CN211377650U

CN211377650U - Control protection module of master-slave motor

Info

Publication number: CN211377650U
Application number: CN202020219703.4U
Authority: CN
Inventors: 严盼盼; 李杰栋; 张强根; 田凯; 滕跃; 刘滕航
Original assignee: Suzhou Jieyuefei Electronic Technology Co ltd
Current assignee: Suzhou Jieyuefei Electronic Technology Co ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-08-28
Anticipated expiration: 2030-02-27

Abstract

The application relates to a control protection module of a master-slave motor, which comprises a single chip microcomputer U1, a 6-section lithium battery protection IC chip U2, a charging MOS switch circuit, a master discharging MOS switch circuit, a slave discharging MOS switch circuit and a lithium battery pack voltage sampling circuit; a charging protection pin CO and a discharging protection pin DO of the lithium battery protection IC chip U2 are respectively connected with the single chip microcomputer U1; the single chip microcomputer U1 is in driving connection with the charging MOS switch circuit and the master/slave discharging MOS switch circuit to realize the overcharge/overdischarge protection of the lithium battery pack; the lithium battery pack voltage sampling circuit comprises voltage sampling resistors R26 and R27 which are connected in series, and the single chip microcomputer U1 is used for triggering the charging MOS switch circuit or the main discharging MOS switch circuit and the auxiliary discharging MOS switch circuit to act according to the charging and discharging voltage of the lithium battery pack, which is acquired by the lithium battery pack voltage sampling circuit, under the condition of the U2 fault.

Description

Control protection module of master-slave motor

Technical Field

The application belongs to the technical field of batteries, particularly relates to protection of lithium batteries, and particularly relates to a control protection module of a master-slave motor.

Background

Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. Because the chemical characteristics of lithium metal are very active, the lithium metal has very high requirements on the environment in processing, storage and use, and therefore, the lithium battery is not applied for a long time. In recent years, more and more products such as PDAs, digital cameras, mobile phones, portable audio devices, bluetooth devices, and the like, adopt lithium batteries as main power sources, and now, lithium batteries have become the mainstream.

Since the electronic battery has a high energy density, safety during charging and discharging must be considered to prevent deterioration of characteristics. In the daily charging and discharging process of the lithium battery, the situations of overcharge and overdischarge are easy to occur. Overcharge and overdischarge many times can cause permanent damage to the lithium cell, shortens the life of lithium cell, still continues to use after the lithium cell damages, leads to the lithium cell to explode easily, endangers user's life safety even.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the problem of explosion caused by overcharge and overdischarge of lithium batteries in the prior art is solved, and a control protection module of a master motor and a slave motor is provided.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a control protection module of a master-slave motor, which comprises a singlechip U1, a 6-section lithium battery protection IC chip U2, a charging MOS switch circuit, a master discharging MOS switch circuit, a slave discharging MOS switch circuit and a lithium battery pack voltage sampling circuit;

the charging MOS switch circuit is connected in series in a charging loop of the lithium battery, the main MOS switch circuit is connected in series in a power supply loop of the main motor, and the slave MOS switch circuit is connected in series in a power supply loop of the slave motor;

a voltage detection port of the lithium battery protection IC chip U2 is connected with a lithium battery pack, and a charging protection pin CO and a discharging protection pin DO of the lithium battery protection IC chip U2 are respectively connected with an I/O port corresponding to the single chip microcomputer U1;

the single chip microcomputer U1 is in driving connection with the charging MOS switch circuit, the main discharging MOS switch circuit and the auxiliary discharging MOS switch circuit and is used for controlling the charging MOS switch circuit or the main discharging MOS switch circuit and the auxiliary discharging MOS switch circuit to be switched off according to an overcharge or overdischarge signal output by the lithium battery protection IC chip U2 so as to realize overcharge/overdischarge protection of the lithium battery pack;

the lithium battery pack voltage sampling circuit comprises voltage sampling resistors R12 and R13 which are connected in series, one end of the voltage sampling resistor R13 is connected with the R12 in series and then connected to a VCC power supply, the other end of the voltage sampling resistor R13 is connected with the negative electrode end of a charging port, and the series point of the voltage sampling resistor R12 and the R13 is connected to a voltage detection input port of a single-chip microcomputer U1; the single chip microcomputer U1 is used for triggering the connection or disconnection of the charging MOS switch circuit or the main discharging MOS switch circuit and the auxiliary discharging MOS switch circuit according to the total charging and discharging voltage of the lithium battery pack, which is acquired by the lithium battery pack voltage sampling circuit, under the condition of the U2 fault.

