CN207490496U - Li battery protection IC, protection circuit and electronic equipment - Google Patents
Li battery protection IC, protection circuit and electronic equipment Download PDFInfo
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- CN207490496U CN207490496U CN201721647438.4U CN201721647438U CN207490496U CN 207490496 U CN207490496 U CN 207490496U CN 201721647438 U CN201721647438 U CN 201721647438U CN 207490496 U CN207490496 U CN 207490496U
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Abstract
The utility model discloses a kind of Li battery protection IC, protection circuit and electronic equipment; including detection module, compensating module and control module; the compensating module is connect with the detection module; the detection module is connect with control module; the detection module obtains the working condition of external circuit and the Regulate signal of the compensating module is sent to the control module, the connection or closing of signal control external circuit that the control module is sent according to the detection module.The Li battery protection IC and circuit of the utility model add compensating module by portion in the chip, adjust the signal waveform of detection module, so as to make the accuracy of detection of detection module more accurate, improve the safety in utilization and service life of lithium battery；Diode can also be added, the similarity of signal waveform is improved using the C-V characteristic of diode, so as to further improve the accuracy of detection of detection module；When there is constant pressure source, the waveform and bending direction of the contrast signal that compensating module exports constant pressure source are adjusted and are sent to detection module, so as to improve the accuracy of detection of detection module, enhance the safety in utilization of lithium battery.
Description
Technical field
The utility model is related to arrive lithium ion battery protection integrated circuit fields, a kind of li-ion cell protection is especially related to
Chip, protection circuit and electronic equipment.
Background technology
The protection scheme of existing lithium battery is typically to be combined IC chip and MOS transistor, that is, utilizes IC chip
VM Port detectings voltage realizes overcurrent protection.
The protected mode of such VM Port detecting voltages by IC chip is there is defect, since MOS transistor is open-minded
When, the conducting internal resistance Ron of MOS transistor changes with battery core voltage change, and overcurrent value also can be due to the difference of battery core voltage
Difference, i.e., there are overcurrent value range it is wide the problem of.For another example, during high current continuous discharge, it is contemplated that temperature can increase, conducting
Internal resistance Ron can select the MOS transistor of resistance value very little, while the over-current detection voltage of IC chip can also select to obtain very little, electric conduction
The very big variation that the slight change of resistance Ron will lead to overcurrent value, is susceptible to wrong report situation.
In addition, the mainstream protection scheme for solving problem above at present is to increase accurate electricity in IC chip and MOS transistor
Resistance, and IC chip realizes overcurrent protection by detecting the voltage of precision resistance, the internal resistance of cell is caused to increase, consumable becomes larger, cost
Go up, while precision resistance needs to be placed in main circuit, big by electric current, calorific value is big, and eventually leads to and be not integrated into IC
Chip interior.
Utility model content
The utility model provides a kind of Li battery protection IC, protection circuit and electronic equipment, overcomes lithium battery guarantor
The problem of overcurrent value detection precision is low in protection circuit.
To achieve the above object, the utility model proposes a kind of Li battery protection IC, including detection module, compensating module
And control module.
Above-mentioned compensating module is connect with above-mentioned detection module, and above-mentioned detection module is connect with control module, above-mentioned detection mould
Block obtains the working condition of external circuit and the Regulate signal of above-mentioned compensating module is sent to above-mentioned control module, above-mentioned control mould
The connection or closing of signal control external circuit that root tuber is sent according to above-mentioned detection module.
Further, in above-mentioned Li battery protection IC, above-mentioned detection module includes charging detection sub-module and electric discharge
Detection sub-module, above-mentioned compensating module include charging compensation submodule and discharging compensation submodule, and above-mentioned charging compensates submodule
It is connect with above-mentioned charging detection sub-module, above-mentioned charging detection sub-module is connect with above-mentioned Control architecture, above-mentioned charging detection
Module obtains the working condition of external circuit and the Regulate signal of above-mentioned charging compensation submodule is sent to above-mentioned control module, on
State the connection or closing of signal control external circuit that control module is sent according to above-mentioned charging detection sub-module；Above-mentioned electric discharge is mended
It repays submodule to connect with above-mentioned discharge examination submodule, above-mentioned discharge examination submodule is connect with above-mentioned Control architecture, above-mentioned to put
Electro-detection submodule obtains the working condition of external circuit and the Regulate signal of above-mentioned discharging compensation submodule is sent to above-mentioned control
Molding block, the connection or closing of signal control external circuit that above-mentioned control module is sent according to above-mentioned discharge examination submodule.
Further, in above-mentioned Li battery protection IC, which is characterized in that including charging constant pressure source and electric discharge constant pressure
Source, above-mentioned charging constant pressure source are connect with above-mentioned charging compensation submodule, and it is supreme that above-mentioned charging constant pressure source sends reference voltage signal
State charging compensation submodule；Above-mentioned electric discharge constant pressure source is connect with above-mentioned discharging compensation submodule, and above-mentioned electric discharge constant pressure source sends ginseng
According to voltage signal to above-mentioned discharging compensation submodule.
