A battery multiple overcurrent protection circuit and chip

Abstract

The present invention discloses a battery multiple overcurrent protection circuit and chip, which relates to the field of battery protection technology, including a power module for power supply; a first battery control module, which is connected in series with a second battery control module and a third battery control module, and is used for power transmission control, energy storage and power-off control; a shunt overcurrent detection module for overcurrent detection; a power supply control module, which supplies power to a timing switching module when overcurrent occurs; a timing switching module, which is used to time the first battery control module, the second battery control module and the third battery control module for overcurrent detection; and a shunt protection module, which is used to perform power-off control on a battery control module where overcurrent occurs. The battery multiple overcurrent protection circuit and chip of the present invention can perform power-off control on a battery control module where overcurrent occurs, maintain normal charging of the battery control module, ensure the charging efficiency of the battery, avoid the influence of abnormal single cells on the overall battery, and increase the service life of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery protection, and in particular to a battery multiple overcurrent protection circuit and chip. Background Art

[0002] As battery charging technology becomes more and more mature, the charging power of batteries continues to increase. During the battery charging process, heat and gas will be generated inside the battery. When the charging time is too long, it is easy to cause overcurrent in the battery and burn the battery. In order to protect the battery from overcurrent, the battery overcurrent protection circuit in the prior art will perform overcurrent detection on the entire battery connected in series and perform power-off protection when overcurrent occurs. However, since the existing batteries generally use a plurality of single cells connected in series, when overcurrent occurs, the battery will not be able to continue charging, thereby reducing the charging efficiency. In addition, since it is impossible to automatically and effectively detect the faulty single cell, the temperature of the single cell with overcurrent will rise rapidly, affecting the surrounding single cells. Therefore, there is room for improvement. Summary of the invention

[0003] The embodiments of the present invention provide a battery multiple over-current protection circuit and chip to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a battery multiple overcurrent protection circuit is provided, comprising: a power module, a first battery control module, a second battery control module, a third battery control module, a shunt overcurrent detection module, a power supply control module, a timing switching module and a shunt protection module;

[0005] The power module is used to receive direct current power, stabilize the direct current power and output working power;

[0006] A first battery control module is connected to the power module, the shunt protection module, the second battery control module and the timing switching module, and is used to transmit direct current power to the connected first battery and control the charging of the first battery, provide first power, stop receiving direct current power and transmit direct current power to the second battery control module when receiving a first protection signal output by the shunt protection module, and output second detection power when receiving a first control signal output by the timing switching module;

[0007] A second battery control module is connected to the shunt protection module, the third battery control module and the timing switching module, and is used to transmit the first electric energy or DC electric energy to the connected second battery and control the charging of the second battery, provide the second electric energy, and when receiving the second protection signal output by the shunt protection module, stop receiving the first electric energy or DC electric energy and transmitting it to the third battery control module, and when receiving the second control signal output by the timing switching module, output the third detection electric energy;

[0008] a third battery control module, connected to the shunt protection module and the timing switching module, and used for transmitting the first electric energy, the DC electric energy or the second electric energy to the connected third battery and controlling the charging of the third battery, and when receiving the third protection signal output by the shunt protection module, stopping receiving the first electric energy, the DC electric energy or the second electric energy, and providing the first detection electric energy and the fourth detection electric energy;

[0009] a branch overcurrent detection module, connected to the power module, the first battery control module, the second battery control module and the third battery control module, for performing current sampling and signal conditioning on the first detection electric energy, the second detection electric energy, the third detection electric energy or the fourth detection electric energy, and outputting a first level signal when the regulated signal is greater than a set overcurrent threshold;

[0010] The power supply control module, together with the power supply module, the timing switching module and the branch overcurrent detection module, is used to perform self-locking processing on the first level signal and transmit the working power to the timing switching module when receiving the first level signal, and stop the signal self-locking work when receiving the fourth control signal output by the timing switching module;

[0011] A timing switching module, used to set the timing time, and when receiving the working power transmitted by the power supply control module, start the timing work and output the first control signal, the second control signal, the third control signal and the fourth control signal in sequence;

[0012] The shunt protection module is used to self-lock and output the first protection signal when receiving the first control signal and the first level signal, self-lock and output the second protection signal when receiving the second control signal and the first level signal, and self-lock and output the third protection signal when receiving the third control signal and the first level signal.

[0013] As a further solution of the present invention: the power module includes a power interface; the first battery control module includes a first unipolar transistor, a first resistor, a first triode, a first interface, a second unipolar transistor and a third unipolar transistor;

[0014] Preferably, the first end of the power interface is connected to the drain of the second unipolar transistor, the drain of the first unipolar transistor, and the gate of the first unipolar transistor and the collector of the first triode through the first resistor, the source of the first unipolar transistor is connected to the first end of the first interface, the second end of the first interface is connected to the source of the second unipolar transistor, the drain of the third unipolar transistor and the second battery control module, the source of the third unipolar transistor is connected to the shunt overcurrent detection module, the gate of the third unipolar transistor is connected to the shunt protection module, the base of the first triode is connected to the gate of the second unipolar transistor, and the emitter of the first triode is connected to the second end of the power interface and the ground.

