Switching circuit, power management module and electronic equipment

Abstract

The utility model provides a switch circuit which comprises a first switch element (Q1), the switch circuit further comprises a charging end and a pull-down unit (110), a first pole of the first switch element (Q1) is electrically connected with a battery end, a second pole of the first switch element (Q1) is electrically connected with a load power supply end (VCC), and a third pole of the first switch element (Q1) is electrically connected with a second pole of the pull-down unit (110). A control electrode of the first switch element (Q1) is electrically connected with a first end of the pull-down unit (110), and the first switch element (Q1) is turned on under the condition that the control electrode of the first switch element receives a low level; the control end of the pull-down unit (110) is electrically connected with the charging end, the second end of the pull-down unit (110) is used for being electrically connected with a grounding end, and under the condition that the control end of the pull-down unit (110) receives a charging signal, the second end of the pull-down unit (110) is conducted with the first end of the pull-down unit (110). The utility model also provides a power management module and an electronic device.

Description

Technical Field

[0001] The utility model relates to the field of power management, in particular to a switch circuit, a power management module comprising the switch circuit, and an electronic device comprising the power management module. Background Art

[0002] Portable electronic devices are popular among consumers because of their portability. To achieve portability, rechargeable batteries are usually configured in the portable electronic devices.

[0003] After the battery in the portable electronic device is exhausted, the battery needs to be charged and the portable electronic device needs to be turned on, which is relatively troublesome. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a switch circuit, a power management module including the switch circuit, and an electronic device including the power management module. The switch circuit can realize automatic power-on when charging the battery of the electronic device.

[0005] In order to achieve the above-mentioned object, the utility model discloses a switching circuit in a first aspect. The switching circuit includes a first switching element, wherein the switching circuit also includes a charging terminal and a pull-down unit.

[0006] The first electrode of the first switch element is electrically connected to the battery terminal, the second electrode of the first switch element is electrically connected to the load power supply terminal, the control electrode of the first switch element is electrically connected to the first end of the pull-down unit, and when the control electrode of the first switch element receives a low level, the first switch element is turned on;

[0007] The control end of the pull-down unit is electrically connected to the charging end, and the second end of the pull-down unit is used to be electrically connected to the ground end. When the control end of the pull-down unit receives a charging signal, the second end of the pull-down unit is conductively connected to the first end of the pull-down unit.

[0008] Optionally, the switch circuit further includes a trigger switch, a pull-down control unit, a first unidirectional unit and a second unidirectional unit.

[0009] The first end of the pull-down unit is also electrically connected to the first end of the pull-down control unit, the control end of the pull-down control unit is used to be electrically connected to the enable signal output end of the control unit, and the second end of the pull-down control unit is used to be electrically connected to the ground end. When the pull-down control unit receives an enable signal, the first end of the pull-down control unit is connected to the second end of the pull-down control unit. When the control end of the pull-down control unit receives a non-enable signal, the first end of the pull-down control unit is disconnected from the second end of the pull-down control unit.

[0010] The first end of the first unidirectional unit is electrically connected to the control electrode of the first switch element, the second end of the first unidirectional unit is electrically connected to the first end of the trigger switch, the second end of the trigger switch is used to be electrically connected to the ground end, and the first unidirectional unit is used to be turned on when the potential of the first end of the first unidirectional unit is higher than the potential of the second end of the first unidirectional unit;

[0011] The first end of the second unidirectional unit is electrically connected to the second end of the first unidirectional unit, and the second end of the second unidirectional unit is electrically connected to the load power supply end and the power supply end of the control unit. The second unidirectional unit is used to conduct when the potential of the second end of the second unidirectional unit is higher than the potential of the first end of the second unidirectional unit.

