Protection circuit for a chargeable device and chargeable device

Abstract

The application provides a protection circuit of a chargeable device, the chargeable device further comprises a battery and an acceleration sensor, the acceleration sensor receives a supply voltage, and is configured to output a start-up signal when the supply voltage is greater than a preset first voltage threshold and an acceleration of the chargeable device is greater than a preset acceleration threshold, the start-up signal being configured to control the chargeable device to start up. The protection circuit comprises: a voltage dividing circuit configured to divide a first end voltage of the battery according to a trigger signal to obtain a first voltage; and a protection module configured to adjust the supply voltage when the first voltage is less than a preset second voltage threshold, so that the supply voltage is less than the first voltage threshold. Thus, the protection circuit of the chargeable device and the chargeable device provided by the application can improve the standby time, the endurance and the customer satisfaction of the chargeable device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a protection circuit for a rechargeable device and a rechargeable device. Background Technology

[0002] Rechargeable devices equipped with accelerometers typically activate by vibration. When the accelerometer detects that the device's acceleration exceeds a preset power-on acceleration, it outputs a power-on signal to a microcontroller. The microcontroller then powers on the device based on this signal. However, if the device experiences unintended vibration, such as during transport, it may also power on, resulting in unnecessary power consumption. Utility Model Content

[0003] In view of the above problems, this application provides a protection circuit for a rechargeable device and a rechargeable device.

[0004] In a first aspect, this application provides a protection circuit for a rechargeable device. The rechargeable device further includes a battery and an accelerometer. The accelerometer receives a supply voltage and outputs a power-on signal when the supply voltage exceeds a preset first voltage threshold and the acceleration of the rechargeable device exceeds the preset acceleration threshold. The power-on signal is used to control the rechargeable device to power on. The protection circuit comprises: a voltage divider circuit electrically connected to the first terminal of the battery, used to receive a trigger signal and divide the voltage at the first terminal of the battery according to the trigger signal to obtain a first voltage; and a protection module electrically connected to the voltage divider circuit, used to receive the first voltage and adjust the supply voltage so that the supply voltage is less than the first voltage threshold when the first voltage is less than a preset second voltage threshold.

[0005] In conjunction with the first aspect, in one possible implementation, the protection module includes a control circuit, a power supply pin, and a voltage detection pin. The power supply pin is electrically connected to the output of a voltage divider circuit, and the control circuit is electrically connected to both the power supply pin and the voltage detection pin. The control circuit is used to: adjust the voltage of the voltage detection pin to the second voltage when the first voltage is less than a preset second voltage threshold, thereby adjusting the power supply voltage. The power supply voltage, the difference between the first voltage and the voltage of the voltage detection pin are proportional, and the difference between the first voltage and the second voltage is less than the first voltage threshold.

[0006] In conjunction with the first aspect, in one possible implementation, the rechargeable device further includes a voltage regulator, the input of which is electrically connected to the first terminal of the battery and a voltage detection pin, and the output of which is electrically connected to an accelerometer. The voltage regulator is used to output a supply voltage based on the difference between the voltage at the first terminal of the battery and the voltage at the voltage detection pin.

[0007] In conjunction with the first aspect, in one possible implementation, the voltage divider circuit includes a switching transistor, a first voltage divider resistor, and a second voltage divider resistor. The first end of the first voltage divider resistor is electrically connected to the first end of the battery. The second end of the first voltage divider resistor is electrically connected to one end of the second voltage divider resistor and the power supply pin of the protection module. The other end of the second voltage divider resistor is electrically connected to the first end of the switching transistor. The second end of the switching transistor is grounded. The control terminal of the switching transistor is used to receive a trigger signal. The switching transistor turns on in response to the trigger signal.

[0008] In conjunction with the first aspect, in one possible implementation, the protection module further includes a pull-up switch and a pull-down switch. The first terminal of the pull-up switch receives the first terminal voltage of the battery, and the second terminal of the pull-up switch is electrically connected to the voltage detection pin. The first terminal of the pull-down switch is grounded, and the second terminal of the pull-down switch is electrically connected to the voltage detection pin. The control terminals of both the pull-up switch and the pull-down switch are electrically connected to the control circuit.

[0009] In conjunction with the first aspect, in one possible implementation, the control circuit is used to: control the pull-up switch to turn on and the pull-down switch to turn off when the first voltage is less than a preset second voltage threshold, so as to adjust the voltage of the voltage detection pin to the second voltage.

