CN217904036U - Power supply circuit and electronic equipment - Google Patents

Abstract

The utility model provides a supply circuit and electronic equipment relates to circuit technical field. The power supply circuit comprises a non-return circuit, a non-return circuit controller and a controller enabling driving module; the controller enabling driving module is connected to the non-return circuit controller and used for detecting the electrical parameters of the load and driving the enabling of the non-return circuit controller to be opened or closed based on the electrical parameters; the non-return circuit controller is connected with the non-return circuit and used for detecting the voltage of the input end and the voltage of the output end of the non-return circuit and controlling the on-off of the non-return circuit based on the voltage of the input end and the voltage of the output end of the non-return circuit; and the non-return circuit is connected between the power supply unit and the load and can prevent reverse current when the non-return circuit is in a cut-off state. The utility model discloses can avoid appearing the electric current and flow backward, can avoid contrary circuit controller to be in operating condition all the time and lead to the circuit consumption too big simultaneously, prolong power supply unit's duration in the electronic equipment of supply circuit place.

Description

Power supply circuit and electronic equipment

Technical Field

The utility model belongs to the technical field of the circuit technique and specifically relates to a supply circuit and electronic equipment is related to.

Background

In order to prevent a load end from flowing backward to a power end with lower voltage, a reverse flow prevention circuit is generally added between the power end and the load end in the conventional power supply circuit, but the power consumption of the power supply circuit is high due to the addition of the reverse flow prevention circuit, and the endurance time of a power supply in an electronic device where the power supply circuit is located is shortened. Therefore, how to prolong the endurance time of the power supply while preventing the current from flowing backwards becomes an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a supply circuit and electronic equipment can avoid appearing the electric current and flow backward, can avoid contrary circuit control ware that ends to be in operating condition all the time and lead to the circuit consumption too big simultaneously, has prolonged supply circuit place electronic equipment in the time of endurance of electrical unit.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, an embodiment of the present invention provides a power supply circuit, including: the device comprises a non-return circuit, a non-return circuit controller and a controller enabling driving module; the controller enabling driving module is connected to the non-return circuit controller and used for detecting the electrical parameter of the load and driving enabling of the non-return circuit controller to be opened or closed based on the electrical parameter; the non-return circuit controller is connected with the non-return circuit and is used for detecting the voltage of the input end and the voltage of the output end of the non-return circuit and controlling the non-return circuit to be switched on or switched off based on the voltage of the input end and the voltage of the output end of the non-return circuit; the non-return circuit is connected between the power supply unit and the load and can prevent reverse current when being in a cut-off state.

Optionally, the electrical parameter is a current, the controller enabling driving module is configured to detect a current of the load, when the current of the load is smaller than a preset threshold, the controller enabling driving module closes the enabling of the check circuit controller, and when the current of the load is larger than the preset threshold, the controller enabling driving module opens the enabling of the check circuit controller.

Optionally, the non-return circuit is a field effect transistor.

Optionally, the non-return circuit controller is a comparator or an analog-digital converter; the non-return circuit controller is used for controlling the non-return circuit to be in a cut-off state when the voltage of the output end of the non-return circuit is larger than the voltage of the input end, and controlling the non-return circuit to be in a conducting state when the voltage of the output end of the non-return circuit is smaller than the voltage of the input end.

Optionally, contrary circuit controller is first comparator, the first input of first comparator connect in contrary circuit's input, the second input of first comparator connect in contrary circuit's output, the output of first comparator connect in contrary circuit's control end.

Optionally, the power supply circuit further includes a sampling resistor, and the controller enable driving module includes a second comparator and a reference circuit; the sampling resistor is used for being connected to the load; the first input end of the second comparator is connected between the load and the sampling resistor; the second input end of the second comparator is connected to the reference circuit, and the reference circuit is used for inputting a reference voltage to the second input end of the second comparator; and the output end of the second comparator is connected with the non-return circuit controller.

Optionally, the reference circuit comprises a first resistor and a second resistor; the first end of the first resistor is used for being connected to a preset power supply, the second end of the first resistor and the second end of the second resistor are connected with the second input end of the second comparator together, and the second end of the second resistor is grounded.

