CN1248352C - Adjuster for lithium cell protective circuit protective threshold value - Google Patents
Adjuster for lithium cell protective circuit protective threshold value Download PDFInfo
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- CN1248352C CN1248352C CNB031267998A CN03126799A CN1248352C CN 1248352 C CN1248352 C CN 1248352C CN B031267998 A CNB031267998 A CN B031267998A CN 03126799 A CN03126799 A CN 03126799A CN 1248352 C CN1248352 C CN 1248352C
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- resistance
- threshold values
- voltage
- comparator
- lithium battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present invention relates to an adjusting device for protective threshold values of a lithium battery protection circuit. The present invention is composed of an overdischarge detecting comparator, an overcharge detecting comparator, a battery voltage sampling resistor, a reference voltage obtaining device of an over current detecting comparator, an over current detecting comparator, an over current and short circuit detection device and a logic control and level switching circuit. The device realizes the adjustment to protective threshold values of overcharge, overdischarge, over current, etc. of the lithium battery protection circuit.
Description
[technical field]
The present invention relates to a kind of adjusting device of protection threshold values such as lithium battery protection circuit overcharges, overdischarge, overcurrent.
[background technology]
At present, the method for adjustment of known lithium battery protection circuit protection threshold values is as follows:
1, a reference source voltage is adjusted to a predetermined value;
2, adjust the sample resistance of each threshold values respectively, to obtain a suitable threshold voltage;
3, because this threshold values lower (being about 0.2V) of overcurrent protection need use independently reference voltage source.
Owing to need the point of adjustment more, reach the purpose of accurate adjustment threshold values, have three kinds of methods to follow again:
1, adopts laser resistor trimming.The advantage of this method is: the resistance trimming point takes up room little, and resistance trimming is flexible, more resistance trimming point can be set, to meet the requirements of precision in circuit.Logic control circuit is simple; Shortcoming is: resistance trimming apparatus expensive, production cost height.
2, adopt electric resistance trimming.Advantage is: method is simple, and is low for equipment requirements; Shortcoming is: resistance trimming needs pad, is subjected to spatial limitation, and the quantity of resistance trimming point can not be provided with a lot, generally can only have about ten, thereby be difficult to reach desired precision.
3, use A/D converter and MCU control logic, replace the resistance adjustment.Advantage: the method with programming realizes various logic control, shortcoming: the difficulty that promotes design significantly.Taking than the large chip area causes cost to raise.
In order to overcome all deficiencies of existing threshold values method of adjustment, the present invention proposes a kind of lithium battery protection circuit threshold values adjusting device.By this device (seeing accompanying drawing 1); under the prerequisite that does not increase chip area; be aided with simple logic control circuit; just can adopt general electric resistance trimming equipment; reach the required precision that original laser resistor trimming just can reach; comprise additives for overcharge protection threshold values, over threshold values and overcurrent protection threshold values, thereby reduced production cost.
[summary of the invention]
It is simple to the purpose of this invention is to provide a kind of control circuit, adjusts the adjusting device of the high lithium battery protection circuit protection threshold values of precision.
Technical scheme of the present invention is as follows, and the adjusting device of lithium battery protection circuit protection threshold values of the present invention comprises:
The sample resistance 3 of cell voltage;
The detection comparator 2 that overcharges, two input is connected respectively to the sample resistance 3 and the first a reference source voltage of described cell voltage, and produces second output signal;
Reference voltage deriving means 4, the sample resistance 3 of its matching battery voltage produces the second a reference source voltage;
Over-current detection comparator 5, two input connect the second a reference source voltage and overcurrent and the short-circuit detecting device 6 that reference voltage deriving means 4 produces respectively, and produce the 3rd output signal;
Logic control and level shifting circuit 7, it receives first output signal, second output signal and the 3rd output signal, and produces an output signal at one of them output of two output.
The invention has the advantages that: in not increasing chip area and battery protecting circuit under the situation of the complexity of logic control circuit; adopt less resistance trimming point; by electric resistance trimming; realize the adjustment of protection threshold values such as lithium battery protection circuit overcharges, overdischarge, overcurrent; and reach desired precision, thereby reduced production cost.
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
[description of drawings]
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 be among the present invention reference source voltage Vref2 with supply voltage V
CCChange curve.