Further, according to the control protection module of master-slave motor, the MOS switch circuit that charges include P channel MOS pipe Q5, NPN triode Q7, resistance R25 and diode D5 who takes anti-parallel diode, singlechip U1's overcharge control signal output part is connected through series resistance R25 to NPN triode Q7's projecting pole, resistance R28 ground connection is passed through to NPN triode Q7's base level, NPN triode Q7's collecting electrode and P channel MOS pipe Q5's grid are connected, the negative pole end of charging port is connected to P channel MOS pipe Q5's source electrode, P channel MOS pipe Q5's drain electrode and lithium cell access port's negative pole end are connected, P channel MOS pipe Q5's source electrode is connected to diode D5's positive pole, the negative pole of diode D5 is connected the negative pole end of charging port.

Further, according to the utility model discloses a control protection module of master slave motor, main discharge MOS switch circuit is including taking the first N channel MOS pipe QM1 of anti-parallel diode, the grid of first N channel MOS pipe QM1 passes through resistance R35 and connects singlechip U1's an I/O port, first N channel MOS pipe QM 1's drain electrode is connected with the negative pole end of main motor access, first N channel MOS pipe QM 1's source electrode is connected with the negative pole end of lithium cell access, and first N links up between MOS pipe QM 1's source electrode and the drain electrode and has parallelly connected electric capacity C18.

Further, according to control protection module of principal and subordinate motor, from the second N channel MOS pipe QS1 that discharges MOS switch circuit including taking anti-parallel diode, the grid of first N channel MOS pipe QS1 passes through resistance R37 and connects a I/O port of singlechip U1, second N channel MOS pipe QS 1's drain electrode is connected with the negative pole end from the motor access mouth, second N channel MOS pipe QS 1's source and lithium cell access mouth's negative pole end are connected, just second N links up between MOS pipe QS 1's source electrode and the drain electrode and has parallelly connected electric capacity C19.

Further, according to control protection module of principal and subordinate motor, still include charge-discharge high temperature detection circuitry, charge-discharge high temperature detection circuitry includes thermistor NTC and divider resistance R18, divider resistance R18's a termination 5V power, the other end concatenates back ground connection with the NTC, thermistor NTC and divider resistance R18's series connection point is connected to singlechip U1's temperature detection signal input.

Further, according to the utility model discloses a control protection module of master slaver motor, still include the short circuit detection unit, the short circuit detection unit includes voltage comparator LM393, the 2 nd pin of reverse input of voltage comparator LM393 passes through voltage sampling resistance R42 and connects the source electrode of first N channel MOS pipe QM1, the 6 th pin of reverse input of voltage comparator LM393 passes through voltage sampling resistance R51 and connects the source electrode of second N channel MOS pipe QS 1; the 1 st pin and the 5 th pin of the positive input of the voltage comparator LM393 are connected with a reference voltage circuit; and two output ends of the voltage comparator LM393 are connected with a short-circuit detection signal input end of the singlechip U1.

Further, according to the control protection module of principal and subordinate motor, still include and overflow the detecting element, overflow the detecting element and include main voltage sampling resistance R45 and follow voltage sampling resistance R52, main voltage sampling resistance R45's one end inserts main motor supply circuit, singlechip U1's IO port is connected to voltage sampling resistance R45's the other end, from voltage sampling resistance R52's one end access slave circuit return circuit, singlechip U1's IO port is connected to voltage sampling resistance R52's the other end.

Further, according to the control protection module of principal and subordinate motor, still include charge and discharge signal pilot lamp, charge and discharge signal pilot lamp includes a set of LED lamp, a set of LED lamp connect at singlechip U1's IO port for according to the charge/discharge SOC state of lithium cell group, light on/extinguish in proper order.

