CN106786928B - BMS charge-discharge control protection circuit - Google Patents
BMS charge-discharge control protection circuit Download PDFInfo
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- CN106786928B CN106786928B CN201611251300.2A CN201611251300A CN106786928B CN 106786928 B CN106786928 B CN 106786928B CN 201611251300 A CN201611251300 A CN 201611251300A CN 106786928 B CN106786928 B CN 106786928B
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- driving circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
Abstract
The invention discloses a BMS charge-discharge control protection circuit, comprising: the charging MOS driving circuit is connected with the first control input end of the charging MOS driving circuit, the second control output end of the charging MOS driving circuit is connected with the second control input end of the charging MOS driving circuit, the third control output end of the charging MOS driving circuit is connected with the first control input end of the discharging MOS driving circuit, and the fourth control output end of the charging MOS driving circuit is connected with the second control input end of the discharging MOS driving circuit; the output end of the charging MOS driving circuit is connected with the charging MOS circuit; the output end of the discharge MOS drive circuit is connected with the discharge MOS circuit; the charging MOS circuit and the discharging MOS circuit are sequentially connected between the total negative end of the battery pack and the negative end of the charger in series, and the charging and discharging MOS circuit is controlled by the MOS driving circuit driven by the multistage triode, so that the switching speed is high, the switching loss is low, the circuit is simple, and the cost is low.
Description
Technical Field
The invention relates to the field of battery management systems, in particular to a BMS charge and discharge control protection circuit.
Background
In the energy storage type battery management system, an MOS tube is needed to control and protect the charging and discharging process of a battery, the MOS tube can be placed at the positive end of the battery for control and can also be placed at the negative end for control, but when the MOS tube is turned off at the moment of control at the positive end, oscillation can be generated, the MOS tube breaks down due to the fact that the MOS tube is instantaneously high in current, and if the negative end is selected for control, the problem cannot occur. The MOS tube is controlled at the negative end, so that a special driving circuit is needed, and because the MOS tube needs excessive current, if the MOS tube is turned on or turned off for too long, the loss power of the MOS tube is too large, the loss life of the MOS tube is reduced, and the MOS tube is easy to generate heat. The existing method for rapidly switching off the MOS transistor adopts a driving chip and adopts a triode driving circuit. The former has high cost and complex circuit; the latter driving current can not meet the requirement of the high-current MOS transistor switch.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a BMS charge-discharge control protection circuit.
The aim of the invention is realized by the following technical scheme:
a BMS charge and discharge control protection circuit, comprising: the charging MOS driving circuit is connected with the first control input end of the charging MOS driving circuit, the second control output end of the charging MOS driving circuit is connected with the second control input end of the charging MOS driving circuit, the third control output end of the charging MOS driving circuit is connected with the first control input end of the discharging MOS driving circuit, and the fourth control output end of the charging MOS driving circuit is connected with the second control input end of the discharging MOS driving circuit;
the output end of the charging MOS driving circuit is connected with the charging MOS circuit;
the output end of the discharge MOS driving circuit is connected with the discharge MOS circuit;
the charging MOS circuit and the discharging MOS circuit are sequentially connected in series between the total negative end of the battery pack and the negative end of the charger.
In one embodiment, a first detection end of the control center is connected with the charging MOS driving circuit, and a second detection end of the control center is connected with the discharging MOS driving circuit;
in one embodiment, the control center includes: the device comprises an MCU control unit and an AFE analog front-end unit, wherein the MCU control unit is in signal connection with the AFE analog front-end unit;
two output ends of the MCU control unit are respectively used as a first control output end and a fourth control output end of the control center;
two output ends of the AFE analog front end unit are respectively used as a second control output end and a third control output end of the control center.
In one embodiment, the charging MOS drive circuit includes: the charging switch control unit, the charging primary current amplifying unit and the charging secondary current amplifying unit are sequentially connected;
the input end of the charging switch control unit is respectively connected with the first control output end and the second control output end of the control center, and the output end of the charging secondary current amplifying unit is respectively connected with the first detection output end of the control center and the charging MOS circuit.
