Power supply protection circuit, energy storage equipment and power supply protection method

Abstract

The invention provides a power supply protection circuit, energy storage equipment and a power supply protection method. The power supply protection circuit comprises a fuse, a heating circuit and a control circuit. The control circuit is used for outputting a first control signal within a first preset duration to control the heating circuit to heat the fuse to a first preset temperature; the control circuit is further used for outputting a second control signal within a second preset duration after the first preset duration, and the second control signal is used for controlling the heating circuit to heat the fuse to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the heating power corresponding to the second control signal is greater than the heating power corresponding to the first control signal. According to the application, the first control signal with relatively low power is output within the first preset duration to control the heating circuit to heat the fuse to the first preset temperature with relatively low heating power; and then a second control signal is output to control the heating circuit to continuously heat the fuse to a second preset temperature with relatively high heating power.

Description

Technical Field

[0001] The present application relates to the field of fuses, and in particular to a power supply protection circuit, an energy storage device, and a power supply protection method. Background Art

[0002] In the power protection circuit of electronic equipment, the conventional fusing method is to add the total voltage of the battery to the heating resistor of the three-terminal fuse, and heat the three-terminal fuse at maximum power until it blows. However, due to different heat dissipation environments, different heating resistance values, different total battery voltages, and different ambient temperatures, the heating time required for the three-terminal fuse to blow is different. If the heating time is long, the heating part will blow before the main circuit. At this time, the main circuit is still conducting, and the three-terminal fuse cannot play its due protective role. Summary of the invention

[0003] In order to solve the problems in the prior art, the present application provides a power protection circuit, an energy storage device and a power protection method.

[0004] The present application provides a power protection circuit, the power protection circuit comprising:

[0005] Fuse;

[0006] A heating circuit, used for heating the fuse;

[0007] A control circuit is electrically connected to the heating circuit; the control circuit is used to output a first control signal within a first preset time period, the first control signal is used to control the heating circuit to heat the fuse to a first preset temperature; the control circuit is also used to output a second control signal within a second preset time period after the first preset time period, the second control signal is used to control the heating circuit to heat the fuse to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the heating power corresponding to the second control signal is greater than the heating power corresponding to the first control signal.

[0008] In one embodiment, the first end of the fuse is used to be electrically connected to the battery pack;

[0009] The control circuit is used to output the first control signal within the first preset time period when the voltage of the battery pack is greater than a preset voltage, and to output the second control signal within a second preset time period after the first preset time period ends.

[0010] In one embodiment, the power protection circuit further includes a voltage detection circuit;

[0011] The voltage detection circuit is electrically connected to the control circuit and the battery pack respectively; the voltage detection circuit is used to detect the voltage of the battery pack.

[0012] In one embodiment, the power protection circuit further includes a first switch circuit;

[0013] The first switch circuit is electrically connected to the heating circuit and the control circuit respectively; the first switch circuit is used to control on / off based on the first control signal or the second control signal, and output a corresponding drive signal to drive the heating circuit to work.

[0014] In one embodiment, the power protection circuit further includes a temperature detection circuit;

[0015] The temperature detection circuit is used to detect the current temperature of the fuse;

[0016] The control circuit is also used to determine the first preset time length and the duty cycle of the first control signal according to the current temperature and the first preset temperature; and to determine the second preset time length and the duty cycle of the second control signal according to the second preset temperature and the first preset temperature.

[0017] In one embodiment, the power protection circuit further includes a heat sink;

[0018] The heat sink is used to dissipate heat from the fuse.

[0019] In one embodiment, the power protection circuit further includes a second switch circuit;

[0020] A first end of the second switch circuit is electrically connected to the battery pack, a second end of the second switch circuit is electrically connected to the first end of the fuse, and a third end of the second switch circuit is electrically connected to the control circuit;

[0021] The control circuit is further configured to control the second switch circuit to be disconnected when the voltage of the battery pack is greater than a preset voltage.

[0022] The present application also proposes an energy storage device, which includes a battery pack and the above-mentioned power protection circuit.