Further, according to the utility model discloses a control protection module of principal and subordinate motor, still include power module, power module includes three terminal regulator U4, takes anti-parallel diode's P channel MOS pipe Q1, first power supply trigger circuit and second power supply trigger circuit, 5V device operating voltage is exported to the output of three terminal regulator U4; the source electrode of the P-channel MOS tube Q1 is connected with the positive electrode end M + of the main motor access port, and the drain electrode of the P-channel MOS tube Q1 and an external power supply VCC are connected with the input end of a three-terminal voltage regulator U4 through a diode D1 in forward connection;

the first power supply trigger circuit comprises an NPN triode Q2, the grid electrode of the P-channel MOS transistor Q1 is connected with the collector electrode of an NPN triode Q2, the base stage of the NPN triode Q2 is connected with the driving control signal output end of a main controller U1, and the emitter electrode of the NPN triode Q2 is grounded;

the second power supply trigger circuit comprises a resistor R30 and a diode D3, one end of the resistor R30 is connected with the grid electrode of the Q1, and the other end of the resistor 30 is connected with the negative electrode end CH-of the charging access port through a diode D3 connected in the forward direction.

Further, according to the control protection module of principal and subordinate motor, including main motor power regulating circuit, main motor power regulating circuit includes series connection's voltage sampling resistance R1, R2 and gear regulating switch SW2, resistance R1's one end and resistance R2 establish ties the back ground connection, resistance R2's the other end passes through gear regulating switch SW2 and connects the positive terminal M + of main motor access mouth, resistance R1 and resistance R2's series connection point inserts singlechip U1's I/O port, singlechip U1 output PWM signal drive connects main motor, resistance R2 and gear regulating switch's series connection point inserts three-terminal regulator U4's input through the diode D4 of forward connection.

The utility model has the advantages that: the utility model discloses a control protection module of principal and subordinate motor can carry out charge-discharge protection to the lithium cell, avoids the overcharge of lithium cell, cross putting, prolongs the life of lithium cell. At the same time, overcurrent protection and short-circuit protection are added

Drawings

The technical solution of the present application is further explained below with reference to the drawings and the embodiments.

Fig. 1 is a block diagram of a control protection module of a master-slave motor according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a control protection module of a master-slave motor according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

The embodiment provides a control protection module for a master-slave motor, as shown in fig. 1, which includes two lithium battery access ports B + and B-for connecting lithium batteries, a charging access port CH + and CH-for accessing a charger, a master motor access port M + and M-for accessing a master motor, a slave motor access port S + and S-for accessing a slave motor, a single chip microcomputer U1, and 6 lithium battery protection IC chips U2, a charging MOS switch circuit, a master discharging MOS switch circuit, a slave discharging MOS switch circuit, and a lithium battery pack voltage sampling circuit.

The charging MOS switch circuit is connected in series in a charging loop of the lithium battery, the main discharging MOS switch circuit is connected in series in a main motor power supply loop, and the auxiliary discharging MOS switch circuit is connected in series in an auxiliary motor power supply loop.

The voltage detection port of the lithium battery protection IC chip U2 is connected with the B + end and the B-end of the lithium battery pack and is used for detecting the charging and discharging voltage of the lithium battery pack in the charging and discharging processes of the lithium battery; and a charging protection pin and a discharging protection pin of the lithium battery protection IC chip U2 are connected with the single chip microcomputer U1 and used for sending an overcharge or overdischarge signal to the single chip microcomputer U1 when detecting that the lithium battery pack is overcharged or overdischarged.

The single chip microcomputer U1 is connected with the control end of the charging MOS switch circuit and used for controlling the disconnection of the charging MOS switch circuit when receiving an overcharge signal of the lithium battery protection IC chip, so that overcharge protection is realized.

The single chip microcomputer U1 is connected with the control ends of the main discharge MOS switch circuit and the slave discharge MOS switch circuit and is used for controlling the disconnection of the main discharge MOS switch circuit and the slave discharge MOS switch circuit when receiving an over-discharge signal of the lithium battery protection IC chip U2, so that over-discharge protection is realized.

The embodiment also provides a lithium battery pack voltage sampling circuit, under the condition of the fault of U2, the single chip microcomputer U1 acquires the total charging and discharging voltage of the lithium battery pack through the lithium battery pack voltage sampling circuit, and when the lithium battery pack is overcharged or overdischarged, the charging MOS switch circuit or the main discharging MOS switch circuit is triggered, and the slave discharging MOS switch circuit is switched off.

The lithium battery pack for the motor is formed by connecting six lithium batteries in series, and the voltage of a single lithium battery is 4.25V.