[embodiment]
Please refer to Fig. 1; the adjusting device of lithium battery protection circuit protection threshold values of the present invention comprises the sample resistance 3 of a cell voltage; this sample resistance 3 is composed in series by adjustable resistance Ra and resistance R b, Rc; wherein Rb is by i resistance R b1, Rb2 ... Rbi (2＜i＜100) is composed in series; an input that connects the overdischarge detection comparator 1 and the detection comparator 2 that overcharges at resistance R b two ends respectively; another input of these two comparators is connected on a reference source voltage Vref1, and its output is connected respectively to the input of a logic control and level shifting circuit 7.
I-1 comparator (U1, U2, Ui-1) a input is connected to resistance R b1, Rb2 ... between Rbi, another input is connected on a reference source voltage Vref1, output is connected to the grid of corresponding MOS (metal-oxide-semiconductor) transistor (hereinafter referred metal-oxide-semiconductor), is connected a resistance between the source electrode of each metal-oxide-semiconductor and drain electrode, and each resistance is connected.The output of above-mentioned comparator cooperates corresponding MOS switching tube that one adjustable a reference source voltage Vref2 is provided; this adjustable a reference source voltage Vref2 is input to an input of overcurrent protection comparator 5; another input of this over-current detection comparator 5 connects an overcurrent and short-circuit detecting device 6; its output is connected to an input of logic control and level shifting circuit 7; this logic control and level shifting circuit 7 have two output Cout; Dout, these two outputs are connected respectively to and are serially connected in battery and fill; the grid of two switch MOS pipes in the discharge loop.
Foregoing circuit can be divided on the function overcharge, overdischarge test section and overcurrent test section, below above-mentioned two parts are described in detail respectively.
1. overcharge and detect and the overdischarge test section:
The uncomfortable whole a reference source voltage Vref1 of the present invention is a resistance of removing to adjust sample resistance Ra according to the value of a reference source voltage Vref1, to reach the purpose of calibration threshold values.
Suppose in the circuit of the present invention that the excursion of voltage (E1-E2) is 0V～5V.With E2 is the voltage zero reference point, establishes E1 and changes from high to low, and the value of the E1 of correspondence is designated as Vd during comparator 1 action; Establish E1 again and change from low to high, the value of the E1 of correspondence is designated as Vc during comparator 2 actions; Vd and Vc promptly are respectively over threshold values and additives for overcharge protection threshold values.If a reference source voltage voltage Vref1 between Vton (cut-in voltage of NMOS pipe) and Vd, i.e. Vton＜Vref1＜Vd, then this at present two formulas set up:
Rc/(Ra+Rb+Rc)＝Vrer1/Vc……………………………(1)
(Rb+Rc)/(Ra+Rb+Rc)＝Vref1/Vd………………………(2)
Wherein, Rb=Rb1+Rb2+Rb3+ ... + Rb (i-1)+Rbi (2＜i＜100)
Get by above two formulas:
Rb/Rc=(Vc-Vd)/Vd=A (constant) ... (3)
Ra＝(Vd-Vref1)*(Rb+Rc)/Vref1…………………………(4)
Determine Rc=x
Rb＝Ax
By (3), (4) formula as can be seen, obtain required threshold voltage, only need to be according to Vref1 adjustment Ra value:
Ra＝(Vd-Vref1)*(A+1)x/Vref1……………………………(5)
In the formula (5), the over threshold values that Vd sets for the user, Vref1 is a reference source voltage actual value that measures behind the protective circuit chip power, and A is the proportionality constant of Rb and Rc, and x is the design resistance (or number formulary) of Rc.
2. overcurrent test section:
In this section in the circuit, we adopt several comparators (U1, U2 ..., Ui-1) the MOS switching tube of cooperation respective amount is adjusted a reference source voltage Vref2 of overcurrent protection comparator 5.Resistance is very low during wherein MOS switching tube conducting, is connected across its source and leaks the resistance at two ends and be equivalent to by short circuit.
The design of over-current detection a reference source voltage Vref2:
If the protective circuit chip operating voltage is V
CC, and Vd＜V
CC＜Vc is then at V
CCDrop to the Vd process from Vc, comparator (U1, U2 ..., Ui-1) in chronological sequence action successively; At V
CCRise to the Vc process from Vd, comparator (U1, U2 ..., Ui-1) order of in chronological sequence moving then just conversely.