In one embodiment, the charge switch control unit includes: the charging MOS driving circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first switching tube Q1, wherein one end of the first resistor R1 is used as a second control input end of the charging MOS driving circuit to be connected with a second control output end of the control center, and the other end of the first resistor R1 is respectively connected with one end of the third resistor R3 and a grid electrode of the first switching tube Q1;
one end of the second resistor R2 is used as a first control input end of the charging MOS driving circuit and is connected with a first control output end of the control center, and the other end of the second resistor R2 is connected with a grid electrode of the first switching tube Q1;
the other end of the third resistor R3 is connected with the ground GND;
the source electrode of the first switching tube Q1 is connected with the ground GND;
the charging primary current amplifying unit includes: the device comprises a fourth resistor R4, a fifth resistor R5 and a second switching tube Q2, wherein one end of the fifth resistor is connected with the drain electrode of the first switching tube Q1, and the other end of the fifth resistor is connected with the base electrode of the second switching tube Q2;
one end of the fourth resistor R4 is connected with the base electrode of the second switching tube Q2, and the other end of the fourth resistor R4 is connected with the emitter electrode of the second switching tube Q2;
the emitter of the second switching tube Q2 is connected with a power supply Vcc;
the charging secondary current amplifying unit includes: the charging MOS driving circuit comprises a sixth resistor R6, a seventh resistor R7, a third switching tube Q3 and a fourth switching tube Q4, wherein one end of the seventh resistor R7 is used as the output end of the charging MOS driving circuit and is respectively connected with the charging MOS circuit and a first detection end of the control center;
the base electrode of the fourth switching tube Q4 is respectively connected with the collector electrode of the second switching tube Q2, the base electrode of the third switching tube Q3 and one end of the sixth resistor R6, the collector electrode is connected with the power supply Vcc, and the emitter electrode is connected with one end of the seventh resistor R7;
the other end of the seventh resistor R7 is connected with the emitter of the third switching tube Q3;
the collector electrode of the third switch tube Q3 is connected with the total negative terminal of the battery pack;
the other end of the sixth resistor R6 is connected with the total negative end of the battery pack.
In one embodiment, the discharge MOS drive circuit includes: the device comprises a discharge switch control unit, a discharge primary current amplifying unit and a discharge secondary current amplifying unit, wherein the discharge switch control unit, the discharge primary current amplifying unit and the discharge secondary current amplifying unit are sequentially connected;
the input end of the discharging switch control unit is respectively connected with the third control output end and the fourth control output end of the control center, and the output end of the discharging secondary current amplifying unit is respectively connected with the first detection output end of the control center and the charging MOS circuit.