[0012] Optionally, the pull-down control unit includes a third switching tube element, a gate of the third switching tube element is used to be electrically connected to an enable signal output terminal of the control unit, a first pole of the third switching tube element is electrically connected to a first end of the pull-down unit, a second pole of the third switching tube element is used to be electrically connected to a ground terminal, and when the gate of the third switching tube element receives the enable signal, the third switching tube element is turned on, and when the gate of the third switching tube element receives the non-enable signal, the third switching tube element is turned off.

[0013] Optionally, the pull-down control unit further includes a fourth voltage-stabilizing capacitor and a sixth resistor, and the fourth voltage-stabilizing capacitor and the sixth resistor are connected in parallel between the ground terminal and the gate of the third switch tube element.

[0014] Optionally, the pull-down unit includes a second switching tube element, a gate of the second switching tube element is electrically connected to the charging end, a first pole of the second switching tube element is electrically connected to the battery end, a second pole of the second switching tube element is used to be electrically connected to the ground end, and when the gate of the second switching tube element receives the charging signal, the second switching tube element is turned on.

[0015] Optionally, the pull-down unit further includes a third voltage-stabilizing capacitor and a fourth resistor, and the third voltage-stabilizing capacitor and the fourth resistor are connected in parallel between the ground terminal and the gate of the second switch tube element.

[0016] Optionally, the switching circuit further includes a first voltage-stabilizing capacitor, wherein the first voltage-stabilizing capacitor is electrically connected between a first electrode of the first switching element and a control electrode of the first switching element.

[0017] Optionally, the switch circuit further includes a second voltage-stabilizing capacitor, and the second voltage-stabilizing capacitor is electrically connected between the load power supply terminal and the ground terminal.

[0018] As a second aspect of the utility model, a power management module is provided, which includes a switching circuit and a rechargeable battery, wherein the switching circuit is the switching circuit provided by the first aspect of the utility model, and the battery is charged through the charging end and outputs a voltage signal to the battery end.

[0019] As a third aspect of the present invention, an electronic device is provided, comprising a load and a power management module for supplying power to the load, wherein the power management module is the power management module provided in the second aspect of the present invention.

[0020] In the implementation of the utility model, when the charging terminal receives the charging signal, the battery is charged through the battery terminal. In addition, the battery can also supply power to the switch circuit through the battery terminal.

[0021] When charging the battery through the charging terminal, the control terminal of the pull-down unit receives a charging signal, so the second terminal of the pull-down unit is connected to the first terminal of the pull-down unit, so that the control electrode of the first switch element can be connected to the second terminal of the pull-down unit, so that the control electrode of the first switch element is grounded, and finally the control electrode potential of the first switch element is pulled down. In this case, the first switch element can be turned on (that is, the first electrode of the first switch element and the second electrode of the first switch element are turned on), and power is supplied to the load power supply terminal through the battery terminal, and then to the load, so as to realize automatic startup of the electronic device.

[0022] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings:

[0024] Figure 1 A module diagram of an implementation of a switch circuit provided by the utility model;

[0025] Figure 2 A circuit diagram of an implementation of a switch circuit provided by the utility model;

[0026] Figure 3 A module diagram of an implementation scheme of an electronic device provided by the utility model.

[0027] Description of Reference Numerals

[0028] 110: Pull-down unit 120: Pull-down control unit

[0029] 200: Battery 300: Load

[0030] SW1: trigger switch Q1: first switch element

[0031] Q2: The second switch tube element Q3: The third switch tube element

[0032] D1: first unidirectional unit D2: second unidirectional unit

[0033] C1: first voltage stabilizing capacitor C2: second voltage stabilizing capacitor

[0034] C3: The third voltage stabilizing capacitor C4: The fourth voltage stabilizing capacitor

[0035] R1: first resistor R2: second resistor

[0036] R3: The third resistor R4: The fourth resistor

[0037] R5: fifth resistor R6: sixth resistor

[0038] 400: Charging control module DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments based on the embodiments are intended to be used to explain the present invention and cannot be understood as limiting the present invention.

