A control system for a battery protection circuit

Abstract

The present invention relates to the technical field of power protection circuits, and particularly to a control system for a battery protection circuit, including: the input end of a battery protection unit is connected to a battery pack; an electronic switch unit, which is respectively connected to the battery pack and the battery protection unit, and the electronic switch unit is used to cut off the battery pack when the battery pack works abnormally; the input end of a control unit is connected to a power supply unit, and the output end of the control unit is connected to the electronic switch unit, and is used to control the start and stop of the electronic switch unit; the control unit specifically includes a key switch, a control circuit, and a microcontroller chip, and the microcontroller chip controls the start and stop of the electronic switch unit according to the pressing state of the key switch after power-on. Beneficial effects: Control the start and stop of the battery protection circuit to reduce the static power consumption of electronic products and increase the battery usage time; in addition, the control system has a reset function, and the system can be forcibly reset through the key switch when the system crashes or fails.

Description

Technical Field

[0001] The present invention relates to the technical field of power protection circuits, and particularly to a control system for a power protection circuit. Background Art

[0002] With the rapid development of electronic products, more and more electronic products need to be equipped with batteries. Such products focus on the battery life, so the power consumption of the circuit needs to be emphasized during the product design and development, especially the static power consumption in the standby or shutdown state. If the static power consumption is low, the storage time of the electronic product after being fully charged is longer, and the battery usage time is longer. Electronic products with batteries all have battery protection circuits. As Figure 1 shown, it is usually composed of a battery monitoring circuit and an electronic switch unit circuit. The battery is monitored in real time through the battery monitoring circuit to achieve short-circuit protection, over-current protection, overcharge protection, over-discharge protection, low-temperature protection, high-temperature protection, etc.

[0003] In the prior art, when the electronic product is in the standby or shutdown state, the battery protection circuit is still in the on state, which will increase the static power consumption of the system. In addition, there is no function for resetting the protection circuit in the prior art. Summary of the Invention

[0004] In view of the above problems existing in the prior art, a control system for a power protection circuit is provided.

[0005] The specific technical solution is as follows:

[0006] The present invention includes a control system for a battery protection circuit, including:

[0007] A battery protection unit, the input end of the battery protection unit is connected to a battery pack, and is used to monitor the working condition of the battery pack;

[0008] An electronic switch unit, which is respectively connected to the battery pack and the battery protection unit, and the electronic switch unit is used to cut off the battery pack when the battery pack works abnormally;

[0009] A control unit, the input end of the control unit is connected to a power supply unit, the output end of the control unit is connected to the electronic switch unit, and is used to control the opening or closing of the electronic switch unit. The control unit specifically includes:

[0010] A key switch;

[0011] A control circuit, the first input end of the control circuit is connected to the key switch, the output end of the control circuit is used as the output end of the control unit, and when the key switch is pressed, the control circuit will trigger the conduction of the electronic switch unit;

[0012] A microcontroller chip, the first input end of the microcontroller chip is connected to the key switch, the output end of the microcontroller chip is connected to the second input end of the control circuit, and the microcontroller chip is powered on after the electronic switch unit is turned on. The microcontroller chip outputs different control signals according to the pressing state of the key switch. When the microcontroller chip determines that the pressing time of the key switch reaches a first preset time, it outputs a control signal to control the start and stop of the electronic switch unit.

[0013] Preferably, the control unit is connected to the electronic switch unit through the battery protection unit.

[0014] Preferably, the control unit is directly connected to the electronic switch unit.

[0015] Preferably, the control unit further includes a reset unit. The input end of the reset unit is connected to the key switch, and the output end of the reset unit is connected to the third input end of the microcontroller chip. When the key switch is continuously pressed for a second preset time, the reset unit outputs a reset signal to the microcontroller chip to forcibly reset the microcontroller chip.

[0016] Preferably, the second preset time is greater than the first preset time.

[0017] Preferably, the control signal includes a high level or a low level:

[0018] When the control system is in the off state, the control signal is a high level, and the microcontroller chip outputs the high level to the control circuit to control the electronic switch unit to turn on;

[0019] When the control system is in the on state, the control signal is a low level, and the microcontroller chip outputs the low level to the control circuit to control the electronic switch unit to turn off.

[0020] Preferably, the control system further includes a charging management unit. The output end of the charging management unit is respectively connected to the battery input end of the power supply unit and the battery through the electronic switch unit.

