CN210927172U - Wake-up circuit of lithium battery management system - Google Patents

Wake-up circuit of lithium battery management system Download PDF

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Publication number
CN210927172U
CN210927172U CN201922236943.5U CN201922236943U CN210927172U CN 210927172 U CN210927172 U CN 210927172U CN 201922236943 U CN201922236943 U CN 201922236943U CN 210927172 U CN210927172 U CN 210927172U
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electronic switch
circuit
resistor
mosfet
battery management
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CN201922236943.5U
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Chinese (zh)
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姚晋
韩金奎
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Shenzhen Ruinong Technology Service Co ltd
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Shenzhen Ruinong Technology Service Co ltd
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Abstract

The utility model discloses a lithium battery management system's awakening circuit, including first electronic switch, second electronic switch and voltage stabilizing circuit, first electronic switch's drive end is used for connecting the negative pole of lithium cell group, first electronic switch's output is used for connecting the charger negative pole, second electronic switch's drive end is connected to first electronic switch's input, second electronic switch's input is used for connecting the power, second electronic switch's output is connected with the voltage stabilizing circuit input, voltage stabilizing circuit's output is used for connecting battery management system's input. The utility model provides a lithium battery management system's awakening circuit when the charger inserts, awakens up battery management system.

Description

Wake-up circuit of lithium battery management system
Technical Field
The utility model relates to a battery management technical field, specifically speaking relates to a lithium battery management system's awakening circuit.
Background
The charge and discharge protection of a lithium Battery is an important component of a Battery Management System (BMS), and can prolong the service life of the lithium Battery.
Because the prior art does not set the battery management system in the lowest power consumption mode (shutdown mode), the battery management system is usually in the working state all the time, and thus the overall static power consumption of the battery management system is relatively high, and the lower power consumption requirement of a customer cannot be met. In order to achieve the minimum low power consumption, the battery management system needs to be set to the lowest power consumption mode (shutdown mode), and at this time, to restore the normal operation of the battery management system, the battery management system needs to be awakened.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a lithium battery management system's awakening circuit when the charger inserts, awakens battery management system up.
The utility model discloses a lithium battery management system's awakening circuit adopted's technical scheme is:
the utility model provides a lithium battery management system's awakening circuit, includes first electronic switch, second electronic switch and voltage stabilizing circuit, first electronic switch's drive end is used for connecting the negative pole of lithium cell group, first electronic switch's output is used for connecting the charger negative pole, second electronic switch's drive end is connected to first electronic switch's input, second electronic switch's input is used for connecting the power, second electronic switch's output and voltage stabilizing circuit input are connected, voltage stabilizing circuit's output is used for connecting battery management system's input.
Preferably, the first electronic switch comprises an N-MOSFET Q3, a zener diode Z3, a resistor R6 and a resistor R7, the source of the N-MOSFET Q3 is connected with one end of a resistor R7 and the anode of a zener diode Z3, the other end of the resistor R7 is connected with the cathode of the charger, the gate of the N-MOSFET Q3 is connected with one end of a resistor R6 and the cathode of the zener diode Z3, the other end of the resistor R6 is connected with the cathode of the lithium battery, and the drain of the N-MOSFET Q3 is connected with the driving end of the second electronic switch.
Preferably, the resistor R7 is further connected in series with a reverse protection diode D3.
Preferably, the second electronic switch comprises a P-MOSFET Q2, a resistor R4 and a zener diode Z1, the source of the P-MOSFET Q2 is connected with the cathode of the zener diode Z1 and then used for connecting a power supply, the drain of the P-MOSFET Q2 is connected with the input end of the voltage stabilizing circuit, the gate of the P-MOSFET Q2 is connected with the input end of the first electronic switch, and the resistor R4 is connected in parallel with two ends of the zener diode Z1.
Preferably, the voltage stabilizing circuit comprises a clamping circuit, a capacitor C1 and a zener diode Z2, wherein the input end of the clamping circuit is connected with one end of the capacitor C1 and the negative electrode of the zener diode Z2, the output end of the clamping circuit and the positive electrode of the zener diode Z2 are grounded, and the other end of the capacitor C1 is used for being connected with the input end of a battery management system.
Preferably, the clamping circuit comprises a plurality of diodes connected in series.
Preferably, a reverse protection diode D2 is further connected in series between the first electronic switch and the second electronic switch.
Preferably, the lithium battery pack power supply further comprises a power supply access circuit, the power supply access circuit comprises a diode D1, a resistor R1, a resistor R2, a resistor R3 and an N-MOSFET Q1, the drain of the N-MOSFET Q1 is connected in series with the resistor RI and then connected with the cathode of the diode D1, the anode of the diode D1 is used for connecting the anode of the lithium battery pack, the gate of the N-MOSFET Q1 is connected in series with the resistor R3 and then connected with the anode of the lithium battery unit, and the source of the N-MOSFET Q1 is connected in series with the resistor R2 and then connected with the input end of the second electronic switch.