Further, in above-mentioned Li battery protection IC, above-mentioned discharging compensation submodule include resistance R1, resistance R2,
Resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, it is above-mentioned
One end of resistance R3 is connect with the in-phase input end of above-mentioned voltage follower LM1A, and the other end of above-mentioned resistance R3 is connected to above-mentioned
Between one end of resistance R4 and above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to
It states between the positive power source terminal of LM1A and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, above-mentioned voltage follower
Negative power end connect with ground wire, one end of above-mentioned resistance R2 is connected to one end of above-mentioned resistance R1 and above-mentioned voltage follower
Between the inverting input of LM1A, the other end of above-mentioned resistance R2 is connect with constant pressure source, the above-mentioned voltage of above-mentioned resistance Rf1 connections with
With between the inverting input and output terminal of device LM1A, the other end of above-mentioned resistance R1 is connected to one end of above-mentioned resistance R6 and upper
Between the one end for stating resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, the other end and ground wire of above-mentioned resistance R7
Connection, the output terminal of above-mentioned voltage follower LM1A are connect with above-mentioned discharge examination submodule.
Further, in above-mentioned Li battery protection IC, above-mentioned discharging compensation submodule include resistance R1, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, above-mentioned resistance R3's
One end is connect with the in-phase input end of above-mentioned voltage follower LM1A, and the other end of above-mentioned resistance R3 is connected to above-mentioned resistance R4's
Between one end and above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to above-mentioned LM1A's
Between positive power source terminal and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, the negative supply of above-mentioned voltage follower
End is connect with ground wire, and one end of above-mentioned resistance R1 is connected with the inverting input of above-mentioned voltage follower LM1A, above-mentioned resistance Rf1
Between the inverting input and output terminal that connect above-mentioned voltage follower LM1A, the other end of above-mentioned resistance R1 is connected to above-mentioned electricity
It hinders between one end of R6 and one end of above-mentioned resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, above-mentioned resistance R7
The other end connect with ground wire, the output terminal of above-mentioned voltage follower LM1A is connect with above-mentioned discharge examination submodule.
Further, in above-mentioned Li battery protection IC, above-mentioned discharging compensation submodule include resistance R1, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance Rf1, diode D1, compensation power supply B1 and voltage follower
LM1A, one end of above-mentioned resistance R3 are connect with the in-phase input end of above-mentioned voltage follower LM1A, the other end of above-mentioned resistance R3
It is connected between one end of above-mentioned resistance R4 and above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and above-mentioned resistance R4's is another
End is connected between the positive power source terminal of above-mentioned LM1A and above-mentioned compensation power supply B1, and above-mentioned compensation power supply B1 is connected with ground wire, above-mentioned
The negative power end of voltage follower is connect with ground wire, the anti-phase input of one end of above-mentioned resistance R1 and above-mentioned voltage follower LM1A
End connection, between the inverting input and output terminal of the above-mentioned above-mentioned voltage follower LM1A of resistance Rf1 connections, above-mentioned resistance R1's
The other end is connected between one end of above-mentioned resistance R6 and one end of above-mentioned resistance R7, the other end and external electrical of above-mentioned resistance R6
Road connects, and the other end of above-mentioned resistance R7 is connect with ground wire, and above-mentioned diode D1 is connected to the defeated of above-mentioned voltage follower LM1A
Between outlet and above-mentioned resistance R8, above-mentioned resistance R8 is connect with above-mentioned discharge examination submodule.
The utility model proposes a kind of lithium battery protection circuit, the Li battery protection IC including above-mentioned any one is protected
Shield switch, lithium battery B2, above-mentioned lithium battery B2 are connect with above-mentioned protection chip, above-mentioned protection switch and above-mentioned protection chip company
It connects, above-mentioned lithium battery B2 is connected with above-mentioned protection switch.
Further, in above-mentioned lithium battery protection circuit, above-mentioned protection switch include charging protection switch metal-oxide-semiconductor Q1 and
The anode of discharge protection switch metal-oxide-semiconductor Q2, above-mentioned lithium battery B2 are connect with foregoing circuit anode EB+, and above-mentioned lithium battery B2's is negative
Pole is connect with the source electrode of above-mentioned metal-oxide-semiconductor Q1, and the drain electrode of above-mentioned metal-oxide-semiconductor Q1 is connect with the drain electrode of above-mentioned metal-oxide-semiconductor Q2, above-mentioned metal-oxide-semiconductor
The source electrode of Q2 is connect with foregoing circuit cathode EB-, and the grid of above-mentioned metal-oxide-semiconductor Q1 is connect with above-mentioned Li battery protection IC, above-mentioned
The grid of metal-oxide-semiconductor Q2 is connect with above-mentioned Li battery protection IC.
The utility model proposes a kind of lithium battery electronic equipment, Li battery protection IC including above-mentioned any one and
The lithium battery protection circuit of above-mentioned any one.
The Li battery protection IC and circuit of the utility model add compensating module by portion in the chip, adjust detection
The signal waveform of module so as to make the accuracy of detection of detection module more accurate, improves safety in utilization and the use of lithium battery
Service life；Diode can also be added, the similarity of signal waveform is improved using the C-V characteristic of diode, so as to further carry
The accuracy of detection of high detection module；When there is constant pressure source, the waveform for the contrast signal that compensating module exports constant pressure source and bending
Direction is adjusted and is sent to detection module, so as to improve the accuracy of detection of detection module, enhances the safe to use of lithium battery
Property.
Description of the drawings
Fig. 1 is the structure diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 2 is the structure diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 3 is the structure diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 4 is the circuit connection diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 5 is the circuit connection diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 6 is the circuit connection diagram of the Li battery protection IC of one embodiment of the utility model；
Fig. 7 is the connection diagram of the lithium battery protection circuit of one embodiment of the utility model.
