circuit includes a first resistor and a second resistor; the first end of the first resistor is used to connect to a preset power supply, the second end of the first resistor and the second end of the second resistor The second end is commonly connected to the second input end of the second comparator, and the second end of the second resistor is grounded.

Optionally, the power supply circuit includes a plurality of the backstop circuits and a plurality of the backstop circuit controllers, and the plurality of the backstop circuits are respectively used to be connected to a plurality of the power supply units; The stop circuit controller is respectively used to control the conduction or cut-off of multiple said backstop circuits; The enables of the circuit controllers are either on or off at the same time.

On the other hand, an embodiment of the present utility model provides an electronic device, including: a power supply unit, a load, and the power supply circuit described in any one of the first aspects, and the check circuit in the power supply circuit is used to connect to the between the power supply unit and the load.

Optionally, the electronic device is an intelligent door lock, and the load includes any one or more of a drive motor, a touch panel, a speaker, a controller, and a camera.

The embodiment of the utility model provides a power supply circuit and electronic equipment, the power supply circuit includes a backstop circuit, a backstop circuit controller and a controller enabling drive module; the controller enabling drive module is connected to the backstop circuit controller, Used to detect the electrical parameters of the load and drive the enable of the backstop circuit controller to open or close based on the electrical parameters; the backstop circuit controller is connected to the backstop circuit and used to detect the input terminal voltage and output terminal voltage of the backstop circuit , and control the turn-on or cut-off of the backstop circuit based on the input terminal voltage and the output terminal voltage of the backstop circuit; to the current. In the embodiment of the utility model, by setting a backstop circuit between the power supply unit and the load, the on-off state of the power supply circuit can be controlled based on the backstop circuit controller, which can prevent the reverse current from occurring, and at the same time enable the drive module based on the controller Drive the enable of the backstop circuit controller, so that the backstop circuit controller is in a controllable state, avoiding the excessive power consumption of the circuit caused by the backstop circuit controller being in the working state all the time, saving energy consumption, and prolonging the electronic life of the power supply circuit. The battery life of the device.

Other features and advantages of the embodiments of the present invention will be set forth in the subsequent description, or some of the features and advantages can be inferred from the description or determined without doubt, or can be known by implementing the above-mentioned techniques of the embodiments of the present invention .

In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 shows a schematic structural diagram of an electronic device provided by an embodiment of the present invention;

Fig. 2 shows a schematic structural diagram of a power supply circuit provided by an embodiment of the present invention;

Fig. 3 shows a schematic structural diagram of another power supply circuit provided by the embodiment of the present invention;

Fig. 4 shows a schematic diagram of a power supply circuit provided by an embodiment of the present invention;

Fig. 5 shows a schematic diagram of another power supply circuit provided by the embodiment of the present invention;

Fig. 6 shows a schematic diagram of another power supply circuit provided by the embodiment of the present invention.

Detailed ways

The technical solution of the present application will be further elaborated below in combination with the accompanying drawings and specific embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the description of the application are only for the purpose of describing specific embodiments, and are not intended to limit the implementation of the application.

In the description of the present application, unless otherwise specified, "plurality" means two or more. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

The power supply circuit provided by the embodiment of the present invention can be applied to electronic equipment. Avoiding the reverse flow of current to the power supply with lower voltage can reduce the power consumption of electronic equipment, prolong the battery life of the power supply, and improve the utilization rate of power supply.

In one embodiment, referring to the schematic structural diagram of an electronic device as shown in FIG. It is used to be connected between the power supply unit 100 and the load 300 so that the power supply unit 100 can provide electric energy for the load 300 . The above-mentioned power supply unit may be a storage battery or a dry battery, and the number of batteries may be one or more.

In one embodiment, the above-mentioned electronic device is an intelligent door lock, the above-mentioned power supply unit can be a dry battery pack in the intelligent door lock, and the power supply circuit connects the dry battery pack to each load in the intelligent door lock, so that the intelligent door lock can save energy. consumption.

In one embodiment, the load in the above smart door lock may be any one or more of a drive motor, a touch panel, a speaker, a controller and a camera.

In one embodiment, in order to save energy consumption of the circuit, a power supply circuit is provided. Referring to the schematic structural diagram of the power supply circuit shown in FIG. Enable the driver module 203 .