[0021] The technical solution of the present invention has the following advantages or beneficial effects: The present invention provides a control system for a battery protection circuit to control the start and stop of the battery protection circuit, so as to reduce the static power consumption of electronic products and extend the battery usage time; in addition, the control system of the present invention has a reset function, and can forcibly reset the system through the key switch when the system crashes or fails, so that the system resumes normal operation. Description of the Drawings

[0022] With reference to the accompanying drawings, embodiments of the present invention will be more fully described. However, the accompanying drawings are only for illustration and explanation, and do not constitute a limitation on the scope of the present invention.

[0023] Figure 1 It is a schematic block diagram of a battery protection circuit in the prior art;

[0024] Figure 2 It is a schematic block diagram of the first control system in the embodiments of the present invention;

[0025] Figure 3 It is a schematic block diagram of the second control system in the embodiments of the present invention;

[0026] Figure 4 It is a power-on flowchart of the control system in the embodiments of the present invention;

[0027] Figure 5 It is a power-off flowchart of the control system in the embodiments of the present invention;

[0028] Figure 6 It is a circuit structure diagram of the first control system in the embodiments of the present invention;

[0029] Figure 7 It is a first type of circuit structure diagram of the second control system in the embodiments of the present invention;

[0030] Figure 8 It is a second type of circuit structure diagram of the second control system in the embodiments of the present invention. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0032] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0033] Next, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present invention.

[0034] The present invention includes a control system for a battery protection circuit, as Figure 2 and Figure 3 shown, including:

[0035] A battery protection unit 1, connected to a battery pack 2, and the battery protection unit 1 includes:

[0036] A battery protection unit 1, the input end of the battery protection unit 1 is connected to a battery pack 2, which is used to monitor the working condition of the battery pack 2;

[0037] An electronic switch unit 3, which is respectively connected to the battery pack 2 and the battery protection unit 1, and the electronic switch unit 3 is used to cut off the battery pack 2 when the battery pack 2 works abnormally;

[0038] A control unit 4, connected to the battery protection unit 1, is used to control the opening or closing of the electronic switch unit 3.

[0039] A battery protection unit 1, the input end of the battery protection unit 1 is connected to a battery pack 2, which is used to monitor the working condition of the battery pack 2;

[0040] An electronic switch unit 3, which is respectively connected to the battery pack 2 and the battery protection unit 1, and the electronic switch unit 3 is used to cut off the battery pack 2 when the battery pack 2 works abnormally;

[0041] A control unit 4, the input end of the control unit 4 is connected to a power supply unit 5, the output end of the control unit 4 is connected to the electronic switch unit 3, and is used to control the opening or closing of the electronic switch unit 3. The control unit 4 specifically includes:

[0042] A key switch 401;

[0043] A control circuit 403, the first input end of the control circuit 403 is connected to the key switch 401, and the output end of the control circuit 403 is used as the output end of the control unit 4. When the key switch 401 is pressed, the control circuit 403 will be triggered to turn on the electronic switch unit 3;

[0044] A microcontroller chip 402, the first input end of the microcontroller chip 402 is connected to the key switch 401, the output end of the MCU is connected to the second input end of the control circuit 403. After the electronic switch unit 3 is turned on, the MCU is powered on and starts to work. When the MCU is working, it will detect whether the key switch 401 is pressed. If it is in the pressed state, the MCU will output a PC_ON control signal to the control circuit 403 to replace the manual key switch 401. At this time, even if the user releases the key switch 401, the system power supply can still maintain normal operation because the PC_ON signal controls the control circuit 403 to turn on the electronic switch unit 3. Similarly, when the control system shuts down, after the user releases the key switch 401, the MCU stops outputting the PC_ON signal, and the entire control system loses power and enters the initial state. It should be noted that both the start and stop of the control system require pressing the key switch 401 for a first preset time to avoid mis-starting or mis-closing of the control system.

[0045] Specifically, the electronic switch unit 3 usually uses MOS transistors. When any abnormal condition such as overcharge, over-discharge, overcurrent, or short circuit occurs in the battery pack 2, the control unit 4 sends a control signal to the battery protection unit 1 to trigger the electronic switch unit 3 to turn off, so as to achieve the purpose of protecting the battery. After the electronic switch unit 3 is turned off, the battery pack 2 is disconnected from other circuits in the system. At this time, the power consumption of the battery pack 2 is minimized, which is basically equivalent to the self-discharge of the battery itself. The present invention realizes the lowest static power consumption after standby or shutdown based on this principle, and turns off the electronic switch unit 3 in the battery protection circuit after the system shuts down or goes into standby. However, when the user operates the power-on button, the electronic switch unit 3 should be able to be turned on so that the system can be normally powered. In this embodiment, the control unit 4 starts and stops the electronic switch unit 3 to reduce the static power consumption of the electronic product.