1st, compensating module；2nd, detection module；3rd, control module；4th, external circuit；5th, charge constant pressure source；6th, electric discharge constant pressure
Source；7th, charging compensation submodule；8th, discharging compensation submodule；9th, charge detection sub-module；10th, discharge examination submodule.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that described embodiment is only the part of the embodiment rather than whole of the utility model
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, shall fall within the protection scope of the present invention.
In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, and this technical side is will be understood that when the combination appearance of technical solution is conflicting or can not realize
The combination of case is not present, also not within the protection domain of the requires of the utility model.
With reference to Fig. 1, the Li battery protection IC of one embodiment of the utility model is proposed, including detection module 2, compensating module
1 and control module 3, above-mentioned compensating module 1 connect with above-mentioned detection module 2, above-mentioned detection module 2 is connect with control module 3,
Above-mentioned detection module 2 obtains the working condition of external circuit 4 and the Regulate signal of above-mentioned compensating module 1 is sent to above-mentioned control mould
Block 3, the connection or closing of signal control external circuit 4 that above-mentioned control module 3 is sent according to above-mentioned detection module 2.
Above-mentioned compensating module 1 sends thermal compensation signal to above-mentioned detection module 2 to adjust the inspection transmitted by above-mentioned detection module 2
The waveform and bending direction of signal (including first detection signal and the second detection signal) are surveyed, makes what above-mentioned detection module 2 was sent
Detect signal signal waveform and bending direction closer to the processing waveform of above-mentioned control module 3, make the error of detection signal
Smaller improves the detection precision of above-mentioned Li battery protection IC.
When external circuit 4 is in charged state, above-mentioned detection module 2 obtains the real-time voltage parameter of external circuit 4, and
First detection signal is formed according to the thermal compensation signal that above-mentioned compensating module is sent, above-mentioned control module 3 is believed according to first detection
The break-make of number control external circuit, when other than the first detection signal be in specified threshold, above-mentioned control module 3 sends closing
Signal cuts off external circuit 4, and when first detection signal is restored to specified threshold, above-mentioned control module 3, which is sent, opens letter
Number, external circuit 4 is connected.
When external circuit 4 is in discharge condition, above-mentioned detection module 2 obtains the real-time voltage parameter of external circuit 4, and
Second detection signal is formed according to the thermal compensation signal that above-mentioned compensating module is sent, above-mentioned control module 3 is believed according to second detection
The break-make of number control external circuit, when the second detection signal be in other than specified threshold, above-mentioned control module 3 sends closing
Signal cuts off external circuit 4, and when the second detection signal restores to specified threshold, above-mentioned Control architecture 3, which is sent, opens letter
Number, external circuit 4 is connected.
With reference to Fig. 2, in the present embodiment, above-mentioned detection module 2 includes charging detection sub-module 9 and discharge examination submodule
10, above-mentioned compensating module 1 includes charging compensation submodule 7 and discharging compensation submodule 8, above-mentioned charging compensation submodule 7 with it is upper
It states charging detection sub-module 9 to connect, above-mentioned charging detection sub-module 9 is connect with above-mentioned Control architecture 3, and above-mentioned charging detects submodule
Block 9 obtains the working condition of external circuit 4 and the Regulate signal of above-mentioned charging compensation submodule 7 is sent to above-mentioned control module 3,
The connection or closing of signal control external circuit 4 that above-mentioned control module 3 is sent according to above-mentioned charging detection sub-module 9；It is above-mentioned
Discharging compensation submodule 8 is connect with above-mentioned discharge examination submodule 10, above-mentioned discharge examination submodule 10 and above-mentioned Control architecture 3
Connection, above-mentioned discharge examination submodule 10 obtain the working condition of external circuit 4 and the adjusting letter of above-mentioned discharging compensation submodule 8
Above-mentioned control module 3 number is sent to, above-mentioned control module 3 controls external according to the signal that above-mentioned discharge examination submodule 10 is sent
The connection or closing of circuit 4.
When external circuit 4 is in charged state, above-mentioned charging detection sub-module 9 obtains the real-time voltage of external circuit 4
Parameter, and first detection signal, above-mentioned control module 3 are formed according to the thermal compensation signal that above-mentioned charging compensation submodule 7 is sent
According to the break-make of first detection signal control external circuit, when other than the first detection signal is in specified threshold, above-mentioned control
Molding block 3 sends shutdown signal, and external circuit 4 is cut off, when first detection signal is restored to specified threshold, above-mentioned control
Module 3 sends opening signal, and external circuit 4 is connected.
When external circuit 4 is in discharge condition, above-mentioned discharge examination submodule 10 obtains the real-time voltage of external circuit 4
Parameter, and the second detection signal, above-mentioned control module 3 are formed according to the thermal compensation signal that above-mentioned discharging compensation submodule 8 is sent
According to the break-make of the second detection signal control external circuit, when the second detection signal is in other than specified threshold, above-mentioned control
Molding block 3 sends shutdown signal, and external circuit 4 is cut off, when the second detection signal restores to specified threshold, above-mentioned control
Template 3 sends opening signal, and external circuit 4 is connected.