The controller enable driving module 203 is connected to the backstop circuit controller 202 and is used to detect the electrical parameters of the load 300 and drive the backstop circuit controller 202 to be enabled or closed based on the electrical parameters. The electrical parameter mentioned above may be the current or voltage of the load. The controller enabling drive module 203 can detect the load status by detecting the electrical parameter of the load, so as to control the enable of the backstop circuit controller 202 according to the load status.

If under the current load state, it is necessary to make the backstop circuit controller 202 control the conduction or cut-off of the backstop circuit 201, then the enabling of the backstop circuit controller 202 is controlled to be opened; In the cut-off state, the enable of the backstop circuit controller 202 is controlled to be turned off. In a feasible implementation manner, when the load is in the first state, the enable control of the backstop circuit controller 202 is turned on; when the load is in the second state, the enable control of the backstop circuit controller 202 is turned off. The foregoing first state and second state may be states corresponding to when the current or voltage of the load is in different ranges.

The backstop circuit controller 202, connected to the backstop circuit 201, is used to detect the input terminal voltage and the output terminal voltage of the backstop circuit 201, and control the backstop circuit 201 based on the input terminal voltage and the output terminal voltage of the backstop circuit 201 on or off. When the enable of the backstop circuit controller 202 is turned on, the backstop circuit controller 202 controls the conduction or cut-off of the backstop circuit 201 according to the magnitude relationship between the input terminal voltage and the output terminal voltage of the backstop circuit 201, when the backstop circuit When 201 needs to perform current backflow prevention control, the backstop circuit controller 202 controls the backstop circuit 201 to stop. The above-mentioned backstop circuit controller 202 may be an integrated control chip, or a circuit constructed by discrete components, including an operational amplifier comparator, a logic control circuit, and the like.

The backstop circuit 201 is configured to be connected between the power supply unit 100 and the load 300 , and the backstop circuit 201 can prevent reverse current when it is in a cut-off state. Since the backstop circuit 201 can prevent reverse current when it is in the off state, by disposing the backstop circuit 201 between the power supply unit 100 and the load 300 , current backflow can be avoided.

The above-mentioned power supply circuit provided in this embodiment can control the on-off state of the power supply circuit based on the backstop circuit controller by setting the backstop circuit between the power supply unit and the load, and can prevent the reverse current from occurring, and at the same time through the backstop circuit based on the controller The enable drive module drives the enable of the backstop circuit controller, so that the backstop circuit controller is in a controllable state, avoiding the excessive power consumption of the circuit caused by the backstop circuit controller being always in the working state, saving energy consumption and prolonging the The power life of the electronic device where the power supply circuit is located.

In one embodiment, referring to another schematic structural diagram of a power supply circuit as shown in FIG. To a plurality of power supply units 100; a plurality of backstop circuit controllers 202 are respectively used to control the conduction or cut-off of a plurality of backstop circuits 201; the controller enables the drive module 203 to be connected to a plurality of backstop circuit controllers 202 at the same time The enablement of driving multiple backstop circuit controllers 202 is turned on or turned off at the same time.

In order to ensure the reliability of power supply, the above-mentioned electronic equipment may include a plurality of power supply units 100, each power supply unit 100 is connected to the load 300 through a backstop circuit 201, and each backstop circuit 201 is connected to a corresponding backstop circuit controller 202 , by controlling the on and off of each of the backstop circuits 201 based on each of the backstop circuit controllers 202 , the power supply current to the load 300 can be controlled to ensure the normal operation of the load 300 . The output terminals of the controller enabling drive module 203 are respectively connected to each backstop circuit controller 202, so that each backstop circuit controller 202 shares one controller enabling drive module 203, so as to simultaneously control each backstop circuit control according to the load status. The enable of device 202 is turned on or off.

In the smart door lock application, two or more sets of dry batteries are usually used to supply power to the load at the same time. The backstop circuit controller 202 will be placed in the main board of the door lock. 202 is in the closed state. When the door lock enters a high-current working state, such as when the motor rotates, the speaker plays sound, and the face recognition module works, the controller enables the drive module 203 to detect changes in the current, and then controls to open the backstop circuit controller. 202.

In one embodiment, the above-mentioned electrical parameter is current, and the controller enables the driving module 203 to detect the current of the load 300. When the current of the load 300 is less than a preset threshold, the controller enables the driving module 203 to turn off the backstop circuit control The controller 202 is enabled, and when the current of the load 300 is greater than the preset threshold, the controller enables the drive module 203 to enable the controller 202 of the backstop circuit.