[0015] As a further solution of the present invention: the second battery control module includes a fourth unipolar transistor, a second resistor, a first crystal diode, a second triode, a fifth unipolar transistor, a sixth unipolar transistor and a second interface;

[0016] Preferably, the drain of the fourth unipolar transistor is connected to the drain of the fifth unipolar transistor and the second end of the first interface and is connected to the gate of the fourth unipolar transistor and the collector of the second triode through the second resistor, the base of the second triode is connected to the cathode of the first crystal diode and the gate of the fifth unipolar transistor, the anode of the first crystal diode is connected to the gate of the third unipolar transistor, the emitter of the second triode is connected to the second end of the power interface, the source of the fourth unipolar transistor is connected to the first end of the second interface, the second end of the second interface is connected to the source of the fifth unipolar transistor, the drain of the sixth unipolar transistor and the third battery control module, the source of the sixth unipolar transistor is connected to the source of the third unipolar transistor, and the gate of the sixth unipolar transistor is connected to the shunt protection module.

[0017] As a further solution of the present invention: the third battery control module includes a third resistor, a seventh unipolar transistor, a second crystal diode, a third triode, an eighth unipolar transistor and a third interface;

[0018] Preferably, the drain of the seventh unipolar transistor is connected to the second end of the second interface and the drain of the eighth unipolar transistor and is connected to the gate of the seventh unipolar transistor and the collector of the third triode through the third resistor, the base of the third triode is connected to the cathode of the second crystal diode and the gate of the eighth unipolar transistor, the anode of the second crystal diode is connected to the gate of the sixth unipolar transistor, the emitter of the third triode is grounded, the source of the seventh unipolar transistor is connected to the first end of the third interface, and the second end of the third interface is connected to the source of the eighth unipolar transistor and the source of the sixth unipolar transistor.

[0019] As a further solution of the present invention: the power supply module further includes a voltage regulator; the shunt overcurrent detection module includes a fourth resistor, a fifth resistor, a first capacitor, a first operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a voltage comparator and a ninth resistor;

[0020] Preferably, the input end of the voltage regulator is connected to the first end of the power interface, the second end of the power interface is connected to the inverting end of the voltage comparator and one end of the eighth resistor through a ninth resistor, the non-inverting end of the voltage comparator is connected to the output end of the first operational amplifier and is connected to the inverting end of the first operational amplifier and one end of the sixth resistor through a seventh resistor, the non-inverting end of the first operational amplifier is connected to one end of the first capacitor and is connected to one end of the fourth resistor and the source of the third unipolar transistor through a fifth resistor, the other end of the sixth resistor is connected to the other end of the eighth resistor, the other end of the first capacitor, the other end of the fourth resistor and the second end of the power interface, and the output end of the voltage comparator is connected to the shunt protection module.

[0021] As a further solution of the present invention: the power supply control module includes a tenth resistor, a fifth triode, a fourth crystal diode, a fifth crystal diode, a first gate logic device and a ninth unipolar transistor;

[0022] Preferably, the drain of the ninth unipolar transistor is connected to the output end of the voltage regulator and is connected to the collector of the fifth triode and the A end of the first gate logic device through the tenth resistor, the B end of the first gate logic device is connected to the cathode of the fifth crystal diode and the cathode of the fourth crystal diode, the anode of the fourth crystal diode is connected to the output end of the voltage comparator, the anode of the fifth crystal diode is connected to the Y end of the first gate logic device and the gate of the ninth unipolar transistor, the source of the ninth unipolar transistor is connected to the timing switching module, and the emitter of the fifth triode is grounded.

[0023] As a further solution of the present invention: the timing switching module includes a sixth crystal diode, a seventh crystal diode, a first potentiometer, a second potentiometer, a second capacitor, an eleventh resistor, a first timer, a third capacitor, a twelfth resistor, a fourth transistor, a fourth capacitor and a first counter;

[0024] Preferably, the fourth end and the eighth end of the first timer are connected to the collector of the fourth triode and the sixteenth end of the first counter and are connected to the seventh end of the first timer, the cathode of the seventh crystal diode, the anode of the sixth crystal diode and the source of the ninth unipolar transistor through an eleventh resistor, the cathode of the sixth crystal diode is connected to one end of the first potentiometer and the slider end, the anode of the seventh crystal diode is connected to one end of the second potentiometer and the slider end, the other end of the first potentiometer is connected to the other end of the second potentiometer, the sixth end and the second end of the first timer and are grounded through the second capacitor, the fifth end of the first timer is grounded through the third capacitor, the third end of the first timer is connected to the base of the fourth triode, the emitter of the fourth triode is connected to the fourteenth end of the counter and one end of the fourth capacitor and is connected to the other end of the fourth capacitor, the first end of the first timer, the ground end, the thirteenth end, the fifteenth end and the eighth end of the first counter through a twelfth resistor, the third end and the second end of the first counter are respectively connected to the gate of the third unipolar transistor and the gate of the sixth unipolar transistor, the fourth end of the first counter is connected to the shunt protection module, and the seventh end of the first counter is connected to the base of the fifth triode.

