CN101769954A - Voltage detecting circuit for multiple serial batteries - Google Patents
Voltage detecting circuit for multiple serial batteries Download PDFInfo
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- CN101769954A CN101769954A CN201010113221A CN201010113221A CN101769954A CN 101769954 A CN101769954 A CN 101769954A CN 201010113221 A CN201010113221 A CN 201010113221A CN 201010113221 A CN201010113221 A CN 201010113221A CN 101769954 A CN101769954 A CN 101769954A
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Abstract
The invention discloses a voltage detecting circuit for multiple serial batteries, comprising an operational amplifier, a first resistor, a second resistor, an insulated gate field-effect transistor and a voltmeter. The same-phase input end of the operational amplifier is used as a low potential detecting input end, the invert-phase input end of the operational amplifier is respectively connected with the source electrode of the insulated gate field-effect transistor and one end of the first resistor, the other end of the first resistor is used as a high potential detecting input end, the output end of the operational amplifier is connected with the grid electrode of the insulated gate field-effect transistor, the drain electrode of the insulated gate field-effect transistor is grounded through the second resistor, and the input end of the voltmeter is connected to the drain electrode of the insulated gate field-effect transistor and the contact of the second resistor. The voltage detecting circuit can be used for detecting the voltage of each electric core in tens to hundreds of serial battery packs and has the advantages of high detecting precision, low cost, low power consumption and the like.
Description
[technical field]
The present invention relates to a kind of voltage detecting circuit of multi-section serial battery.
[background technology]
On market in the existing battery management system, multi-section serial especially surpasses in the above series battery of 4 joints the voltage detecting to every economize on electricity core, it is a technical barrier, specialized voltages detection chip cost on the market is very high, precision is low can only accomplish 20mV, the series-connected cell joint number that detects is restricted, and maximum only to 13 joints, power consumption is also bigger.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, and provide a kind of and can detect the voltage that reaches each electric core in tens of extremely joint series batteries up to a hundred, the accuracy of detection height, cost is lower, voltage detecting circuit low in energy consumption.
For achieving the above object, the present invention has adopted following technical proposal: the present invention is the voltage detecting circuit of multi-section serial battery, include operational amplifier N1, first, second resistance R 1, R2, isolated gate FET Q1 and voltage table, the in-phase input end of described operational amplifier N1 detects input end as electronegative potential, the source electrode of the inverting input of described operational amplifier N1 and isolated gate FET Q1, one end of first resistance R 1 connects respectively, the other end of first resistance R 1 detects input end as noble potential, the output terminal of described operational amplifier N1 is connected with the grid of isolated gate FET Q1, the drain electrode of isolated gate FET Q1 is by second resistance R, 2 ground connection, and the input end of described voltage table is connected on the contact of the drain electrode of isolated gate FET Q1 and second resistance R 2.
Described second resistance equates with the resistance of first resistance.
Described operational amplifier is a CMOS class operational amplifier.
Described field effect transistor is an insulated gate P-channel field-effect transistor (PEFT) pipe.
Described first resistance, second resistance are precision resistance.
The invention has the beneficial effects as follows: 1, because the voltage transitions of inventive circuit is not subjected to the voltage limit of low level battery Battery_L, therefore unrestricted in theory to the series connection joint number of electric battery, as long as isolated gate FET Q1's is withstand voltage enough, just can conversion, can detect the high-order cell voltage that total series voltage reaches several hectovolts, battery series connection quantity is improved greatly, can directly detect every economize on electricity core voltage in the series battery of tens joints even joints up to a hundred.2, the voltage transformation of circuit of the present invention only adds 1 operational amplifier with 1 field effect transistor and 2 resistance just can realize that circuit structure is simple, and cost is lower.3, first, second resistance R 1 and R2 adopt the higher resistance of resistance, and it is very low that the power consumption of testing circuit is accomplished, when selecting the operational amplifier of CMOS class for use, power consumption stream can be accomplished tens uA.
[description of drawings]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
Fig. 1 is a circuit structure diagram of the present invention.
[embodiment]
Referring to Fig. 1, the present invention is the voltage detecting circuit of multi-section serial battery, include operational amplifier N1, first, second resistance R 1, R2, isolated gate FET Q1 and voltage table V1, the in-phase input end of described operational amplifier N1 detects input end as electronegative potential, the source electrode of the inverting input of described operational amplifier N1 and isolated gate FET Q1, one end of first resistance R 1 connects respectively, the other end of first resistance R 1 detects input end as noble potential, the output terminal of described operational amplifier N1 is connected with the grid of isolated gate FET Q1, the drain electrode of isolated gate FET Q1 is by second resistance R, 2 ground connection, and the input end of described voltage table V1 is connected on the contact of the drain electrode of isolated gate FET Q1 and second resistance R 2.
Described first resistance R 1, second resistance R 2 adopt the higher precision resistance of resistance, and described operational amplifier N1 is a CMOS class operational amplifier.Described field effect transistor Q1 is an insulated gate P-channel field-effect transistor (PEFT) pipe.Described second resistance R 2 equates with the resistance of first resistance R 1, the resistance of described second resistance R 2 also can with the proportional setting of the resistance of first resistance R 1.
When detecting the voltage of every batteries in the electric battery, the battery that is detected is defined as high-order battery, a battery or a plurality of series connected battery that will be connected with this high position battery cathode are defined as the low level battery, the in-phase input end of operational amplifier N1 is connected on the positive pole of the negative pole of high-order battery and low level battery, with the minus earth of low level battery, first resistance R 1 is connected with high-order anode as the end that noble potential detects input end.Because the grid G of isolated gate FET Q1 does not have electric current, the input end of operational amplifier N1 is a high impedance status, electric current is also almost nil, therefore electric current can only be from the loop stream mistake of first resistance R 1, isolated gate FET Q1, second resistance R, 2 formations, and it is identical with the electric current of second resistance R 2 to flow through first resistance R 1.