[0040] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0041] like Figure 1 and Figure 2 As shown, as the first aspect of the utility model, a switching circuit is provided, the switching circuit includes a trigger switch SW1 and a first switching element Q1, wherein the switching circuit also includes a charging end, a first unidirectional unit D1, a second unidirectional unit D2, a pull-down unit 110 and a pull-down control unit 120.

[0042] The first electrode of the first switch element Q1 is electrically connected to the battery terminal VBAT, the second electrode of the first switch element Q1 is electrically connected to the load power supply terminal VCC, and the control electrode of the first switch element Q1 is electrically connected to the first end of the pull-down unit 110. When the control electrode of the first switch element Q1 receives a low level, the first switch element Q1 is turned on (that is, the first electrode of the first switch element Q1 and the second electrode of the first switch element Q1 are turned on).

[0043] The control end of the pull-down unit 110 is electrically connected to the charging end, the second end of the pull-down unit 110 is used to be electrically connected to the ground end, the first end of the pull-down unit 110 is electrically connected to the first end of the pull-down control unit 120, and when the control end of the pull-down unit 110 receives a charging signal, the first end of the pull-down unit 110 is conductively connected to the second end of the pull-down unit 110.

[0044] like Figure 3 As shown, the switch circuit is used in an electronic device, and cooperates with a battery 200 and a control unit MCU to supply power to a load 300. The battery 200 is a rechargeable battery.

[0045] In the implementation of the present invention, when the charging terminal receives the charging signal, the battery 200 is charged through the battery terminal VBAT. In addition, the battery 200 can also supply power to the switch circuit through the battery terminal VBAT.

[0046] When charging the battery through the charging terminal, the control terminal of the pull-down unit 110 receives a charging signal, so the second terminal of the pull-down unit 110 is connected to the first terminal of the pull-down unit 110, so that the control electrode of the first switch element Q1 can be connected to the second terminal of the pull-down unit 110, so that the control electrode of the first switch element Q1 is grounded, and finally the control electrode potential of the first switch element Q1 is pulled down. In this case, the first switch element Q1 can be turned on (that is, the first electrode of the first switch element Q1 and the second electrode of the first switch element Q1 are turned on), and power is supplied to the load power supply terminal VCC through the battery terminal VBAT, and then power is supplied to the load 300, so as to realize automatic startup of the electronic device.

[0047] That is to say, when charging an electronic device including the switch circuit provided by the embodiment of the utility model, it can be automatically turned on without the need to cooperate with the power-on operation of other buttons, thereby improving the user experience of the electronic device.

[0048] In the embodiment of the utility model, there is no special limitation on how to charge. As an optional implementation, the charging end can be a USB interface.

[0049] In addition to powering on the electronic device by providing a charging signal to the charging terminal, the electronic device can also be powered on by a switch. Figure 1 As shown, the switch circuit may further include a trigger switch SW1, a pull-down control unit 120, a first unidirectional unit D1 and a second unidirectional unit D2.

[0050] The first end of the pull-down unit 110 is also electrically connected to the first end of the pull-down control unit 120. The control end of the pull-down control unit 120 is used to be electrically connected to the enable signal output end of the control unit MCU. The second end of the pull-down control unit 120 is used to be grounded (i.e., electrically connected to the ground end). When the pull-down control unit 120 receives the enable signal, the first end of the pull-down control unit 120 is conductively connected to the second end of the pull-down control unit 120.

[0051] The second end of the first unidirectional unit D1 is electrically connected to the first end of the trigger switch SW1, and the second end of the trigger switch SW1 is used to be electrically connected to the ground end. The first unidirectional unit D1 is used to be turned on when the potential of the first end of the first unidirectional unit D1 is higher than the potential of the second end of the first unidirectional unit D1.

[0052] The first end of the second unidirectional unit D2 is electrically connected to the second end of the first unidirectional unit D1, and the second end of the second unidirectional unit D2 is electrically connected to the load power supply end VCC and the power supply end of the control unit MCU. The second unidirectional unit D2 is used to be turned on when the potential of the second end of the second unidirectional unit D2 is higher than the potential of the first end of the second unidirectional unit D2.