[0025] As a further solution of the present invention: the shunt protection module includes an eighth crystal diode, a ninth crystal diode, a tenth crystal diode, an eleventh crystal diode, a second gate logic device, a second control device and a third control device;

[0026] Preferably, the anode of the eighth crystal diode is connected to the second end of the first counter, the cathode of the eighth crystal diode is connected to the cathode of the ninth crystal diode and the A end of the first gate logic device, the B end of the first gate logic device is connected to the cathode of the tenth crystal diode and the cathode of the eleventh crystal diode, the anode of the tenth crystal diode is connected to the anode of the ninth crystal diode, the Y end of the first gate logic device and the gate of the second unipolar transistor, the cathode of the eleventh crystal diode is connected to the output end of the voltage comparator, the first end of the second control device and the first end of the third control device, the second end and the third end of the second control device are respectively connected to the second end of the first counter and the gate of the fifth unipolar transistor, and the second end and the third end of the third control device are respectively connected to the fourth end of the first counter and the gate of the eighth unipolar transistor.

[0027] The present invention further discloses a chip, comprising the battery multiple over-current protection circuit as described in any one of the above items.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the battery multiple overcurrent protection circuit and chip of the present invention are charged in series through the first battery control module, the second battery control module and the third battery control module. When the shunt overcurrent detection module detects that an overcurrent occurs in the series path, it cooperates with the power supply control module to trigger the timing switching module to start timing work, and the timing cycle controls the first battery control module, the second battery control module or the third battery control module to perform separate overcurrent detection, and the shunt protection module is used to individually cut off the power supply to the battery control module with an overcurrent fault, so as to maintain the normal charging operation of the battery control module, ensure the charging efficiency of the battery, avoid the influence of abnormal single cells on the overall battery, and improve the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 A schematic block diagram of a battery multiple overcurrent protection circuit provided in an embodiment of the present invention.

[0031] Figure 2 A circuit diagram of a battery multiple overcurrent protection circuit provided by an embodiment of the present invention.

[0032] Figure 3 A circuit diagram of a timing switching module provided in an embodiment of the present invention.

[0033] Figure 4 A circuit diagram of a shunt protection module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In one embodiment, see Figure 1 , a battery multiple overcurrent protection circuit, comprising: a power module 1, a first battery control module 2, a second battery control module 3, a third battery control module 4, a shunt overcurrent detection module 5, a power supply control module 6, a timing switching module 7 and a shunt protection module 8;

[0036] Specifically, the power module 1 is used to receive direct current power, stabilize the direct current power and output working power;

[0037] The first battery control module 2 is connected to the power module 1, the shunt protection module 8, the second battery control module 3 and the timing switching module 7, and is used to transmit DC power to the connected first battery and control the charging of the first battery, provide the first power, and when receiving the first protection signal output by the shunt protection module 8, stop receiving the DC power and transmit the DC power to the second battery control module 3, and when receiving the first control signal output by the timing switching module 7, output the second detection power;

[0038] The second battery control module 3 is connected to the shunt protection module 8, the third battery control module 4 and the timing switching module 7, and is used to transmit the first electric energy or DC electric energy to the connected second battery and control the charging of the second battery, provide the second electric energy, and when receiving the second protection signal output by the shunt protection module 8, stop receiving the first electric energy or DC electric energy and transmitting it to the third battery control module 4, and when receiving the second control signal output by the timing switching module 7, output the third detection electric energy;

[0039] The third battery control module 4 is connected to the shunt protection module 8 and the timing switching module 7, and is used to transmit the first electric energy, DC electric energy or the second electric energy to the connected third battery and control the charging of the third battery. When receiving the third protection signal output by the shunt protection module 8, the third battery control module 4 stops receiving the first electric energy, DC electric energy or the second electric energy, and provides the first detection electric energy and the fourth detection electric energy;

[0040] A branch overcurrent detection module 5, connected to the power module 1, the first battery control module 2, the second battery control module 3 and the third battery control module 4, for performing current sampling and signal conditioning on the first detection electric energy, the second detection electric energy, the third detection electric energy or the fourth detection electric energy, and outputting a first level signal when the regulated signal is greater than a set overcurrent threshold;

[0041] The power supply control module 6, together with the power supply module 1, the timing switching module 7 and the branch overcurrent detection module 5, is used to perform self-locking processing on the first level signal and transmit the working power to the timing switching module 7 when receiving the first level signal, and stop the signal self-locking work when receiving the fourth control signal output by the timing switching module 7;

[0042] The timing switching module 7 is used to set the timing time. When receiving the working power transmitted by the power supply control module 6, it starts the timing work and outputs the first control signal, the second control signal, the third control signal and the fourth control signal in sequence;

[0043] The shunt protection module 8 is used to self-lock and output the first protection signal when receiving the first control signal and the first level signal, self-lock and output the second protection signal when receiving the second control signal and the first level signal, and self-lock and output the third protection signal when receiving the third control signal and the first level signal.