[0023] The present application also proposes a power supply protection method, which is applied to a power supply protection circuit, wherein the power supply protection circuit includes a heating circuit and a fuse, and the power supply protection method includes:

[0024] Outputting a first control signal to the heating circuit within a first preset time period, wherein the first control signal is used to control the heating circuit to heat the fuse to a first preset temperature;

[0025] After the first preset time period ends, a second control signal is output to the heating circuit within a second preset time period, and the second control signal is used to control the heating circuit to heat the fuse to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the heating power corresponding to the second control signal is greater than the heating power corresponding to the first control signal.

[0026] In one embodiment, the power protection method further includes:

[0027] Obtaining the current temperature of the fuse;

[0028] Determining the first preset time duration according to the current temperature and the first preset temperature;

[0029] The second preset time period is determined according to the second preset temperature and the first preset temperature.

[0030] The present application outputs a first control signal of lower power within a first preset time period to control the heating circuit to heat the fuse to a first preset temperature at a lower heating power; and then outputs a second control signal to control the heating circuit to continue to heat the fuse to a second preset temperature at a higher heating power. This can effectively reduce the time the heating circuit works at a higher heating power, thereby avoiding the situation where the heating circuit works at a higher heating power for a longer time and breaks before the fuse when the fuse is affected by the ambient temperature and the fuse breaks for a longer time, thereby ensuring that the fuse can be broken reliably and effectively to achieve the protection function. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a module structure diagram of the power protection circuit of an embodiment of the present application.

[0032] Figure 2 This is a flow chart of a power protection method according to an embodiment of the present application.

[0033] Figure 3 This is a flow chart of a power protection method according to an embodiment of the present application.

[0034] Main component symbols

[0035] Power protection circuit 100 Fuse 110

[0036] Heating circuit 120 Control circuit 130

[0037] Battery pack 200 Voltage detection circuit 140

[0038] Radiator 150 First switch circuit 160

[0039] Temperature detection circuit 170 Second switch circuit 180

[0040] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0041] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0042] Reference Figure 1 The present application proposes a power protection circuit 100, which includes a fuse 110, a heating circuit 120 and a control circuit 130. The heating circuit 120 is used to heat the fuse 110. The control circuit 130 is electrically connected to the heating circuit 120. The control circuit 130 is used to output a first control signal within a first preset time period, and the first control signal is used to control the heating circuit 120 to heat the fuse 110 to a first preset temperature; the control circuit 130 is also used to output a second control signal within a second preset time period after the first preset time period ends, and the second control signal is used to control the heating circuit 120 to heat the fuse 110 to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the power of the second control signal is greater than the power of the first control signal.

[0043] In this embodiment, the power protection circuit 100 can be applied to devices such as a battery pack 200, a charger, and household appliances. When the protection object circuit works normally, the working current can be transmitted through the fuse 110. When the protection object circuit is abnormal, such as overcurrent, overvoltage, etc., the fuse 110 can be controlled to disconnect to achieve the protection function.

[0044] For example, the first end of the fuse 110 can be electrically connected to the battery pack 200. The power protection circuit 100 can also include a voltage detection circuit 140. The voltage detection circuit 140 is electrically connected to the control circuit 130 and the battery pack 200 respectively; the voltage detection circuit 140 is used to detect the voltage of the battery pack 200. When the voltage of the battery pack 200 is less than the preset voltage, the voltage output by the battery pack 200 can be output to other circuits through the fuse 110, and the external charging voltage can also be transmitted to the battery pack 200 through the fuse 110. At this time, the fuse 110 will heat up due to the large current passing through it. A heat sink 150 can be set at a position close to the fuse 110 to dissipate heat for the fuse 110 to prevent the fuse 110 from heating up and melting due to the normal working current passing through it.

[0045] When the voltage of the battery pack 200 is greater than the preset voltage, the controller outputs a first control signal within a first preset time period, and the first control signal is used to control the heating circuit 120 to heat the fuse 110 to a first preset temperature; after the first preset time period ends, the controller outputs a second control signal within a second preset time period, and the second control signal is used to control the heating circuit 120 to heat the fuse 110 to a second preset temperature.

