JP2002243771A - Battery voltage detecting circuit - Google Patents
Battery voltage detecting circuitInfo
- Publication number
- JP2002243771A JP2002243771A JP2001039081A JP2001039081A JP2002243771A JP 2002243771 A JP2002243771 A JP 2002243771A JP 2001039081 A JP2001039081 A JP 2001039081A JP 2001039081 A JP2001039081 A JP 2001039081A JP 2002243771 A JP2002243771 A JP 2002243771A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- battery
- circuit
- battery voltage
- differential amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は二次電池のバッテリ
ーパックにおいて、電圧や充放電電流などのバッテリー
状態監視が要求される回路と該バッテリー状態監視回路
とバッテリー装置外への外部接続端子とスイッチ素子と
二次電池とセンス抵抗とを含むバッテリー装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for a battery pack of a secondary battery, which requires monitoring of a battery state such as a voltage and a charging / discharging current. The present invention relates to a battery device including an element, a secondary battery, and a sense resistor.
【０００２】[0002]
【従来の技術】従来の電池電圧検出回路としては、図３
に回路ブロック図で示すような回路が知られていた。こ
のような回路において、二次電池３０１，３０２の各電
池電圧を検出し、マイコンのアナログ−デジタル変換入
力端子に対し端子３１１にアナログ信号として出力す
る。二次電池３０１，３０２に接続された端子３１１，
３１２，３１３に印加された電圧をスイッチ回路３０３
により信号線３０９，３１０に切り替え、差動増幅回路
３１４の入力とする。その際の差動増幅回路３１４は、
３０９，３１０間の電位差をアナログ出力端子３００の
電位とGND電位との電位差に変換し、アナログ出力端子
３００にアナログ信号として出力する。スイッチ３１６
とスイッチ３１７をONし、スイッチ回路３０３のその他
のスイッチをOFFし、差動増幅回路３１５の入力信号３
０９，３１０に電池３０１の負端子電圧を印加する。そ
の際のアナログ出力端子３００には、二次電池３０１測
定時における差動増幅回路３１４自身のオフセット電圧
とオフセット調整用電圧源３１５の電圧を加算した電圧
Aが出力されることになる。次にスイッチ３１６，３１
８をONし、スイッチ回路３０３のその他のスイッチをOF
Fすることで、差動増幅回路３１４には電池３０１の両
端電圧が入力される。その際のアナログ出力端子３００
には、電池３０１電圧と差動増幅回路３１４自身のオフ
セット電圧、およびオフセット調整用電圧源３１５の電
圧を加算した電圧Bが出力されることになる。電池電圧
を高精度で検出するために、誤差成分であるオフセット
電圧Aを出力し、次にオフセット電圧を含んだ電池電圧B
を出力する。出力されたアナログ信号である電圧値をマ
イコンによりアナログ−デジタル変換した後、電圧B−
電圧Aをマイコンにて演算する。この演算により差動増
幅器自身のオフセットによる誤差成分を含まない二次電
池３０１の電池電圧を検出することが出来る。2. Description of the Related Art As a conventional battery voltage detecting circuit, FIG.
A circuit as shown in a circuit block diagram has been known. In such a circuit, the respective battery voltages of the secondary batteries 301 and 302 are detected and output as analog signals to a terminal 311 to an analog-digital conversion input terminal of the microcomputer. Terminals 311, connected to secondary batteries 301, 302
The voltage applied to 312 and 313 is
To switch to the signal lines 309 and 310 to input the differential amplifier circuit 314. At that time, the differential amplifier circuit 314
The potential difference between 309 and 310 is converted into a potential difference between the potential of the analog output terminal 300 and the GND potential, and output to the analog output terminal 300 as an analog signal. Switch 316
And the switch 317 are turned on, and the other switches of the switch circuit 303 are turned off.
09, 310 is applied with the negative terminal voltage of the battery 301. At this time, the analog output terminal 300 has a voltage obtained by adding the offset voltage of the differential amplifier circuit 314 itself and the voltage of the offset adjustment voltage source 315 when the secondary battery 301 is measured.
A will be output. Next, switches 316 and 31
8 is turned on, and the other switches of the switch circuit 303 are turned off.