[0044] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface and a voltage regulator, can be connected to DC power and perform voltage regulation on the DC power; the first battery control module 2 can adopt a first battery control circuit composed of a field effect tube, a triode, a battery interface, etc., which is connected to the battery by the battery interface, and can control the connection state of the battery interface with the power supply module 1, the second battery control module 3 and the branch overcurrent detection module 5 to achieve power transmission, energy storage and overcurrent power-off protection control; the second battery control module 3 can adopt a second battery control circuit composed of a field effect tube, a triode, a power supply interface, etc., which is connected to the battery by the battery interface, and can control the connection state of the battery interface with the first battery control module 2, the second battery module and the branch detection module to achieve power transmission, energy storage and overcurrent power-off protection control; the third battery control module 4 can adopt a third battery control circuit composed of a field effect tube, a triode, a power supply interface, etc., which is connected to the battery by the battery interface, and can control the connection state of the battery interface with the second battery control module 3 and the branch detection module to achieve power transmission, energy storage and overcurrent power-off protection control; The overcurrent detection module 5 can use resistors, operational amplifiers, comparators, etc. to form a shunt current detection circuit, which can perform overcurrent sampling on the first battery control module 2, the second battery control module 3 and the third battery control module 4, convert the sampled signal into a voltage signal and perform amplification and filtering processing, set the overcurrent threshold, and compare the processed signal with the overcurrent threshold; the power supply control module 6 can use a power supply control circuit composed of field effect tubes, gate logic devices, triodes, crystal diodes, etc., and can transmit the power output by the power supply module 1 to the timing switching module 7 when overcurrent occurs; the timing switching module 7 can use a timing switching circuit composed of a timer, a counter, a triode, a resistor, etc., which can set the timing time and output a control signal to control the power transmission state of the first battery control module 2, the second battery control module 3 and the third battery control module 4 at a fixed time; the shunt protection module 8 can use a shunt protection circuit composed of gate logic devices, a second control device, a third control device, etc., and can perform power-off protection control on the first battery control module 2, the second battery control module 3 and the third battery control module 4 when overcurrent occurs.

[0045] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4, the power module 1 includes a power interface; the first battery control module 2 includes a first unipolar transistor Q1, a first resistor R1, a first triode V1, a first interface, a second unipolar transistor Q2 and a third unipolar transistor Q3;

[0046] Specifically, the first end of the power interface is connected to the drain of the second unipolar transistor Q2, the drain of the first unipolar transistor Q1, and the gate of the first unipolar transistor Q1 and the collector of the first triode V1 through the first resistor R1, the source of the first unipolar transistor Q1 is connected to the first end of the first interface, the second end of the first interface is connected to the source of the second unipolar transistor Q2, the drain of the third unipolar transistor Q3 and the second battery control module 3, the source of the third unipolar transistor Q3 is connected to the shunt overcurrent detection module 5, the gate of the third unipolar transistor Q3 is connected to the shunt protection module 8, the base of the first triode V1 is connected to the gate of the second unipolar transistor Q2, and the emitter of the first triode V1 is connected to the second end of the power interface and the ground.

[0047] In a specific embodiment, the first unipolar transistor Q1, the second unipolar transistor Q2 and the third unipolar transistor Q3 can all be N-channel field effect transistors, wherein the first unipolar transistor Q1 controls the charging operation of the first interface, the second unipolar transistor Q2 controls the power-off operation of the first interface, and the third unipolar transistor Q3 controls the branch overcurrent detection module 5 to perform overcurrent judgment on the first interface; the first triode V1 can be an NPN triode.

[0048] Further, the second battery control module 3 includes a fourth unipolar transistor Q4, a second resistor R2, a first crystal diode D1, a second triode V2, a fifth unipolar transistor Q5, a sixth unipolar transistor Q6 and a second interface;

[0049] Specifically, the drain of the fourth unipolar transistor Q4 is connected to the drain of the fifth unipolar transistor Q5 and the second end of the first interface and is connected to the gate of the fourth unipolar transistor Q4 and the collector of the second triode V2 through the second resistor R2, the base of the second triode V2 is connected to the cathode of the first crystal diode D1 and the gate of the fifth unipolar transistor Q5, the anode of the first crystal diode D1 is connected to the gate of the third unipolar transistor Q3, the emitter of the second triode V2 is connected to the second end of the power interface, the source of the fourth unipolar transistor Q4 is connected to the first end of the second interface, the second end of the second interface is connected to the source of the fifth unipolar transistor Q5, the drain of the sixth unipolar transistor Q6 and the third battery control module 4, the source of the sixth unipolar transistor Q6 is connected to the source of the third unipolar transistor Q3, and the gate of the sixth unipolar transistor Q6 is connected to the shunt protection module 8.

[0050] In a specific embodiment, the fourth unipolar transistor Q4, the fifth unipolar transistor Q5 and the sixth unipolar transistor Q6 can all be N-channel field effect transistors, wherein the fourth unipolar transistor Q4 controls the charging operation of the second interface, the fifth unipolar transistor Q5 controls the power-off operation of the second interface, and the sixth unipolar transistor Q6 controls the branch overcurrent detection module 5 to perform overcurrent judgment on the second interface; the second transistor V2 can be an NPN transistor.

