CN1175278C - 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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- CN1175278C CN1175278C CNB01129826XA CN01129826A CN1175278C CN 1175278 C CN1175278 C CN 1175278C CN B01129826X A CNB01129826X A CN B01129826XA CN 01129826 A CN01129826 A CN 01129826A CN 1175278 C CN1175278 C CN 1175278C
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- resistance
- sample line
- operational amplifier
- amplifier circuit
- voltage
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a voltage test circuit by using a four-wire method in a security protection mode, which belongs to the technical field of electronic detection and is suitable for the formation process and the detection process of nickel-hydrogen cells, nickel-cadmium cells, liquid lithium cells and polymer lithium cells. The present invention is characterized in that resistors are respectively bridged between a positive current sampling wire and a positive voltage sampling wire and between a negative current sampling wire and a negative voltage sampling wire; the present invention can ensure the voltage sampling precision in normal operation, can prevent the phenomena of overcharge, overdischarge or cell combustion and cell explosion due to the incapability of collecting cell voltages in abnormal operation, and can enhance the security in the detection process of the cells. The present invention has the advantages of simple and practical circuit and safe and reliable operation.
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 OA, stake resistance R3, input resistance R4, R5, feedback resistance R6 (Fig. 1).That connect battery among the figure is positive current sample line I+, and negative current sample line I-and positive voltage sample line V+, negative voltage sample line V-, UB are battery two ends sampled voltages; Be connected to the in-phase input end 3 of integrated operational amplifier circuit OA behind input resistance R4 of positive voltage sample line V+ serial connection, negative voltage sample line V-is connected in series the inverting input 2 that is connected to integrated operational amplifier circuit OA behind another input resistance R5; One termination positive current sample line I+ of a resistance R 1 in the cross-over connection resistance, the A point of another termination positive voltage sample line V+, another resistance R 2 one termination negative current sample line I-in the cross-over connection resistance, the B point of another termination negative voltage sample line V-; Stake resistance R3 one end ground connection, another termination connects the in-phase input end 3 of integrated operational amplifier circuit OA, the inverting input 2 of the termination integrated operational amplifier circuit OA of feedback resistance R6, the output terminal 6 of another termination integrated operational amplifier circuit OA.
Resistance R 3～R6 and integrated operational amplifier circuit OA 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+, negative current sample line I-all contact with battery well with positive voltage sample line V+, negative voltage sample line V-, discharging and recharging by positive current sample line I+, negative current sample line I-of battery finished, cell voltage directly obtains by positive voltage sample line V+, negative voltage sample line V-, cross-over connection resistance R 1 and R2 be by short circuit, avoided the influence of contact resistance when the current sample 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 positive voltage sample line V+, negative voltage sample line V-as if reasons such as occurring loose contact in the testing process, promptly be equivalent to positive voltage sample line V+, negative voltage sample line V-spins off from the voltage sample loop, this moment is owing to the existence of cross-over connection resistance R 1 between current sample line I+, positive voltage sample line V+ and negative current sample line I-, negative voltage sample line V-and R2, sampled voltage UB still can obtain by cross-over connection resistance R 1 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.
Among Fig. 1
I+ is the positive current sample line, and I-is the negative current sample line,
V+ is the positive voltage sample line, and V-is the negative voltage sample line;
R1, R2 are cross-over connection resistance, and R4, R5 are input resistances;
R6 is a feedback resistance, and R3 is a stake resistance;
OA is an integrated operational amplifier circuit;
The 3rd, the integrated operational amplifier circuit in-phase input end;
The 2nd, the integrated operational amplifier circuit inverting input;
The 6th, the output terminal of integrated operational amplifier circuit;
A is the contact of R1, R4;
B is the contact of R2, R5;
UB-battery two ends sampled voltage;
The differentiated voltage-to-ground of BV-.
Embodiment:
Below in conjunction with description of drawings embodiments of the invention.The present invention is with reference to accompanying drawing 1 design, and integrated operational amplifier circuit OA adopts amplifier OP07, and cross-over connection resistance R 1, R2 all select 510 Ω, stake resistance R3, and input resistance R4, R5, feedback resistance all select 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 (R1, R2), and integrated operational amplifier circuit (OA), stake resistance (R3), input resistance (R4, R5), feedback resistance (R6) is characterized in that:
Insert cross-over connection resistance (R1, R2) respectively between positive current sample line (I+) and the positive voltage sample line (V+) and between negative current sample line (I-) and the negative voltage sample line (V-), one termination positive current sample line (I+) of the resistance (R1) in the cross-over connection resistance, the A point of another termination positive voltage sample line (V+); Another resistance (R2) termination negative current sample line (I-) in the cross-over connection resistance, another termination connects the B point of negative voltage sample line (V-).
2, test circuit according to claim 1 is characterized in that:
Be connected to the in-phase input end (3) of integrated operational amplifier circuit (OA) behind positive voltage sample line (V+) input resistance of serial connection (R4); Negative voltage sample line (V-) is connected in series the inverting input (2) that is connected to integrated operational amplifier circuit (OA) behind another input resistance (R5).
3, test circuit according to claim 1 and 2 is characterized in that:
The inverting input (2) of one termination integrated operational amplifier circuit (OA) of feedback resistance (R6), the output terminal (6) of another termination integrated operational amplifier circuit (OA); Stake resistance (R3) end ground connection, the in-phase input end (3) of another termination integrated operational amplifier circuit (OA).
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 CN1415972A (en) | 2003-05-07 |
| CN1175278C true 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) |
Families Citing this family (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 |
| CN102723787B (en) * | 2012-05-22 | 2014-11-26 | 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
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| Publication number | Publication date |
|---|---|
| CN1415972A (en) | 2003-05-07 |
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