By performing F, the voltage across the battery 301 is input to the differential amplifier circuit 314. Analog output terminal 300 at that time
The voltage B is obtained by adding the voltage of the battery 301, the offset voltage of the differential amplifier circuit 314 itself, and the voltage of the offset adjustment voltage source 315. To detect the battery voltage with high accuracy, the offset voltage A, which is an error component, is output, and then the battery voltage B including the offset voltage is output.
Is output. After the analog-to-digital conversion of the output analog signal voltage value by the microcomputer, the voltage B-
The voltage A is calculated by the microcomputer. By this calculation, the battery voltage of the secondary battery 301 that does not include an error component due to the offset of the differential amplifier itself can be detected.
【０００３】同様にスイッチ３１８とスイッチ３１９を
ONし、スイッチ回路３０３のその他のスイッチをOFFす
ることで、差動増幅回路３１４の入力信号３０９，３１
０には電池３０２の負端子電圧を印加される。その際の
アナログ出力端子３００には、二次電池３０２測定時の
差動増幅回路３１４自身のオフセット電圧とオフセット
調整電圧源３１５の電圧を加算した電圧Cが出力される
ことになる。次にスイッチ３１９，３２０をONし、その
他のスイッチをOFFすることで、差動増幅回路３１４に
は電池３０２の両端電圧が入力される。その際のアナロ
グ出力端子３００には、電池３０２電圧と差動増幅回路
３１４自身のオフセット電圧、およびオフセット調整電
圧源３１５の電圧を加算した電圧Dが出力されることに
なる。そして電圧D−電圧Cを演算する。この演算により
差動増幅器自身のオフセットによる誤差成分を含まない
二次電池３０２の電池電圧を検出することが出来る。ま
た、図４に示すようにスイッチを増やし、電池の接続を
そのスイッチにより切り替えることで、直列に接続され
たN個の二次電池の電圧を、一つの作動増幅回路３１４
で検出することが可能となる。Similarly, switch 318 and switch 319
When the other switches of the switch circuit 303 are turned on and the other switches of the switch circuit 303 are turned off, the input signals 309 and 31 of the differential amplifier circuit 314 are changed.
To 0, the negative terminal voltage of the battery 302 is applied. At this time, a voltage C obtained by adding the offset voltage of the differential amplifier circuit 314 itself and the voltage of the offset adjustment voltage source 315 at the time of measurement of the secondary battery 302 is output to the analog output terminal 300. Next, by turning on the switches 319 and 320 and turning off the other switches, the voltage between both ends of the battery 302 is input to the differential amplifier circuit 314. At this time, a voltage D obtained by adding the voltage of the battery 302, the offset voltage of the differential amplifier circuit 314 itself, and the voltage of the offset adjustment voltage source 315 is output to the analog output terminal 300. Then, voltage D−voltage C is calculated. By this calculation, the battery voltage of the secondary battery 302 that does not include an error component due to the offset of the differential amplifier itself can be detected. Also, as shown in FIG. 4, the number of switches is increased, and the connection of the batteries is switched by the switches, so that the voltages of the N rechargeable batteries connected in series can be reduced by one operation amplifier circuit 314.
Can be detected.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、リチウ
ムイオン二次電池の場合、使用電圧範囲は２Vから５V程
度であるため差動増幅回路３１４の増幅率が１倍であっ
た場合、電池電圧出力にはオフセット電圧を含んだ電圧
値が出力されるため、アナログ出力端子３００には最大
で５V以上の電圧が出力されることとなる。そのため５V
電源のマイコンで読み取りが不可能な場合が存在するこ
ととなる。現状では電池電圧が高い場合でも、差動増幅
回路３１４の増幅率を1倍以下に設定し、マイコンで読
み取り可能な範囲まで出力電圧を低下させて端子３００
に出力していた。この場合、マイコンで読み取った電圧
値を演算により元の電圧値に戻すため、マイコンでのア
ナログ−デジタル変換時の量子化誤差も差動増幅回路の
増幅率分の1倍されてしまい、電池電圧の読み取り誤差
が大きくなるという問題が存在した。However, in the case of a lithium ion secondary battery, the operating voltage range is about 2 V to 5 V. Therefore, when the amplification factor of the differential amplifier circuit 314 is 1, the battery voltage output is reduced. Since a voltage value including an offset voltage is output, a voltage of 5 V or more is output to the analog output terminal 300 at the maximum. Therefore 5V
In some cases, reading by the power supply microcomputer is impossible. At present, even if the battery voltage is high, the amplification factor of the differential amplifier circuit 314 is set to 1 or less, and the output voltage is reduced to a range that can be read by the microcomputer, and the terminal 300 is turned off.