Optionally, the power supply circuit includes a plurality of the check circuits and a plurality of the check circuit controllers, and the plurality of the check circuits are respectively used for being connected to the plurality of power supply units; the plurality of non-return circuit controllers are respectively used for controlling the conduction or the cut-off of the plurality of non-return circuits; the controller enables the driving module to be simultaneously connected with the plurality of the check circuit controllers so as to drive the plurality of the check circuit controllers to enable the check circuit controllers to be simultaneously opened or closed.

On the other hand, the embodiment of the utility model provides an electronic equipment, include: a power supply unit, a load and the power supply circuit of any one of the first aspect, wherein a non-return circuit in the power supply circuit is configured to be connected 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 driving motor, a touch pad, a speaker, a controller, and a camera.

The embodiment of the utility model provides a power supply circuit and electronic equipment, power supply circuit includes contrary circuit, contrary circuit control ware and controller enable drive module; the controller enabling driving module is connected with the non-return circuit controller and used for detecting the electrical parameters of the load and driving the enabling of the non-return circuit controller to be opened or closed based on the electrical parameters; the non-return circuit controller is connected with the non-return circuit and used for detecting the input end voltage and the output end voltage of the non-return circuit and controlling the non-return circuit to be switched on or switched off based on the input end voltage and the output end voltage of the non-return circuit; and the non-return circuit is connected between the power supply unit and the load and can prevent reverse current when the non-return circuit is in a cut-off state. The embodiment of the utility model provides a through set up contrary circuit at electrical unit and load, can be based on contrary circuit controller control supply circuit's on-off state, can prevent reverse current and avoid appearing the electric current and flow backward, simultaneously through the enable based on controller enable drive module drive contrary circuit controller, make contrary circuit controller be in controllable state, avoid contrary circuit controller to be in operating condition all the time and lead to the circuit consumption too big, the energy consumption is practiced thrift, the power duration of supply circuit place electronic equipment has been prolonged.

Other features and advantages of embodiments of the invention will be set forth in the description which follows, or in part may be learned by the description or may be learned by practice of the techniques of the embodiments.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

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

fig. 3 is a schematic diagram illustrating another power supply circuit structure provided by the embodiment of the present invention;

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

fig. 5 is 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 Description

The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of implementations of the present application.

In the description of the present application, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiment of the utility model provides an among the power supply circuit can be applied to electronic equipment, the power is connected to with the electric load through power supply circuit to for each power consumption load power supply among the electronic equipment, through setting up above-mentioned power supply circuit in electronic equipment, both can avoid the electric current to flow backward to the lower power of voltage in, can reduce electronic equipment's consumption again, long when prolonging the continuation of the journey of power, improve power utilization.

In an embodiment, referring to the schematic structural diagram of the electronic device shown in fig. 1, the embodiment provides an electronic device, including: the power supply system comprises a power supply unit 100, a load 300 and a power supply circuit 200, wherein a check circuit 201 in the power supply circuit 200 is used for being connected between the power supply unit 100 and the load 300 so as to enable the power supply unit 100 to supply power to the load 300. The power supply unit can be a storage battery or a dry battery, and the number of the batteries can be one or more.

In one embodiment, the electronic device is an intelligent door lock, the power supply unit may 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 intelligent door lock may be any one or more of a driving motor, a touch pad, a speaker, a controller and a camera.

In one embodiment, in order to save circuit power consumption, a power supply circuit is provided, referring to the schematic diagram of the power supply circuit shown in fig. 2, the power supply circuit 200 includes: a non-return circuit 201, a non-return circuit controller 202 and a controller enable driving module 203.

And the controller enabling driving module 203 is connected to the check circuit controller 202 and is used for detecting the electrical parameter of the load 300 and driving enabling of the check circuit controller 202 to be turned on or turned off based on the electrical parameter. The electrical parameter may be a current or a voltage of the load, and the controller enable driving module 203 may detect the load state by detecting the electrical parameter of the load, so as to control the enabling of the non-return circuit controller 202 according to the load state.