With reference to Fig. 3, in the present embodiment, above-mentioned Li battery protection IC includes charging constant pressure source and electric discharge constant pressure source, on
It states charging constant pressure source 5 and above-mentioned charging compensation submodule 7 to connect, the above-mentioned transmission reference voltage signal of charging constant pressure source 5 is to above-mentioned
Charging compensation submodule 7；Above-mentioned electric discharge constant pressure source 6 is connect with above-mentioned discharging compensation submodule 8, and above-mentioned electric discharge constant pressure source 6 is sent
Reference voltage signal is to above-mentioned discharging compensation submodule 8.
With reference to Fig. 4, in specific embodiment one, above-mentioned discharging compensation submodule 8 include resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, above-mentioned resistance R3's
One end is connect with the in-phase input end of above-mentioned voltage follower LM1A, and the other end of above-mentioned resistance R3 is connected to above-mentioned resistance R4's
Between one end and above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to above-mentioned LM1A's
Between positive power source terminal and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, the negative supply of above-mentioned voltage follower
End is connect with ground wire, and one end of above-mentioned resistance R2 is connected to one end of above-mentioned resistance R1 and the reverse phase of above-mentioned voltage follower LM1A
Between input terminal, the other end of above-mentioned resistance R2 is connect with electric discharge constant pressure source, the above-mentioned voltage follower of above-mentioned resistance Rf1 connections
Between the inverting input and output terminal of LM1A, the other end of above-mentioned resistance R1 is connected to one end of above-mentioned resistance R6 and above-mentioned electricity
Between the one end for hindering R7, the other end of above-mentioned resistance R6 is connect with external circuit, and the other end of above-mentioned resistance R7 is connect with ground wire,
The output terminal of above-mentioned voltage follower LM1A is connect with above-mentioned discharge examination submodule 10.
Wherein, above-mentioned resistance R1, above-mentioned resistance R2 are identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and upper
State the reference that resistance R5 resistance values are identical, and above-mentioned discharging compensation submodule 8 exports above-mentioned electric discharge constant pressure source 6 according to the following formula
The waveform and bending direction of signal be adjusted and send it is supreme state discharge examination submodule 10, to improve above-mentioned discharge examination
The accuracy of detection of module 10.
Uout0=- ((Rf1/R1) * (U0-U2)+(Rf1/R2) * (Uic-U2))
In above-mentioned formula, Uic is protection chip over-current detection voltage, and Uout0 is discharging compensation submodule output end voltage,
Voltages of the U0 between above-mentioned resistance R6 and above-mentioned resistance R7, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
In specific embodiment one, above-mentioned charging compensation submodule 7 include resistance R1, resistance R2, resistance R3, resistance R4,
Resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, one end of above-mentioned resistance R3 with
The in-phase input end connection of above-mentioned voltage follower LM1A, the other end of above-mentioned resistance R3 be connected to above-mentioned resistance R4 one end and
Between above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to the positive supply of above-mentioned LM1A
Between end and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, negative power end and the ground of above-mentioned voltage follower
Line connects, and one end of above-mentioned resistance R2 is connected to one end of above-mentioned resistance R1 and the inverting input of above-mentioned voltage follower LM1A
Between, the other end of above-mentioned resistance R2 is connect with electric discharge constant pressure source, and the above-mentioned above-mentioned voltage follower LM1A's of resistance Rf1 connections is anti-
Between phase input terminal and output terminal, the other end of above-mentioned resistance R1 be connected to above-mentioned resistance R6 one end and above-mentioned resistance R7 one
Between end, the other end of above-mentioned resistance R6 is connect with external circuit, and the other end of above-mentioned resistance R7 is connect with ground wire, above-mentioned voltage
The output terminal of follower LM1A is connect with above-mentioned charging detection sub-module 9.
Wherein, above-mentioned resistance R1, above-mentioned resistance R2 are identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and upper
State the reference that resistance R5 resistance values are identical, and above-mentioned charging compensation submodule 7 exports above-mentioned charging constant pressure source 5 according to the following formula
The waveform and bending direction of signal be adjusted and send it is supreme state charging detection sub-module 7, to improve above-mentioned charging detection mould
The accuracy of detection of block 7.
Uout0=- ((Rf1/R1) * (U0-U2)+(Rf1/R2) * (Uic-U2))
In above-mentioned formula, Uic is protection chip over-current detection voltage, and Uout0 is charging compensation submodule output end voltage,
Voltages of the U0 between above-mentioned resistance R6 and above-mentioned resistance R7, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
With reference to Fig. 5, in specific embodiment two, above-mentioned discharging compensation submodule 8 include resistance R1, resistance R3, resistance R4,
Resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, one end of above-mentioned resistance R3 with
The in-phase input end connection of above-mentioned voltage follower LM1A, the other end of above-mentioned resistance R3 be connected to above-mentioned resistance R4 one end and
Between above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to the positive supply of above-mentioned LM1A
Between end and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, negative power end and the ground of above-mentioned voltage follower
Line connects, and one end of above-mentioned resistance R1 is connected with the inverting input of above-mentioned voltage follower LM1A, in above-mentioned resistance Rf1 connections
Between the inverting input and output terminal of stating voltage follower LM1A, the other end of above-mentioned resistance R1 is connected to above-mentioned resistance R6's
Between one end and one end of above-mentioned resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, and above-mentioned resistance R7's is another
End is connect with ground wire, and the output terminal of above-mentioned voltage follower LM1A is connect with above-mentioned discharge examination submodule 10.