[0010] In conjunction with the first aspect, in one possible implementation, the protection module further includes a battery connection pin, an output connection pin, and a charge / discharge switch. The battery connection pin is electrically connected to the second end of the battery and ground, the output connection pin is electrically connected to the voltage detection pin, and the charge / discharge switch is electrically connected between the battery connection pin and the output connection pin. The control circuit is used to: control the charge / discharge switch to open when the first voltage is less than a preset second voltage threshold.

[0011] In conjunction with the first aspect, in one possible implementation, the rechargeable device further includes a microcontroller. The power supply terminal of the microcontroller is electrically connected to the output terminal of a voltage regulator, the sensing signal terminal of the microcontroller is electrically connected to an accelerometer, and the trigger signal terminal of the microcontroller is electrically connected to a voltage divider circuit. The microcontroller is used to control the rechargeable device to power on according to a power-on signal and to output a trigger signal according to a preset over-discharge protection command.

[0012] In conjunction with the first aspect, in one possible implementation, the voltage divider circuit further includes a delay circuit, which includes a delay capacitor and a delay resistor. The first ends of both the delay capacitor and the delay resistor are electrically connected to the control terminal of the switching transistor, the second end of the delay capacitor is grounded, and the second end of the delay resistor receives a trigger signal.

[0013] Secondly, this application provides a rechargeable device, including a battery, an accelerometer, a voltage regulator, a microcontroller, and a protection circuit as provided in any possible implementation of the first aspect. The voltage regulator receives a first terminal voltage from the battery and outputs a supply voltage based on the first terminal voltage of the battery and the voltage at the voltage detection pin of the protection module. The accelerometer receives the supply voltage and outputs a power-on signal when the supply voltage exceeds a preset first voltage threshold and the acceleration of the rechargeable device exceeds the preset acceleration threshold. The microcontroller receives the supply voltage and controls the rechargeable device to power on based on the power-on signal, and outputs a trigger signal based on a preset over-discharge protection command. The protection circuit adjusts the supply voltage based on the trigger signal so that the supply voltage is less than the first voltage threshold.

[0014] Therefore, the protection circuit and rechargeable device provided in this application can divide the first terminal voltage of the battery according to the trigger signal, thereby causing the protection module to enter the over-discharge protection mode. In the over-discharge protection mode, the charge / discharge switch in the protection module is disconnected, and the voltage of the voltage detection pin of the protection module is configured to be the first terminal voltage of the battery. Thus, the voltage difference between the first terminal voltage of the battery received by the voltage regulator and the voltage of the voltage detection pin is zero, resulting in zero supply voltage output by the voltage regulator. The accelerometer and microcontroller cannot operate, thereby reducing the power loss caused by accidental vibration-induced power-on of the rechargeable device, saving power, improving standby time and battery life, and enhancing customer satisfaction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a rechargeable device provided in an embodiment of this application.

[0016] Figure 2 This is a schematic diagram of a protection circuit provided in an embodiment of this application.

[0017] Figure 3 A circuit diagram of a protection circuit provided in an embodiment of this application.

[0018] Figure 4 The circuit diagram of the protection module provided in this application. Detailed Implementation

[0019] The technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings.

[0020] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, A can be directly connected to C, and C can be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connects to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0021] In the description of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0022] In the description of this application, the words "first," "second," etc., are used only to distinguish different objects and do not limit the quantity or order of execution, nor do they imply that they must be different. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of a rechargeable device 10 provided in an embodiment of this application.

[0024] The rechargeable device 10 includes a battery 11, a voltage regulator 12, an acceleration sensor 13, a microcontroller 14, and a protection circuit 15.

[0025] Battery 11 is electrically connected to voltage regulator 12 and protection circuit 15. Battery 11 is a rechargeable battery. Voltage regulator 12 is also electrically connected to accelerometer 13, microcontroller 14, and protection circuit 15. Accelerometer 13 is electrically connected to microcontroller 14. Microcontroller 14 is also electrically connected to protection circuit 15.

[0026] Battery 11 is used to output voltage to regulator 12 and protection circuit 15 to power regulator 12 and protection circuit 15.