If R
Up=R
1+ R
2+ R
3+ ... + R
n,
R
down＝R
n+1+R
n+2
Then:
Vref2＝(E
3-E
4)*R
down/(R
up+R
down)…………………………(6)
In the reality, (E3-E4) variation with protective circuit operating voltage Vcc changes, and variation tendency is identical; And the variation of Vref2 then is decided by the variation of (E3-E4) under the constant situation of divider resistance ratio Rdown/ (Rup+Rdown), and variation tendency unanimity.So if Rdown/ (Rup+Rdown) is constant, then Vref2 changes with Vcc, and the change direction unanimity.
When (E3-E4) when high direction changes (Vcc changes from low to high),
The switching tube of control Rup turn-offs along with the low control level of respective comparator output, so Rup becomes greatly; And the switching tube state of control Rdown is just opposite, so Rdown is constant or diminish, thereby Rdown/ (Rup+Rdown) diminishes;
When (E3-E4) when low direction changes (Vcc changes from high to low),
R
UpDiminish R
DownConstant or become big, thus R
Down/ (R
Up+ R
Down) become big;
In above two kinds of situations, (E
3-E
4) and R
Down/ (R
Up+ R
Down) variation tendency all just in time opposite, thereby guaranteed in the normal working voltage scope value that Vref2 keeps relative stability
In Fig. 1, the voltage and a reference source voltage Vref1 that obtain in the sample resistance 3 of overdischarge detection comparator 1 with cell voltage make comparisons, if the former is lower than the latter, then drive logic control and level shifting circuit 7 from Dout end output low level, cut off discharge loop; Voltage and a reference source voltage Vref1 that obtains in the sample resistance 3 of detection comparator 2 with cell voltage that overcharge makes comparisons, if the former is higher than the latter, then drives logic control and level shifting circuit 7 from Cout end output low level, cuts off charge circuit; The sample resistance 3 of the reference voltage deriving means 4 matching battery voltages of over-current detection comparator can be metastable reference voltage V ref2 of over-current detection comparator 5 outputs; If overcurrent and short-circuit detecting device 6 detected voltages are higher than Vref2, then 5 driving logic controls of over-current detection comparator and level shifting circuit 7 cut off discharge loop from the Dout output low level.
In the circuit of Fig. 1; need not adjust a reference source voltage Vref1; but the Vref1 that arrives according to actual measurement; calculate the resistance value Ra of required adjustment; the method of blowing fusible link by electric current obtains resistance Ra again, to realize once adjusting the purpose of additives for overcharge protection threshold values and over threshold values and overcurrent protection threshold values
Fig. 2 is that Vref2 is with supply voltage V
CCChange curve, wherein, (1) is V
CCChange curve, (2) are that Vref2 is with V
CCChange curve.When the divided hop count of Rb is many more, the error of Vref2 is just more little, and promptly the serrated portion in (2) is just level and smooth more.
Claims (6)
1. the adjusting device of lithium battery protection circuit protection threshold values is characterized in that it comprises:
The sample resistance of cell voltage (3);
Overdischarge detection comparator (1), two input are connected respectively to the sample resistance (3) and the first a reference source voltage Vref1 of described cell voltage, and produce first output signal;
The detection comparator (2) that overcharges, two input is connected respectively to the sample resistance (3) and the first a reference source voltage Vref1 of described cell voltage, and produces second output signal;
Reference voltage deriving means (4), the sample resistance of its matching battery voltage (3) produces the second a reference source voltage Vref2;
Over-current detection comparator (5), two input connect the second a reference source voltage Vref2 and overcurrent and the short-circuit detecting device (6) that reference voltage deriving means (4) produces respectively, and produce the 3rd output signal;
Logic control and level shifting circuit (7), it receives first output signal, second output signal and the 3rd output signal, and produces an output signal at one of them output of two output.
2. protect the adjusting device of threshold values according to the described lithium battery protection circuit of claim 1; it is characterized in that: described sample resistance (3) is composed in series by adjustable resistance Ra and resistance R b, Rc; Rb is by i resistance R b1, Rb2 ... Rbi (2＜i＜100) forms, and the detection of overcharging, overdischarge detect to be used with a string sample resistance (3).
3. protect the adjusting device of threshold values according to the described lithium battery protection circuit of claim 2; it is characterized in that: the resistance of Ra is determined by the first a reference source voltage Vref1 that actual measurement obtains; and only need adjust the resistance of Ra, can make additives for overcharge protection threshold values and over threshold values obtain adjusting simultaneously.