Wherein, above-mentioned resistance R1 is identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and above-mentioned resistance R5 resistance
Be worth the contrast signal identical, above-mentioned discharging compensation submodule 8 exports above-mentioned electric discharge constant pressure source 6 according to the following formula waveform and
Bending direction be adjusted and send it is supreme state discharge examination submodule 10, to improve the detection of above-mentioned discharge examination submodule 10
Precision.
Uout0=- ((Rf1/R1) * (U0-U2)
In above-mentioned formula, Uout0 is discharging compensation submodule output end voltage, and U0 is above-mentioned resistance R6 and above-mentioned resistance R7
Between voltage, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
In specific embodiment two, above-mentioned charging compensation submodule 7 include resistance R1, resistance R3, resistance R4, resistance R5,
Resistance R6, resistance R7, resistance Rf1, the one end for compensating power supply B1 and voltage follower LM1A, above-mentioned resistance R3 and above-mentioned voltage
The in-phase input end connection of follower LM1A, the other end of above-mentioned resistance R3 are connected to one end of above-mentioned resistance R4 and above-mentioned resistance
Between R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to the positive power source terminal of above-mentioned LM1A and above-mentioned
Between compensating power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, and the negative power end of above-mentioned voltage follower is connect with ground wire, on
The one end for stating resistance R1 is connected with the inverting input of above-mentioned voltage follower LM1A, the above-mentioned voltage of above-mentioned resistance Rf1 connections with
With between the inverting input and output terminal of device LM1A, the other end of above-mentioned resistance R1 is connected to one end of above-mentioned resistance R6 and upper
Between the one end for stating resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, the other end and ground wire of above-mentioned resistance R7
Connection, the output terminal of above-mentioned voltage follower LM1A are connect with above-mentioned charging detection sub-module 9.
Wherein, above-mentioned resistance R1 is identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and above-mentioned resistance R5 resistance
Be worth the contrast signal identical, above-mentioned charging compensation submodule 7 exports above-mentioned charging constant pressure source 5 according to the following formula waveform and
Bending direction be adjusted and send it is supreme state charging detection sub-module 9, with improve the detection of above-mentioned charging detection sub-module 9 essence
Degree.
Uout0=- ((Rf1/R1) * (U0-U2)
In above-mentioned formula, Uout0 is charging compensation submodule output end voltage, and U0 is above-mentioned resistance R6 and above-mentioned resistance R7
Between voltage, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
Above-mentioned specific embodiment two can also be deformed by adding above-mentioned diode D1 and above-mentioned resistance R8, formed and become
Shape example one.
With reference to Fig. 6, in variation one, above-mentioned discharging compensation submodule 8 includes resistance R1, resistance R3, resistance R4, resistance
R5, resistance R6, resistance R7, resistance R8, resistance Rf1, diode D1, compensation power supply B1 and voltage follower LM1A, above-mentioned electricity
One end of resistance R3 is connect with the in-phase input end of above-mentioned voltage follower LM1A, and the other end of above-mentioned resistance R3 is connected to above-mentioned electricity
Between the one end and the above-mentioned resistance R5 that hinder R4, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is connected to above-mentioned
Between the positive power source terminal of LM1A and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, above-mentioned voltage follower
Negative power end is connect with ground wire, and one end of above-mentioned resistance R1 is connected with the inverting input of above-mentioned voltage follower LM1A, above-mentioned
Between the inverting input and output terminal of the above-mentioned voltage follower LM1A of resistance Rf1 connections, the other end connection of above-mentioned resistance R1
Between one end of above-mentioned resistance R6 and one end of above-mentioned resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, on
The other end for stating resistance R7 is connect with ground wire, and above-mentioned diode D1 is connected to the output terminal of above-mentioned voltage follower LM1A and above-mentioned
Between resistance R8, above-mentioned resistance R8 is connect with above-mentioned discharge examination submodule 10.
Wherein, above-mentioned resistance R1 is identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and above-mentioned resistance R5 resistance
Be worth the contrast signal identical, above-mentioned discharging compensation submodule 8 exports above-mentioned electric discharge constant pressure source 6 according to the following formula waveform and
Bending direction be adjusted and send it is supreme state discharge examination submodule 10, to improve the detection of above-mentioned discharge examination submodule 10
Precision.Above-mentioned diode D1 and above-mentioned resistance R8 are added simultaneously, the inspection of above-mentioned discharge examination submodule 10 can be further improved
Survey precision.
Uout0=- ((Rf1/R1) * (U0-U2)
In above-mentioned formula, Uout0 is discharging compensation submodule output end voltage, and U0 is above-mentioned resistance R6 and above-mentioned resistance R7
Between voltage, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
In variation one, above-mentioned charging compensation submodule 7 includes resistance R1, resistance R3, resistance R4, resistance R5, resistance
R6, resistance R7, resistance R8, resistance Rf1, diode D1, compensation power supply B1 and voltage follower LM1A, the one of above-mentioned resistance R3
End is connect with the in-phase input end of above-mentioned voltage follower LM1A, and the other end of above-mentioned resistance R3 is connected to the one of above-mentioned resistance R4
Between end and above-mentioned resistance R5, above-mentioned resistance R5 is connect with ground wire, and the other end of above-mentioned resistance R4 is being connected to above-mentioned LM1A just
Between power end and above-mentioned compensation power supply B1, above-mentioned compensation power supply B1 is connected with ground wire, the negative power end of above-mentioned voltage follower
It is connect with ground wire, one end of above-mentioned resistance R1 is connected with the inverting input of above-mentioned voltage follower LM1A, and above-mentioned resistance Rf1 connects
Between the inverting input and output terminal that meet above-mentioned voltage follower LM1A, the other end of above-mentioned resistance R1 is connected to above-mentioned resistance
Between one end of R6 and one end of above-mentioned resistance R7, the other end of above-mentioned resistance R6 is connect with external circuit, above-mentioned resistance R7's
The other end is connect with ground wire, above-mentioned diode D1 be connected to above-mentioned voltage follower LM1A output terminal and above-mentioned resistance R8 it
Between, above-mentioned resistance R8 is connect with above-mentioned charging detection sub-module 9.