In one embodiment, the discharge switch control unit includes: a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a fifth switching tube Q5, wherein one end of the tenth resistor R10 is used as a fourth control input end of the discharge MOS driving circuit to be connected with a second control output end of the control center, and the other end of the tenth resistor R10 is respectively connected with one end of the twelfth resistor R12 and the fifth switching tube Q5;
one end of the eleventh resistor R11 is used as a third control input end of the discharging MOS driving circuit and is connected with a third control output end of the control center, and the other end of the eleventh resistor R11 is connected with a source electrode of the fifth switching tube Q5;
the other end of the twelfth resistor R12 is respectively connected with the fifth switching tube Q5 and the ground GND;
the discharging primary current amplifying unit includes: a thirteenth resistor R13, a fourteenth resistor R14, a first diode D1 and a sixth switching tube Q6, wherein one end of the thirteenth resistor R13 is connected with the drain electrode of the fifth switching tube Q5, and the other end is respectively connected with the bases of the fourteenth resistor R14 and the sixth switching tube Q6;
an emitter of the sixth switching tube Q6 is connected to one end of the fourteenth resistor R14 and the power supply Vcc, and a collector is connected to an anode of the first diode D1;
the discharge secondary current amplifying unit includes: a fifteenth resistor R15, a sixteenth resistor R16, a seventh switching tube Q7, an eighth switching tube Q8 and a second diode D2, wherein one end of the fifteenth resistor R15 is used as an output end of the discharge MOS driving circuit and is respectively connected with the discharge MOS circuit and a second detection end of the control center;
the anode of the second diode is connected with a power supply Vcc, and the cathode of the second diode is connected with the collector of the seventh switching tube Q7;
the base electrode of the seventh switching tube Q7 is respectively connected with the cathode of the first diode D1, the base electrode of the eighth switching tube Q8 and one end of the sixteenth resistor R16, and the emitter is connected with one end of the fifteenth resistor R15;
the other end of the sixteenth resistor R16 is connected with the negative electrode of the charger;
an emitter of the eighth switching tube Q8 is connected to one end of the fifteenth resistor R15, and a collector is connected to the negative electrode of the charger.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. the MOS driving circuit driven by the multistage triode is used for controlling the charging and discharging MOS circuit, so that the switching speed is high, the switching loss is low, the circuit is simple, and the cost is low.
2. The control center adopts a combined form of the MCU control unit and the AFE analog front-end unit, and when the MCU control unit fails, the AFE analog front-end unit can control the MOS tube driving circuit to work, so that the stability and the safety of the circuit are improved.
3. The control center utilizes the first detection end and the second detection end, when overcharge or overdischarge protection is started, whether the charge or discharge MOS circuit is turned off or not can be judged by detecting the voltage values of the first detection end and the second detection end, the safety coefficient of the circuit is further improved, and the stability is high.
4. The MOS tube is adopted at the negative end of the battery pack, and compared with the control of the MOS tube at the positive end of the battery pack, the safety coefficient is high, and the phenomenon that the MOS tube is easy to break down can not occur.
Drawings
Fig. 1 is a diagram of a BMS charge and discharge control protection circuit frame in the present embodiment;
fig. 2 is a diagram of a charging MOS drive circuit frame in the present embodiment;
fig. 3 is a schematic diagram of a charge MOS drive circuit in the present embodiment;
fig. 4 is a diagram of a discharge MOS drive circuit frame in the present embodiment;
fig. 5 is a schematic diagram of a discharge MOS driving circuit in the present embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, which is a frame diagram of a BMS charge-discharge control protection circuit, please refer to fig. 2 and 3 in combination, which includes: the charge MOS driving circuit 200, the discharge MOS driving circuit 300, the charge MOS circuit 400 and the discharge MOS circuit 500, wherein a first control output end of the control center 100 is connected with a first control input end of the charge MOS driving circuit 200, a second control output end is connected with a second control input end of the charge MOS driving circuit 200, a third control output end is connected with a first control input end of the discharge MOS driving circuit 300, and a fourth control output end is connected with a second control input end of the discharge MOS driving circuit 300;
the output end of the charging MOS driving circuit 200 is connected with the charging MOS circuit 400;
the output end of the discharge MOS driving circuit 300 is connected with the discharge MOS circuit 500;
the charging MOS circuit 400 and the discharging MOS circuit 500 are sequentially connected in series between the total negative terminal of the battery pack and the negative terminal of the charger.
Specifically, a first detection end of the control center 100 is connected to the charging MOS driving circuit 200, and a second detection end is connected to the discharging MOS driving circuit 300;
specifically, the control center 100 includes: the device comprises an MCU control unit 101 and an AFE analog front-end unit 102, wherein the MCU control unit 101 is in signal connection with the AFE analog front-end unit 102;
two output ends of the MCU control unit 101 are respectively used as a first control output end and a fourth control output end of the control center 100;
two outputs of the AFE analog front end unit 102 serve as a second control output and a third control output of the control center 100, respectively.