The above-mentioned preset threshold value may be a value between the operating current value and the standby current value of the load. When the controller enables the drive module 203 to detect that the current of the load 300 is small, it determines that the load is in the standby state, and drives the backstop circuit controller 202 The enabling of the backstop circuit controller 202 usually uses a high-bandwidth operational amplifier comparator, which will generate a large quiescent current and cause a large power loss to the dry battery power supply. The number of the backstop circuit controller 202 The more the power consumption is, the greater the power consumption will be. If the backstop circuit controller 202 is always on, it will increase the power consumption of the power supply circuit and reduce the power supply life time. By driving the backstop circuit controller 202 to enable and close, the power supply circuit can be reduced. power consumption, prolonging the battery life of the power supply unit.

When the controller enables the drive module 203 to detect that the load 300 has a large current, it determines that the load is in the working state, and the backstop circuit controller 202 is enabled to be opened by driving the backstop circuit controller 202, so that the backstop circuit controller 202 is in the working state, and then the load is in the working state. The backstop circuit controller 202 switches the on and off states of the backstop circuit 201 according to the relationship between the input terminal voltage and the output terminal voltage of the backstop circuit 201 , so as to avoid current backflow.

In one embodiment, the above-mentioned backstop circuit 201 may include a field effect transistor. The field effect transistor MOSFET (MOS tube) has a very small forward voltage drop when it is turned on, and there is only a voltage drop of tens of mV when a large current passes through it, and the field effect transistor MOSFET has the ability to block reverse current when it is turned off , the backstop circuit 201 can be set by utilizing the characteristics of the MOS tube. The aforementioned field effect transistors may be N-type field effect transistors or N-type field effect transistors.

In a feasible implementation manner, when the backstop circuit 201 is a field effect transistor, referring to the schematic diagram of the power supply circuit shown in FIG. , the drain 401B of the field effect transistor Q1 is connected to the power supply unit 100 , and the source 401C of the field effect transistor Q1 is connected to the load 300 .

Since there is a body diode inside the field effect tube (the body diode can be considered as an ordinary diode), even when the field effect tube is in the off state, the body diode still exists, and the current passes through the body diode to supply power to the load terminal; when the field effect tube is in the conduction state In the on state, the current passes through the drain and source of the field effect transistor with a lower impedance, and short-circuits the diode in the field effect transistor. At this time, the field effect transistor can be regarded as an ideal diode. By connecting the field effect transistor Q1 between the power supply unit and the load, the above-mentioned characteristics of the field effect transistor can be used to switch between an ordinary diode and an ideal diode.

In one embodiment, the backstop circuit controller 202 is a comparator or an analog-to-digital converter. As shown in FIG. Pole 401B is connected.

The backstop circuit controller 202 is used to control the backstop circuit 201 to be in the cut-off state when the output voltage of the backstop circuit 201 is greater than the input voltage, and to control the backstop circuit 202 when the output voltage of the backstop circuit 201 is lower than the input voltage. is in the conduction state.

When the backstop circuit controller 202 detects that the output terminal voltage of the backstop circuit 201 is greater than the input terminal voltage, the field effect transistor Q1 is controlled to be in the off state, and the field effect transistor Q1 has the ability to block reverse current when it is in the off state, so that it can Prevent current backflow. When the backstop circuit controller 202 detects that the voltage at the output terminal of the backstop circuit 201 is lower than the voltage at the input terminal, it controls the field effect transistor Q1 to be in the conduction state, and the voltage drop generated when the field effect transistor Q1 is turned on is small. When the power supply circuit When the electronic device includes multiple power supply units, the field effect transistor connected to the power supply unit with higher voltage is turned on, so that the power supply unit with higher voltage supplies power to the load.

In one embodiment, the above-mentioned backstop circuit controller is a first comparator, the first input terminal of the first comparator is connected to the input terminal of the backstop circuit, and the second input terminal of the first comparator is connected to the backstop circuit The output terminal of the first comparator is connected to the control terminal of the check circuit.

The above-mentioned first input terminal may be a positive phase terminal, and the second input terminal may be a negative phase terminal. When the voltage at the input terminal of the check circuit is greater than the voltage at the output terminal, the first comparator outputs a high level to the check circuit to control the check circuit. The circuit is in a conducting state, and when the voltage at the input terminal of the non-return circuit is lower than the voltage at the output terminal, a low level is output to the non-return circuit to control the non-return circuit to be in a cut-off state and avoid current backflow.