If the non-return circuit controller 202 needs to control the on or off of the non-return circuit 201 in the current load state, controlling the enable of the non-return circuit controller 202 to be opened; and if the non-return circuit 201 is required to be always in a non-return state in the current load state, controlling the enabling of the non-return circuit controller 202 to be closed. In one possible embodiment, when the load is in the first state, the enable of the check circuit controller 202 is controlled to be turned on; when the load is in the second state, the enable of the check circuit controller 202 is controlled to be closed. The first state and the second state may correspond to a state when the current or the voltage of the load is in different ranges.

And the non-return circuit controller 202 is connected to the non-return circuit 201 and is used for detecting the voltage at the input end and the voltage at the output end of the non-return circuit 201 and controlling the on-off of the non-return circuit 201 based on the voltage at the input end and the voltage at the output end of the non-return circuit 201. When the enable of the check circuit controller 202 is turned on, the check circuit controller 202 controls the on or off of the check circuit 201 according to the magnitude relation between the input end voltage and the output end voltage of the check circuit 201, and when the check circuit 201 needs to perform the current backflow prevention control, the check circuit controller 202 controls the check circuit 201 to be turned off. The non-return circuit controller 202 may be an integrated control chip, or may be a circuit built by discrete devices, including an operational amplifier comparator, a logic control circuit, and the like.

The non-return circuit 201 is connected between the power supply unit 100 and the load 300, and the non-return circuit 201 can stop reverse current when being in a cut-off state. Since the reverse current can be prevented when the reverse circuit 201 is in the off state, the reverse current can be prevented from flowing backward by disposing the reverse circuit 201 between the power supply unit 100 and the load 300.

The above-mentioned power supply circuit that this embodiment provided, through set up contrary circuit at power supply unit and load, can be based on contrary circuit controller control power supply circuit's on-off state, can prevent reverse current and avoid appearing the electric current backward flow, simultaneously through enabling based on controller messenger drive module drive contrary circuit controller, make contrary circuit controller be in controllable state, avoid contrary circuit controller to be in operating condition all the time and lead to the circuit consumption too big, the energy consumption has been practiced thrift, the power duration of the electronic equipment that power supply circuit belongs to has been prolonged.

In one embodiment, referring to another structural schematic diagram of the power supply circuit shown in fig. 3, the power supply circuit includes a plurality of check circuits 201 and a plurality of check circuit controllers 202, where the plurality of check circuits 201 are respectively used for being connected to the plurality of power supply units 100; the plurality of check circuit controllers 202 are respectively used for controlling the on/off of the plurality of check circuits 201; the controller enable driving module 203 is connected to the plurality of non-return circuit controllers 202 at the same time to drive the enables of the plurality of non-return circuit controllers 202 to be turned on or turned off at the same time.

In order to ensure the reliability of power supply, the electronic device may include a plurality of power supply units 100, each power supply unit 100 is connected to the load 300 through one check circuit 201, each check circuit 201 is connected to the corresponding check circuit controller 202, and by controlling the on and off of each check circuit 201 based on each check circuit controller 202, the power supply current to the load 300 may be controlled, and the normal operation of the load 300 may be ensured. The output ends of the controller enable driving module 203 are respectively connected with the respective non-return circuit controllers 202, so that the non-return circuit controllers 202 share one controller enable driving module 203, so as to simultaneously control the enabling of the non-return circuit controllers 202 to be opened or closed according to the load state.

In intelligent lock application, use 2 groups or multiunit dry batteries simultaneously for the load power supply usually, contrary circuit controller 202 that ends can arrange the lock mainboard in, when the lock was in low-power consumption standby state, contrary circuit controller 202 was in the closed condition, when the lock got into heavy current operating condition, for example the motor rotated, the speaker broadcast sound, during face identification module work, controller messenger drive module 203 detected the change of electric current, then control was opened contrary circuit controller 202 that ends.

In one embodiment, the electrical parameter is a current, the controller enable driving module 203 is configured to detect the current of the load 300, when the current of the load 300 is smaller than a preset threshold, the controller enable driving module 203 turns off the enable of the check circuit controller 202, and when the current of the load 300 is larger than the preset threshold, the controller enable driving module 203 turns on the enable of the check circuit controller 202.