As shown in fig. 2, the charging MOS switch circuit includes a P-channel MOS transistor Q5 with an anti-parallel diode, an NPN transistor Q7, a resistor R25, and a diode D5. The main discharge MOS switch circuit comprises a first N-channel MOS tube QM1 with an anti-parallel diode, a resistor R35 and a capacitor C18; the slave discharge MOS switch circuit includes a second N communication MOS transistor QS1 with an anti-parallel diode, a resistor R37 and a capacitor C19. The lithium battery pack voltage sampling circuit comprises voltage sampling resistors R12 and R13 which are connected in series, and a capacitor C1.

The B + end is connected with the CH + end, an emitter of an NPN triode Q7 is connected with the 16 th pin of U1 through a series resistor R25, a base of the NPN triode Q7 is grounded through a resistor R28, a collector of the NPN triode Q7 is connected with a grid of a P-channel MOS tube Q5, a source of the P-channel MOS tube Q5 is connected with an anode of a diode D5, a cathode of the diode D5 is connected with the CH-end, and a drain of the P-channel MOS tube Q5 is connected with the B-end.

The B + end is connected with the M + end, the grid electrode of a first N-channel MOS tube QM1 is connected with the 19 th pin of the singlechip U1 through a resistor R35, the drain electrode of the first N-channel MOS tube QM1 is connected with the M-end, the source electrode of the first N-channel MOS tube QM1 is connected with the B-end, a diode D6 is connected between the M + end and the M-end, the anode of the D6 is connected with the M-end, the cathode of the D6 is connected with the M + end, and a capacitor C18 is connected between the source electrode and the drain electrode of the first N communication MOS tube QM1 in parallel.

The B + end is connected with the S + end, the grid electrode of a second N-channel MOS tube QS1 is connected with the 18 th pin of the single-chip microcomputer U1 through a resistor R37, the drain electrode of the second N-channel MOS tube QS1 is connected with the S-end, the source electrode of the second N-channel MOS tube QS1 is connected with the B-end, a diode D7 is arranged between the S + end and the S-end, the anode of the D7 is connected with the S-end, the cathode of the D7 is connected with the S + end, and a capacitor C19 is connected between the source electrode and the drain electrode of the second N communication MOS tube QS1 in parallel.

The detection voltages of six lithium batteries B1, B2, B3, B4, B5 and B6 are respectively input to six voltage detection ports (VC1, VC2, VC3, VC4, VC5 and VC 6) of U2 through respective corresponding voltage sampling circuits, the CO end of U2 is connected with the 9 th pin of the singlechip U1, and the DO end is connected with the 10 th pin of the singlechip U1.

The utility model discloses a control protection module during operation of principal and subordinate' S motor, insert between B + end and the B-end respectively with the both ends of lithium cell group, the charger inserts CH + end and CH-end, and main motor inserts M + end and M-end, inserts S + end and S-end from the motor.

When the lithium battery protection IC chip works normally, the CO end and the DO end of the lithium battery protection IC chip U2 both output high levels, the 9 th pin of the U1 outputs low levels, and the NPN triode Q7 and the P-channel MOS transistor Q5 are conducted; the 18 th pin and the 19 th pin both output high levels, the first N-channel MOS tube QM1 and the second N-channel MOS tube QS1 are both turned on, at the moment, the lithium battery can be freely charged and discharged, current is input into the lithium battery from the B + end and the B-end during charging, and the current of the lithium battery is output to the main motor through the M + end and the M-end and is input into the slave motor through the S + end and the S-end during discharging.

In the lithium battery charging process, if the lithium battery protection IC chip U2 detects that the voltage of any one of the lithium batteries or the total voltage of the lithium battery pack exceeds a preset overcharge protection voltage value, the output of the CO end is converted from a high level to a low level, at the moment, the 9 th pin of U1 is considered to be full of the lithium battery pack according to a received low level signal, the output of the 16 th pin of U1 is converted from the low level to the high level, the NPN triode Q7 is cut off, and therefore the P-channel MOS tube Q5 is turned off, the charger stops charging the lithium batteries, and overcharge protection of the lithium batteries is achieved.