In a feasible implementation manner, referring to another schematic diagram of a power supply circuit shown in FIG. 5, the non-inverting terminal 501A of the first comparator U1 is connected to the source 401B of the field effect transistor Q1; The negative phase terminal 501B is connected to the drain 401C of the field effect transistor Q1, the output terminal 501C of the first comparator U1 is the output terminal of the backstop circuit controller 302, the output terminal 501C of the first comparator U1 is connected to the output terminal of the field effect transistor Q1 The control terminal is connected to the gate 401A.

The first comparator U1 outputs a high level when the voltage at the positive phase terminal 501A is greater than the voltage at the negative phase terminal 501B, so as to drive the field effect transistor Q1 to be in a conduction state. At this time, the voltage drop is small. When the electronic device includes multiple When the power supply unit is used, the field effect transistor connected to the power supply unit with higher voltage is turned on to supply power to the load; when the voltage of the positive phase terminal 501A is lower than the voltage of the negative phase terminal 501B, a low level is output to control the field effect transistor Q1 in In the cut-off state, current backflow can be prevented at this time.

In one embodiment, referring to another schematic diagram of a power supply circuit shown in FIG. 6 , the power supply circuit further includes a sampling resistor R0 , and the controller enabling driving module includes a second comparator U2 and a reference circuit 601 .

As shown in Figure 6, the sampling resistor R0 is used to connect to the load 300; the first input terminal of the second comparator U2 is connected between the load 300 and the sampling resistor R0; the second input terminal of the second comparator U2 is connected to the reference Circuit 601 , the reference circuit 601 is used to input a reference voltage to the second input terminal of the second comparator U2 ; the output terminal of the second comparator U2 is connected to the backstop circuit controller 202 . The first input terminal of the second comparator U2 may be a positive phase terminal, and the second input terminal of the second comparator U2 may be a negative phase terminal.

By connecting the first input terminal of the second comparator U2 between the load 300 and the sampling resistor R0, the voltage at the first input terminal of the second comparator U2 increases when the load current increases. When the load current is greater than the preset threshold, the voltage at the first input terminal of the second comparator U2 is greater than the voltage at the second input terminal, and the output terminal of the second comparator U2 outputs a high level to drive the backstop circuit controller 202 to enable Can be opened; when the load current is less than the preset threshold, the voltage of the first input terminal of the second comparator U2 is lower than the voltage of the second input terminal, and the output terminal of the second comparator U2 outputs a low level to drive the backstop circuit controller The enable of 202 is closed.

In a feasible implementation manner, the output terminal of the second comparator U2 can be connected to the enable port or the power supply control terminal of the backstop circuit controller 202, and when the output terminal of the second comparator U2 outputs a high level, the The backstop circuit controller 202 is powered on and enters the working state; when the output terminal of the second comparator U2 outputs a low level, the backstop circuit controller 202 cannot be powered on to stop working.

In one embodiment, as shown in FIG. 6, the reference circuit includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is used to connect to a 3.3V preset power supply, and the second end of the first resistor R1 end and the second end of the second resistor R2 are jointly connected to the second input end of the second comparator U2, and the second end of the second resistor R2 is grounded. The above-mentioned preset power supply only needs to be a 3.3V power supply, which can be obtained by dividing the voltage by 100 from the power supply unit, or can be a 3.3V power supply provided separately in the electronic device. The resistance values of the first resistor R1 and the second resistor R2 are related to the preset threshold of the load current.

When the controller enables the drive module 203 to detect that the current of the load 300 is less than the preset threshold, it indicates that the load in the electronic device is in a low-power standby state, and the controller enables the drive module 203 to drive the enable of the backstop circuit controller 202 Closed, the backstop circuit controller 202 is in the off state, the backstop circuit 201 is in the cut-off state, the power supply unit supplies power to the system through the body diode of the field effect transistor MOSFET, the body diode can be considered as a common diode, and the overall current of the power supply circuit is small at this time , so the voltage drop generated by the body diode is also relatively small, which is equivalent to a common diode connected behind the power supply unit, and the power consumption is relatively small.

When the controller enables the drive module 203 to detect that the current of the load 300 is greater than the preset threshold, that is, the load in the electronic device is in a high current working state (such as the smart door lock motor rotates, the speaker plays sound or the camera starts to capture images), The controller enables the drive module 203 to drive the enable of the backstop circuit controller 202 to open, so that the backstop circuit controller 202 controls the field effect transistor Q1 to be in the on or off state: when the enable of the backstop circuit controller 202 is in When in the open state, if the drain input voltage of the field effect transistor Q1 is greater than the source output voltage, the check circuit controller 202 drives the field effect transistor Q1 to conduct, and at this time the field effect transistor Q1 is similar to an ideal diode, and the generated voltage drop is relatively small small, which reduces the power consumption of the circuit; if the drain input voltage of the field effect transistor Q1 is lower than the source output voltage, the check circuit controller 202 drives the field effect transistor Q1 to cut off to prevent current backflow.