The preset threshold may be a value between a working current value and a standby current value of the load, when the controller enable driving module 203 detects that the current of the load 300 is small, it is determined that the load is in a standby state, and the enable of the check circuit controller 202 is driven to be turned off, because the check circuit controller 202 generally uses a high-bandwidth operational amplifier comparator, a large static current is generated, a large electric energy loss is generated to the dry battery power supply, the power consumption is increased when the number of the check circuit controllers 202 is increased, if the check circuit controller 202 is always in an on state, the power consumption of the power supply circuit is increased, the power duration of the power supply is reduced, and the power consumption of the power supply circuit can be reduced and the duration of the power supply unit is prolonged by driving the enable of the check circuit controller 202 to be turned off.

When the controller enable driving module 203 detects that the current of the load 300 is large, it is determined that the load is in a working state, the enable of the non-return circuit controller 202 is driven to be opened, so that the non-return circuit controller 202 is in the working state, and further the non-return circuit controller 202 switches the on and off states of the non-return circuit 201 according to the relation between the input end voltage and the output end voltage of the non-return circuit 201, so as to avoid the occurrence of current backflow.

In one embodiment, the check circuit 201 may include a fet. The forward voltage drop of a field effect transistor MOSFET (MOS transistor) is very small when the MOSFET is switched on, the voltage drop of a large current is only dozens of mV when the large current passes through, the MOSFET has the capability of blocking reverse current when the MOSFET is switched off, and the non-return circuit 201 can be arranged by utilizing the characteristics of the MOS transistor. The field effect transistor can be an N-type field effect transistor or an N-type field effect transistor.

In one possible embodiment, when the non-return circuit 201 is a fet, referring to the schematic diagram of the power supply circuit shown in fig. 4, the gate 401A of the fet Q1 is connected to the output terminal of the non-return circuit controller 202, the drain 401B of the fet Q1 is connected to the power supply unit 100, and the source 401C of the fet Q1 is connected to the load 300.

Because a body diode (the body diode can be regarded as a common diode) can be regarded as being arranged in the field effect tube, the body diode exists even if the field effect tube is in a turn-off state, and current is supplied to a load end through the body diode; when the field effect transistor is in a conducting state, current passes through the drain electrode and the source electrode of the field effect transistor with lower impedance, and the diode in the field effect transistor is short-circuited, so that 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, it is possible to switch between a normal diode and an ideal diode by utilizing the above-described characteristics of the field effect transistor.

In one embodiment, the non-return circuit controller 202 is a comparator or an analog-to-digital converter, and as shown in fig. 4, the input terminals 402A and 402B of the non-return circuit controller 202 are connected to the source 401C and the drain 401B of the fet, respectively.

The check circuit controller 202 is configured to control the check circuit 201 to be in a cut-off state when the voltage of the output terminal of the check circuit 201 is greater than the voltage of the input terminal, and to control the check circuit 202 to be in a conduction state when the voltage of the output terminal of the check circuit 201 is less than the voltage of the input terminal.

When the non-return circuit controller 202 detects that the voltage of the output end of the non-return circuit 201 is greater than the voltage of the input end, the field effect transistor Q1 is controlled to be in a cut-off state, and the field effect transistor Q1 has the capability of blocking reverse current when being in the cut-off state, so that the current can be prevented from flowing backwards. When the non-return circuit controller 202 detects that the voltage of the output end of the non-return circuit 201 is smaller than that of the input end, the field effect tube Q1 is controlled to be in a conduction state, the voltage drop generated when the field effect tube Q1 is conducted is smaller, and when the electronic equipment where the power supply circuit is located comprises a plurality of power supply units, the field effect tube connected with the power supply unit with higher voltage is conducted, and then the power supply unit with higher voltage supplies power to a load.

In one embodiment, the non-return circuit controller is a first comparator, a first input terminal of the first comparator is connected to the input terminal of the non-return circuit, a second input terminal of the first comparator is connected to the output terminal of the non-return circuit, and an output terminal of the first comparator is connected to the control terminal of the non-return circuit.