[0027] In some embodiments, the battery 11 may be soldered to the motherboard of the rechargeable device 10. The output voltage of the battery 11 may be 3.4V-4.2V.

[0028] The voltage regulator 12 receives the output voltage of the battery 11 and the output voltage of the protection circuit 15, converts and regulates the voltage difference between them to obtain the supply voltage, and then transmits it to the accelerometer 13 and the microcontroller 14 to power them. The supply voltage is less than the voltage difference between the output voltage of the battery 11 and the output voltage of the protection circuit 15.

[0029] Accelerometer 13 is used to receive the power supply voltage and to detect the acceleration of the rechargeable device 10. When the acceleration of the rechargeable device 10 is greater than the preset acceleration threshold, the accelerometer 13 outputs a power-on signal to the microcontroller 14.

[0030] The microcontroller 14 receives the power supply voltage and controls the rechargeable device 10 to power on according to the power-on signal. That is, the rechargeable device 10 is powered on by vibrating it. If the rechargeable device 10 is not vibrated and is in the off state, the rechargeable device 10 will not power on.

[0031] If the rechargeable device 10 is subjected to accidental vibration, such as during transportation, the rechargeable device 10 will turn on and consume electrical energy, thus wasting electrical energy.

[0032] In view of the above problems, the microcontroller 14 is also used to receive a preset over-discharge protection command and output a trigger signal to the protection circuit 15 according to the over-discharge protection command. The protection circuit 15 can adjust its output voltage according to the trigger signal, so that the supply voltage output by the voltage regulator 12 is less than a first voltage threshold. The first voltage threshold can be a voltage threshold that allows the accelerometer 13 and the microcontroller 14 to work normally. That is, when the supply voltage is less than the first voltage threshold, the accelerometer 13 and the microcontroller 14 cannot work normally, thereby saving the power consumption of the rechargeable device 10, improving the standby time and battery life of the rechargeable device 10, and enhancing customer satisfaction.

[0033] Specifically, please refer to Figure 2 , Figure 2 This is a schematic diagram of a protection circuit 15 provided in one embodiment of this application. The protection circuit 15 includes a voltage divider circuit and a protection module 152.

[0034] The voltage divider circuit is electrically connected to the first terminal of the battery 11, the microcontroller 14, and the protection module 152. The protection module 152 is electrically connected to the voltage divider circuit.

[0035] The voltage divider is used in response to the trigger signal output by the microcontroller 14 to divide the first terminal voltage of the battery 11 to obtain a first voltage, wherein the first voltage is less than the over-discharge protection voltage threshold of the protection module 152.

[0036] The protection module 152 is used to enter the over-discharge protection mode when it receives the first voltage. In the over-discharge protection mode, the protection module 152 adjusts its output voltage so that the supply voltage output by the voltage regulator 12 is less than the first voltage threshold.

[0037] Please see Figure 3 , Figure 3 A circuit diagram of a protection circuit 15 provided in an embodiment of this application.

[0038] The voltage divider circuit includes a delay circuit, a switching transistor M1, a first voltage divider resistor R4, a second voltage divider resistor R5, a first isolation capacitor C2, and a diode D. The delay circuit includes a delay resistor R1 and a delay capacitor C1. The protection module 152 includes a power supply pin VDD, a battery connection pin S1, a voltage detection pin VM, and an output connection pin S2.

[0039] Diode D and delay resistor R1 are connected in parallel. One end of diode D and delay resistor R1 receives the trigger signal. The other end of diode D and third resistor R3 is electrically connected to the control terminal of switching transistor M1 and one end of delay capacitor C1.

[0040] In some embodiments, the delay circuit may also include a diode D and a delay capacitor C1. That is, the diode D can replace the delay resistor R1 and work with the delay capacitor C1 to form a delay circuit.

[0041] The delay capacitor C1 and the other end of the third resistor R3 are electrically connected to the first terminal of the switching transistor M1 and ground. The second terminal of the switching transistor M1 is electrically connected through the first voltage divider resistor R4 to one end of the second voltage divider resistor R5, one end of the first isolation capacitor C2, and the power supply pin VDD of the protection module 152. The other end of the second voltage divider resistor R5 is electrically connected through the second resistor R2 to the first terminal of the battery 11 and one input terminal of the voltage regulator 12. The other end of the first isolation capacitor C2 is electrically connected to the second terminal of the battery 11. The first terminal of the battery 11 is the positive terminal. The second terminal of the battery 11 is the negative terminal.

