CN106771493A - A kind of multi-series lithium battery voltage detecting circuit based on mirror current source - Google Patents
A kind of multi-series lithium battery voltage detecting circuit based on mirror current source Download PDFInfo
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- CN106771493A CN106771493A CN201611229192.9A CN201611229192A CN106771493A CN 106771493 A CN106771493 A CN 106771493A CN 201611229192 A CN201611229192 A CN 201611229192A CN 106771493 A CN106771493 A CN 106771493A
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- triode
- voltage
- lithium battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of multi-series lithium battery voltage detecting circuit, more particularly to a kind of multi-series lithium battery voltage detecting circuit based on mirror current source.The present invention includes voltage detection module, voltage sample module, control module, the voltage detection module is set to multiple, each voltage detection module is separately positioned on a positive and negative end for lithium battery, the signal output part of the signal input part link control module of the voltage detection module, the signal output part of voltage detection module connects the signal input part of voltage sample module.Multi-string battery high-voltage signal can be converted into low-voltage signal and be detected for BMS by the present invention, realize inexpensive, high-precision multi-string battery voltage sample, and the reliability and maintainability of circuit is strong, if there is the phenomenon of voltage detecting winding displacement wrong, due to being provided with three triodes in voltage detection module, triode has pressure-resistant feature, can effectively prevent the damage of circuit.
Description
Technical field
The present invention relates to a kind of multi-series lithium battery voltage detecting circuit, more particularly to a kind of many strings based on mirror current source
Lithium battery voltage detects circuit.
Background technology
Current electric automobile is using multiple lithium battery series connection as power, and electric powered motor lithium battery series voltage is usual
300V~400V is up to arrived, the scope for often saving lithium battery voltage is 2.5V~3.9V, so electrokinetic cell needs more than 100 string electricity
Pond, BMS (cell management system of electric automobile) is the important tie for connecting onboard power lithium battery and electric automobile, and its is most important
Function just includes lithium battery voltage real-time monitoring, during charging and discharging lithium battery, BMS Real-time Collection electric automobile lithium battery groups
In every series lithium battery voltage, prevent lithium battery occur overcharge or overdischarge phenomenon.
The integrated chip for being provided usually using some producers in the prior art or the square constituted using multiple high-performance optocouplers
Battle array carries out the detection of multi-series lithium battery voltage, but the battery strings number of each chip detection is few, it is desirable to complete 100 multi-string batteries
Detection generally need multiple chips, therefore testing cost is high, meanwhile, if voltage detecting winding displacement misconnection can cause chip to burn
Ruin, therefore reliability and maintainability is poor.
The content of the invention
The present invention is in order to overcome the above-mentioned deficiencies of the prior art, there is provided a kind of multi-series lithium battery based on mirror current source
Voltage detecting circuit, the present invention can by multi-string battery high-voltage signal be converted into low-voltage signal for BMS detect, realize it is low into
Originally, high-precision multi-string battery voltage sample, and the reliability and maintainability of circuit is strong.
To achieve the above object, present invention employs following technical measures：
A kind of multi-series lithium battery voltage detecting circuit based on mirror current source includes voltage detection module, voltage sample mould
Block, control module, wherein,
Voltage detection module is set to multiple, and each voltage detection module is separately positioned on a both positive and negative polarity for lithium battery
Two ends, the signal output part of the signal input part link control module of the voltage detection module, the signal of voltage detection module
Output end connects the signal input part of voltage sample module.
Preferably, the voltage detection module includes the first triode, the second triode, the 3rd triode, described first
The base stage of triode base stage respectively with the second triode, the colelctor electrode of the second triode, the emitter stage of the 3rd triode are connected,
The emitter stage of the first triode, the emitter stage of the second triode connect one end of one end of first resistor, second resistance, institute respectively
State the other end of first resistor, the other end of second resistance and be all connected with the positive pole of lithium battery, the colelctor electrode difference of the first triode
One end of 3rd resistor and the base stage of the 3rd triode are connected, the negative pole of the other end connection lithium battery of the 3rd resistor is simultaneously
Ground connection, the colelctor electrode of the 3rd triode is connected with the drain electrode of metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects the one of the 4th resistance respectively
End, the signal input part of voltage sample module, the other end ground connection of the 4th resistance, the grid link control module of metal-oxide-semiconductor
Signal output part.
Preferably, first triode, the second triode be arranged in same substrate to pipe, the described 1st
The model of pole pipe and the second triode is LMBT3906DW1T1；The model MMBTA92 of the 3rd triode；The MOS
The model BSS131 of pipe.
Further, the voltage sample module is the AD sampling pins of the processor of battery management system, control module
It is the IO controlling switch of the processor of battery management system.
The beneficial effects of the present invention are：
1), the present invention includes voltage detection module, voltage sample module, control module, will be every by voltage detection module
A string of lithium battery voltage signals are converted into current signal, by the primary current relation equal with secondary time-dependent current, gather secondary
The size of electric current can calculate lithium battery voltage, therefore multi-string battery high-voltage signal can be converted into low-voltage signal and supplied by the present invention
BMS detections, realize inexpensive, high-precision multi-string battery voltage sample, and the reliability and maintainability of circuit is strong.
