CN101762789A - Series-connection battery voltage detection circuit - Google Patents
Series-connection battery voltage detection circuit Download PDFInfo
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- CN101762789A CN101762789A CN200910213957A CN200910213957A CN101762789A CN 101762789 A CN101762789 A CN 101762789A CN 200910213957 A CN200910213957 A CN 200910213957A CN 200910213957 A CN200910213957 A CN 200910213957A CN 101762789 A CN101762789 A CN 101762789A
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Abstract
The invention relate to a battery voltage detection circuit, in particular to a high-accuracy series-connection battery voltage detection circuit. The detection circuit comprises a main control unit and a sampling switch group composed of a plurality of sampling switches; both ends of each series-connected battery are respectively connected with a sampling switch, a sampling capacitor is connected between the other ends of the adjacent sampling switches, the sampling capacitors are connected in series sequentially, both ends of each sampling capacitor are respectively connected with two input ends of a difference circuit; an isolation switch is serially connected between every adjacent sampling capacitors, is used for isolating the sampling capacitors after the battery voltage is detected by the sampling capacitors, avoids mutual interference and guarantees the accuracy of the measurement result. The invention adopts isolation difference method to test the voltage on both ends of the battery, overcomes the defects of resistance voltage sharing method in prior art, has high voltage detection accuracy, not only can respectively measure each single battery, but also can measure multiple battery at the same time, is flexible in use and greatly improves the measurement efficiency.
Description
Technical field
The present invention relates to the battery voltage detection field, specifically be meant a kind of voltage detecting circuit of high-precision series-connected cell.
Background technology
Traditional lead-acid battery, Ni-Cr battery have that energy density is low, to recycle the life-span short and can not satisfy shortcoming such as environmental requirement, and are replaced by this new forms of energy of lithium battery gradually.In recent years, lithium battery was widely applied in fields such as electric tool, electronic toy, electric bicycle, electric automobiles.
Also there are some problems in the application of lithium battery in the prior art; for example overcharge easily that explosion out of control is caught fire or cross and put the damage life-span etc.; then need in use lithium battery is carried out especially accurate charge and discharge protecting, this also inevitable requirement lithium battery compressed into row detect quite accurately.Industry requirement must be controlled in tens millivolts the detection error of cell voltage.Traditional battery voltage detection is exported to integrated chip A/D thief hatch or is directly relatively exported modes such as (integrated IC) by comparer after adopting electric resistance partial pressure, the former because have that precision is low, series connection joint number many more intrinsic standoff ratios big more shortcoming of mistake more, also there are influences such as cumulative errors simultaneously, there is the series connection joint number shortcoming that high voltage damages easily for a long time, cost is high in the latter, and can not directly export the cell voltage of detection, so that other control is used, battery equilibrium etc. for example.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of voltage detecting circuit of high-precision series-connected cell.
According to the above-mentioned technical matters that needs solution, the present invention realizes by the following technical solutions: the voltage detecting circuit that a kind of series-connected cell is provided, comprise main control unit and be subjected to the sampling switch group of forming by a plurality of sampling switches of main control unit control, each single battery two ends of described series connection connect a sampling switch respectively, all be connected with a sampling capacitor between every adjacent samples switch other end, and described sampling capacitor is connected successively, and described each sampling capacitor two ends are connected with a difference channel two input ends respectively.
All be connected in series a disconnector between described every adjacent samples electric capacity, described disconnector is connected with main control unit; Isolate each sampling capacitor after this switch is used to make described sampling capacitor to cell voltage power taking to be measured, avoid the phase mutual interference, to guarantee the accuracy of measurement result.
The present invention adopts isolating difference method test battery both end voltage, overcomes the defective of prior art electric resistance partial pressure method of testing, and compared with prior art, beneficial effect is as follows:
1, detects the voltage accuracy height, can satisfy the accuracy requirement that lithium battery voltage detects fully;
2, can measure respectively each single battery, also can be simultaneously to a plurality of battery measurements, applying flexible improves efficiency of measurement greatly;
3, the joint number of can connecting is many, can realize that at most the series connection of tens batteries detects;
4, circuit is low from power consumption, has only microampere order;
5, battery voltage signal is through difference channel, and stable performance is not even the sampling switch component wear can cause damage to battery yet;
6, exportable other circuit of giving of detected battery voltage signal use, and use flexibly.
Description of drawings
Fig. 1 is a circuit theory synoptic diagram of the present invention.
Embodiment
For the ease of those skilled in the art's understanding, the present invention is described in further detail will to tie instantiation and accompanying drawing below:
As Fig. 1, in the voltage detecting circuit of series-connected cell of the present invention, corresponding each series connected battery (B1-Bn), each battery two ends connects a sampling switch (S1-Sn_1) respectively, because can a shared sampling switch between adjacent two batteries of series connection, so the quantity of sampling switch be lacked one than the quantity of mesuring battary; And connect a sampling capacitor (C1-Cn) respectively at every adjacent two sampling switch other ends, when all sampling switches are closed, form the circuit-mode of each mesuring battary two ends sampling capacitor all in parallel; Promptly corresponding each mesuring battary of corresponding each sampling capacitor all is provided with a difference channel, and promptly described each sampling capacitor two ends connect a difference channel (U1-Un) two input ends respectively.Between per two adjacent sampling capacitors, seal in a disconnector (K1-Kn), when promptly sampling switch is all closed, form the form of the circuit parallel connection that each mesuring battary and an electric capacity and disconnector connect.