It should be noted that, when the charging of the battery pack is started, the MCU control unit 101 controls the first control output terminal (i.e., mcu_dsg in fig. 1) and the fourth control output terminal (i.e., mcu_chg in fig. 1) to control the charging MOS driving circuit 200 to cause the charging MOS circuit 400 to start operating, and when detecting that the voltage of the battery reaches the alarm value of overcharge, the MCU control unit 101 controls the charging driving circuit 200 to turn off the charging MOS circuit by controlling the first control output terminal, and the battery pack stops charging.
It should be further noted that, when the discharging of the battery pack is started, the MCU control unit 101 controls the first control output terminal (i.e., mcu_dsg in fig. 1) and the fourth control output terminal (i.e., mcu_chg in fig. 1) to control the discharging MOS driving circuit to cause the charging MOS circuit 400 to start operating, and when detecting that the voltage of the battery reaches the over-discharging alarm value, the MCU control unit 101 controls the discharging driving circuit 300 to turn off the discharging MOS circuit by controlling the fourth control output terminal, and the discharging of the battery pack is stopped.
It should be noted that, the AFE analog front end unit 102 may also control the charge MOS driving circuit 200 and the discharge MOS driving circuit 300 through the second control output end (i.e., GPOH1 in fig. 1) and the third control output end (i.e., GPOH2 in fig. 1), further control the charge MOS circuit 400 and the discharge MOS circuit 500, and start the control of the AFE analog front end unit 102 when the MCU control unit 101 fails to work due to a special situation, so as to improve the safety of the circuit.
It should be further noted that, by detecting the voltage values of the two points of the first detection terminal (i.e., back_dhg of fig. 1) and the second detection terminal (i.e., back_chg of fig. 1), it is determined whether the charge MOS circuit 400 and the discharge MOS circuit 500 have been turned off.
Specifically, the charging MOS drive circuit 200 includes: the charging switch control unit 201, the charging primary current amplification unit 202 and the charging secondary current amplification unit 203 are sequentially connected;
the input end of the charging switch control unit 201 is connected to the first control output end and the second control output end of the control center 100, and the output end of the charging secondary current amplifying unit 203 is connected to the first detection output end of the control center 100 and the charging MOS circuit 400.
Further, the charge switch control unit 201 includes: the charging MOS driving circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first switching tube Q1, wherein one end of the first resistor R1 is used as a second control input end of the charging MOS driving circuit 200 to be connected with a second control output end of the control center 100, and the other end of the first resistor R1 is respectively connected with one end of the third resistor R3 and a grid electrode of the first switching tube Q1;
one end of the second resistor R2 is connected to the first control output end of the control center 100 as a first control input end of the charging MOS driving circuit 200, and the other end is connected to the gate of the first switching tube Q1;
the other end of the third resistor R3 is connected with the ground GND;
the source electrode of the first switching tube Q1 is connected with the ground GND;
the charging primary current amplifying unit 202 includes: the device comprises a fourth resistor R4, a fifth resistor R5 and a second switching tube Q2, wherein one end of the fifth resistor is connected with the drain electrode of the first switching tube Q1, and the other end of the fifth resistor is connected with the base electrode of the second switching tube Q2;
one end of the fourth resistor R4 is connected with the base electrode of the second switching tube Q2, and the other end of the fourth resistor R4 is connected with the emitter electrode of the second switching tube Q2;
the emitter of the second switching tube Q2 is connected with a power supply Vcc;
the charging secondary current amplifying unit 203 includes: a sixth resistor R6, a seventh resistor R7, a third switching tube Q3, and a fourth switching tube Q4, where one end of the seventh resistor R7 is used as an output end of the charging MOS driving circuit 200 and is connected to the charging MOS circuit and the first detection end of the control center 100 respectively;
the base electrode of the fourth switching tube Q4 is respectively connected with the collector electrode of the second switching tube Q2, the base electrode of the third switching tube Q3 and one end of the sixth resistor R6, the collector electrode is connected with the power supply Vcc, and the emitter electrode is connected with one end of the seventh resistor R7;
the other end of the seventh resistor R7 is connected with the emitter of the third switching tube Q3;
the collector electrode of the third switch tube Q3 is connected with the total negative terminal of the battery pack;
the other end of the sixth resistor R6 is connected with the total negative end of the battery pack.