[0042] The voltage detection pin VM of the protection module 152 is electrically connected to one output terminal of the battery 11 and one input terminal of the voltage regulator 12 through the output resistor R6. One output terminal of the battery 11 is electrically connected to the negative terminal of the battery 11 through the second isolation capacitor C3.

[0043] The battery connection pin S1 of the protection module 152 is electrically connected to the negative terminal of the battery 11. The output connection pin S2 of the protection module 152 is electrically connected to one end of the output resistor R6 and one end of the third isolation capacitor.

[0044] In some embodiments, the switching transistor M1 can be an NMOS transistor. The first terminal of the switching transistor M1 is the source of the NMOS transistor. The second terminal of the switching transistor M1 is the drain of the NMOS transistor. The control terminal of the switching transistor M1 is the gate of the NMOS transistor.

[0045] When the voltage divider circuit does not receive a trigger signal, the anode of diode D and one end of delay resistor R1 are at a low level, causing switch M1 to turn off. At this time, the positive terminal output voltage of battery 11 is output to the power supply pin VDD of protection module 152 through the second voltage divider resistor R5. The voltage received by the power supply pin VDD of protection module 152 is the first terminal voltage of battery 11. The first terminal voltage of battery 11 is greater than the over-discharge protection voltage threshold of protection module 152, so protection module 152 will not adjust the voltage value of voltage detection pin VM. The voltage value of voltage detection pin VM is preset to ground voltage. The voltage regulator 12 outputs a supply voltage to acceleration sensor 13 and microcontroller 14 based on the difference between the first terminal voltage of battery 11 and ground voltage. At this time, the supply voltage is greater than the first voltage threshold, so that acceleration sensor 13 and microcontroller 14 can work normally.

[0046] When the voltage divider circuit receives a trigger signal, the anode of diode D and one end of delay resistor R1 are at a high level, thus turning on switch M1. At this time, a loop is formed between the positive terminal of battery 11, the second voltage divider resistor R5, the first voltage divider resistor R4, switch M1, and ground. The second voltage divider resistor R5 and the first voltage divider resistor R4 together divide the output voltage of battery 11, obtaining the first voltage, which is then output to the power supply pin VDD of protection module 152. The voltage received by the power supply pin VDD of protection module 152 is the first voltage of battery 11. Since the first voltage is less than the over-discharge protection voltage threshold of protection module 152, protection module 152 enters over-discharge protection mode. In over-discharge protection mode, protection module 152 disconnects the electrical connection between battery connection pin S1 and output connection pin S2, thus disconnecting the electrical connection between the negative terminal of battery 11 and voltage detection pin VM. At the same time, protection module 152 adjusts the voltage of voltage detection pin VM to the second voltage V+. The difference between the first terminal voltage of battery 11 and the second voltage V+ is less than the first voltage threshold.

[0047] Since the supply voltage output by the voltage regulator 12 is less than the voltage difference between the output voltage of the battery 11 and the output voltage of the protection circuit 15, where the output voltage of the battery 11 is the first terminal voltage of the battery 11 and the output voltage of the protection circuit 15 is the voltage of the voltage detection pin VM, the supply voltage is less than the difference between the first terminal voltage of the battery 11 and the voltage of the voltage detection pin VM. Therefore, when the voltage of the voltage detection pin VM is the second voltage V+, the supply voltage is less than the difference between the first terminal voltage of the battery 11 and the second voltage V+. Furthermore, since the difference between the first terminal voltage of the battery 11 and the second voltage V+ is less than the first voltage threshold, the supply voltage is less than the first voltage threshold at this time, and the accelerometer 13 and the microcontroller 14 cannot work normally, thereby saving power consumption of the rechargeable device 10.

[0048] In some embodiments, since the voltage divider circuit includes a delay circuit, the delay resistor R1 and the delay capacitor C1 work together, or the diode D works together with the delay capacitor C1, the conduction time of the switching transistor M1 can be extended, thereby increasing the time for the voltage of the voltage detection pin VM of the protection module 152 to rise to the first terminal voltage of the battery 11, thereby ensuring that the voltage of the voltage detection pin VM of the protection module 152 rises to the first terminal voltage of the battery 11.