[0051] Further, the third battery control module 4 includes a third resistor R3, a seventh unipolar transistor Q7, a second crystal diode D2, a third triode V3, an eighth unipolar transistor Q8 and a third interface;

[0052] Specifically, the drain of the seventh unipolar transistor Q7 is connected to the second end of the second interface and the drain of the eighth unipolar transistor Q8 and is connected to the gate of the seventh unipolar transistor Q7 and the collector of the third triode V3 through the third resistor R3, the base of the third triode V3 is connected to the cathode of the second crystal diode D2 and the gate of the eighth unipolar transistor Q8, the anode of the second crystal diode D2 is connected to the gate of the sixth unipolar transistor Q6, the emitter of the third triode V3 is grounded, the source of the seventh unipolar transistor Q7 is connected to the first end of the third interface, and the second end of the third interface is connected to the source of the eighth unipolar transistor Q8 and the source of the sixth unipolar transistor Q6.

[0053] In a specific embodiment, the seventh unipolar transistor Q7 and the eighth unipolar transistor Q8 can both be N-channel field effect transistors, wherein the seventh unipolar transistor Q7 controls the charging operation of the third interface, and the eighth unipolar transistor Q8 controls the power-off operation of the third interface; the third transistor V3 can be an NPN transistor.

[0054] Further, the power module 1 also includes a voltage regulator T1; the shunt overcurrent detection module 5 includes a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a first operational amplifier OP1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a voltage comparator A1 and a ninth resistor R9;

[0055] Specifically, the input end of the voltage regulator T1 is connected to the first end of the power interface, the second end of the power interface is connected to the inverting end of the voltage comparator A1 and one end of the eighth resistor R8 through the ninth resistor R9, the non-inverting end of the voltage comparator A1 is connected to the output end of the first operational amplifier OP1 and the inverting end of the first operational amplifier OP1 and one end of the sixth resistor R6 through the seventh resistor R7, the non-inverting end of the first operational amplifier OP1 is connected to one end of the first capacitor C1 and one end of the fourth resistor R4 and the source of the third unipolar transistor Q3 through the fifth resistor R5, the other end of the sixth resistor R6 is connected to the other end of the eighth resistor R8, the other end of the first capacitor C1, the other end of the fourth resistor R4 and the second end of the power interface, and the output end of the voltage comparator A1 is connected to the shunt protection module 8.

[0056] In a specific embodiment, the voltage regulator T1 may use LM317; the fourth resistor R4 performs current sampling; the first operational amplifier OP1 may use OP07 operational amplifier, and cooperate with the fifth resistor R5, the first capacitor C1, the sixth resistor R6 and the seventh resistor R7 to perform signal conversion, amplification and filtering processing; the voltage comparator A1 may use LM358 comparator; the ninth resistor R9 and the eighth resistor R8 set the overcurrent threshold.

[0057] Further, the power supply control module 6 includes a tenth resistor R10, a fifth triode V5, a fourth crystal diode D4, a fifth crystal diode D5, a first gate logic device J1 and a ninth unipolar transistor Q9;

[0058] Specifically, the drain of the ninth unipolar transistor Q9 is connected to the output end of the voltage regulator T1 and is connected to the collector of the fifth triode V5 and the A end of the first gate logic device J1 through the tenth resistor R10, the B end of the first gate logic device J1 is connected to the cathode of the fifth crystal diode D5 and the cathode of the fourth crystal diode D4, the anode of the fourth crystal diode D4 is connected to the output end of the voltage comparator A1, the anode of the fifth crystal diode D5 is connected to the Y end of the first gate logic device J1 and the gate of the ninth unipolar transistor Q9, the source of the ninth unipolar transistor Q9 is connected to the timing switching module 7, and the emitter of the fifth triode V5 is grounded.

[0059] In a specific embodiment, the first gate logic device J1 can be an AND gate chip, which cooperates with the tenth resistor R10, the fifth crystal diode D5 and the fourth crystal diode D4 to perform high-level self-locking; the fifth transistor V5 can be an NPN transistor; and the ninth unipolar transistor Q9 can be an N-channel field effect transistor.

[0060] Further, the timing switching module 7 includes a sixth crystal diode D6, a seventh crystal diode D7, a first potentiometer RP1, a second potentiometer RP2, a second capacitor C2, an eleventh resistor R11, a first timer IC1, a third capacitor C3, a twelfth resistor R12, a fourth transistor V4, a fourth capacitor C4 and a first counter IC2;

[0061] Specifically, the fourth terminal and the eighth terminal of the first timer IC1 are connected to the collector of the fourth transistor V4 and the sixteenth terminal of the first counter IC2 and connected to the seventh terminal of the first timer IC1, the cathode of the seventh crystal diode D7, the anode of the sixth crystal diode D6 and the source of the ninth unipolar transistor Q9 through the eleventh resistor R11, the cathode of the sixth crystal diode D6 is connected to one end and the slider end of the first potentiometer RP1, the anode of the seventh crystal diode D7 is connected to one end and the slider end of the second potentiometer RP2, the other end of the first potentiometer RP1 is connected to the other end of the second potentiometer RP2, the sixth terminal and the second terminal of the first timer IC1 and are grounded through the second capacitor C2, and the first timer The fifth terminal of IC1 is grounded through the third capacitor C3, the third terminal of the first timer IC1 is connected to the base of the fourth transistor V4, the emitter of the fourth transistor V4 is connected to the fourteenth terminal of the third counter and one end of the fourth capacitor C4 and is connected to the other end of the fourth capacitor C4, the first terminal of the first timer IC1, the ground terminal, the thirteenth terminal, the fifteenth terminal and the eighth terminal of the first counter IC2 through the twelfth resistor R12, the third terminal and the second terminal of the first counter IC2 are respectively connected to the gate of the third unipolar transistor Q3 and the gate of the sixth unipolar transistor Q6, the fourth terminal of the first counter IC2 is connected to the shunt protection module 8, and the seventh terminal of the first counter IC2 is connected to the base of the fifth transistor V5.