2), if there is the phenomenon of voltage detecting winding displacement wrong, due to being provided with three triodes in voltage detection module,
Triode has pressure-resistant feature, can effectively prevent the damage of circuit.
3), the present invention detects V by voltage sample moduleECO1Voltage, compensate for environment temperature and this circuit caused
Influence so that temperature drift of the invention is extremely low.
4), first triode, the second triode be arranged in same substrate to pipe, first triode
Model with the second triode is LMBT3906DW1T1；The model MMBTA92 of the 3rd triode；The metal-oxide-semiconductor
Model BSS131.The part of above-mentioned multiple specific models is worked in coordination, and realizes optimal design of the invention.
Brief description of the drawings
Fig. 1 is structural principle block diagram of the invention；
Fig. 2 is the circuit theory diagrams of multiple voltage detection modules of the invention；
Fig. 3 is voltage detection module of the invention signal flow graph in the course of the work.
10-voltage detection module, 20-voltage sample, 30-control module of module
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of multi-series lithium battery voltage detecting circuit based on mirror current source includes voltage detection module
10th, voltage sample module 20, control module 30, the voltage detection module 10 are set to multiple, each voltage detection module
10 are separately positioned on a positive and negative end for lithium battery, the signal input part link control module of the voltage detection module 10
30 signal output part, the signal input part of the signal output part connection voltage sample module 20 of voltage detection module 10.
The voltage sample module 20 is used for collection voltages signal, and control module 30 is used to control this multi-series lithium battery voltage
Detect being turned on and off for circuit.
As shown in Fig. 2 the voltage detection module 10 includes the first triode Q1, the second triode Q2, the 3rd triode
The base stage of Q3, the first triode Q1 base stage, colelctor electrode, the three or three of the second triode Q2 respectively with the second triode Q2
The emitter stage of pole pipe Q3 is connected, and the emitter stage of the first triode Q1, the emitter stage of the second triode Q2 connect first resistor respectively
One end of R1, one end of second resistance R2, the other end of the first resistor R1, the other end of second resistance R2 are all connected with lithium electricity
The positive pole in pond, the colelctor electrode of the first triode Q1 connects one end of 3rd resistor R3 and the base stage of the 3rd triode Q3 respectively,
The negative pole of the other end connection lithium battery of the 3rd resistor R3 is simultaneously grounded, the colelctor electrode and metal-oxide-semiconductor of the 3rd triode Q3
Drain electrode be connected, the source electrode of metal-oxide-semiconductor connects one end of the 4th resistance R4, the signal input part of voltage sample module 20, institute respectively
State the other end ground connection of the 4th resistance R4, the signal output part of the grid link control module 30 of metal-oxide-semiconductor.
The reference voltage detection of single lithium battery is 1.5V~5V.
Specifically, the resistance in voltage detection module 10 is precision resister, first resistor R1 and second resistance R2 are equal
It is 1K Ω, 3rd resistor R3 is 15K Ω, and the 4th resistance R4 is 16K Ω.Therefore, the first triode Q1, the second equal works of triode Q2
Make in amplification region, direct current multiplication factor β is 100~300.
The first triode Q1, the second triode Q2 be arranged in same substrate to pipe, the one or three pole
The model of pipe Q1 and the second triode Q2 is LMBT3906DW1T1；The model MMBTA92 of the 3rd triode Q3；Institute
State the model BSS131 of metal-oxide-semiconductor.
The voltage sample module 20 is the AD sampling pins of the processor of battery management system, and control module 30 is battery
The IO controlling switch of the processor of management system.
As shown in figure 3, the IO controlling switch of the processor of BMS sends high level gives controlling switch control, MOS is controlled
Circuit is started working after pipe is opened, from the electric current I of lithium battery anode outflowBIt is divided into two-way electric current respectively primary current IE1, it is secondary
Side electric current IE2, primary current IE1The first triode Q1 is flowed to through first resistor R1, then from the first triode Q1 outflows, outflow
Electric current is IC1；Secondary current IE2The second triode Q2 is flowed to through second resistance R2, then from the second triode Q2 outflows, outflow
Electric current is IC2；IC2The 3rd triode Q3, metal-oxide-semiconductor are sequentially passed through, the electric current of metal-oxide-semiconductor outflow is IC3, IC3Flowed by the 4th resistance R4
To the negative pole of lithium battery.
Single voltage detection module 10 is to the process that lithium battery carries out voltage detecting：
As shown in figure 3, because the operating voltage of single lithium battery is more than 1.5V so that the first triode Q1 and the two or three
Pole pipe Q2 is operated in amplification region, because the first triode Q1 and the second triode Q2 are that, to pipe, parameter characteristic is consistent, therefore the
The emitter stage U consistent with the voltage difference of base stage of one triode Q1 and the second triode Q2EBO1=UEBO2, so IB1=IB2。
Because the direct current multiplication factor β of the first triode Q1 and the second triode Q2 is far longer than 1, institute is in IE1≈IC1, IE2
≈IC2。
Due toSo IC1≈IC2。
The voltage computing formula of lithium battery is：
VB1=IE1*R1+IC1*R3+VEC1=IC1*(R1+R3)+VECO1=IC2*R4+VEC1=V1+VECO1V1Can be by battery
The AD sampling pins of the processor of management system carry out AD collections, VECO1It is the emitter and collector pressure of the first triode Q1
Drop, can carry out AD acquisition testings by difference channel.Detection VECO1Voltage can eliminate variation of ambient temperature to triode
Influence.