Was output to. In this case, since the voltage value read by the microcomputer is returned to the original voltage value by calculation, the quantization error at the time of analog-digital conversion by the microcomputer is also multiplied by one times the amplification factor of the differential amplifier circuit, and the battery voltage is reduced. There is a problem that the reading error of the image becomes large.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明はオフセット調整用電源を別に用意し、測定
した電池電圧からオフセット調整用電圧を減算してアナ
ログ端子に出力する様にした。電池電圧を測定する際
に、読み取りに必要のない一定電圧以下の電圧を電池電
圧から減算を行うことで、出力されるアナログ信号電圧
を低くすることが可能となる。それにより、読み取り側
のマイコンの電圧を低くすることが可能となり、マイコ
ンの消費電流を低く抑えることが可能となる。また、電
池電圧，オフセット調整電圧および差動増幅器自身のオ
フセット電圧を同一の差動増幅器を用い出力すること
で、マイコンでの演算により誤差成分である差動増幅器
自身のオフセット電圧を取り除くことが可能となり、電
池電圧を高精度で検出できる様にした。In order to solve the above-mentioned problems, the present invention separately prepares an offset adjusting power supply, subtracts the offset adjusting voltage from the measured battery voltage, and outputs the result to the analog terminal. . When the battery voltage is measured, the analog signal voltage to be output can be reduced by subtracting a voltage that is not necessary for reading and equal to or lower than a certain voltage from the battery voltage. As a result, the voltage of the microcomputer on the reading side can be reduced, and the current consumption of the microcomputer can be reduced. In addition, by using the same differential amplifier to output the battery voltage, offset adjustment voltage, and offset voltage of the differential amplifier itself, it is possible to remove the offset voltage of the differential amplifier itself, which is an error component, by calculation in the microcomputer. , So that the battery voltage can be detected with high accuracy.
【０００６】[0006]
【発明の実施の形態】上記の様に構成された電池電圧検
出回路においては、差動増幅器の増幅率を１倍に設定し
ても、電池電圧検出に必要のない２V以下の電圧をオフ
セット調整用電圧として、入力された電池電圧から減算
してマイコンに出力するため、５Vの電池をモニタした
場合でもアナログ出力端子電圧は３V程度となる。この
ように出力電圧が低くなるためマイコンの電源電圧を下
げても検出することが可能となり、マイコンの消費電流
を低く抑えることが可能となる。また、差動増幅回路の
増幅率は1倍であるためアナログ−デジタル変換時の量
子化誤差が大きくなることもない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a battery voltage detecting circuit configured as described above, even if the amplification factor of a differential amplifier is set to 1, a voltage of 2 V or less that is unnecessary for battery voltage detection is offset adjusted. Since the output voltage is subtracted from the input battery voltage and output to the microcomputer, the analog output terminal voltage is about 3 V even when a 5 V battery is monitored. Since the output voltage is reduced as described above, it is possible to detect even if the power supply voltage of the microcomputer is lowered, and it is possible to suppress the current consumption of the microcomputer. Further, since the amplification factor of the differential amplifier circuit is 1, the quantization error at the time of analog-digital conversion does not increase.
【０００７】[0007]
【実施例】以下にこの発明の実施例を図１に基づいて説
明する。図１は、本発明を含む電池電圧検出回路の回路
ブロック図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a circuit block diagram of a battery voltage detection circuit including the present invention.