When the lithium battery is continuously discharged, if the lithium battery protection IC chip U2 detects that the voltage of any one of the lithium batteries or the total voltage of the lithium battery pack is lower than a preset over-discharge protection voltage threshold, the output of a DO end is converted from a high level to a low level, at the moment, the 10 th pin of the U1 considers that the discharge of the lithium battery pack is completed according to a received low level signal, the outputs of the 19 th pin and the 18 th pin of the U1 are converted from the high level to the low level, the first N-channel MOS tube QM1 and the second N communication MOS tube QS1 are turned off, the power supply loops of the main motor and the slave motor are turned off, the work of the main motor and the slave motor is stopped, and the over-discharge.

This embodiment has still set up lithium cell group voltage sampling circuit, including series connection's voltage sampling resistance R12, R13 and electric capacity C1, the VCC power is inserted to voltage sampling resistance R13's one end and R12 after establishing ties, voltage sampling resistance R13's the other end is connected with the negative pole end of charging port, voltage sampling resistance R12 and R13's series connection point inserts singlechip U1's 12 th pin, and electric capacity C1 connects in parallel at the both ends of resistance R13. The single chip microcomputer U1 is used for triggering the connection or disconnection of the charging MOS switch circuit or the main discharging MOS switch circuit and the auxiliary discharging MOS switch circuit according to the total charging and discharging voltage of the lithium battery pack, which is acquired by the lithium battery pack voltage sampling circuit, under the condition of the U2 fault.

Furthermore, the present embodiment is provided with a charge and discharge signal indicator light, the charge and discharge signal indicator light comprises a group of LED lights, namely LD1, LD2, LD3 and LD4, an anode of the LD1 is connected to the 5 th pin of the U1 of the single chip microcomputer through a resistor R3, and a cathode of the LD1 is connected to the 8 th pin of the U1 through a resistor R5; the anode of the LD2 is connected to the 6 th pin of the singlechip U1 through a resistor R4, and the cathode of the LD2 is connected to the 8 th pin of the singlechip U1 through a resistor R5; the anode of the LD3 is connected with the 5 th pin of the singlechip U1 through a resistor R3, and the cathode of the LD3 is connected with the 6 th pin of the singlechip U1 through a resistor 4; the anode of LD4 passes through resistance R4 and connects in singlechip U1's 6 th pin, and the cathode of LD4 passes through resistance R3 and connects in singlechip U1's 5 th pin, and LD1, LD2, LD3 and LD4 access connector J2. In the charging process of the lithium battery pack, the single chip microcomputer U1 sequentially lights the LD1, the LD2, the LD3 and the LD4 according to the SOC state of the lithium battery pack; in the discharging process of the lithium battery pack, the single chip microcomputer U1 extinguishes the LD4, the LD3, the LD2 and the LD1 in sequence according to the SOC state of the lithium battery pack.

The power supply module is used for providing a stable 5V voltage source for each device, and comprises a three-terminal regulator U4, a P-channel MOS tube Q1 with an anti-parallel diode, a first power supply trigger circuit and a second power supply trigger circuit, wherein the output end of the three-terminal regulator U4 outputs a 5V device working voltage; the source electrode of the P-channel MOS tube Q1 is connected with the positive electrode end M + of the main motor access port, and the drain electrode of the P-channel MOS tube Q1 and an external power supply VCC are connected with the input end of a three-terminal voltage regulator U4 through a diode D1 in forward connection; and a resistor R9 is connected between the grid and the source of the P-channel MOS transistor Q1 for protection.

The first power supply trigger circuit comprises an NPN triode Q2, the grid electrode of the P-channel MOS transistor Q1 is connected with the collector electrode of an NPN triode Q2, the base level of the NPN triode Q2 is connected with a pin 2 of a main controller U1, and the emitter electrode of the NPN triode Q2 is grounded; when the U1 detects that the charger is connected, the NPN triode is triggered to conduct the Q2, so that the P-channel MOS transistor Q1 is triggered to conduct, and the power supply module starts to work.

The second power supply trigger circuit comprises a resistor R30 and a diode D3, one end of the resistor R30 is connected with the grid electrode of the Q1, and the other end of the resistor 30 is connected with the negative electrode end CH-of the charging access port through a diode D3 connected in the forward direction. When the charger is connected, the charging loop of the battery pack is connected, the diode D2 is conducted, the Q1 is triggered to be conducted, and the power supply module starts to work. Under the condition that an NPN triode Q2 has a fault, the normal work of a power supply module can be ensured through a power supply trigger circuit.