4. according to the adjusting device of the described described lithium battery protection circuit protection threshold values of claim 1 or claim 2; it is characterized in that: when adjusting additives for overcharge protection threshold values and over threshold values by adjusting the Ra resistance; the reference voltage deriving means (4) that cooperates the over-current detection comparator can obtain second a reference voltage V ref2 who meets required precision.
5. the adjusting device of described lithium battery protection circuit protection threshold values according to claim 1; it is characterized in that: a reference source voltage Vref2 in the reference voltage deriving means (4) of over-current detection comparator both can receive the input in the same way of comparator, also can receive reverse input end.
6. the adjusting device of described lithium battery protection circuit protection threshold values according to claim 1; it is characterized in that: the reference voltage deriving means (4) of over-current detection comparator comprises that i-1 comparator is connected in parallel on resistance R b1, Rb2 ... between Rbi; the output of each comparator connects the grid of a MOS (metal-oxide-semiconductor) transistor respectively; is connected a resistance between the source electrode of each MOS (metal-oxide-semiconductor) transistor and drain electrode, each resistance is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031267998A CN1248352C (en) | 2003-06-06 | 2003-06-06 | Adjuster for lithium cell protective circuit protective threshold value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031267998A CN1248352C (en) | 2003-06-06 | 2003-06-06 | Adjuster for lithium cell protective circuit protective threshold value |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1553540A CN1553540A (en) | 2004-12-08 |
| CN1248352C true CN1248352C (en) | 2006-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031267998A Expired - Lifetime CN1248352C (en) | 2003-06-06 | 2003-06-06 | Adjuster for lithium cell protective circuit protective threshold value |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420113C (en) * | 2005-06-17 | 2008-09-17 | 华为技术有限公司 | Overcurrent protection circuit |
| CN1979992A (en) | 2005-12-07 | 2007-06-13 | 比亚迪股份有限公司 | Charge-discharge protection circuit of secondary cell group |
| US7286010B2 (en) * | 2006-01-26 | 2007-10-23 | D2Audio Corporation | Systems and methods for over-current protection |
| JP4820739B2 (en) * | 2006-12-07 | 2011-11-24 | オンセミコンダクター・トレーディング・リミテッド | Battery voltage detection circuit |
| CN102076139B (en) * | 2009-11-19 | 2013-12-11 | 群康科技(深圳)有限公司 | LED lighting circuit |
| CN102593898B (en) * | 2012-02-17 | 2014-08-20 | 江苏博强新能源科技有限公司 | Lithium cell management system |
| CN103592505A (en) * | 2013-11-29 | 2014-02-19 | 深圳市航盛电子股份有限公司 | Self-protective voltage detection circuit |
| CN103995175A (en) * | 2014-06-04 | 2014-08-20 | 安徽江淮汽车股份有限公司 | Over-current detecting circuit |
| CN110015135A (en) * | 2017-09-22 | 2019-07-16 | 江苏智谋科技有限公司 | The battery management system and protection system of electric car |
| CN108153185A (en) * | 2017-12-06 | 2018-06-12 | 欣旺达电子股份有限公司 | Programmable Li battery protection IC |
| CN108443817A (en) * | 2018-05-15 | 2018-08-24 | 广东工业大学 | A kind of energy-saving LED device with thermoelectric generation film |
| CN109188309B (en) * | 2018-10-15 | 2020-08-18 | 中国船舶重工集团公司第七0五研究所 | Method for accurately determining dynamic threshold parameters of high-voltage detonator detection circuit |
| CN114256894B (en) * | 2020-09-23 | 2023-05-16 | 圣邦微电子（北京）股份有限公司 | Charging management circuit and chargeable electronic device |
| CN113285600B (en) * | 2021-07-26 | 2021-11-05 | 广东伊之密精密机械股份有限公司 | Voltage self-adaptation circuit and PLC controller |
-
2003
- 2003-06-06 CN CNB031267998A patent/CN1248352C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1553540A (en) | 2004-12-08 |
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Effective date of registration: 20160705 Address after: 210000 No. 99 Huai Hai Road, Lishui Economic Development Zone, Nanjing, Jiangsu Patentee after: NANJING BYD AUTOMOBILE Co.,Ltd. Address before: Kwai Chung town Yanan Road, BYD Industrial Park in Longgang District of Shenzhen City, Guangdong province 518119 Patentee before: BYD Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20060329 |
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