[0049] Please see Figure 4 , Figure 4 The circuit diagram of the protection module 152 provided in this application is shown. The protection module 152 also includes a control circuit 1521, a charge / discharge switch M2, a pull-up switch M4, and a pull-down switch M5. The charge / discharge switch M2 includes a charging switch M3 and a discharging switch M2. The control circuit 1521 includes a power supply terminal, a charging control terminal, a discharging control terminal, a pull-up control terminal, and a pull-down control terminal.

[0050] The power supply terminal of control circuit 1521 is electrically connected to the power supply pin VDD of protection module 152. The charging control terminal of control circuit 1521 is electrically connected to the control terminal of charging switch M3. The discharging control terminal of control circuit 1521 is electrically connected to the control terminal of discharging switch M2. The pull-up control terminal of control circuit 1521 is electrically connected to the control terminal of pull-up switch M4. The pull-down control terminal of control circuit 1521 is electrically connected to the control terminal of pull-down switch M5.

[0051] The first terminal of the pull-up switch M4 receives a second voltage V+. In some embodiments, the second voltage V+ is the voltage at the first terminal of the battery 11. The second terminal of the pull-up switch M4 is electrically connected to the voltage detection pin VM of the protection module 152 through the pull-up resistor RPU. The first terminal of the pull-down switch M5 is electrically connected to the voltage detection pin VM of the protection module 152 through the pull-down resistor RDU. The second terminal of the pull-down switch M5 is grounded.

[0052] The first end of the discharge switch M2 is electrically connected to the battery 11 connection terminal of the protection module 152, and the second end of the discharge switch M2 is electrically connected to the output connection terminal of the protection module 152 through the charging switch M3.

[0053] When the voltage divider circuit does not receive a trigger signal, the voltage received by the power supply pin VDD of the protection module 152 is the first terminal voltage of the battery 11. Since the first terminal voltage of the battery 11 is greater than the over-discharge protection voltage threshold of the protection module 152, the control circuit 1521, in response to the voltage at the power supply terminal being greater than the over-discharge protection voltage threshold, controls the charging switch M3, the discharging switch M2, and the pull-down switch M5 to conduct, and controls the pull-up switch M4 to deactivate. At this time, the voltage at the voltage detection pin VM is pulled down to ground by the pull-down switch M5. The voltage regulator 12 outputs a power supply voltage to the accelerometer 13 and the microcontroller 14 based on the difference between the first terminal voltage of the battery 11 and the ground voltage. Since this power supply voltage is greater than the first voltage threshold, the accelerometer 13 and the microcontroller 14 operate normally.

[0054] When the voltage divider circuit receives a trigger signal, the voltage received by the power supply pin VDD of the protection module 152 is the first voltage of the battery 11. Since the first voltage is less than the over-discharge protection voltage threshold of the protection module 152, the control circuit 1521 responds to the voltage at the power supply terminal being less than the over-discharge protection voltage threshold and enters the over-discharge protection mode. At this time, the control circuit 1521 controls the charging switch M3 and / or the discharging switch M2 to open, the pull-down switch M5 to open, and the pull-up switch M4 to turn on. At this time, since the charging switch M3 and / or the discharging switch M2 are open, the electrical connection between the battery connection pin S1 and the output connection pin S2 is broken. At the same time, the voltage of the voltage detection pin VM is pulled up to the second voltage V+ by the pull-up switch M4. The power supply voltage is less than the first voltage threshold, and the accelerometer 13 and the microcontroller 14 cannot work normally, thereby saving the power consumption of the rechargeable device 10.

[0055] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A protection circuit for a rechargeable device, the rechargeable device further comprising a battery and an accelerometer, the accelerometer receiving a supply voltage and configured to output a power-on signal when the supply voltage is greater than a preset first voltage threshold and the acceleration of the rechargeable device is greater than the preset acceleration threshold, the power-on signal being used to control the rechargeable device to power on, characterized in that... The protection circuit includes: A voltage divider circuit is electrically connected to the first terminal of the battery. It is used to receive a trigger signal and divide the voltage at the first terminal of the battery according to the trigger signal to obtain a first voltage. A protection module, electrically connected to the voltage divider circuit, is used to adjust the supply voltage when the first voltage is received, so that the supply voltage is less than the first voltage threshold.