In the working process of the power supply circuit of the embodiment, the voltage at the input end of the three-terminal regulator U4 can select the power supply voltage of the lithium battery pack, and can also select the power supply voltage provided by the external VCC power supply.

The embodiment further comprises a main motor power adjusting circuit, the main motor power adjusting circuit comprises voltage sampling resistors R1 and R2 which are connected in series and a gear adjusting switch SW2, one end of the resistor R1 is connected with the resistor R2 in series and then is grounded, the other end of the resistor R2 is connected with a positive electrode end M + of a main motor access port through the gear adjusting switch SW2, the serial point of the resistor R1 and the resistor R2 is connected with an I/O port of the single chip microcomputer U1, the single chip microcomputer U1 outputs a PWM signal to drive and connect the main motor, and the serial point of the resistor R2 and the gear adjusting switch is connected with an input end of a three-terminal regulator U4 through a diode D4 which is connected in the forward direction.

As a further implementation manner, the present embodiment further provides a charge and discharge detection circuit, which includes a resistor R26, a resistor R27, and a diode D2, wherein one end of the resistor R26 is connected to the 5V power supply, the other end of the resistor R26 is connected to the anode of the diode D2 through a series resistor R27, the cathode of the diode D2 is connected to the charge port CH-, the series point of the resistor R26 and the resistor R27 is connected to the 4 th pin of the single chip U1, when the charger is connected to the charge port (CH +, CH-), the charge and discharge detection circuit is turned on, and the single chip U1 determines whether the battery pack is in a normal charge and discharge process according to the detected voltage signal, so as to control the operation of the power supply circuit.

Example 2:

in this embodiment, an overcurrent detection unit, a short-circuit detection unit, and a charge/discharge high-temperature detection circuit are further provided on the basis of embodiment 1.

The overcurrent detection unit comprises a main voltage sampling resistor R45 and a slave voltage sampling resistor R52, one end of the main voltage sampling resistor R45 is connected to a main motor power supply loop, the other end of the voltage sampling resistor R45 is connected with a 14 pin of a single chip microcomputer U1, one end of the slave voltage sampling resistor R52 is connected to a slave circuit loop, and the other end of the slave voltage sampling resistor R52 is connected with a 13 pin of the single chip microcomputer U1. When the loop current of the lithium battery pack is overlarge, the high potential is detected by the R45 and the R52 and fed back to the U1, and the U1 drives the QM1 and the QS1 to be cut off, so that overcurrent protection is realized.

The short circuit detection circuit comprises a voltage comparator LM393, the voltage comparator LM393 comprises a comparator U5A and a comparator U5B, the 2 nd reverse input pin of the voltage comparator LM393 is connected with the source electrode of a first N-channel MOS tube QM1 through a voltage sampling resistor R42, the 6 th reverse input pin of the voltage comparator LM393 is connected with the source electrode of a second N-channel MOS tube QS1 through a voltage sampling resistor R51, the 3 rd forward input pin and the 5 th forward input pin of the voltage comparator LM393 are connected with a reference voltage circuit, and two output ends of the voltage comparator LM393 are connected with 17 pins of a single chip microcomputer U1.

When the main motor is short-circuited, a large current is instantaneously generated at the source of the QM1, the 2 nd pin of the U5 detects a high potential, so that the 1 st pin outputs a high level signal, and the 17 th pin of the U1 immediately turns off the QM1 after detecting the high level signal, so that short-circuit protection is realized. When the slave motor is short-circuited, the 6 th pin of the U5 detects high potential, and QS1 is turned off, so that short-circuit protection is realized.

The reference voltage circuit comprises a first reference voltage circuit and a second reference voltage circuit, wherein the first reference voltage circuit comprises a resistor R43 and a resistor R50 which are connected in series, and the series point of the resistor R43 and the resistor R50 is connected to the 3 rd pin of the positive input of the voltage comparator LM 393; the second reference voltage circuit includes

The charge-discharge high-temperature detection circuit comprises a thermistor NTC, a divider resistor R18 and a capacitor C12, wherein the capacitor C12 is connected to two ends of the thermistor NTC in parallel, one end of the divider resistor R18 is connected with a 5V power supply, and the other end of the divider resistor R18 is connected with the NTC in series and then is grounded. And the serial point of the thermistor NTC and the divider resistor R12 is connected to the 11 th pin of the singlechip U1.