Wherein, above-mentioned resistance R1 is identical with the resistance value of above-mentioned resistance Rf1, and above-mentioned resistance R4 and above-mentioned resistance R5 resistance
Be worth the contrast signal identical, above-mentioned charging compensation submodule 7 exports above-mentioned charging constant pressure source 5 according to the following formula waveform and
Bending direction be adjusted and send it is supreme state charging detection sub-module 9, with improve the detection of above-mentioned charging detection sub-module 9 essence
Degree.Above-mentioned diode D1 and above-mentioned resistance R8 are added simultaneously, the detection essence of above-mentioned charging detection sub-module 9 can be further improved
Degree.
Uout0=- ((Rf1/R1) * (U0-U2)
In above-mentioned formula, Uout0 is charging compensation submodule output end voltage, and U0 is above-mentioned resistance R6 and above-mentioned resistance R7
Between voltage, voltages of the U2 between above-mentioned resistance R4 and above-mentioned resistance R5.
In above-mentioned variation one, above-mentioned diode, which can also be replaced by, possesses any suitable of C-V characteristic forward or backwards
Element.
With reference to Fig. 7, in specific embodiment three, above-mentioned Li battery protection IC include DO ports, CO ports, vdd terminal mouth,
VSS ports and VM ports, above-mentioned control module 3 are connect by above-mentioned DO ports and above-mentioned CO ports with said external circuit 4, on
It states detection module 2 and above-mentioned control module 3 and passes through above-mentioned vdd terminal mouth, above-mentioned VSS ports and above-mentioned VM ports and external circuit 4
Connection, above-mentioned detection module 2 are connect by above-mentioned vdd terminal mouth, above-mentioned VSS ports and above-mentioned VM ports with said external circuit 4,
Above-mentioned vdd terminal mouth is positive supply input terminal, and above-mentioned VSS ports are negative supply input terminals, and above-mentioned VM ports are voltage detecting ends, on
It states protection chip and voltage difference between above-mentioned vdd terminal mouth and above-mentioned VSS ports and above-mentioned VM ports and above-mentioned is connected to by monitoring
Voltage difference between VSS ports and control external circuit 4.
When above-mentioned lithium battery protection circuit has the phenomenon that electric discharge overcurrent, above-mentioned control module 3 is broken by above-mentioned DO ports
Said external circuit 4 is opened, said external circuit 4 is made to terminate electric discharge, so as to play electric discharge overcurrent to above-mentioned lithium battery protection circuit
Protective effect, when said external circuit 4 restores to normal operating conditions, above-mentioned control module 3 is started above-mentioned by DO ports
External circuit 4 makes said external circuit 4 that can discharge.
When above-mentioned lithium battery protection circuit has the phenomenon that charging overcurrent, above-mentioned control module 3 is broken by above-mentioned CO ports
Said external circuit 4 is opened, said external circuit 4 is made to terminate charging, so as to play charging overcurrent to above-mentioned lithium battery protection circuit
Protective effect, when said external circuit 4 restores to normal operating conditions, above-mentioned control module 3 is started above-mentioned by CO ports
External circuit 4 makes said external circuit 4 that can charge.
With reference to Fig. 7, the lithium battery protection circuit of one embodiment of the utility model is proposed, including lithium battery B2, protection switch
And protection chip, above-mentioned lithium battery B2 are connect with above-mentioned protection chip, above-mentioned protection switch is connected with above-mentioned protection chip, on
Lithium battery B2 is stated to connect with above-mentioned protection switch.
In the present embodiment, above-mentioned protection switch includes charging protection switch metal-oxide-semiconductor Q1 and discharge protection switch metal-oxide-semiconductor
The anode of Q2, above-mentioned lithium battery B2 are connect with foregoing circuit anode EB+, and the cathode of above-mentioned lithium battery B2 is with above-mentioned metal-oxide-semiconductor Q1's
Source electrode connects, and the drain electrode of above-mentioned metal-oxide-semiconductor Q1 is connect with the drain electrode of above-mentioned metal-oxide-semiconductor Q2, the source electrode and foregoing circuit of above-mentioned metal-oxide-semiconductor Q2
Cathode EB- connections, the grid of above-mentioned metal-oxide-semiconductor Q1 are connect with above-mentioned Li battery protection IC, the grid of above-mentioned metal-oxide-semiconductor Q2 with it is above-mentioned
Li battery protection IC connects.