Resistance relation between first resistance R 1 and second resistance R 2 is generally R2=KR1, K is a natural number or greater than zero mark, therefore, when first resistance R 1 identical with second resistance R, 2 resistances, when being K=1, the pressure drop that electric current is produced on first resistance R 1 and second resistance R 2 is just identical, because the in-phase input end of operational amplifier is identical with the inverting input current potential, therefore be added in the voltage that the 1 ohmically pressure drop of first resistance R just equals high-order battery Battery_H, therefore also just be equal to the voltage of high-order battery Battery_H in the 2 ohmically pressure drops of second resistance R, thereby make the voltage of high-order battery Battery_H just change the 2 ohmically pressure drops of second resistance R.And voltage table is surveyed is pressure drop on second resistance R 2, so the reading of voltage table is exactly the voltage of high-order battery Battery_H.When the resistance of first resistance R 1 during greater than the resistance of second resistance, promptly 0＜K＜1 o'clock can know that by above-mentioned analysis the 1/K of the reading of voltage table V1 doubly is exactly the voltage of high-order battery Battery_H.When the resistance of first resistance R 1 during less than the resistance of second resistance, promptly K＞1 o'clock can know that by above-mentioned analysis the 1/K of the reading of voltage table V1 doubly is exactly the voltage of high-order battery Battery_H.
Because the voltage transitions of inventive circuit is not subjected to the voltage limit of low level battery Battery_L, therefore unrestricted in theory to the series connection joint number of electric battery, as long as isolated gate FET Q1 withstand voltage enough, just can conversion, can detect the high-order cell voltage that total series voltage reaches several hectovolts.The voltage transformation of this circuit only adds 1 operational amplifier with 1 field effect transistor and 2 resistance just can realize that cost is lower.
Claims (5)
1. the voltage detecting circuit of multi-section serial battery, it is characterized in that including operational amplifier (N1), first, second resistance (the R1, R2), isolated gate FET (Q1) and voltage table (V1), the in-phase input end of described operational amplifier (N1) detects input end as electronegative potential and is connected between high-order battery and the low level battery contact, the minus earth of low level battery, the source electrode of the inverting input of described operational amplifier (N1) and isolated gate FET (Q1), one end of first resistance (R1) connects respectively, the other end of first resistance (R1) detects input end as noble potential and is connected with the positive pole of high-order battery, the output terminal of described operational amplifier (N1) is connected with the grid of isolated gate FET (Q1), the drain electrode of isolated gate FET (Q1) is by second resistance (R2) ground connection, and the input end of described voltage table (V1) is connected on the contact of the drain electrode of isolated gate FET (Q1) and second resistance (R2).
2. the voltage detecting circuit of multi-section serial battery according to claim 1 is characterized in that described second resistance (R2) equates with the resistance of first resistance (R1).
3. the voltage detecting circuit of multi-section serial battery according to claim 1 is characterized in that described operational amplifier (N1) is a CMOS class operational amplifier.
4. the voltage detecting circuit of multi-section serial battery according to claim 1 is characterized in that described field effect transistor (Q1) is insulated gate P-channel field-effect transistor (PEFT) pipe.
5. the voltage detecting circuit of multi-section serial battery according to claim 1 and 2 is characterized in that described first resistance (R1), second resistance (R2) are precision resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101132211A CN101769954B (en) | 2010-01-27 | 2010-01-27 | Voltage detecting circuit for multiple serial batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101132211A CN101769954B (en) | 2010-01-27 | 2010-01-27 | Voltage detecting circuit for multiple serial batteries |
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| Publication Number | Publication Date |
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| CN101769954A true CN101769954A (en) | 2010-07-07 |
| CN101769954B CN101769954B (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101132211A Expired - Fee Related CN101769954B (en) | 2010-01-27 | 2010-01-27 | Voltage detecting circuit for multiple serial batteries |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841241A (en) * | 2011-06-23 | 2012-12-26 | 神讯电脑(昆山)有限公司 | Voltage detection circuit |
| CN102955056A (en) * | 2011-08-26 | 2013-03-06 | 华润矽威科技（上海）有限公司 | Sampling circuit and sampling method for high-end battery voltage |
| CN103487630A (en) * | 2013-09-22 | 2014-01-01 | 深圳市沛城电子科技有限公司 | High-end sampling battery voltage circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200976023Y (en) * | 2006-06-30 | 2007-11-14 | 佛山市顺德区顺达电脑厂有限公司 | CMOS battery voltage detecting circuit |
| CN201662610U (en) * | 2010-01-27 | 2010-12-01 | 中山市嘉科电子有限公司 | Novel voltage detection circuit of plurality of series batteries |
-
2010
- 2010-01-27 CN CN2010101132211A patent/CN101769954B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841241A (en) * | 2011-06-23 | 2012-12-26 | 神讯电脑(昆山)有限公司 | Voltage detection circuit |
| CN102955056A (en) * | 2011-08-26 | 2013-03-06 | 华润矽威科技（上海）有限公司 | Sampling circuit and sampling method for high-end battery voltage |
| CN102955056B (en) * | 2011-08-26 | 2017-02-08 | 华润矽威科技（上海）有限公司 | Sampling circuit and sampling method for battery pack high-voltage end battery voltage |
| CN103487630A (en) * | 2013-09-22 | 2014-01-01 | 深圳市沛城电子科技有限公司 | High-end sampling battery voltage circuit |
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| Publication number | Publication date |
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| CN101769954B (en) | 2012-08-22 |
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Granted publication date: 20120822 Termination date: 20130127 |