When the surface temperature of the lithium battery reaches about 55-70 degrees in the charging or discharging process of the lithium battery, the resistance value of the thermistor NTC is reduced, the series current flowing through the NTC and the R12 is increased, the voltage at two ends of the R12 is increased, and the potential of the series point of the NTC and the R12 is increased. When the high potential is detected by the 11 th pin of U1, Q5, QM1 and QS1 are immediately turned off, and a charge-discharge high-temperature protection function is realized.

Example 3

The embodiment provides a master-slave motor control circuit, which comprises a master motor power regulating circuit and a master-slave motor control protection module in embodiment 2. The control protection module of the master-slave motor is the same as that of the embodiment 1 and the embodiment 2, and the description is omitted.

The power regulating circuit of the main motor comprises voltage sampling resistors R1 and R2 which are connected in series and a starting switch SW2, one end of the resistor R1 is grounded after being connected with the resistor R2 in series, the other end of the resistor R2 is connected with the positive pole end M + of the access port of the main motor, the 3 rd pin of the single chip microcomputer U1 is connected with the series point of the resistor R1 and the resistor R2, and the single chip microcomputer U1 outputs a PWM signal to drive and connect the main motor. One end of the starting switch SW2 is connected with the resistor R1, and the other end is connected with the positive electrode end M + of the main motor access port.

When the starting switch SW2 is pressed, the 3 rd pin of U1 detects the current running power of the main motor, outputs a PWM signal to adjust the power of the main motor according to the current running power of the main motor and the set target speed, so that the actual running speed of the main motor reaches the set target speed.

The utility model discloses an improve lithium cell charge-discharge security, adopt the overcharge usually, cross discharge, overflow, the short circuit charges, discharges, protection such as excess temperature has prevented the potential safety hazard effectively.

When the battery pack is connected with the charger for charging, the total voltage of the lithium battery pack, the overcharge voltage of a single lithium battery and the temperature of the battery are detected, any value reaches a set threshold value, the BMS protection system can turn off a charging loop, and the load cannot work during charging.

When the load works, the total voltage of the battery pack, the over-discharge voltage of a single lithium battery and the temperature of the lithium battery are detected, any value reaches a set threshold value, and the BMS protection system can shut off a discharge loop. If the single lithium battery is overdischarged, the load can recover the normal operation after the single lithium battery is charged.

In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. A control protection module of master slaver motor which characterized in that: the charging circuit comprises a single chip microcomputer U1, a 6-section lithium battery protection IC chip U2, a charging MOS switch circuit, a main discharging MOS switch circuit, a slave discharging MOS switch circuit and a lithium battery pack voltage sampling circuit;

the charging MOS switch circuit is connected in series in a charging loop of the lithium battery, the main discharging MOS switch circuit is connected in series in a main motor power supply loop, and the slave discharging MOS switch circuit is connected in series in a slave motor power supply loop;

2. The control protection module of a master-slave motor as claimed in claim 1, wherein the charging MOS switch circuit comprises a P-channel MOS transistor Q5 with an anti-parallel diode, an NPN triode Q7, a resistor R25 and a diode D5, wherein an emitter of the NPN triode Q7 is connected to the overcharge control signal output terminal of the single-chip microcomputer U1 through a series resistor R25, a base of the NPN triode Q7 is grounded through a resistor R28, a collector of the NPN triode Q7 is connected to a gate of the P-channel MOS transistor Q5, a source of the P-channel MOS transistor Q5 is connected to the negative terminal of the charging port, a drain of the P-channel MOS transistor Q5 is connected to the negative terminal of the lithium battery inlet, an anode of the diode D5 is connected to the source of the P-channel MOS transistor Q5, and a cathode of the diode D5 is connected to the negative terminal of the charging port.

3. The control protection module for a master-slave motor according to claim 1, wherein the main discharging MOS switch circuit comprises a first N-channel MOS transistor QM1 with an anti-parallel diode, the gate of the first N-channel MOS transistor QM1 is connected to one I/O port of the single-chip microcomputer U1 through a resistor R35, the drain of the first N-channel MOS transistor QM1 is connected to the negative terminal of the main motor inlet, the source of the first N-channel MOS transistor QM1 is connected to the negative terminal of the lithium battery inlet, and a capacitor C18 is connected in parallel between the source and the drain of the first N-channel MOS transistor QM 1.