[0046] The heating circuit 120 can be implemented by a resistor. The heating circuit 120 is set close to the fuse 110. When the fuse 110 needs to be disconnected for protection, the control circuit 130 first outputs a first control signal with a lower power within a first preset time to control the heating circuit 120 to heat the fuse 110 to a first preset temperature. At this time, the heating power of the heating circuit 120 is not the maximum power, and the heating circuit 120 can work at a lower power for a long time. After the first preset time ends, that is, after the fuse 110 is heated to the first preset temperature, the control circuit 130 outputs a second control signal with a higher power to control the heating power to heat the fuse 110 from the first preset temperature to the second preset temperature, so that the fuse 110 reaches the melting temperature and is disconnected. The second preset temperature can be set according to the melting temperature of the fuse 110, and the first preset temperature can be set to a value close to the second preset temperature. For example, the second preset temperature can be set to 100°C, and the first preset temperature can be set to 80°C.

[0047] It is understandable that the greater the heating power, the faster the temperature rises. By setting the power of the first control signal to be less than the power of the second control signal, the heating power of the first preset duration is less than the heating power of the second preset duration. In other words, the heating circuit 120 only needs to work at a larger heating power within the second preset duration, thereby reducing the duration of the heating circuit 120 working at a larger heating power, thereby reducing the possibility of the heating circuit 120 blowing before the fuse 110, and improving the reliability of the heating circuit 120.

[0048] Furthermore, the first control signal and the second control signal may be PWM signals. By adjusting the duty cycle of the PWM signal, its output power can be adjusted, thereby adjusting the heating power of the heating circuit 120. For example, the resistance of the heating circuit 120 is R, the duty cycle of the PWM signal is D, and the total voltage of the battery pack 200 is V, then the average heating power P = (V*D)^2 / R. By increasing the duty cycle of the PWM signal, the average heating power of the heating circuit 120 also increases. Compared with the heating circuit 120 always heating the fuse 110 with the maximum heating power, this embodiment can further reduce the total heating power by setting the heating power within the first preset time length to be less than the heating power within the second preset time length.

[0049] In one embodiment, the power protection circuit 100 may further include a first switch circuit 160. The first switch circuit 160 is electrically connected to the heating circuit 120 and the control circuit 130 respectively; the first switch circuit 160 is used to control on / off based on the first control signal or the second control signal, and output a corresponding drive signal to drive the heating circuit 120 to work.

[0050] In this embodiment, the first switch circuit 160 can be implemented by a field effect transistor. The first switch circuit 160 has different conduction rates under the control of PWM signals with different duty ratios. When the duty ratio of the PWM signal is large, the total conduction time of the first switch circuit 160 is long, the total current of the output drive signal is large, and thus the heating power of the heating circuit 120 is large.

[0051] In one embodiment, the power protection circuit 100 further includes a temperature detection circuit 170. The temperature detection circuit 170 is used to detect the current temperature of the fuse 110. The control circuit 130 is also used to determine the first preset time length and the power of the first control signal according to the current temperature and the first preset temperature; and determine the second preset time length and the power of the second control signal according to the second preset temperature and the first preset temperature.

[0052] In this embodiment, the temperature detection circuit 170 can be arranged near the fuse 110, and can be implemented by a temperature sensor. It can be understood that when the initial temperature and the target temperature are the same, the heating time is inversely proportional to the heating power. Regarding the corresponding relationship between the current temperature of the fuse 110, the first preset time and the power of the first control signal, the heating circuit 120 can be controlled by using the first control signal with different powers at different temperatures to heat the fuse 110 to the first preset temperature, and the current temperature of the fuse 110, the first preset time and the power data of the first control signal are recorded to obtain a first relationship table. Regarding the corresponding relationship between the second preset time and the power of the second control signal, the heating circuit 120 can be controlled by using the second control signal with different powers at the first preset temperature to heat the fuse 110 to the second preset temperature, and the second preset time of the fuse 110 and the power data of the second control signal are recorded to obtain a second relationship table. The first relationship table and the second relationship table are pre-stored in the control circuit 130. When the fuse 110 needs to be controlled to be disconnected, the control circuit 130 can select appropriate parameters according to the first relationship table and the second relationship table so that the fuse 110 can be disconnected quickly, and the heating circuit 120 can be prevented from disconnecting before the fuse 110. For example, the current temperature of the fuse 110 is 25°C, the first preset temperature is 80°C, the second preset temperature is 100°C, the first preset time can be set to 2s, the power of the first control signal is 300W, the second preset time is 1s, and the power of the second control signal is 500W.