[0046] Specifically, this embodiment includes two structural forms of the control system. Figure 2 The first control system is shown. The output end of the MCU is connected to the battery protection unit 1 through the control circuit 403, and the battery protection unit 1 is connected to the electronic switch unit 3. This solution enables the battery protection unit 1 to turn off the electronic switch unit 3 by controlling the enable of the battery protection circuit, thereby realizing the start and stop of the battery protection unit 1 and reducing the static power consumption of the system. The specific circuit structure is as Figure 6 shown. When the control unit 4 is connected to the electronic switch unit 3 through the battery protection unit 1, the output end of the control unit 4 is connected to the fifth input pin CTL of the first chip U1 through the first triode Q1.

[0047] Specifically, as Figure 4As shown in the figure, when the user presses the key switch 401 in the shutdown state, the external power supply of the battery pack 2 supplies power to the control circuit 403 through the key switch 401. The control circuit 403 enables the battery protection unit 1 to turn on the electronic switch unit 3, and the battery pack 2 supplies power to the power supply unit through the electronic switch unit 3. At this time, the microcontroller unit (MCU) starts to power on and the program performs initialization. In order to reduce the accidental opening or closing caused by misoperation, in this embodiment, the key switch 401 is designed to be turned on or off by long pressing. During initialization, the MCU detects and determines whether the key switch 401 is in the long-press state. When the user presses the key switch 401 for the first preset time to turn on or off, the first preset time in this embodiment is preferably 3S. It should be noted that the key switch 401 in this embodiment can also be designed to turn on or off by short pressing. If the MCU determines that the key switch 401 is not in the long-press state, the shutdown program is executed and it returns to the shutdown or standby state; if it is in the long-press state, the PC_ON pin of the MCU outputs a high level to replace the key switch 401 and lock the control circuit. At this time, after the user releases the key switch 401, since the PC_ON pin of the MCU has locked the control circuit to be turned on, there will be no power-off, and the system enters the normal working state of startup.

[0048] As Figure 5 shown, in the system running state, after the user long presses the key switch 401, the MCU detects that the key switch is in the long-press state. After identifying it as a shutdown command, the shutdown program is executed. In the shutdown program, the MCU controls the PC_ON pin to output a low level and waits for the key switch 401 to bounce and release. Since both the PC_ON pin and the key switch 401 are in the off state, the control circuit turns off the protection circuit, and thus the electronic switch unit is turned off. At this time, the system is powered off. The entire control system basically only has the self-power consumption of the battery itself, achieving the purpose of minimizing the static power consumption.

[0049] Specifically, Figure 3 shown is the second control system in this embodiment. The control unit 4 is directly connected to the electronic switch unit 3. The control unit 4 directly controls the opening and closing of the electronic switch unit 3. At this time, the switch control signal of the control unit 4 and the switch control signal of the battery protection circuit 1 are in a logical "AND" relationship, that is, when both are turned on, the electronic switch unit 3 will be turned on; when any switch control signal is off (for example, the control unit 4 is turned off or the battery protection unit 1 is protected and turned off), the electronic switch unit 3 is in the off state. The second control system in this embodiment is applicable to circuits without an enabling function. The specific circuit structure is as Figure 7 and 8As shown, when the control unit 4 is directly connected to the electronic switch unit 3, the control system further includes: a third switching transistor S3, the gate of the third switching transistor S3 is connected to the output terminal of the control unit 4, the drain of the third switching transistor S3 is connected to the second output pin DSG of the first chip U1, and the source of the third switching transistor S3 is connected to the gate of the second switching transistor S2.

[0050] In a preferred embodiment, as Figure 2 and Figure 3 shown, the control system further includes a reset unit 6. The input terminal of the reset unit 6 is connected to the key switch 401, and the output terminal of the reset unit 6 is connected to the second input terminal of the microcontroller chip MCU. When the key switch 401 is continuously pressed for a second preset time, the reset unit 6 outputs a reset signal to the MCU to perform a forced reset on the MCU. The second preset time is preferably 10S. When the system freezes due to an accident, the control system can be reset by pressing and holding the key switch 401 for 10S. The key switch 401 controls the reset switch circuit through a delay circuit. When the delay time is reached, a control signal is output to the reset unit 6 to reset the control system.