4. The control protection module of a master-slave motor as claimed in claim 3, wherein said slave discharging MOS switch circuit comprises a second N-channel MOS tube QS1 with anti-parallel diode, the gate of said second N-channel MOS tube QS1 is connected to an I/O port of a single-chip microcomputer U1 through a resistor R37, the drain of said second N-channel MOS tube QS1 is connected to the negative terminal of the slave motor inlet, the source of said second N-channel MOS tube QS1 is connected to the negative terminal of the lithium battery inlet, and a capacitor C19 is connected in parallel between the source and the drain of said second N communication MOS tube QS 1.

5. The control protection module of a master-slave motor as claimed in claim 1, further comprising a charge-discharge high temperature detection circuit, wherein the charge-discharge high temperature detection circuit comprises a thermistor NTC and a voltage dividing resistor R18, one end of the voltage dividing resistor R18 is connected to a 5V power supply, the other end of the voltage dividing resistor R18 is connected in series with the NTC and then grounded, and the series point of the NTC and the voltage dividing resistor R18 is connected to the temperature detection signal input end of the single chip microcomputer U1.

6. The control protection module of the master-slave motor as claimed in claim 4, further comprising a short circuit detection unit, wherein the short circuit detection unit comprises a voltage comparator LM393, the 2 nd pin of the inverting input of the voltage comparator LM393 is connected with the source of the first N-channel MOS transistor QM1 through a voltage sampling resistor R42, and the 6 th pin of the inverting input of the voltage comparator LM393 is connected with the source of the second N-channel MOS transistor QS1 through a voltage sampling resistor R51; the 1 st pin and the 5 th pin of the positive input of the voltage comparator LM393 are connected with a reference voltage circuit; and two output ends of the voltage comparator LM393 are connected with a short-circuit detection signal input end of the singlechip U1.

7. The control protection module of the master-slave motor as claimed in claim 1, further comprising an overcurrent detection unit, wherein the overcurrent detection unit comprises a master voltage sampling resistor R45 and a slave voltage sampling resistor R52, one end of the master voltage sampling resistor R45 is connected to the power supply loop of the master motor, the other end of the voltage sampling resistor R45 is connected to the I/O port of the singlechip U1, one end of the slave voltage sampling resistor R52 is connected to the slave circuit loop, and the other end of the slave voltage sampling resistor R52 is connected to the I/O port of the singlechip U1.

8. The control protection module of a master-slave motor as claimed in claim 1, further comprising a charge and discharge signal indicator lamp, wherein the charge and discharge signal indicator lamp comprises a set of LED lamps, and the set of LED lamps are connected to the I/O port of the single chip microcomputer U1 and are used for being sequentially turned on/off according to the charge/discharge SOC state of the lithium battery pack.

9. The control protection module of a master-slave motor according to any one of claims 1-8, further comprising a power supply module, wherein the power supply module comprises a three-terminal regulator U4, a P-channel MOS tube Q1 with an anti-parallel diode, a first power supply trigger circuit and a second power supply trigger circuit, and the output end of the three-terminal regulator U4 outputs 5V device working voltage; the source electrode of the P-channel MOS tube Q1 is connected with the positive electrode end M + of the main motor access port, and the drain electrode of the P-channel MOS tube Q1 and an external power supply VCC are connected with the input end of a three-terminal voltage regulator U4 through a diode D1 in forward connection;

10. The control protection module of the master-slave motor as claimed in claim 9, comprising a master motor power adjusting circuit, wherein the master motor power adjusting circuit comprises voltage sampling resistors R1 and R2 and a gear adjusting switch SW2 which are connected in series, one end of the resistor R1 is connected with the resistor R2 in series and then grounded, the other end of the resistor R2 is connected with the positive terminal M + of the master motor access port through the gear adjusting switch SW2, the series point of the resistor R1 and the resistor R2 is connected with the I/O port of the single chip microcomputer U1, the single chip microcomputer U1 outputs a PWM signal to drive and connect the master motor, and the series point of the resistor R2 and the gear adjusting switch is connected with the input end of a three-terminal regulator U4 through a diode D4 which is connected in the forward direction.