The utility model discloses a lithium battery management system's wake-up circuit's beneficial effect is: after the charger is connected, the output voltage of the charger is higher than the voltage of the lithium battery pack, so that the voltage of the driving end of the first electronic switch is higher than the voltage of the output end of the first electronic switch, the first electronic switch is conducted, the voltage of the driving end of the second electronic switch is reduced, the second electronic switch is conducted, the voltage is output to the voltage stabilizing circuit, the voltage stabilizing circuit outputs the voltage to the input end of the battery management system after stabilizing the voltage, and the battery management system is awakened.
Drawings
Fig. 1 is a schematic circuit diagram of the wake-up circuit of the lithium battery management system of the present invention.
Fig. 2 is an application schematic diagram of the wake-up circuit of the lithium battery management system of the present invention.
Detailed Description
The invention will be further elucidated and described with reference to the following embodiments and drawings in which:
referring to fig. 1 and 2, the wake-up circuit of the lithium battery management system includes a first electronic switch 10, a second electronic switch 20, and a voltage stabilizing circuit 30, where a driving end of the first electronic switch is used to connect a negative electrode of the lithium battery pack, an output end of the first electronic switch is used to connect a negative electrode of the charger, an input end of the first electronic switch is connected to a driving end of the second electronic switch, an input end of the second electronic switch is used to connect a power supply, an output end of the second electronic switch is connected to an input end of the voltage stabilizing circuit, and an output end of the voltage stabilizing circuit is used to connect an input end of the battery management system.
After the charger is connected, the output voltage of the charger is higher than the voltage of the lithium battery pack, so that the voltage of the driving end of the first electronic switch is higher than the voltage of the output end of the first electronic switch, the first electronic switch is conducted, the voltage of the driving end of the second electronic switch is reduced, the second electronic switch is conducted, the voltage is output to the voltage stabilizing circuit, the voltage stabilizing circuit outputs the voltage to the input end of the battery management system after stabilizing the voltage, and the battery management system is awakened. The battery management system includes a model bq769x0 series battery management chip.
The wake-up circuit of the lithium battery management system further comprises a power access circuit 40 for supplying power to the wake-up circuit, and the lithium battery pack comprises a plurality of lithium battery cells connected in series. The power supply access circuit comprises a diode D1, a resistor R1, a resistor R2, a resistor R3 and an N-MOSFET tube Q1. The drain of the N-MOSFET Q1 is connected in series with the resistor RI and then connected with the cathode of the diode D1, and the anode of the diode D1 is used for connecting the anode of the lithium battery pack. The grid electrode of the N-MOSFET Q1 is connected in series with the resistor R3 and then used for being connected with the anode of the lithium battery unit. The source of the N-MOSFET Q1 is connected in series with the resistor R2 and then connected with the input end of the second electronic switch.
The battery pack can be powered from BAT +, namely the anode of the lithium battery pack, and the battery pack, namely the anode of one lithium battery unit, is not directly used as a power supply voltage input end, so that the power consumption of the whole lithium battery pack can be balanced.
The first electronic switch comprises an N-MOSFET Q3, a zener diode Z3, a resistor R6 and a resistor R7, the source electrode of the N-MOSFET Q3 is connected with one end of a resistor R7 and the anode of the zener diode Z3, the other end of the resistor R7 is connected with the cathode of a charger, the grid electrode of the N-MOSFET Q3 is connected with one end of a resistor R6 and the cathode of the zener diode Z3, the other end of the resistor R6 is connected with the cathode of a lithium battery pack, and the drain electrode of the N-MOSFET Q3 is connected with the driving end of the second electronic switch. The resistor R7 is also connected in series with a reverse protection diode D3.
When the charger is not connected, the N-MOSFET Q3 is suspended due to the CHG input end, so that the N-MOSFET Q3 is cut off; at the moment of the charger being connected, the output voltage of the charger is higher than that of the lithium battery pack, namely, the voltage between CHG + and CHG-is higher than that between BAT + and BAT-, and because CHG + and BAT + are connected, the voltage of BAT-is higher than that of CHG-, the grid voltage of the N-MOSFET Q3 is higher than that of the source voltage thereof, and the N-MOSFET Q3 is turned on.
The second electronic switch comprises a P-MOSFET Q2, a resistor R4 and a voltage stabilizing diode Z1, the source electrode of the P-MOSFET Q2 is connected with the negative electrode of the voltage stabilizing diode Z1 and then used for being connected with a power supply, the drain electrode of the P-MOSFET Q2 is connected with the input end of a voltage stabilizing circuit, the grid electrode of the P-MOSFET Q2 is connected with the input end of the first electronic switch, and the resistor R4 is connected with the two ends of the voltage stabilizing diode Z1 in parallel.