During measurement, make each sampling switch and disconnector all closed, then cell voltage will charge for sampling capacitor, delay time an end after the time, by main control unit control each sampling switch and disconnector are disconnected, open difference channel, then each sampling capacitor both end voltage is input in the difference channel, the difference channel output terminal outputs signal to main control unit, and main control unit obtains accurate battery voltage value after signal is gathered calculating.
When needs to the series connected battery group in certain or some cell voltages when measuring, as long as connect corresponding sampling switch and disconnector, other circuit needn't be connected, and is easy to use, flexible.
Certainly, above-mentioned sampling capacitor can be an independent sampling capacitor, also can be the capacitance group that several capacitances in series are formed, and its function all is to battery voltage sampling to be measured.
Described sampling switch S1-Sn, disconnector K1-Kn all can adopt for example metal-oxide-semiconductor or triode or relay realization, the mode that is various realization switch on and off all can, comprise complete electric disconnection or diode characteristic disconnect mode, and its break-make is controlled by main control unit.
Circuit of the present invention also can be applied to the battery voltage detection of other type, is not limited to lithium battery.
Above embodiment can not limit the present invention with this only for the preferable implementation of the present invention, conceives under the prerequisite in the present invention that do not come off, and its any being equal to of doing is replaced and subtle change all belongs to protection scope of the present invention.
Claims (2)
1. series-connection battery voltage detection circuit, comprise main control unit and be subjected to the sampling switch group of forming by a plurality of sampling switches of main control unit control, it is characterized in that: each single battery two ends of described series connection connect a sampling switch respectively, all be connected with a sampling capacitor between every adjacent samples switch other end, and described sampling capacitor is connected successively, and described each sampling capacitor two ends are connected with a difference channel two input ends respectively.
2. series-connection battery voltage detection circuit according to claim 1 is characterized in that: all be connected in series a disconnector between described every adjacent samples electric capacity, described disconnector is connected with main control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910213957A CN101762789A (en) | 2009-12-16 | 2009-12-16 | Series-connection battery voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910213957A CN101762789A (en) | 2009-12-16 | 2009-12-16 | Series-connection battery voltage detection circuit |
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| CN101762789A true CN101762789A (en) | 2010-06-30 |
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| CN200910213957A Pending CN101762789A (en) | 2009-12-16 | 2009-12-16 | Series-connection battery voltage detection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288919A (en) * | 2011-05-11 | 2011-12-21 | 张兴发 | Voltage measuring system and method for battery |
| CN102608512A (en) * | 2012-04-11 | 2012-07-25 | 上海电力学院 | Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line |
| CN102652265A (en) * | 2010-12-06 | 2012-08-29 | 科达汽车公司 | Measuring isolated high voltage and detecting isolation breakdown with measures for self-detection of circuit faults |
| CN102692604A (en) * | 2011-03-24 | 2012-09-26 | 比亚迪股份有限公司 | State detection circuit of multiple rechargeable batteries in series connection |
| CN103003705A (en) * | 2010-07-14 | 2013-03-27 | 矢崎总业株式会社 | Battery pack voltage detection device |
| CN108414870A (en) * | 2017-02-10 | 2018-08-17 | 深圳市理邦精密仪器股份有限公司 | More battery detection circuit for access and electronic equipment |
| CN108964418A (en) * | 2017-05-25 | 2018-12-07 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
| CN110471481A (en) * | 2019-09-16 | 2019-11-19 | 南京中感微电子有限公司 | A kind of high-precision pressure regulator |
-
2009
- 2009-12-16 CN CN200910213957A patent/CN101762789A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103003705B (en) * | 2010-07-14 | 2015-04-08 | 矢崎总业株式会社 | Battery pack voltage detection device |
| CN103003705A (en) * | 2010-07-14 | 2013-03-27 | 矢崎总业株式会社 | Battery pack voltage detection device |
| US9007066B2 (en) | 2010-12-06 | 2015-04-14 | Coda Energy Holdings Llc | Measuring isolated high voltage and detecting isolation breakdown with measures for self-detection of circuit faults |
| CN102652265A (en) * | 2010-12-06 | 2012-08-29 | 科达汽车公司 | Measuring isolated high voltage and detecting isolation breakdown with measures for self-detection of circuit faults |
| CN102692604A (en) * | 2011-03-24 | 2012-09-26 | 比亚迪股份有限公司 | State detection circuit of multiple rechargeable batteries in series connection |
| CN102288919B (en) * | 2011-05-11 | 2013-06-26 | 张兴发 | Voltage measuring system and method for battery |
| CN102288919A (en) * | 2011-05-11 | 2011-12-21 | 张兴发 | Voltage measuring system and method for battery |
| CN102608512B (en) * | 2012-04-11 | 2014-07-09 | 上海电力学院 | Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line |
| CN102608512A (en) * | 2012-04-11 | 2012-07-25 | 上海电力学院 | Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line |
| CN108414870A (en) * | 2017-02-10 | 2018-08-17 | 深圳市理邦精密仪器股份有限公司 | More battery detection circuit for access and electronic equipment |
| CN108964418A (en) * | 2017-05-25 | 2018-12-07 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
| CN108964418B (en) * | 2017-05-25 | 2021-08-17 | 中兴通讯股份有限公司 | Voltage sampling circuit and circuit system |
| CN110471481A (en) * | 2019-09-16 | 2019-11-19 | 南京中感微电子有限公司 | A kind of high-precision pressure regulator |
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Application publication date: 20100630 |