【０００８】まず、電池電圧検出回路の回路構成を図１
に基づいて説明する。直列に接続された二次電池１０
１，１０２の負端子を１１２端子に、正端子を１１４端
子に、電池の中点を１１３端子にそれぞれ接続する。そ
してスイッチ回路１０３に内臓されるスイッチ１２１か
ら１２５までの各スイッチのＯＮ，ＯＦＦを切り替える
ことで、差動増幅回路１１５の入力１１０，１１１に各
二次電池１０１，１０２の負端子電圧、両端電圧を印加
できるように接続する。また、作動増幅回路の加算端子
に接続される信号線１１２には、スイッチ１１９，１２
０によりGND電位またはオフセット調整用電源１１８の
電圧を切り替えて入力できるように接続する。そして作
動増幅回路の減算端子に接続される信号線１１３には、
スイッチ１２１，１２２により、GND電位またはオフセ
ット調整用電源１１８の電圧を切り替えて入力できるよ
うに接続する。また、図２に示すように測定する二次電
池２０３と電池接続端子２１４を増やすことでN個の電
池を接続できる。First, the circuit configuration of the battery voltage detection circuit is shown in FIG.
It will be described based on. Secondary battery 10 connected in series
The negative terminal of 1,102 is connected to the 112 terminal, the positive terminal is connected to the 114 terminal, and the midpoint of the battery is connected to the 113 terminal. By switching ON and OFF of each of the switches 121 to 125 included in the switch circuit 103, the negative terminal voltage of each of the secondary batteries 101 and 102 and the voltage between both terminals are applied to the inputs 110 and 111 of the differential amplifier circuit 115. Is connected so that can be applied. Switches 119 and 12 are connected to the signal line 112 connected to the addition terminal of the operational amplifier circuit.
The connection is made such that the GND potential or the voltage of the offset adjustment power supply 118 can be switched and input according to 0. The signal line 113 connected to the subtraction terminal of the operational amplifier circuit has
The switches 121 and 122 are connected so that the GND potential or the voltage of the offset adjustment power supply 118 can be switched and input. Also, as shown in FIG. 2, N batteries can be connected by increasing the number of secondary batteries 203 and battery connection terminals 214 to be measured.
【０００９】そして電池電圧検出回路の動作を図１に基
づいて説明する。スイッチ１２３とスイッチ１２４をON
し、スイッチ回路１０３のその他のスイッチをOFFする
ことで、差動増幅回路１１７の入力信号１１０，１１１
に電池１０１の負端子電圧が印加される。また、スイッ
チ１１９，１２１をONし、スイッチ１２０，１２２をOF
Fすることでアナログ出力端子１００には、二次電池１
０１測定時における差動増幅回路１１７自身のオフセッ
ト電圧Eが出力されることになる。次にその状態からス
イッチ１１９をOFFし、スイッチ１２０をONすることで
差動増幅回路１１７の加算端子にオフセット調整用電圧
源１１８の電圧が印加される。その際、アナログ出力端
子１００には差動増幅回路１１７自身のオフセット電圧
とオフセット調整電圧源１１８の電圧を加算した電圧F
が出力されることになる。その後、スイッチ回路１０３
内のスイッチ１２３，１２６をONし、その他のスイッチ
をOFFすることで差動増幅回路１１７には電池１０１の
両端電圧が入力される。さらにスイッチ１１９，１２２
をONし、スイッチ１２０，１２１をOFFすることで、ア
ナログ出力端子１００には、電池１０１電圧とオフセッ
ト調整電圧源１１８との電位差に、差動増幅回路１１７
自身のオフセット電圧Eを含んだ電圧Gが出力される。電
池電圧を高精度で検出するために、まず誤差成分である
オフセット電圧Eを出力する。次にオフセット調整用電
圧源にオフセット電圧Eを含んだオフセット調整電圧Fを
出力する。その後電池１０１電圧とオフセット調整用電
圧源１１８の電位差にオフセット電圧Eを含んだ電池測
定電圧Gを出力する。これら電圧E，F，Gをマイコンでア
ナログ−デジタル変換した後、電圧G＋電圧F−（電圧E
×２）を演算することで、二次電池１０１の電池電圧を
高精度で検出することが出来る。二次電池１０２につい
ても同様にスイッチ制御を行うことで二次電池１０２の
電池電圧を高精度で検出することが出来る。そして、こ
の測定の際に、従来の方式ではアナログ出力端子に電池
電圧にオフセット調整用電圧を加算した値が出力されて
いたが、本方式にすることでアナログ出力端子には電池
電圧からオフセット調整用電圧を減算した値が出力され
る。そのためアナログ出力端子の最大電圧を電池電圧以
下に抑えることが可能となる。それにより読み取り側の
マイコンの電源電圧も低く抑えることが可能となりマイ
コンの消費電流を低減することが可能となる。また、図
２に示すようにスイッチを増やし電池の接続をスイッチ
により切り替えることで、直列に接続されたN個の二次
電池の電圧を一つの作動増幅回路１１７で検出すること
が可能となる。The operation of the battery voltage detecting circuit will be described with reference to FIG. Turn on switch 123 and switch 124
Then, by turning off the other switches of the switch circuit 103, the input signals 110 and 111 of the differential amplifier circuit 117 are turned off.