Above-mentioned resistance Ron is the sum of conducting internal resistance of above-mentioned metal-oxide-semiconductor Q1 and above-mentioned metal-oxide-semiconductor Q2, and electric current is formed on metal-oxide-semiconductor
Conduction voltage drop for U, above-mentioned compensating module 2 adjusts the voltage Uic that above-mentioned constant pressure source 1 exports, and sends and supreme state detection module
4, above-mentioned control module 4 carries out size comparison according to the voltage value that above-mentioned detection module 3 is sent and turn-on voltage, exports low electricity
It is flat to close metal-oxide-semiconductor, that is, start overcurrent protection.
With reference to Fig. 7, in specific embodiment four, above-mentioned metal-oxide-semiconductor Q1 is connect with above-mentioned DO ports, above-mentioned metal-oxide-semiconductor Q2 with it is upper
State the connection of CO ports.
When above-mentioned lithium battery protection circuit has the phenomenon that electric discharge overcurrent, above-mentioned control module 3 is broken by above-mentioned DO ports
Above-mentioned metal-oxide-semiconductor Q1 is opened, said external circuit 4 is made to terminate electric discharge, is protected so as to play electric discharge overcurrent to above-mentioned lithium battery protection circuit
Shield acts on, and when said external circuit 4 restores to normal operating conditions, above-mentioned control module 3 starts metal-oxide-semiconductor by DO ports
Q1 makes said external circuit 4 that can discharge.
When above-mentioned lithium battery protection circuit has the phenomenon that charging overcurrent, above-mentioned control module 3 is broken by above-mentioned CO ports
Above-mentioned metal-oxide-semiconductor Q2 is opened, said external circuit 4 is made to terminate charging, is protected so as to play charging overcurrent to above-mentioned lithium battery protection circuit
Shield acts on, and when said external circuit 4 restores to normal operating conditions, above-mentioned control module 3 starts above-mentioned MOS by CO ports
Pipe Q2 makes said external circuit 4 that can charge.
The lithium battery electronic equipment of the utility model, the Li battery protection IC including above-mentioned any one and above-mentioned
One above-mentioned lithium battery protection circuit of meaning.
It is standby that above-mentioned lithium battery electronic equipment generally comprises mobile phone, laptop, intelligent wearable device, electric vehicle, street lamp
With power supply, boat lamp, the electronic equipments such as household electrical appliance, occur after further including with lithium battery or similar to lithium battery discharge principle
Power supply be working power any electronic equipment.
The Li battery protection IC and circuit of the utility model add above-mentioned compensating module 1 by portion in the chip, adjust
The signal waveform of above-mentioned detection module 2 so as to make the accuracy of detection of above-mentioned detection module 2 more accurate, improves making for lithium battery
With safety and service life；Above-mentioned diode D1 can also be added, letter is improved using the C-V characteristic of above-mentioned diode D1
The similarity of number waveform, so as to further improve the accuracy of detection of above-mentioned detection module 2；When there is constant pressure source, above-mentioned compensation mould
The waveform and bending direction for the contrast signal that block 1 exports constant pressure source be adjusted and send it is supreme state detection module 2, so as to carry
The accuracy of detection of high above-mentioned detection module 2 enhances the safety in utilization of lithium battery.
The Li battery protection IC of the utility model protects the protection object of circuit and electronic equipment in addition to lithium battery,
Protection object may be replaced by any battery similar with lithium battery operation principle.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention,
Every equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly transported
Used in other related technical areas, it is equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of Li battery protection IC, which is characterized in that including detection module, compensating module and control module,
The compensating module is connect with the detection module, and the detection module is connect with control module, and the detection module obtains
The working condition of external circuit and the Regulate signal of the compensating module is taken to be sent to the control module, the control module root
The connection or closing of signal control external circuit sent according to the detection module.
2. Li battery protection IC according to claim 1, which is characterized in that the detection module includes charging detection
Module and discharge examination submodule, the compensating module include charging compensation submodule and discharging compensation submodule,
The charging compensation submodule is connect with the charging detection sub-module, the charging detection sub-module and the control mould
Plate connects, and the charging detection sub-module obtains the working condition of external circuit and the Regulate signal of the charging compensation submodule
The control module is sent to, the control module controls external circuit according to the signal that the charging detection sub-module is sent
Connection is closed；
The discharging compensation submodule is connect with the discharge examination submodule, the discharge examination submodule and the control mould
Plate connects, and the discharge examination submodule obtains the working condition of external circuit and the Regulate signal of the discharging compensation submodule
The control module is sent to, the control module controls external circuit according to the signal that the discharge examination submodule is sent
Connection is closed.
3. Li battery protection IC according to claim 2, which is characterized in that including charging constant pressure source and electric discharge constant pressure
Source,
The charging constant pressure source is connect with the charging compensation submodule, and the charging constant pressure source sends reference voltage signal to institute
State charging compensation submodule；
The electric discharge constant pressure source is connect with the discharging compensation submodule, and the electric discharge constant pressure source sends reference voltage signal to institute
State charging compensation submodule.
4. Li battery protection IC according to claim 3, which is characterized in that the discharging compensation submodule includes resistance
R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower
LM1A, one end of the resistance R3 are connect with the in-phase input end of the voltage follower LM1A, the other end of the resistance R3
It is connected between one end of the resistance R4 and the resistance R5, the resistance R5 is connect with ground wire, and the resistance R4's is another
End is connected between the positive power source terminal of the LM1A and the compensation power supply B1, and the compensation power supply B1 is connected with ground wire, described
The negative power end of voltage follower is connect with ground wire, and one end of the resistance R2 is connected to one end of the resistance R1 and the electricity
Between the inverting input for pressing follower LM1A, the other end of the resistance R2 is connect with electric discharge constant pressure source, and the resistance Rf1 connects
Between the inverting input and output terminal that meet the voltage follower LM1A, the other end of the resistance R1 is connected to the resistance
Between one end of R6 and one end of the resistance R7, the other end of the resistance R6 is connect with external circuit, the resistance R7's
The other end is connect with ground wire, and the output terminal of the voltage follower LM1A is connect with the discharge examination submodule.