2. The protection circuit of claim 1, wherein, The protection module includes a control circuit, a power supply pin, and a voltage detection pin. The power supply pin is electrically connected to the output terminal of the voltage divider circuit. The control circuit is electrically connected to the power supply pin and the voltage detection pin. The control circuit is used for: When the first voltage is less than a preset second voltage threshold, the voltage of the voltage detection pin is adjusted to the second voltage to adjust the power supply voltage; Wherein, the supply voltage is less than the output voltage difference, the output voltage difference is the difference between the first terminal voltage of the battery and the voltage of the voltage detection pin, and the difference between the first terminal voltage of the battery and the second voltage is less than the first voltage threshold.

3. The protection circuit as described in claim 2, characterized in that, The rechargeable device further includes a voltage regulator, the input of which is electrically connected to the first terminal of the battery and the voltage detection pin, and the output of which is electrically connected to the acceleration sensor. The voltage regulator is used to output the supply voltage based on the difference between the voltage at the first terminal of the battery and the voltage at the voltage detection pin.

4. The protection circuit as described in claim 2, characterized in that, The voltage divider circuit includes a switching transistor, a first voltage divider resistor, and a second voltage divider resistor. The first end of the first voltage divider resistor is electrically connected to the first end of the battery. The second end of the first voltage divider resistor is electrically connected to one end of the second voltage divider resistor and the power supply pin of the protection module. The other end of the second voltage divider resistor is electrically connected to the first end of the switching transistor. The second end of the switching transistor is grounded. The control terminal of the switching transistor is used to receive the trigger signal. The switching transistor is turned on in response to the trigger signal.

5. The protection circuit as described in claim 2, characterized in that, The protection module further includes a pull-up switch and a pull-down switch. The first terminal of the pull-up switch receives the first terminal voltage of the battery, and the second terminal of the pull-up switch is electrically connected to the voltage detection pin. The first terminal of the pull-down switch is grounded, and the second terminal of the pull-down switch is electrically connected to the voltage detection pin. The control terminals of the pull-up switch and the pull-down switch are both electrically connected to the control circuit.

6. The protection circuit as described in claim 5, characterized in that, The control circuit is used for: When the first voltage is less than a preset second voltage threshold, the pull-up switch is turned on and the pull-down switch is turned off, so as to adjust the voltage of the voltage detection pin to the second voltage.

7. The protection circuit as described in claim 2, characterized in that, The protection module further includes a battery connection pin, an output connection pin, and a charge / discharge switch. The battery connection pin is electrically connected to the second terminal of the battery and ground. The output connection pin is electrically connected to the voltage detection pin. The charge / discharge switch is electrically connected between the battery connection pin and the output connection pin. The control circuit is used for: When the first voltage is less than a preset second voltage threshold, the charge / discharge switch is turned off.

8. The protection circuit as described in claim 3, characterized in that, The rechargeable device also includes a microcontroller, the power supply terminal of which is electrically connected to the output terminal of the voltage regulator, the sensing signal terminal of which is electrically connected to the accelerometer, and the trigger signal terminal of which is electrically connected to the voltage divider circuit. The microcontroller is used to control the rechargeable device to power on according to the power-on signal, and to output the trigger signal according to the preset over-discharge protection command.

9. The protection circuit as described in claim 4, characterized in that, The voltage divider circuit further includes a delay circuit, which includes a delay capacitor and a delay resistor. The first ends of the delay capacitor and the delay resistor are both electrically connected to the control terminal of the switching transistor. The second end of the delay capacitor is grounded, and the second end of the delay resistor receives the trigger signal.

10. A rechargeable device, characterized in that, Includes a battery, an acceleration sensor, a voltage regulator, a microcontroller, and a protection circuit as described in any one of claims 1 to 9; The voltage regulator is used to receive the first terminal voltage of the battery and output the power supply voltage according to the first terminal voltage of the battery and the voltage detection pin voltage of the protection module; The accelerometer receives the power supply voltage and outputs a power-on signal when the power supply voltage is greater than a preset first voltage threshold and the acceleration of the rechargeable device is greater than a preset acceleration threshold. The microcontroller receives the power supply voltage and controls the rechargeable device to power on according to the power-on signal, and outputs a trigger signal according to a preset over-discharge protection command; The protection circuit is used to adjust the power supply voltage according to the trigger signal so that the power supply voltage is less than the first voltage threshold.

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