CN1415972A - Circuit for testing voltage using four-wire method in security protection mode - Google Patents
Circuit for testing voltage using four-wire method in security protection mode Download PDFInfo
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- CN1415972A CN1415972A CN 01129826 CN01129826A CN1415972A CN 1415972 A CN1415972 A CN 1415972A CN 01129826 CN01129826 CN 01129826 CN 01129826 A CN01129826 A CN 01129826A CN 1415972 A CN1415972 A CN 1415972A
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- resistance
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Abstract
A safety protection four line method voltage test circuit is suitable for formation and test NiH and nicad batteries and liquid LI battery and polymer Li battery characterizing in bridge connecting resistors between positive cement sampling line and positive voltage sampling line and negative current sampling line and negative voltage sampling line which either guarantees voltage sampling accuracy at normal work or perverts overcharge, overdischarge, burning or explosion at abnormal work to increase safety of battery detection process.
Description
Technical field:
A kind of circuit for testing voltage using four-wire method in security protection mode is applied to battery and changes into and detect on the separation system voltage sample to ni-mh, NI-G and lithium ion battery and poly-lithium battery testing process, belongs to the electric detective technology field.
Background technology:
Battery change into detection system in, the precision of voltage sample and reliability are the gordian techniquies that is related to the Performance And Reliability of total system, are directly connected to the quality that battery changes into, the accuracy and the battery of partial volume changes into, the security in the testing process.Common voltage sampling method has four-wire method sampling and two line method sampling at present.The advantage of four-wire method sampling is a voltage sample precision height, and it is less that sampling precision is influenced by charging and discharging currents, contact resistance, thereby accuracy of detection is easy to control.But its shortcoming is to separate owing to voltage sample line and battery charge and discharge the loop, former thereby adopt less than voltage circuit is controlled when out of control when battery clamp loose contact (or broken string) etc., because it is working properly to discharge and recharge major loop, very easily cause overcharging, crossing and put of battery, for the liquid lithium battery even cause battery explosion, jeopardize personal safety.And for two line method, because voltage sample line and current sample line are public on anchor clamps, in the testing process if adopt less than voltage because of loose contact, in fact this moment, battery also spun off from charging and discharging circuit, can not cause overcharging, crossing and put of battery, but sampling precision is low slightly, thereby system accuracy is poor slightly.
Summary of the invention:
The present invention seeks to overcome the shortcoming of traditional four-wire method voltage sample, a kind of circuit for testing voltage using four-wire method in security protection mode is provided, improve the reliability of sample circuit, thereby improved the security performance of entire cell detection system.
Circuit structure of the present invention comprises: cross-over connection resistance R 1, R2, integrated operational amplifier circuit IC, stake resistance R3, input resistance R4, R5, feedback resistance R6 (Fig. 1).The I+, the I-that connect battery among the figure are the current sample line, and V+, V-are the voltage sample line, and UB is battery two ends sampled voltages; Be connected to the positive input terminal 3 of IC behind the V+ voltage sample line serial connection input resistance R4, be connected to the negative input end 2 of IC behind the V-voltage sample line serial connection input resistance R5; Cross-over connection resistance R 1 one termination I+, another termination V+ (A point), cross-over connection resistance R 2 one termination I-, another termination V-(B point); Stake resistance R3 one end ground connection, 3 ends of another termination IC, 2 ends of the termination IC of feedback resistance R6, the output terminal 6 of another termination IC.Resistance R 3～R6 and IC OP07 constitute difference channel, are converted to cell voltage over the ground that differential voltage BV offers system, transform all cell voltages of back so all with respect to a public ground, be convenient to sampling system to sampled voltage collect, processing.The most control action of system sends according to the cell voltage that collects.
During operate as normal, current sample line I+, I-all contact with battery well with voltage sample line V+, V-, discharging and recharging by electric current line I+, I-of battery finished, cell voltage directly obtains by voltage sample line V+, V-, R1 and R2 be by short circuit, avoided the influence of contact resistance when the electric current line reads voltage.The cell voltage UB that adopts from the voltage sample line offers difference channel, produces differentiated voltage-to-ground BV and offers sampling system.Owing to be the four-wire method sampling during operate as normal, so sampling precision is than higher.