The first input end can be a positive phase end, the second input end can be a negative phase end, the first comparator outputs high level to the non-return circuit when the voltage of the input end of the non-return circuit is larger than the voltage of the output end so as to control the non-return circuit to be in a conducting state, and outputs low level to the non-return circuit when the voltage of the input end of the non-return circuit is smaller than the voltage of the output end so as to control the non-return circuit to be in a stopping state and avoid backward flow of current.

In one possible embodiment, referring to another power supply circuit schematic diagram 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 end 501B of the first comparator U1 is connected to the drain 401C of the field effect transistor Q1, the output end 501C of the first comparator U1 is the output end of the non-return circuit controller 302, and the output end 501C of the first comparator U1 is connected to the control end gate 401A of the field effect transistor Q1.

When the voltage of the positive phase end 501A is higher than that of the negative phase end 501B, the first comparator U1 outputs a high level to drive the fet Q1 to be in a conducting state, and at this time, the voltage drop generated is small, and when the electronic device includes a plurality of power supply units, the fet connected to the power supply unit with a higher voltage is conducted to supply power to a 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 fet Q1 to be in an off state, and at this time, the current can be prevented from flowing backward.

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

As shown in fig. 6, the sampling resistor R0 is for connection to a load 300; a first input end of the second comparator U2 is connected between the load 300 and the sampling resistor R0; a second input end of the second comparator U2 is connected to the reference circuit 601, and the reference circuit 601 is configured to input a reference voltage to the second input end of the second comparator U2; the output terminal of the second comparator U2 is connected to the non-return 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 as the load current increases. When the load current is greater than the preset threshold, the voltage of the first input end of the second comparator U2 is greater than the voltage of the second input end, and the output end of the second comparator U2 outputs a high level to drive the enable of the non-return circuit controller 202 to be turned on; when the load current is smaller than the preset threshold, the voltage of the first input terminal of the second comparator U2 is smaller than the voltage of the second input terminal, and the output terminal of the second comparator U2 outputs a low level to drive the enable of the non-return circuit controller 202 to be turned off.

In a possible implementation manner, the output end of the second comparator U2 may be connected to an enable port or a power control end of the check circuit controller 202, and when the output end of the second comparator U2 outputs a high level, the check circuit controller 202 is powered to enter an operating state; when the output end of the second comparator U2 outputs a low level, the check circuit controller 202 does not need to be powered 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 for being connected to a 3.3V preset power supply, the second end of the first resistor R1 and the second end of the second resistor R2 are connected with the second input end of the second comparator U2 together, and the second end of the second resistor R2 is grounded. The preset power supply only needs to be a 3.3V power supply, and may be obtained by dividing voltage by the power supply unit 100, or may be a 3.3V power supply separately set in the electronic device. The resistance values of the first resistor R1 and the second resistor R2 are related to a preset threshold value of the set load current.

When the controller enabling driving module 203 detects that the current of the load 300 is smaller than the preset threshold, it is indicated that the load in the electronic device is in a low power consumption standby state, the controller enabling driving module 203 drives the enabling of the check circuit controller 202 to be closed, the check circuit controller 202 is in a closed state, the check circuit 201 is in a cut-off state, the power supply unit supplies power to the system through a body diode of a field effect transistor MOSFET, the body diode can be regarded as a common diode, the whole current of the power supply circuit is small at this time, so that the voltage drop generated by the body diode is small, and the power consumption is small as that the common diode is connected behind the power supply unit.

When the controller enabling driving module 203 detects that the current of the load 300 is greater than the preset threshold, that is, the load in the electronic device is in a large current working state (such as the intelligent door lock motor rotates, a speaker plays sound, or a camera starts to collect images), the controller enabling driving module 203 drives the enabling of the check circuit controller 202 to open, so that the check circuit controller 202 controls the field effect transistor Q1 to be in an on or off state: when the enable of the non-return circuit controller 202 is in an open state, if the drain input voltage of the field effect transistor Q1 is greater than the source output voltage, the non-return circuit controller 202 drives the field effect transistor Q1 to be conducted, and at the moment, the field effect transistor Q1 is similar to an ideal diode, so that the generated voltage drop is small, and the power consumption of the circuit is reduced; if the input voltage of the drain of the field effect transistor Q1 is less than the output voltage of the source, the non-return circuit controller 202 drives the field effect transistor Q1 to be cut off, so as to prevent the current from flowing backwards.