The above power supply circuit can enable the controller to enable the drive module to automatically drive the enable of the backstop circuit controller according to the change of the load terminal current, and can also make the backstop circuit in the Switching between ordinary diodes and ideal diodes reduces the power consumption of the circuit and prolongs the battery life of the power supply.

It should be noted that at last: the above-described embodiment is only the specific implementation manner of the present utility model, in order to illustrate the technical scheme of the present utility model, rather than it is limited, and the protection scope of the present utility model is not limited thereto, Although the utility model has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any person familiar with the technical field can still describe the aforementioned embodiments within the technical scope disclosed in the utility model. Modifications or changes can be easily imagined in the technical solutions, or equivalent replacement of some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. All should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. A power supply circuit, characterized in that, comprising: a backstop circuit, a backstop circuit controller and a controller enabling drive module; The controller enabling drive module, connected to the backstop circuit controller, is used to detect the electrical parameters of the load and drive the enable of the backstop circuit controller on or off based on the electrical parameters; The backstop circuit controller, connected to the backstop circuit, is used to detect the input terminal voltage and the output terminal voltage of the backstop circuit, and control the The conduction or termination of the non-return circuit; The backstop circuit is used to be connected between the power supply unit and the load, and the backstop circuit can prevent reverse current when the backstop circuit is in a cut-off state. 2. The power supply circuit according to claim 1, wherein the electrical parameter is current, the controller enables the drive module to detect the load current, and when the load current is less than a preset threshold, The controller enables the drive module to turn off the enable of the backstop circuit controller, and when the load current is greater than the preset threshold, the controller enables the drive module to turn on the backstop circuit controller enabling. 3. The power supply circuit according to claim 1, wherein the check circuit is a field effect transistor. 4. The power supply circuit according to any one of claims 1-3, wherein the backstop circuit controller is a comparator or an analog-to-digital converter; The backstop circuit controller is used to control the backstop circuit to be in a cut-off state when the output voltage of the backstop circuit is greater than the input voltage, and to control the backstop circuit to be in a cut-off state when the output voltage of the backstop circuit is lower than the input voltage The non-return circuit is in conduction state. 5. The power supply circuit according to claim 4, wherein the backstop circuit controller is a first comparator, the first input end of the first comparator is connected to the input end of the backstop circuit , the second input end of the first comparator is connected to the output end of the backstop circuit, and the output end of the first comparator is connected to the control end of the backstop circuit. 6. The power supply circuit according to claim 1 or 2, wherein the power supply circuit further comprises a sampling resistor, and the controller enabling drive module comprises a second comparator and a reference circuit; The sampling resistor is used to connect to the load; The first input terminal of the second comparator is connected between the load and the sampling resistor; The second input terminal of the second comparator is connected to the reference circuit, and the reference circuit is used to input a reference voltage to the second input terminal of the second comparator; The output end of the second comparator is connected to the backstop circuit controller. 7. The power supply circuit according to claim 6, wherein the reference circuit comprises a first resistor and a second resistor; The first end of the first resistor is used to connect to a preset power supply, and the second end of the first resistor and the second end of the second resistor are jointly connected to the second input end of the second comparator , the second end of the second resistor is grounded. 8. The power supply circuit according to claim 1, characterized in that, the power supply circuit comprises a plurality of said backstop circuits and a plurality of said backstop circuit controllers, and a plurality of said backstop circuits are respectively used for connecting To a plurality of said power supply units; a plurality of said backstop circuit controllers are respectively used to control the conduction or cut-off of a plurality of said backstop circuits; said controller enables the drive module to communicate with a plurality of said backstop circuits The controller is connected so as to drive the enablement of multiple backstop circuits to be turned on or turned off at the same time. 9. An electronic device, characterized in that it comprises: a power supply unit, a load and the power supply circuit according to any one of claims 1-8, the check circuit in the power supply circuit is used to connect the power supply unit and the between the loads. 10. The electronic device according to claim 9, wherein the electronic device is an intelligent door lock, and the load includes any one or more of a drive motor, a touch panel, a speaker, a controller, and a camera .

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