[0053] The trigger switch SW1 is an external button. When the operator presses the trigger switch SW1, the potential of the first end of the first unidirectional unit D1 is higher than the potential of the second end of the first unidirectional unit D1, the potential of the control electrode of the first switch element Q1 is pulled down, and the first electrode of the first switch element Q1 and the second electrode of the first switch element Q1 are turned on. The battery supplies power to the load power supply terminal VCC through the battery terminal VBAT. At the same time, the load power supply terminal VCC supplies power to the control unit MCU, so that the control unit MCU outputs an enable signal through the enable signal output terminal. After receiving the enable signal, the first and second ends of the pull-down control unit 120 are turned on, and the control electrode of the first switch element Q1 is pulled down. Even if the pressure trigger switch SW1 is disconnected, the first switch element Q1 can be maintained in the on state.

[0054] A second unidirectional unit D2 is further connected in series between the load power supply terminal VCC and the trigger switch SW1 , so as to prevent the potential of the load power supply terminal VCC from affecting the potential of the second end of the first unidirectional unit D1 .

[0055] The control unit MCU can also output a non-enable signal through the enable signal output terminal, so that the first and second terminals of the pull-down control unit 120 can be disconnected. Accordingly, the control electrode level of the first switch element Q1 is high, so that the first switch element Q1 is also disconnected, and finally the battery terminal VBAT is disconnected from the load power supply terminal, and the load and control unit MCU are also powered off. In this case, the load of the entire electronic device is powered off, and only the static power consumption of the battery exists, so as to achieve the purpose of shutdown and realize long battery life.

[0056] In the embodiment of the utility model, the specific structure of the first unidirectional unit D1 and the second unidirectional unit D2 is not particularly limited, as long as they can achieve the corresponding "one-way conduction" function. Figure 2 In the embodiment shown in , the first unidirectional unit D1 and the second unidirectional unit D2 are both diodes.

[0057] In the embodiment of the present invention, there is no special limitation on the specific circuit structure of the pull-down control unit 120 , as long as it can act under the control of the enable signal received by the control terminal of the pull-down control unit 120 .

[0058] like Figure 2As shown, the pull-down control unit 120 may include a third switch tube element Q3, the gate of the third switch tube element Q3 is used to be electrically connected to the enable signal output terminal of the control unit MCU, the first pole of the third switch tube element Q3 is electrically connected to the first end of the pull-down unit 110, and the second pole of the third switch tube element Q3 is used to be electrically connected to the ground terminal. When the gate of the third switch tube element Q3 receives the enable signal, the third switch tube element Q3 is turned on (that is, the first pole of the third switch tube element Q3 is connected to the second pole of the third switch tube element Q3). When the gate of the third switch tube element Q3 receives the non-enable signal, the third switch tube element Q3 is turned off (that is, the first pole of the third switch tube element Q3 is disconnected from the second pole of the third switch tube element Q3). It should be pointed out that the first pole of the third switch tube element Q3 is used as the first end of the pull-down control unit 120, the second pole of the third switch tube element Q3 is used as the second end of the pull-down control unit 120, and the gate of the third switch tube element Q3 is used as the control end of the pull-down control unit 120.

[0059] In order to stabilize the gate voltage of the third switch tube element Q3, optionally, the pull-down control unit 120 further includes a fourth stabilizing capacitor C4 and a sixth resistor R6, which are connected in parallel between the ground terminal and the gate of the third switch tube element Q3.

[0060] As an optional implementation, a fifth resistor R5 may be connected in series between the gate of the third switch element Q3 and the enable signal input terminal.

[0061] As an optional implementation, the enable signal may be a high level signal, and the disable signal may be a low level signal. The third switch element Q3 is an NPN transistor, the first electrode of the third switch element Q3 may be a collector, and the second electrode of the third switch element Q3 may be an emitter.