The power supply circuit can enable the controller enable driving module to automatically drive the enable of the non-return circuit controller according to the change of the current of the load end, and can also enable the non-return circuit to switch between the common diode and the ideal diode according to the voltage of the input end and the voltage of the output end of the non-return circuit, thereby reducing the power consumption of the circuit and prolonging the endurance time of the power supply.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A power supply circuit, comprising: the device comprises a non-return circuit, a non-return circuit controller and a controller enabling driving module;

the controller enabling driving module is connected to the non-return circuit controller and used for detecting the electrical parameter of the load and driving enabling of the non-return circuit controller to be opened or closed based on the electrical parameter;

the non-return circuit controller is connected with the non-return circuit and is used for detecting the voltage of the input end and the voltage of the output end of the non-return circuit and controlling the non-return circuit to be switched on or switched off based on the voltage of the input end and the voltage of the output end of the non-return circuit;

the non-return circuit is connected between the power supply unit and the load and can prevent reverse current when the non-return circuit is in a cut-off state.

2. The power supply circuit according to claim 1, wherein the electrical parameter is a current, the controller enable driving module is configured to detect a current of a load, the controller enable driving module turns off the enabling of the non-return circuit controller when the current of the load is smaller than a preset threshold, and the controller enable driving module turns on the enabling of the non-return circuit controller when the current of the load is larger than the preset threshold.

3. The power supply circuit of claim 1, wherein the non-return circuit is a field effect transistor.

4. The power supply circuit according to any one of claims 1 to 3, wherein the non-return circuit controller is a comparator or an analog-digital converter;

the non-return circuit controller is used for controlling the non-return circuit to be in a cut-off state when the output end voltage of the non-return circuit is larger than the input end voltage, and controlling the non-return circuit to be in a conducting state when the output end voltage of the non-return circuit is smaller than the input end voltage.

5. The power supply circuit of claim 4, wherein the non-return circuit controller is a first comparator, a first input terminal of the first comparator is connected to an input terminal of the non-return circuit, a second input terminal of the first comparator is connected to an output terminal of the non-return circuit, and an output terminal of the first comparator is connected to a control terminal of the non-return 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 enable driving module comprises a second comparator and a reference circuit;

the sampling resistor is used for being connected to the load;

the first input end of the second comparator is connected between the load and the sampling resistor;

the second input end of the second comparator is connected to the reference circuit, and the reference circuit is used for inputting a reference voltage to the second input end of the second comparator;

and the output end of the second comparator is connected with the non-return circuit controller.

7. The power supply circuit of claim 6, wherein the reference circuit comprises a first resistor and a second resistor;

the first end of the first resistor is used for being connected to a preset power supply, the second end of the first resistor and the second end of the second resistor are connected with the second input end of the second comparator together, and the second end of the second resistor is grounded.

8. The power supply circuit according to claim 1, wherein the power supply circuit includes a plurality of the check circuits for connection to the plurality of power supply units, respectively, and a plurality of the check circuit controllers; the plurality of non-return circuit controllers are respectively used for controlling the conduction or the cut-off of the plurality of non-return circuits; the controller enables the driving module to be simultaneously connected with the plurality of the check circuit controllers so as to drive the plurality of the check circuit controllers to enable the check circuit controllers to be simultaneously opened or closed.

9. An electronic device, comprising: a power supply unit, a load and a supply circuit as claimed in any one of claims 1 to 8, the non-return circuit in the supply circuit being adapted to be connected between the power supply unit and the load.

10. The electronic device of claim 9, wherein the electronic device is a smart door lock, and the load comprises any one or more of a drive motor, a touch pad, a speaker, a controller, and a camera.

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