It should be noted that, referring to fig. 2, when the first control output terminal is at a high level, the first switching tube Q1 is turned on, the drain electrode is at a low level, the base potential of the second switching tube Q2 is pulled down, the second switching tube Q2 is turned on, the emitter electrode of the second switching tube Q2 is pulled up, that is, the base electrode of the fourth switching tube Q4 is at a high level, and the fourth switching tube Q4 is turned on, at this time, the charging MOS driving circuit 200 outputs a high level to control the charging MOS circuit 400 to work and start charging;
when the first control output end is at a low level, the first switching tube Q1 is turned off, the second switching tube Q2 is also turned off, the base of the third switching tube Q3 is pulled down by the sixth resistor R6, and because the third switching tube Q3 is a PNP tube, the third switching tube Q3 is turned on, at this time, the charging MOS driving circuit 200 outputs a low level, and controls the charging MOS circuit 400 to stop working, stop charging, achieve the purpose of quick turn-off, and reduce the switching loss of the MOS tube.
Specifically, the discharge MOS drive circuit 300 includes: the discharging switch control unit 301, the discharging primary current amplifying unit 302 and the discharging secondary current amplifying unit 303 are sequentially connected;
the input end of the discharging switch control unit 301 is connected to the third control output end and the fourth control output end of the control center 100, and the output end of the discharging secondary current amplifying unit 303 is connected to the first detection output end of the control center 100 and the charging MOS circuit 300.
Further, the discharge switch control unit 301 includes: a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fifth switching tube Q5, wherein one end of the tenth resistor R10 is used as a fourth control input end of the discharge MOS driving circuit 300 to be connected to a second control output end of the control center 100, and the other end is respectively connected to one end of the twelfth resistor R12 and the fifth switching tube Q5;
one end of the eleventh resistor R11 is connected to the third control output end of the control center 100 as the third control input end of the discharging MOS driving circuit 300, and the other end is connected to the source electrode of the fifth switching tube Q5;
the other end of the twelfth resistor R12 is respectively connected with the fifth switching tube Q5 and the ground GND;
the discharging primary current amplifying unit 302 includes: a thirteenth resistor R13, a fourteenth resistor R14, a first diode D1 and a sixth switching tube Q6, wherein one end of the thirteenth resistor R13 is connected with the drain electrode of the fifth switching tube Q5, and the other end is respectively connected with the bases of the fourteenth resistor R14 and the sixth switching tube Q6;
an emitter of the sixth switching tube Q6 is connected to one end of the fourteenth resistor R14 and the power supply Vcc, and a collector is connected to an anode of the first diode D1;
the discharge secondary current amplifying unit (303) includes: a fifteenth resistor R15, a sixteenth resistor R16, a seventh switching tube Q7, an eighth switching tube Q8 and a second diode D2, wherein one end of the fifteenth resistor R15 is used as an output end of the discharge MOS driving circuit (300) and is respectively connected with the discharge MOS circuit and a second detection end of the control center (100);
the anode of the second diode D2 is connected with a power supply Vcc, and the cathode of the second diode D2 is connected with the collector of the seventh switching tube Q7;
the base electrode of the seventh switching tube Q7 is respectively connected with the cathode of the first diode D1, the base electrode of the eighth switching tube Q8 and one end of the sixteenth resistor R16, and the emitter is connected with one end of the fifteenth resistor R15;
the other end of the sixteenth resistor R16 is connected with the negative electrode of the charger;
an emitter of the eighth switching tube Q8 is connected to one end of the fifteenth resistor R15, and a collector is connected to the negative electrode of the charger.