[0062] In a specific embodiment, the first timer IC1 may use the NE555 integrated chip, and cooperate with the sixth crystal diode D6, the seventh crystal diode D7, the first potentiometer RP1, the second potentiometer RP2, the second capacitor C2, the eleventh resistor R11 and the third capacitor C3 to perform cyclic timing work and output a high-level signal in a cyclic timing manner; the counter may use the CD4017 chip, and cooperate with the fourth capacitor C4, the fourth transistor V4 and the twelfth resistor R12 to count the high-level signal output by the first timer IC1, and output the first control signal, the second control signal, the third control signal and the fourth control signal in sequence, wherein the fourth transistor V4 may use an NPN transistor.

[0063] Further, the shunt protection module 8 includes an eighth crystal diode D8, a ninth crystal diode D9, a tenth crystal diode D10, an eleventh crystal diode D11, a second gate logic device J2, a second control device and a third control device;

[0064] Specifically, the anode of the eighth crystal diode D8 is connected to the second end of the first counter IC2, the cathode of the eighth crystal diode D8 is connected to the cathode of the ninth crystal diode D9 and the A end of the first gate logic device J1, the B end of the first gate logic device J1 is connected to the cathode of the tenth crystal diode D10 and the cathode of the eleventh crystal diode D11, the anode of the tenth crystal diode D10 is connected to the anode of the ninth crystal diode D9, the Y end of the first gate logic device J1 and the gate of the second unipolar transistor Q2, the cathode of the eleventh crystal diode D11 is connected to the output end of the voltage comparator A1, the first end of the second control device and the first end of the third control device, the second end and the third end of the second control device are respectively connected to the second end of the first counter IC2 and the gate of the fifth unipolar transistor Q5, and the second end and the third end of the third control device are respectively connected to the fourth end of the first counter IC2 and the gate of the eighth unipolar transistor Q8.

[0065] In a specific embodiment, the second gate logic device J2 can select an AND gate chip to cooperate with the eighth crystal diode D8, the ninth crystal diode D9, the tenth crystal diode D10 and the eleventh crystal diode D11 to perform signal self-locking processing; the circuit composition structure of the second control device is the same as the circuit composition structure of the eighth crystal diode D8, the ninth crystal diode D9, the tenth crystal diode D10, the eleventh crystal diode D11 and the second gate logic device J2; the selection of the third control device is the same as the selection of the second control device.

[0066] An embodiment of the present invention provides a chip, which includes the battery multiple overcurrent protection circuit as described in any of the above embodiments.

[0067] In a battery multiple overcurrent protection circuit of the present embodiment, a power interface is connected to direct current power, a first unipolar transistor Q1 transmits it to the first interface, a fourth unipolar transistor Q4 transmits it to the second interface, and a seventh unipolar transistor Q7 transmits it to the third interface. At this time, the first interface, the second interface and the third interface are connected in series, and the third interface outputs the first detection power. The fourth resistor R4 performs current sampling on the first detection power, and the first operational amplifier OP1 cooperates with the fifth resistor R5, the first capacitor C1, the sixth resistor R6 and the seventh resistor R7 to perform signal conversion, amplification and filtering, and then outputs a voltage signal. When an overcurrent occurs, the voltage signal will be greater than the overcurrent threshold set by the ninth resistor R9 and the eighth resistor R8, and the voltage comparator A1 will output The first gate logic device J1 is at a high level, so that the B end of the first gate logic device J1, the B end of the second gate logic device J2, the first end of the second control device and the first end of the third control device all become high levels. The first gate logic device J1 cooperates with the tenth resistor R10, the fifth crystal diode D5 and the fourth crystal diode D4 to control the ninth unipolar transistor Q9 to turn on. The first timer IC1 and the first counter IC2 are powered on, and the first timer IC1 starts timing work. The first potentiometer RP1 can control the time when the first timer IC1 outputs a signal in a high level state, and the second potentiometer RP2 can control the time when the first timer IC1 outputs a signal in a low level state. When the first timer IC1 outputs a high level for the first time, it will control the fourth transistor V4 is turned on, so that the third terminal of the first counter IC2 outputs a signal in a high-level state, namely, the first control signal, which controls the third unipolar transistor Q3 and the second triode V2 to be turned on, and the A terminal of the second gate logic device J2 becomes a high level. At this time, only the first interface will be detected for overcurrent. When overcurrent occurs, the second gate logic device J2 will control the second unipolar transistor Q2 and the first triode V1 to be turned on, and the first unipolar transistor Q1 is turned off, and the first interface is disconnected from the second interface and the power supply interface. When the first timer IC1 outputs a high-level signal for the second time, the second terminal of the first counter IC2 outputs a high-level signal, namely, the second control signal, which controls the sixth unipolar transistor Q6 and the third triode V3 to be turned on, and the second terminal of the second control device is turned on. The third interface is overcurrent-controlled, and the third terminal of the second control device controls the second triode V2 and the fifth unipolar transistor Q5 to be turned on, and the fourth unipolar transistor Q4 to be turned off. The second interface is disconnected from the first interface and the third interface. Similarly, the fourth terminal of the first counter IC2 outputs a high-level signal, i.e., the third control signal. If the third interface is overcurrent-controlled, the third control device controls the third triode V3 and the eighth unipolar transistor Q8 to be turned on, and the seventh unipolar transistor Q7 to be turned off. The third interface is disconnected from the second interface. The seventh terminal of the first counter IC2 outputs a high-level signal, i.e., the fourth control signal, which controls the fifth triode V5 to be turned on. The first gate logic device J1 stops self-locking, and the timing switching module 7 stops working.The battery interfaces that do not have overcurrent will be connected in series and charged normally.