[0062] In the embodiment of the present invention, there is no particular limitation on the specific structure of the pull-down unit 110 , as long as it can be operated under the control of the charging signal.

[0063] As an optional embodiment, the pull-down unit 110 includes a second switch tube element Q2, the gate of the second switch tube element Q2 is electrically connected to the charging terminal, the first electrode of the second switch tube element Q2 is electrically connected to the battery terminal VBAT, the second electrode of the second switch tube element Q2 is used to be electrically connected to the ground terminal, and when the gate of the second switch tube element Q2 receives the charging signal, the second switch tube element Q2 is turned on (that is, the first electrode of the second switch tube is connected to the second electrode of the second switch tube element Q2). It should be pointed out that the first electrode of the second switch tube element Q2 is used as the first end of the pull-down unit 110, the second electrode of the second switch tube element Q2 is used as the second end of the pull-down unit 110, and the gate of the second switch tube element Q2 is used as the control end of the pull-down unit 110.

[0064] In order to maintain the stability of the gate voltage of the second switch tube element Q2, optionally, the pull-down unit 110 further includes a third stabilizing capacitor C3 and a fourth resistor R4, which are connected in parallel between the ground terminal and the gate of the second switch tube element Q2.

[0065] As an optional implementation, a second resistor R2 may be connected in series between the charging terminal and the gate of the second light-opening tube element Q2.

[0066] As an optional implementation, the charging signal is a high level signal, the second switch tube element Q2 is an NPN transistor, the first electrode of the second switch tube element Q2 can be a collector, and the second electrode of the second switch tube element Q2 can be an emitter.

[0067] In order to slowly turn on the first switch element Q1 and protect the load, optionally, the switch circuit further includes a first stabilizing capacitor C1 electrically connected between the first electrode of the first switch element Q1 and the control electrode of the first switch element Q1.

[0068] In order to stabilize the voltage of the load power supply terminal VCC, optionally, the switch circuit further includes a second voltage stabilizing capacitor C2, and the second voltage stabilizing capacitor C2 is electrically connected between the load power supply terminal VCC and the ground terminal.

[0069] In the present invention, the specific type of the first switch element Q1 is not limited as described above. For example, the first switch element Q1 can be a P-type MOS tube.

[0070] As a second aspect of the present invention, a power management module is provided, the power management module comprising a switch circuit and a rechargeable battery, wherein the switch circuit is the switch circuit provided in the embodiment of the present invention.

[0071] As described above, when charging an electronic device including the switch circuit provided by the embodiment of the utility model, it can be automatically turned on without cooperating with other power-on operations, thereby improving the user experience of the electronic device.

[0072] It should be pointed out that if Figure 3 As shown, the power management module also includes a charging control module 400 for controlling the charging of the battery.

[0073] As an optional implementation, the switching circuit includes a pull-down control unit 120, and accordingly, the power management module may also include a control unit MCU, which is used to output an enable signal through the enable signal output end of the control unit MCU after the power supply end of the control unit MCU is powered on.

[0074] As a third aspect of the present invention, an electronic device is provided, comprising a load and a power management module for supplying power to the load, wherein the power management module is the power management module provided in the second aspect of the present invention.

[0075] As an optional implementation, the load includes a code scanning module. Accordingly, when the code scanning module scans the shutdown control code, the control unit MCU can output a non-enable signal through the enable signal output terminal, so that the third switch tube unit Q3 can be turned off. Correspondingly, the control electrode level of the first switch element Q1 is high, so that the first switch element Q1 is also disconnected, and finally the battery terminal VBAT is disconnected from the load power supply terminal, and the load is powered off, and the control unit MCU is also powered off. In this case, the load of the entire electronic device is powered off, and only the static power consumption of the battery exists, so as to achieve the purpose of shutdown and realize long battery life.