The operation principle of the discharge MOS drive circuit 300 is the same as that of the charge MOS drive circuit 200, and the operation principle of the discharge MOS drive circuit 300 will not be described in detail.
The first diode D1 is connected between the seventh switching tube Q7 and the sixth switching tube Q6, so as to prevent the reverse flow of the load current, and damage the seventh switching tube Q7, the sixth switching tube Q6, and the power supply Vcc.
It should be noted that, the charging MOS driving circuit 200 further includes a charging output protection unit 204, where the charging output protection unit 204 is composed of a resistor, a capacitor, and a zener diode, so as to stabilize the output of the charging MOS driving circuit 200 and improve the stability of the circuit, and similarly, the discharging MOS driving circuit 300 also includes a discharging output protection unit 205, and the discharging output protection unit 205 is also composed of a resistor, a capacitor, and a zener diode, so as to stabilize the output of the discharging MOS driving circuit 300.
The above embodiments represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. A BMS charge and discharge control protection circuit, comprising: the charging MOS driving circuit comprises a control center (100), a charging MOS driving circuit (200), a discharging MOS driving circuit (300), a charging MOS circuit (400) and a discharging MOS circuit (500), wherein a first control output end of the control center (100) is connected with a first control input end of the charging MOS driving circuit (200), a second control output end of the control center is connected with a second control input end of the charging MOS driving circuit (200), a third control output end of the control center is connected with a first control input end of the discharging MOS driving circuit (300), and a fourth control output end of the control center is connected with a second control input end of the discharging MOS driving circuit (300);
a first detection end of the control center (100) is connected with the charging MOS driving circuit (200), and a second detection end of the control center is connected with the discharging MOS driving circuit (300);
the output end of the charging MOS driving circuit (200) is connected with the charging MOS circuit (400);
the output end of the discharge MOS driving circuit (300) is connected with the discharge MOS circuit (500);
the charging MOS circuit (400) and the discharging MOS circuit (500) are connected in series between the total negative end of the battery pack and the negative end of the charger;
the charging MOS driving circuit (200) includes: the charging switch control unit (201), the charging primary current amplifying unit (202) and the charging secondary current amplifying unit (203) are sequentially connected; the input end of the charging switch control unit (201) is respectively connected with a first control output end and a second control output end of the control center (100), and the output end of the charging secondary current amplification unit (203) is respectively connected with a first detection output end of the control center (100) and a charging MOS circuit (400);
the charge switch control unit (201) includes: the charging MOS driving circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first switching tube Q1, wherein one end of the first resistor R1 is used as a second control input end of the charging MOS driving circuit (200) to be connected with a second control output end of the control center (100), and the other end of the first resistor R1 is respectively connected with one end of the third resistor R3 and a grid electrode of the first switching tube Q1;
one end of the second resistor R2 is used as a first control input end of the charging MOS driving circuit (200) and is connected with a first control output end of the control center (100), and the other end of the second resistor R2 is connected with a grid electrode of the first switching tube Q1;
the other end of the third resistor R3 is connected with the ground GND;
the source electrode of the first switching tube Q1 is connected with the ground GND;
the charging primary current amplifying unit (202) includes: the device comprises a fourth resistor R4, a fifth resistor R5 and a second switching tube Q2, wherein one end of the fifth resistor is connected with the drain electrode of the first switching tube Q1, and the other end of the fifth resistor is connected with the base electrode of the second switching tube Q2;
one end of the fourth resistor R4 is connected with the base electrode of the second switching tube Q2, and the other end of the fourth resistor R4 is connected with the emitter electrode of the second switching tube Q2;
the emitter of the second switching tube Q2 is connected with a power supply Vcc;
the charging secondary current amplifying unit (203) includes: a sixth resistor R6, a seventh resistor R7, a third switching tube Q3 and a fourth switching tube Q4, wherein one end of the seventh resistor R7 is used as an output end of the charging MOS driving circuit (200) and is respectively connected with the charging MOS circuit and a first detection end of the control center (100);
the base electrode of the fourth switching tube Q4 is respectively connected with the collector electrode of the second switching tube Q2, the base electrode of the third switching tube Q3 and one end of the sixth resistor R6, the collector electrode is connected with the power supply Vcc, and the emitter electrode is connected with one end of the seventh resistor R7;
the other end of the seventh resistor R7 is connected with the emitter of the third switching tube Q3;
the collector electrode of the third switch tube Q3 is connected with the total negative terminal of the battery pack;
the other end of the sixth resistor R6 is connected with the total negative end of the battery pack.