[0068] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A battery multiple overcurrent protection circuit, characterized in that: The battery multiple overcurrent protection circuit comprises: a power module, a first battery control module, a second battery control module, a third battery control module, a shunt overcurrent detection module, a power supply control module, a timing switching module and a shunt protection module; The power module is used to receive direct current power, stabilize the direct current power and output working power; The first battery control module is connected to the power module, the shunt protection module, the second battery control module and the timing switching module, and is used to transmit direct current power to the connected first battery and control the charging of the first battery, provide first power, stop receiving direct current power and transmit direct current power to the second battery control module when receiving the first protection signal output by the shunt protection module, and output second detection power when receiving the first control signal output by the timing switching module; The second battery control module is connected to the shunt protection module, the third battery control module and the timing switching module, and is used to transmit the first electric energy or DC electric energy to the connected second battery and control the charging of the second battery, provide the second electric energy, and when receiving the second protection signal output by the shunt protection module, stop receiving the first electric energy or DC electric energy and transmitting it to the third battery control module, and when receiving the second control signal output by the timing switching module, output the third detection electric energy; The third battery control module is connected to the shunt protection module and the timing switching module, and is used to transmit the first electric energy, DC electric energy or the second electric energy to the connected third battery and control the charging of the third battery. When receiving the third protection signal output by the shunt protection module, the third battery control module stops receiving the first electric energy, DC electric energy or the second electric energy, and provides the first detection electric energy and the fourth detection electric energy; The branch overcurrent detection module is connected to the power module, the first battery control module, the second battery control module and the third battery control module, and is used to perform current sampling and signal conditioning on the first detection power, the second detection power, the third detection power or the fourth detection power, and output a first level signal when the regulated signal is greater than a set overcurrent threshold; The power supply control module, together with the power supply module, the timing switching module and the branch overcurrent detection module, is used to perform self-locking processing on the first level signal and transmit the working power to the timing switching module when receiving the first level signal, and stop the signal self-locking work when receiving the fourth control signal output by the timing switching module; The timing switching module is used to set the timing time, and when receiving the working power transmitted by the power supply control module, starts the timing work and outputs the first control signal, the second control signal, the third control signal and the fourth control signal in sequence; The shunt protection module is used to self-lock and output the first protection signal when receiving the first control signal and the first level signal, self-lock and output the second protection signal when receiving the second control signal and the first level signal, and self-lock and output the third protection signal when receiving the third control signal and the first level signal.

2. A battery multiple overcurrent protection circuit according to claim 1, characterized in that: The power module includes a power interface; the first battery control module includes a first unipolar transistor, a first resistor, a first triode, a first interface, a second unipolar transistor and a third unipolar transistor; The first end of the power interface is connected to the drain of the second unipolar transistor, the drain of the first unipolar transistor, and the gate of the first unipolar transistor and the collector of the first triode through the first resistor, the source of the first unipolar transistor is connected to the first end of the first interface, the second end of the first interface is connected to the source of the second unipolar transistor, the drain of the third unipolar transistor and the second battery control module, the source of the third unipolar transistor is connected to the shunt overcurrent detection module, the gate of the third unipolar transistor is connected to the shunt protection module, the base of the first triode is connected to the gate of the second unipolar transistor, and the emitter of the first triode is connected to the second end of the power interface and the ground.

3. A battery multiple overcurrent protection circuit according to claim 2, characterized in that: The second battery control module includes a fourth unipolar transistor, a second resistor, a first crystal diode, a second triode, a fifth unipolar transistor, a sixth unipolar transistor and a second interface; The drain of the fourth unipolar transistor is connected to the drain of the fifth unipolar transistor and the second end of the first interface and is connected to the gate of the fourth unipolar transistor and the collector of the second triode through the second resistor, the base of the second triode is connected to the cathode of the first crystal diode and the gate of the fifth unipolar transistor, the anode of the first crystal diode is connected to the gate of the third unipolar transistor, the emitter of the second triode is connected to the second end of the power interface, the source of the fourth unipolar transistor is connected to the first end of the second interface, the second end of the second interface is connected to the source of the fifth unipolar transistor, the drain of the sixth unipolar transistor and the third battery control module, the source of the sixth unipolar transistor is connected to the source of the third unipolar transistor, and the gate of the sixth unipolar transistor is connected to the shunt protection module.