5. Li battery protection IC according to claim 2, which is characterized in that the discharging compensation submodule includes resistance
R1, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance Rf1, compensation power supply B1 and voltage follower LM1A, institute
The one end for stating resistance R3 is connect with the in-phase input end of the voltage follower LM1A, and the other end of the resistance R3 is connected to institute
It states between one end of resistance R4 and the resistance R5, the resistance R5 is connect with ground wire, and the other end of the resistance R4 is connected to
Between the positive power source terminal of the LM1A and the compensation power supply B1, the compensation power supply B1 is connected with ground wire, the voltage follow
The negative power end of device is connect with ground wire, and one end of the resistance R1 is connected with the inverting input of the voltage follower LM1A,
Between the inverting input and output terminal of the resistance Rf1 connections voltage follower LM1A, the other end of the resistance R1
It is connected between one end of the resistance R6 and one end of the resistance R7, the other end and the external circuit of the resistance R6 connect
It connects, the other end of the resistance R7 is connect with ground wire, the output terminal of the voltage follower LM1A and the discharge examination submodule
Block connects.
6. Li battery protection IC according to claim 5, which is characterized in that the discharging compensation submodule includes resistance
R1, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance Rf1, diode D1, compensation power supply B1 and
Voltage follower LM1A, one end of the resistance R3 are connect with the in-phase input end of the voltage follower LM1A, the resistance
The other end of R3 is connected between one end of the resistance R4 and the resistance R5, and the resistance R5 is connect with ground wire, the electricity
The other end of resistance R4 is connected between the positive power source terminal of the LM1A and the compensation power supply B1, the compensation power supply B1 and ground wire
Connection, the negative power end of the voltage follower are connect with ground wire, one end of the resistance R1 and the voltage follower LM1A
Inverting input connection, between the inverting input and output terminal of the resistance Rf1 connections voltage follower LM1A, institute
The other end for stating resistance R1 is connected between one end of the resistance R6 and one end of the resistance R7, and the resistance R6's is another
End is connect with external circuit, and the other end of the resistance R7 is connect with ground wire, and the diode D1 is connected to the voltage follow
Between the output terminal of device LM1A and the resistance R8, the resistance R8 is connect with the discharge examination submodule.
7. according to the Li battery protection IC described in claim 3-5 any one, which is characterized in that the charging compensation submodule
Block is identical with the circuit structure of the discharging compensation submodule.
8. a kind of lithium battery protection circuit, which is characterized in that arbitrary including lithium battery B2, protection switch and claim 1-7
Li battery protection IC described in one, the lithium battery B2 are connect with the protection chip, the protection switch and the guarantor
Chip connection is protected, the lithium battery B2 is connected with the protection switch.
9. lithium battery protection circuit according to claim 8, which is characterized in that when the chip is retouched by claim 7
During the chip stated, the protection switch includes charging protection switch metal-oxide-semiconductor Q1 and discharge protection switch metal-oxide-semiconductor Q2, the lithium electricity
The anode of pond B2 is connect with the circuit anode EB+, and the cathode of the lithium battery B2 is connect with the source electrode of the metal-oxide-semiconductor Q1, institute
The drain electrode for stating metal-oxide-semiconductor Q1 is connect with the drain electrode of the metal-oxide-semiconductor Q2, and the source electrode of the metal-oxide-semiconductor Q2 connects with the circuit cathode EB-
It connects, the grid of the metal-oxide-semiconductor Q1 is connect with the Li battery protection IC, and grid and the lithium battery of the metal-oxide-semiconductor Q2 are protected
Protect chip connection.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes the lithium electricity described in claim 1-7 any one
Lithium battery protection circuit described in pond protection chip and claim 8-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721647438.4U CN207490496U (en) | 2017-11-29 | 2017-11-29 | Li battery protection IC, protection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721647438.4U CN207490496U (en) | 2017-11-29 | 2017-11-29 | Li battery protection IC, protection circuit and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611295A (en) * | 2019-09-04 | 2019-12-24 | 成都蓉创电子科技有限公司 | Current compensation circuit of lithium battery protection chip |
| CN117394508A (en) * | 2023-12-13 | 2024-01-12 | 成都利普芯微电子有限公司 | Battery protection packaging body |
-
2017
- 2017-11-29 CN CN201721647438.4U patent/CN207490496U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611295A (en) * | 2019-09-04 | 2019-12-24 | 成都蓉创电子科技有限公司 | Current compensation circuit of lithium battery protection chip |
| CN110611295B (en) * | 2019-09-04 | 2022-03-25 | 成都芯港微电子有限公司 | Current compensation circuit of lithium battery protection chip |
| CN117394508A (en) * | 2023-12-13 | 2024-01-12 | 成都利普芯微电子有限公司 | Battery protection packaging body |
| CN117394508B (en) * | 2023-12-13 | 2024-04-02 | 成都利普芯微电子有限公司 | Battery protection packaging body |
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