When the N-MOSFET Q3 is turned off, the gate voltage of the P-MOSFET Q2 is equal to the source voltage thereof, resulting in the P-MOSFET Q2 also being in the off state, and the output voltage is zero; when the N-MOSFET Q3 is turned on, the gate voltage of the P-MOSFET Q2 is pulled low, so that the gate voltage of the P-MOSFET Q2 is smaller than the source voltage thereof, the P-MOSFET Q2 is turned on, and the drain of the P-MOSFET Q2 outputs a voltage to the voltage regulator circuit. A reverse protection diode D2 is also connected in series between the gate of the P-MOSFET tube Q2 and the drain of the N-MOSFET tube Q3.
The voltage stabilizing circuit comprises a clamping circuit, a capacitor C1 and a voltage stabilizing diode Z2, wherein the input end of the clamping circuit is connected with one end of a capacitor C1 and the negative electrode of a voltage stabilizing diode Z2, the output end of the clamping circuit and the positive electrode of the voltage stabilizing diode Z2 are grounded, and the other end of the capacitor C1 is used for being connected with the input end of a battery management system.
The clamping circuit comprises a plurality of diodes connected in series, specifically, 5 diodes, and each diode has a voltage drop of about 0.4-0.5V, so that the clamping voltage is stabilized at about 2-2.5V. When the clamping voltage is changed from 0V to 2-2.5V, the capacitor C1 is charged at the same time, the voltage at the input end of the battery management system reaches the same value as the clamping voltage instantly, and then the electric energy stored in the capacitor C1 is released through the input end TS1 of the battery management system, so that the effect of generating pulse voltage is achieved, and the pulse voltage is used for awakening the battery management system. The zener diode Z2 is mainly used to prevent the clamping voltage from being too high, and plays a role in protection.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. The utility model provides a lithium battery management system's awakening circuit, its characterized in that includes first electronic switch, second electronic switch and voltage stabilizing circuit, first electronic switch's drive end is used for connecting the negative pole of lithium cell group, first electronic switch's output is used for connecting the charger negative pole, second electronic switch's drive end is connected to first electronic switch's input, second electronic switch's input is used for connecting the power, second electronic switch's output is connected with the voltage stabilizing circuit input, voltage stabilizing circuit's output is used for connecting battery management system's input.
2. The wake-up circuit of a lithium battery management system as claimed in claim 1, wherein the first electronic switch comprises an N-MOSFET Q3, a zener diode Z3, a resistor R6 and a resistor R7, the source of the N-MOSFET Q3 is connected to one end of a resistor R7 and the anode of a zener diode Z3, the other end of the resistor R7 is connected to the negative electrode of the charger, the gate of the N-MOSFET Q3 is connected to one end of a resistor R6 and the cathode of the zener diode Z3, the other end of the resistor R6 is connected to the negative electrode of the lithium battery pack, and the drain of the N-MOSFET Q3 is connected to the driving end of the second electronic switch.
3. The wake-up circuit of a lithium battery management system as claimed in claim 2, wherein the resistor R7 is further connected in series with a reverse protection diode D3.
4. The wake-up circuit of the lithium battery management system as claimed in claim 1, wherein the second electronic switch comprises a P-MOSFET Q2, a resistor R4 and a zener diode Z1, the source of the P-MOSFET Q2 is connected to the cathode of the zener diode Z1 for connecting to a power supply, the drain of the P-MOSFET Q2 is connected to the input end of the voltage regulator circuit, the gate of the P-MOSFET Q2 is connected to the input end of the first electronic switch, and the resistor R4 is connected in parallel to two ends of the zener diode Z1.
5. The wake-up circuit of the lithium battery management system as claimed in claim 1, wherein the voltage stabilizing circuit comprises a clamp circuit, a capacitor C1 and a zener diode Z2, the input terminal of the clamp circuit is connected to one terminal of the capacitor C1 and the cathode of the zener diode Z2, the output terminal of the clamp circuit and the anode of the zener diode Z2 are grounded, and the other terminal of the capacitor C1 is used for connecting to the input terminal of the battery management system.
6. The wake-up circuit for a lithium battery management system as claimed in claim 5, wherein the clamping circuit comprises a plurality of diodes connected in series.
7. The wake-up circuit of a lithium battery management system as claimed in claim 1, wherein a reverse protection diode D2 is further connected in series between the first electronic switch and the second electronic switch.
8. The wake-up circuit of a lithium battery management system as claimed in claim 1, further comprising a power access circuit, wherein the power access circuit comprises a diode D1, a resistor R1, a resistor R2, a resistor R3 and an N-MOSFET Q1, the drain of the N-MOSFET Q1 is connected in series with the resistor RI and then connected with the cathode of the diode D1, the anode of the diode D1 is connected with the anode of the lithium battery pack, the gate of the N-MOSFET Q1 is connected in series with the resistor R3 and then connected with the anode of the lithium battery cell, and the source of the N-MOSFET Q1 is connected in series with the resistor R2 and then connected with the input terminal of the second electronic switch.
CN201922236943.5U 2019-12-13 2019-12-13 Wake-up circuit of lithium battery management system Active CN210927172U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922236943.5U CN210927172U (en) 2019-12-13 2019-12-13 Wake-up circuit of lithium battery management system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922236943.5U CN210927172U (en) 2019-12-13 2019-12-13 Wake-up circuit of lithium battery management system

Publications (1)

Publication Number Publication Date
CN210927172U true CN210927172U (en) 2020-07-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN210927172U (en)

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