[0053] The present application outputs a first control signal with lower power within a first preset time period to control the heating circuit 120 to heat the fuse 110 to a first preset temperature with a lower heating power; and then outputs a second control signal to control the heating circuit 120 to continue to heat the fuse 110 to a second preset temperature with a higher heating power. This can effectively reduce the time period for which the heating circuit 120 operates at a higher heating power, thereby avoiding the situation where the heating circuit 120 operates at a higher heating power for a longer time and disconnects before the fuse 110 when the fuse duration is longer due to the influence of ambient temperature, thereby ensuring that the fuse 110 can be disconnected reliably and effectively to achieve the protection function.

[0054] In one embodiment, the power protection circuit 100 further includes a second switch circuit 180. A first end of the second switch circuit 180 is electrically connected to the battery pack 200, a second end of the second switch circuit 180 is electrically connected to a first end of the fuse 110, and a third end of the second switch circuit 180 is electrically connected to the control circuit 130. The control circuit 130 is also used to control the second switch circuit 180 to disconnect when the voltage of the battery pack 200 is greater than a preset voltage.

[0055] In this embodiment, the second switch circuit 180 can be implemented by a field effect transistor. The second switch circuit 180 is arranged between the battery pack 200 and the fuse 110. When the battery pack 200 has abnormal conditions such as overcharge and overcurrent, the control circuit 130 first controls the second switch circuit 180 to disconnect, thereby realizing the primary protection of the battery pack 200. If the second switch circuit 180 is short-circuited by a large current breakdown, or other faults occur and cannot be disconnected normally, the control circuit 130 outputs a first control signal within a first preset time length, and after the first preset time length ends, outputs a second control signal within a second preset time length to control the heating circuit 120 to heat the fuse 110 until it is melted, thereby realizing the secondary protection of the battery pack 200.

[0056] The present application also proposes an energy storage device, which includes a battery pack 200 and the above-mentioned power protection circuit 100 .

[0057] The detailed structure of the power protection circuit 100 can refer to the above-mentioned embodiment, which will not be described in detail here; it can be understood that since the above-mentioned power protection circuit 100 is used in the energy storage device of the present application, the embodiment of the energy storage device of the present application includes all technical solutions of all embodiments of the above-mentioned power protection circuit 100, and the technical effects achieved are also exactly the same, which will not be described in detail here.

[0058] Reference Figure 2 The present application also proposes a power protection method, which is applied to a power protection circuit 100. The power protection circuit 100 includes a heating circuit 120 and a fuse 110. The power protection method includes:

[0059] Outputting a first control signal to the heating circuit 120 within a first preset time period, the first control signal being used to control the heating circuit 120 to heat the fuse 110 to a first preset temperature;

[0060] After the first preset time period ends, a second control signal is output to the heating circuit 120 within a second preset time period, and the second control signal is used to control the heating circuit 120 to heat the fuse 110 to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the power of the second control signal is greater than the power of the first control signal.

[0061] In this embodiment, the power protection circuit 100 can be applied to devices such as a battery pack 200, a charger, and household appliances. When the protection object circuit works normally, the working current can be transmitted through the fuse 110. When the protection object circuit is abnormal, such as overcurrent, overvoltage, etc., the fuse 110 can be controlled to disconnect to achieve the protection function.

[0062] For example, the first end of the fuse 110 can be electrically connected to the battery pack 200. The power protection circuit 100 can also include a voltage detection circuit 140. The voltage detection circuit 140 is electrically connected to the control circuit 130 and the battery pack 200 respectively; the voltage detection circuit 140 is used to detect the voltage of the battery pack 200. When the voltage of the battery pack 200 is less than the preset voltage, the voltage output by the battery pack 200 can be output to other circuits through the fuse 110, and the external charging voltage can also be transmitted to the battery pack 200 through the fuse 110. At this time, the fuse 110 will heat up due to the large current passing through it. A heat sink 150 can be set at a position close to the fuse 110 to dissipate heat for the fuse 110 to prevent the fuse 110 from heating up and melting due to the normal working current passing through it.