[0051] Specifically, in the embodiment where the control unit 4 is connected to the electronic switch unit 3 through the battery protection unit 1, as Figure 6 shown, the reset unit 6 specifically includes: a second triode Q2. The base of Q2 is connected to the key switch K1 through a resistor R15 and a diode D2. The emitter of Q2 is connected to a resistor R16. The collector of Q2 is connected to the base of a third triode Q3 through a diode D3 and a resistor R19. The emitter of Q3 is grounded, and the collector of Q3 is connected to the input terminal of the MCU for inputting a reset control signal to the MCU.

[0052] As another preferred implementation manner, as Figure 7 and 8 shown, when the control unit 4 is directly connected to the electronic switch unit 3, as Figure 2 and 3 shown, the reset unit specifically includes: a fourth switching transistor S4. The drain of the fourth switching transistor S4 is connected to the input terminal of the MCU for inputting a reset control signal. The gate of S4 is connected to the key switch K1, and the source of S4 is grounded.

[0053] In a preferred embodiment, as Figure 2 and 3 shown, the control signal includes a high level or a low level. When the control system is in the off state, the control signal is a high level, and the microcontroller chip 402 outputs a high level to the control circuit to control the electronic switch unit 3 to turn on; when the control system is in the on state, the control signal is a low level, and the microcontroller chip 402 outputs a low level to the control circuit 403 to control the electronic switch unit 3 to turn off.

[0054] In a preferred embodiment, as Figure 2 and 3 shown, the control system further includes a charging management unit 7. The output end of the charging management unit 7 is respectively connected to the battery input end of the power supply unit 5 and the battery pack 2 through the electronic switch unit 3. In this embodiment, the charging management unit 7 serves as an external power source to provide a charging voltage for the battery pack. When the electronic switch unit 3 is turned off, the connection between the battery pack 2 and the charging management unit 7 and the power supply unit 5 is cut off. At this time, the control system is powered off, and the entire control system basically only has the self-power consumption of the battery itself, achieving the purpose of minimizing the static power consumption.

[0055] The beneficial effects of the technical solution of the present invention are as follows: The present invention provides a control system for a battery protection circuit, which is used to control the start and stop of the battery protection circuit to reduce the static power consumption of electronic products and improve the usage time of the battery; in addition, the control system of the present invention has a reset function, which can forcibly reset the system through a key switch when the system freezes or fails, so that the system resumes normal operation.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A control system for a battery protection circuit, characterized in that Comprising: A battery protection unit, the input end of the battery protection unit is connected to a battery pack, and is used for monitoring the working condition of the battery pack; An electronic switch unit, which is respectively connected to the battery pack and the battery protection unit, and the electronic switch unit is used for cutting off the battery pack when the battery pack works abnormally; A control unit, the input end of the control unit is connected to a power supply unit, the output end of the control unit is connected to the electronic switch unit through the battery protection unit, and is used for controlling the opening or closing of the electronic switch unit. The output end of the control unit is connected to the control signal input end of the battery protection unit through a first triode. The control unit specifically includes: A key switch; A control circuit, the first input end of the control circuit is connected to the key switch, and the output end of the control circuit is used as the output end of the control unit. When the key switch is pressed, the control circuit is triggered to conduct the electronic switch unit; A micro-control chip, the first input end of the micro-control chip is connected to the key switch, and the output end of the micro-control chip is connected to the second input end of the control circuit. After the electronic switch unit is conducted, the micro-control chip is powered on. The micro-control chip outputs different control signals according to the pressing state of the key switch. When the micro-control chip judges that the pressing time of the key switch reaches a first preset time, it outputs a control signal to control the start and stop of the electronic switch unit.

2. The control system according to claim 1, characterized in that, The control unit further includes a reset unit, the input end of the reset unit is connected to the key switch, and the output end of the reset unit is connected to the second input end of the micro-control chip. When the key switch is continuously pressed for a second preset time, the reset unit outputs a reset signal to the micro-control chip to perform a forced reset on the micro-control chip.

3. The control system according to claim 2, characterized in that, The second preset time is greater than the first preset time.

4. The control system according to claim 1, characterized in that, The control signal includes a high level or a low level: When the control system is in the off state, the control signal is a high level, and the micro-control chip outputs the high level to the control circuit to control the opening of the electronic switch unit; When the control system is in the on state, the control signal is a low level, and the micro-control chip outputs the low level to the control circuit to control the closing of the electronic switch unit.

5. The control system according to claim 1, characterized in that The control system further includes a charging management unit, the output end of the charging management unit is respectively connected to the battery input end of the power supply unit and the battery through the electronic switch unit.

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