The I during work of voltage detection module 10E1+IE2About 150uA, power consumption is extremely low.
As shown in Figure 2,3, multiple voltage detection modules 10 are respectively to the process that lithium battery carries out voltage detecting：
By VB2=V2+VECO2, VB3=V3+VECO3
The V in the case of multi-string battery voltage difference uniformity is preferableECO1≈VECO2≈VECO3, this species diversity can pass through
Software calibration is eliminated.
It can thus be seen that multi-string battery high-voltage signal can be converted into low-voltage signal by the present invention being detected for BMS, realize
Inexpensive, high-precision multi-string battery voltage sample, and the suitable batch production of the present invention uses.
Claims (4)
1. a kind of multi-series lithium battery voltage detecting circuit based on mirror current source, it is characterised in that：Including voltage detection module
(10), voltage sample module (20), control module (30), wherein,
Voltage detection module (10) is set to multiple, and each voltage detection module (10) is being separately positioned on a lithium battery just
Negative pole two ends, the signal output part of the signal input part link control module (30) of the voltage detection module (10), voltage inspection
Survey the signal input part of signal output part connection voltage sample module (20) of module (10).
2. a kind of multi-series lithium battery voltage detecting circuit based on mirror current source as claimed in claim 1, it is characterised in that：
The voltage detection module (10) includes the first triode (Q1), the second triode (Q2), the 3rd triode (Q3), described first
The base stage of triode (Q1) base stage, the colelctor electrode of the second triode (Q2), the 3rd triode respectively with the second triode (Q2)
(Q3) emitter stage is connected, and the emitter stage of the first triode (Q1), the emitter stage of the second triode (Q2) connect the first electricity respectively
Hinder one end, the one end of second resistance (R2) of (R1), the other end of the first resistor (R1), the other end of second resistance (R2)
The positive pole of lithium battery is all connected with, the colelctor electrode of the first triode (Q1) connects one end and the three or three of 3rd resistor (R3) respectively
The base stage of pole pipe (Q3), the negative pole of the other end connection lithium battery of the 3rd resistor (R3) is simultaneously grounded, the 3rd triode
(Q3) colelctor electrode is connected with the drain electrode of metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects one end, the voltage sample of the 4th resistance (R4) respectively
The signal input part of module (20), the other end ground connection of the 4th resistance (R4), the grid link control module (30) of metal-oxide-semiconductor
Signal output part.
3. a kind of multi-series lithium battery voltage detecting circuit based on mirror current source as claimed in claim 2, it is characterised in that：
First triode (Q1), the second triode (Q2) be arranged in same substrate to pipe, first triode
And the model of the second triode (Q2) is LMBT3906DW1T1 (Q1)；The model of the 3rd triode (Q3)
MMBTA92；The model BSS131 of the metal-oxide-semiconductor.
4. a kind of multi-series lithium battery voltage detecting circuit based on mirror current source as claimed in claim 1, it is characterised in that：
The voltage sample module (20) is the AD sampling pins of the processor of battery management system, and control module (30) is battery management
The IO controlling switch of the processor of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611229192.9A CN106771493A (en) | 2016-12-27 | 2016-12-27 | A kind of multi-series lithium battery voltage detecting circuit based on mirror current source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611229192.9A CN106771493A (en) | 2016-12-27 | 2016-12-27 | A kind of multi-series lithium battery voltage detecting circuit based on mirror current source |
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| CN106771493A true CN106771493A (en) | 2017-05-31 |
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| CN201611229192.9A Pending CN106771493A (en) | 2016-12-27 | 2016-12-27 | A kind of multi-series lithium battery voltage detecting circuit based on mirror current source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113341323A (en) * | 2020-03-02 | 2021-09-03 | 合泰半导体(中国)有限公司 | Voltage monitoring device and voltage detection circuit thereof |
| CN117074836A (en) * | 2023-10-12 | 2023-11-17 | 成都明夷电子科技有限公司 | Laser detection method, detector, electronic equipment and storage medium |
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| CN113341323A (en) * | 2020-03-02 | 2021-09-03 | 合泰半导体(中国)有限公司 | Voltage monitoring device and voltage detection circuit thereof |
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| CN117074836A (en) * | 2023-10-12 | 2023-11-17 | 成都明夷电子科技有限公司 | Laser detection method, detector, electronic equipment and storage medium |
| CN117074836B (en) * | 2023-10-12 | 2024-03-12 | 成都明夷电子科技有限公司 | Laser detection method, detector, electronic equipment and storage medium |
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