[0063] When the voltage of the battery pack 200 is greater than the preset voltage, the controller outputs a first control signal within a first preset time period, and the first control signal is used to control the heating circuit 120 to heat the fuse 110 to a first preset temperature; after the first preset time period ends, the controller outputs a second control signal within a second preset time period, and the second control signal is used to control the heating circuit 120 to heat the fuse 110 to a second preset temperature.

[0064] The heating circuit 120 can be implemented by a resistor. The heating circuit 120 is set close to the fuse 110. When the fuse 110 needs to be disconnected for protection, the control circuit 130 first outputs a first control signal with a lower power within a first preset time to control the heating circuit 120 to heat the fuse 110 to a first preset temperature. At this time, the heating power of the heating circuit 120 is not the maximum power, and the heating circuit 120 can work at a lower power for a long time. After the first preset time ends, that is, after the fuse 110 is heated to the first preset temperature, the control circuit 130 outputs a second control signal with a higher power to control the heating power to heat the fuse 110 from the first preset temperature to the second preset temperature, so that the fuse 110 reaches the melting temperature and is disconnected. The second preset temperature can be set according to the melting temperature of the fuse 110, and the first preset temperature can be set to a value close to the second preset temperature. For example, the second preset temperature can be set to 100°C, and the first preset temperature can be set to 80°C.

[0065] It is understandable that the greater the heating power, the faster the temperature rises. By setting the power of the first control signal to be less than the power of the second control signal, the heating power of the first preset duration is less than the heating power of the second preset duration. In other words, the heating circuit 120 only needs to work at a larger heating power within the second preset duration, thereby reducing the duration of the heating circuit 120 working at a larger heating power, thereby reducing the possibility of the heating circuit 120 blowing before the fuse 110, and improving the reliability of the heating circuit 120.

[0066] Furthermore, the first control signal and the second control signal may be PWM signals. By adjusting the duty cycle of the PWM signal, its output power can be adjusted, thereby adjusting the heating power of the heating circuit 120. For example, the resistance of the heating circuit 120 is R, the duty cycle of the PWM signal is D, and the total voltage of the battery pack 200 is V, then the average heating power P = (V*D)^2 / R. By increasing the duty cycle of the PWM signal, the output power of the PWM signal increases, and the average heating power of the heating circuit 120 also increases accordingly. Compared with the heating circuit 120 always heating the fuse 110 with the maximum heating power, this embodiment can further reduce the total heating power by setting the heating power within the first preset time length to be less than the heating power within the second preset time length.

[0067] Reference Figure 3 In one embodiment, the power supply protection method further includes:

[0068] Get the current temperature of the fuse 110;

[0069] Determine a first preset time duration according to the current temperature and the first preset temperature;

[0070] The second preset time period is determined according to the second preset temperature and the first preset temperature.

[0071] In this embodiment, the power protection circuit 100 further includes a temperature detection circuit 170. The temperature detection circuit 170 is used to detect the current temperature of the fuse 110. The control circuit 130 is also used to determine the first preset time length and the power of the first control signal according to the current temperature and the first preset temperature; and determine the second preset time length and the power of the second control signal according to the second preset temperature and the first preset temperature.

[0072] The temperature detection circuit 170 can be arranged near the fuse 110, and can be implemented by a temperature sensor. It can be understood that when the initial temperature and the target temperature are the same, the heating time is inversely proportional to the heating power. Regarding the corresponding relationship between the current temperature of the fuse 110, the first preset time and the power of the first control signal, the heating circuit 120 can be controlled by using the first control signal with different powers at different temperatures to heat the fuse 110 to the first preset temperature, and the current temperature of the fuse 110, the first preset time and the power data of the first control signal are recorded to obtain a first relationship table. Regarding the corresponding relationship between the second preset time and the power of the second control signal, the heating circuit 120 can be controlled by using the second control signal with different powers at the first preset temperature to heat the fuse 110 to the second preset temperature, and the second preset time of the fuse 110 and the power data of the second control signal are recorded to obtain a second relationship table. The first relationship table and the second relationship table are pre-stored in the control circuit 130. When the fuse 110 needs to be controlled to be disconnected, the control circuit 130 can select appropriate parameters according to the first relationship table and the second relationship table so that the fuse 110 can be disconnected quickly, and the heating circuit 120 can be prevented from disconnecting before the fuse 110. For example, the current temperature of the fuse 110 is 25°C, the first preset temperature is 80°C, the second preset temperature is 100°C, the first preset time can be set to 2s, the power of the first control signal is 300W, the second preset time is 1s, and the power of the second control signal is 500W.