[0076] Below Figure 2 and Figure 3 Taking the specific implementation shown in as an example, the working principle of the power management module is briefly described.

[0077] like Figure 2 As shown, the switch circuit includes a pull-down unit 110, a pull-down control unit 120, a first unidirectional unit D1 and a second unidirectional unit D2.

[0078] The pull-down unit 110 includes a second switch element Q2, a second resistor R2, a third stabilizing capacitor C3 and a fourth resistor R4.

[0079] The pull-down control unit 120 includes a third switch element Q3, a fourth voltage stabilizing capacitor C4, a fifth resistor R5 and a sixth resistor R6.

[0080] A first resistor R1 and a first stabilizing capacitor C1 are connected in parallel between the first electrode of the first switching element Q1 and the control electrode of the first switching element Q1 .

[0081] A second voltage stabilizing capacitor C2 is connected in series between the load power supply terminal VCC and the ground terminal, and a third resistor R3 is connected in series between the load power supply terminal VCC and the power supply terminal of the control unit MCU.

[0082] When the trigger switch SW1 is pressed (corresponding to Figure 3 The key signal in the input signal is used to control the first switch element Q1, and the control value of the first switch element Q1 is pulled low. The first switch element Q1 is turned on, and the load power supply terminal VCC is powered on, and the control unit MCU is also powered on.

[0083] In addition, the low signal of the trigger switch SW1 is also given to the control unit MCU. When the key trigger signal given to the control unit MCU lasts for a certain period of time (for example, 10s), the control unit MCU outputs a high level to control the third switch tube element Q3 to turn on, thereby also causing the control electrode of the first switch element Q1 to be pulled low. This state is maintained. At this moment, if the key is released, there is no effect, and the function of turning on the electronic device is realized.

[0084] In addition, when the USB at the charging end is plugged in, the second switch tube element Q2 can be turned on, so that the control electrode of the first switch element Q1 device is pulled low, the first switch element Q1 is turned on, the load power supply end VCC is powered on, and the control unit MCU is also powered on. In this way, the control unit MCU can charge the battery 200 by controlling the charging control module 400 in the electronic device, thereby realizing the function of plugging in the USB and starting the electronic device for charging.

[0085] The electronic device can be a code scanning device. When the electronic device needs to read the shutdown code to shut down, the control unit MCU actively changes the output high-level enable signal to a low-level non-enable signal, so that the third switch tube element Q3 is turned off. At this moment, the control electrode of the first switch element Q1 is pulled high, the first switch element Q1 is turned off and is not conducting, the load power supply terminal VCC is powered off, and the control unit MCU is also powered off, and the load of the entire device is powered off. In this case, there is only static power consumption of the battery, the purpose of shutdown is achieved, and the battery life is long.

[0086] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A switching circuit, comprising a first switching element (Q1), characterized in that: The switch circuit further comprises a charging terminal and a pull-down unit (110). The first electrode of the first switch element (Q1) is electrically connected to the battery terminal (VBAT), the second electrode of the first switch element (Q1) is electrically connected to the load power supply terminal (VCC), the control electrode of the first switch element (Q1) is electrically connected to the first end of the pull-down unit (110), and when the control electrode of the first switch element (Q1) receives a low level, the first switch element (Q1) is turned on; The control end of the pull-down unit (110) is electrically connected to the charging end, the second end of the pull-down unit (110) is used to be electrically connected to the ground end, and when the control end of the pull-down unit (110) receives a charging signal, the second end of the pull-down unit (110) is conductively connected to the first end of the pull-down unit (110).