2. The BMS charge and discharge control protection circuit according to claim 1, wherein said control center (100) comprises: the device comprises an MCU control unit (101) and an AFE analog front-end unit (102), wherein the MCU control unit (101) is in signal connection with the AFE analog front-end unit (102);
two output ends of the MCU control unit (101) are respectively used as a first control output end and a fourth control output end of the control center (100);
two outputs of the AFE analog front end unit (102) are respectively used as a second control output and a third control output of the control center (100).
3. The BMS charge-discharge control protection circuit according to claim 1, wherein the discharge MOS drive circuit (300) comprises: the device comprises a discharge switch control unit (301), a discharge primary current amplifying unit (302) and a discharge secondary current amplifying unit (303), wherein the discharge switch control unit (301), the discharge primary current amplifying unit (302) and the discharge secondary current amplifying unit (303) are sequentially connected;
the input end of the discharging switch control unit (301) is respectively connected with the third control output end and the fourth control output end of the control center (100), and the output end of the discharging secondary current amplifying unit (303) is respectively connected with the first detection output end of the control center (100) and the discharging MOS circuit (500).
4. The BMS charge-discharge control protection circuit according to claim 3, wherein the discharge switch control unit (301) comprises: a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fifth switching tube Q5, wherein one end of the tenth resistor R10 is used as a fourth control input end of the discharge MOS driving circuit (300) and is connected with a second control output end of the control center (100), and the other end is respectively connected with one end of the twelfth resistor R12 and the fifth switching tube Q5;
one end of the eleventh resistor R11 is used as a third control input end of the discharging MOS driving circuit (300) and is connected with a third control output end of the control center (100), and the other end of the eleventh resistor R is connected with a source electrode of the fifth switching tube Q5;
the other end of the twelfth resistor R12 is respectively connected with the fifth switching tube Q5 and the ground GND;
the discharge primary current amplifying unit (302) includes: a thirteenth resistor R13, a fourteenth resistor R14, a first diode D1 and a sixth switching tube Q6, wherein one end of the thirteenth resistor R13 is connected with the drain electrode of the fifth switching tube Q5, and the other end is respectively connected with the bases of the fourteenth resistor R14 and the sixth switching tube Q6;
an emitter of the sixth switching tube Q6 is connected to one end of the fourteenth resistor R14 and the power supply Vcc, and a collector is connected to an anode of the first diode D1;
the discharge secondary current amplifying unit (303) includes: a fifteenth resistor R15, a sixteenth resistor R16, a seventh switching tube Q7, an eighth switching tube Q8 and a second diode D2, wherein one end of the fifteenth resistor R15 is used as an output end of the discharge MOS driving circuit (300) and is respectively connected with the discharge MOS circuit and a second detection end of the control center (100);
the anode of the second diode is connected with a power supply Vcc, and the cathode of the second diode is connected with the collector of the seventh switching tube Q7;
the base electrode of the seventh switching tube Q7 is respectively connected with the cathode of the first diode D1, the base electrode of the eighth switching tube Q8 and one end of the sixteenth resistor R16, and the emitter is connected with one end of the fifteenth resistor R15;
the other end of the sixteenth resistor R16 is connected with the negative electrode of the charger;
an emitter of the eighth switching tube Q8 is connected to one end of the fifteenth resistor R15, and a collector is connected to the negative electrode of the charger.
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