Can not directly obtain cell voltage UB from V+, V-as if reasons such as occurring loose contact in the testing process, promptly being equivalent to V+, V-spins off from the voltage sample loop, this moment is owing to the existence of cross-over connection resistance R 1 between I+, V+ and I-, V-and R2, sampled voltage UB still can obtain by R1 and R2, can not cause system to make testing process out of control because of adopting less than cell voltage; This moment, sampling precision was poor slightly owing in fact adopt the sampling of two collimation methods.As seen, as long as battery does not break away from and charges and discharge the loop, can adopt cell voltage, thereby improve the reliability of sample circuit greatly.Advantage of the present invention:
1, the precision in the time of can guaranteeing that battery is normally sampled can guarantee the security of battery charging and discharging again under the sampling abnormal conditions.
2, circuit is simple and practical, under the situation that does not cause equipment cost to increase, has improved safety, the reliability of equipment greatly.
Description of drawings:
Fig. 1 is a circuit for testing voltage using four-wire method in security protection mode of the present invention.
Embodiment:
Below in conjunction with description of drawings embodiments of the invention.The present invention designs with reference to Fig. 1, and IC adopts amplifier OP07, and resistance R 1, R2 are 510 Ω, and resistance R 3-R6 is 100K.For guaranteeing the differential voltage precision, resistance R 3-R6 must screen pairing, makes its error limitation (as 1 ‰) or employing precision resistance within the specific limits.
Claims (3)
1, a kind of security protection mode four-wire method test circuit comprises: cross-over connection resistance R 1, R2, and integrated operational amplifier circuit IC, stake resistance R3, input resistance R4, R5, feedback resistance R6 is characterized in that:
Reach difference cross-over connection resistance R 1, R2 between negative current sample line and the negative voltage sample line between positive current sample line and the positive voltage sample line, R1 one termination I+, another termination V+ (A point); R2 one termination I-, another termination V-(B point).
2, test circuit according to claim 1 is characterized in that:
Be connected to the positive input terminal 3 of IC behind the V+ voltage sample line serial connection input resistance R4; Be connected to the negative input end 2 of IC behind the V-voltage sample line serial connection input resistance R5.
3, according to claim 1,2 described test circuits, it is characterized in that:
2 ends of the termination IC of feedback resistance R6, the output terminal 6 of another termination IC; Resistance R 3 one end ground connection, 3 ends of another termination IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01129826XA CN1175278C (en) | 2001-10-30 | 2001-10-30 | Circuit for testing voltage using four-wire method in security protection mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01129826XA CN1175278C (en) | 2001-10-30 | 2001-10-30 | Circuit for testing voltage using four-wire method in security protection mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1415972A true CN1415972A (en) | 2003-05-07 |
| CN1175278C CN1175278C (en) | 2004-11-10 |
Family
ID=4669481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01129826XA Expired - Fee Related CN1175278C (en) | 2001-10-30 | 2001-10-30 | Circuit for testing voltage using four-wire method in security protection mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1175278C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713794B (en) * | 2009-10-23 | 2012-09-05 | 广州蓝奇电子实业有限公司 | Method for detecting poor contact of battery voltage testing terminals |
| CN102723787A (en) * | 2012-05-22 | 2012-10-10 | 成都慧拓自动控制技术有限公司 | Track distribution type electromagnetic induction charging device and charging method for underground tunnel |
| CN103064031A (en) * | 2012-12-28 | 2013-04-24 | 深圳职业技术学院 | Battery formation detecting system and absorption and protection circuit parameter selection method thereof |
-
2001
- 2001-10-30 CN CNB01129826XA patent/CN1175278C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713794B (en) * | 2009-10-23 | 2012-09-05 | 广州蓝奇电子实业有限公司 | Method for detecting poor contact of battery voltage testing terminals |
| CN102723787A (en) * | 2012-05-22 | 2012-10-10 | 成都慧拓自动控制技术有限公司 | Track distribution type electromagnetic induction charging device and charging method for underground tunnel |
| CN103064031A (en) * | 2012-12-28 | 2013-04-24 | 深圳职业技术学院 | Battery formation detecting system and absorption and protection circuit parameter selection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1175278C (en) | 2004-11-10 |
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