4. A battery multiple overcurrent protection circuit according to claim 3, characterized in that: The third battery control module includes a third resistor, a seventh unipolar transistor, a second crystal diode, a third triode, an eighth unipolar transistor and a third interface; The drain of the seventh unipolar transistor is connected to the second end of the second interface and the drain of the eighth unipolar transistor, and is connected to the gate of the seventh unipolar transistor and the collector of the third triode through the third resistor, the base of the third triode is connected to the cathode of the second crystal diode and the gate of the eighth unipolar transistor, the anode of the second crystal diode is connected to the gate of the sixth unipolar transistor, the emitter of the third triode is grounded, the source of the seventh unipolar transistor is connected to the first end of the third interface, and the second end of the third interface is connected to the source of the eighth unipolar transistor and the source of the sixth unipolar transistor.

5. A battery multiple overcurrent protection circuit according to claim 4, characterized in that: The power supply module also includes a voltage regulator; the shunt overcurrent detection module includes a fourth resistor, a fifth resistor, a first capacitor, a first operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a voltage comparator and a ninth resistor; The input end of the voltage regulator is connected to the first end of the power interface, the second end of the power interface is connected to the inverting end of the voltage comparator and one end of the eighth resistor through the ninth resistor, the non-inverting end of the voltage comparator is connected to the output end of the first operational amplifier and is connected to the inverting end of the first operational amplifier and one end of the sixth resistor through the seventh resistor, the non-inverting end of the first operational amplifier is connected to one end of the first capacitor and is connected to one end of the fourth resistor and the source of the third unipolar transistor through the fifth resistor, the other end of the sixth resistor is connected to the other end of the eighth resistor, the other end of the first capacitor, the other end of the fourth resistor and the second end of the power interface, and the output end of the voltage comparator is connected to the shunt protection module.

6. A battery multiple overcurrent protection circuit according to claim 5, characterized in that: The power supply control module includes a tenth resistor, a fifth triode, a fourth crystal diode, a fifth crystal diode, a first gate logic device and a ninth unipolar transistor; The drain of the ninth unipolar transistor is connected to the output end of the voltage regulator and is connected to the collector of the fifth transistor and the A end of the first gate logic device through the tenth resistor. The B end of the first gate logic device is connected to the cathode of the fifth crystal diode and the cathode of the fourth crystal diode. The anode of the fourth crystal diode is connected to the output end of the voltage comparator. The anode of the fifth crystal diode is connected to the Y end of the first gate logic device and the gate of the ninth unipolar transistor. The source of the ninth unipolar transistor is connected to the timing switching module, and the emitter of the fifth transistor is grounded.

7. A battery multiple overcurrent protection circuit according to claim 6, characterized in that: The timing switching module includes a sixth crystal diode, a seventh crystal diode, a first potentiometer, a second potentiometer, a second capacitor, an eleventh resistor, a first timer, a third capacitor, a twelfth resistor, a fourth triode, a fourth capacitor and a first counter; The fourth end and the eighth end of the first timer are connected to the collector of the fourth triode and the sixteenth end of the first counter, and are connected to the seventh end of the first timer, the cathode of the seventh crystal diode, the anode of the sixth crystal diode and the source of the ninth unipolar transistor through the eleventh resistor, the cathode of the sixth crystal diode is connected to one end of the first potentiometer and the slider end, the anode of the seventh crystal diode is connected to one end of the second potentiometer and the slider end, the other end of the first potentiometer is connected to the other end of the second potentiometer, the sixth end and the second end of the first timer and are grounded through the second capacitor, the fifth end of the first timer is grounded through the third capacitor, the third end of the first timer is connected to the base of the fourth triode, the emitter of the fourth triode is connected to the fourteenth end of the counter and one end of the fourth capacitor and is connected to the other end of the fourth capacitor, the first end of the first timer, the ground end, the thirteenth end, the fifteenth end and the eighth end of the first counter through the twelfth resistor, the third end and the second end of the first counter are respectively connected to the gate of the third unipolar transistor and the gate of the sixth unipolar transistor, the fourth end of the first counter is connected to the shunt protection module, and the seventh end of the first counter is connected to the base of the fifth triode.

8. A battery multiple overcurrent protection circuit according to claim 7, characterized in that: The shunt protection module includes an eighth crystal diode, a ninth crystal diode, a tenth crystal diode, an eleventh crystal diode, a second gate logic device, a second control device and a third control device; The anode of the eighth crystal diode is connected to the second end of the first counter, the cathode of the eighth crystal diode is connected to the cathode of the ninth crystal diode and the A end of the first gate logic device, the B end of the first gate logic device is connected to the cathode of the tenth crystal diode and the cathode of the eleventh crystal diode, the anode of the tenth crystal diode is connected to the anode of the ninth crystal diode, the Y end of the first gate logic device and the gate of the second unipolar transistor, the cathode of the eleventh crystal diode is connected to the output end of the voltage comparator, the first end of the second control device and the first end of the third control device, the second end and the third end of the second control device are respectively connected to the second end of the first counter and the gate of the fifth unipolar transistor, and the second end and the third end of the third control device are respectively connected to the fourth end of the first counter and the gate of the eighth unipolar transistor.

9. A chip, characterized in that: The chip includes the battery multiple over-current protection circuit according to any one of claims 1 to 8.

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