[0073] The present application outputs a first control signal with lower power within a first preset time period to control the heating circuit 120 to heat the fuse 110 to a first preset temperature with a lower heating power; and then outputs a second control signal to control the heating circuit 120 to continue to heat the fuse 110 to a second preset temperature with a higher heating power. This can effectively reduce the time period for which the heating circuit 120 operates at a higher heating power, thereby avoiding the situation where the heating circuit 120 operates at a higher heating power for a longer time and disconnects before the fuse 110 when the fuse duration is longer due to the influence of ambient temperature, thereby ensuring that the fuse 110 can be disconnected reliably and effectively to achieve the protection function.

[0074] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A power protection circuit, characterized in that: The power protection circuit comprises: Fuse; A heating circuit, used for heating the fuse; A control circuit is electrically connected to the heating circuit; the control circuit is used to output a first control signal within a first preset time period, the first control signal is used to control the heating circuit to heat the fuse to a first preset temperature; the control circuit is also used to output a second control signal within a second preset time period after the first preset time period, the second control signal is used to control the heating circuit to heat the fuse to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the heating power corresponding to the second control signal is greater than the heating power corresponding to the first control signal.

2. The power protection circuit according to claim 1, characterized in that: The first end of the fuse is used to be electrically connected to the battery pack; The control circuit is used to output the first control signal within the first preset time period when the voltage of the battery pack is greater than a preset voltage, and to output the second control signal within a second preset time period after the first preset time period ends.

3. The power protection circuit according to claim 2, characterized in that: The power protection circuit also includes a voltage detection circuit; The voltage detection circuit is electrically connected to the control circuit and the battery pack respectively; the voltage detection circuit is used to detect the voltage of the battery pack.

4. The power protection circuit according to claim 1, characterized in that: The power protection circuit also includes a first switch circuit; The first switch circuit is electrically connected to the heating circuit and the control circuit respectively; the first switch circuit is used to control on / off based on the first control signal or the second control signal, and output a corresponding drive signal to drive the heating circuit to work.

5. The power protection circuit according to claim 1, characterized in that: The power protection circuit also includes a temperature detection circuit; The temperature detection circuit is used to detect the current temperature of the fuse; The control circuit is further used to determine the first preset time length and the duty cycle of the first control signal according to the current temperature and the first preset temperature; And determining the second preset time length and the duty cycle of the second control signal according to the second preset temperature and the first preset temperature.

6. The power protection circuit according to claim 1, characterized in that: The power protection circuit also includes a heat sink; The heat sink is used to dissipate heat from the fuse.

7. The power protection circuit according to claim 2, characterized in that: The power protection circuit also includes a second switch circuit; A first end of the second switch circuit is electrically connected to the battery pack, a second end of the second switch circuit is electrically connected to the first end of the fuse, and a third end of the second switch circuit is electrically connected to the control circuit; The control circuit is further configured to control the second switch circuit to be disconnected when the voltage of the battery pack is greater than a preset voltage.

8. An energy storage device, characterized in that: The energy storage device comprises a battery pack and a power protection circuit as claimed in any one of claims 1 to 7.

9. A power supply protection method, applied to a power supply protection circuit, wherein the power supply protection circuit comprises a heating circuit and a fuse, characterized in that: The power protection method comprises: Outputting a first control signal to the heating circuit within a first preset time period, wherein the first control signal is used to control the heating circuit to heat the fuse to a first preset temperature; After the first preset time period ends, a second control signal is output to the heating circuit within a second preset time period, and the second control signal is used to control the heating circuit to heat the fuse to a second preset temperature; the second preset temperature is greater than the first preset temperature, and the heating power corresponding to the second control signal is greater than the heating power corresponding to the first control signal.

10. The power protection method according to claim 9, characterized in that: The power protection method further includes: Obtaining the current temperature of the fuse; determining the first preset time duration according to the current temperature and the first preset temperature; The second preset time period is determined according to the second preset temperature and the first preset temperature.

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