2. The switch circuit according to claim 1, characterized in that: The switch circuit further comprises a trigger switch (SW1), a pull-down control unit (120), a first unidirectional unit (D1) and a second unidirectional unit (D2), The first end of the pull-down unit (110) is also electrically connected to the first end of the pull-down control unit (120); the control end of the pull-down control unit (120) is used to be electrically connected to the enable signal output end of the control unit (MCU); the second end of the pull-down control unit (120) is used to be electrically connected to the ground end; when the pull-down control unit (120) receives an enable signal, the first end of the pull-down control unit (120) is connected to the second end of the pull-down control unit (120); when the control end of the pull-down control unit receives a non-enable signal, the first end of the pull-down control unit (120) is disconnected from the second end of the pull-down control unit (120); The first end of the first unidirectional unit (D1) is electrically connected to the control electrode of the first switch element (Q1), the second end of the first unidirectional unit (D1) is electrically connected to the first end of the trigger switch (SW1), the second end of the trigger switch (SW1) is used to be electrically connected to the ground end, and the first unidirectional unit (D1) is used to be turned on when the potential of the first end of the first unidirectional unit (D1) is higher than the potential of the second end of the first unidirectional unit (D1); The first end of the second unidirectional unit (D2) is electrically connected to the second end of the first unidirectional unit (D1), the second end of the second unidirectional unit (D2) is electrically connected to the load power supply end (VCC) and the power supply end of the control unit (MCU), and the second unidirectional unit (D2) is used to be turned on when the potential of the second end of the second unidirectional unit (D2) is higher than the potential of the first end of the second unidirectional unit (D2).

3. The switch circuit according to claim 2, characterized in that: The pull-down control unit (120) comprises a third switch tube element (Q3), the gate of the third switch tube element (Q3) is used to be electrically connected to the enable signal output terminal of the control unit (MCU), the first electrode of the third switch tube element (Q3) is electrically connected to the first end of the pull-down unit (110), and the second electrode of the third switch tube element (Q3) is used to be electrically connected to the ground terminal. When the gate of the third switch tube element (Q3) receives the enable signal, the third switch tube element (Q3) is turned on, and when the gate of the third switch tube element (Q3) receives the non-enable signal, the third switch tube element (Q3) is turned off.

4. The switch circuit according to claim 3, characterized in that: The pull-down control unit (120) further comprises a fourth voltage-stabilizing capacitor (C4) and a sixth resistor (R6), wherein the fourth voltage-stabilizing capacitor (C4) and the sixth resistor (R6) are connected in parallel between the ground terminal and the gate of the third switch tube element (Q3).

5. The switch circuit according to claim 1, characterized in that: The pull-down unit (110) comprises a second switch tube element (Q2), a gate of the second switch tube element (Q2) being electrically connected to the charging end, a first electrode of the second switch tube element (Q2) being electrically connected to the battery end (VBAT), a second electrode of the second switch tube element (Q2) being electrically connected to the ground end, and when the gate of the second switch tube element (Q2) receives the charging signal, the second switch tube element (Q2) is turned on.

6. The switch circuit according to claim 5, characterized in that: The pull-down unit (110) further comprises a third voltage-stabilizing capacitor (C3) and a fourth resistor (R4), wherein the third voltage-stabilizing capacitor (C3) and the fourth resistor (R4) are connected in parallel between the ground terminal and the gate of the second switch tube element (Q2).

7. The switch circuit according to any one of claims 1 to 6, characterized in that: The switch circuit further comprises a first voltage-stabilizing capacitor (C1), wherein the first voltage-stabilizing capacitor (C1) is electrically connected between a first electrode of the first switch element (Q1) and a control electrode of the first switch element (Q1).

8. The switch circuit according to any one of claims 1 to 6, characterized in that: The switch circuit further comprises a second voltage-stabilizing capacitor (C2), wherein the second voltage-stabilizing capacitor (C2) is electrically connected between the load power supply terminal (VCC) and the ground terminal.

9. A power management module, comprising a switch circuit and a rechargeable battery (200), characterized in that: The switching circuit is the switching circuit according to any one of claims 1 to 8, the battery is charged through the charging terminal, and outputs a voltage signal to the battery terminal.

10. An electronic device, comprising a load and a power management module for supplying power to the load, characterized in that: The power management module is the power management module according to claim 9.

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