To the negative terminal voltage of the battery 101. Further, the switches 119 and 121 are turned on, and the switches 120 and 122 are turned off.
By pressing F, the secondary battery 1 is connected to the analog output terminal 100.
The offset voltage E of the differential amplifier circuit 117 at the time of the 01 measurement is output. Next, from this state, the switch 119 is turned off and the switch 120 is turned on, so that the voltage of the offset adjusting voltage source 118 is applied to the addition terminal of the differential amplifier circuit 117. At this time, a voltage F obtained by adding the offset voltage of the differential amplifier circuit 117 itself and the voltage of the offset adjustment voltage source 118 is applied to the analog output terminal 100.
Is output. After that, the switch circuit 103
By turning on the switches 123 and 126 and turning off the other switches, the voltage across the battery 101 is input to the differential amplifier circuit 117. Further, switches 119 and 122
Is turned on and the switches 120 and 121 are turned off, the differential output circuit 117 receives the potential difference between the battery 101 voltage and the offset adjustment voltage source 118 at the analog output terminal 100.
A voltage G including its own offset voltage E is output. To detect the battery voltage with high accuracy, first, an offset voltage E, which is an error component, is output. Next, an offset adjustment voltage F including the offset voltage E is output to the offset adjustment voltage source. Thereafter, a battery measurement voltage G including the offset voltage E in the potential difference between the voltage of the battery 101 and the offset adjustment voltage source 118 is output. After analog-to-digital conversion of these voltages E, F, and G by the microcomputer, voltage G + voltage F− (voltage E
X2), the battery voltage of the secondary battery 101 can be detected with high accuracy. By similarly performing switch control on the secondary battery 102, the battery voltage of the secondary battery 102 can be detected with high accuracy. At the time of this measurement, in the conventional method, a value obtained by adding the offset adjustment voltage to the battery voltage was output to the analog output terminal, but this method allows the analog output terminal to perform the offset adjustment from the battery voltage. The value obtained by subtracting the operating voltage is output. Therefore, the maximum voltage of the analog output terminal can be suppressed to the battery voltage or less. As a result, the power supply voltage of the microcomputer on the reading side can be suppressed low, and the current consumption of the microcomputer can be reduced. Further, as shown in FIG. 2, by increasing the number of switches and switching the connection of the batteries by the switches, it becomes possible to detect the voltage of the N secondary batteries connected in series with one operation amplifier circuit 117.
【００１０】[0010]
【発明の効果】本発明は、以上説明したようにマイコン
の電源電圧を下げることが可能となり、従来の電池電圧
検出回路に比較し低消費化が可能になる。また、差動増
幅回路の増幅率が1倍に出来るためアナログ−デジタル
変化時の量子化誤差の増加を押さえるという効果があ
る。According to the present invention, the power supply voltage of the microcomputer can be reduced as described above, and the power consumption can be reduced as compared with the conventional battery voltage detection circuit. Further, since the amplification factor of the differential amplifier circuit can be made one, there is an effect that an increase in quantization error at the time of analog-digital change is suppressed.
【図１】本発明の電池電圧検出回路の回路ブロックを示
した説明図である。FIG. 1 is an explanatory diagram showing a circuit block of a battery voltage detection circuit according to the present invention.
【図２】本発明の電池電圧検出回路の他の例を示す回路
ブロック図である。FIG. 2 is a circuit block diagram showing another example of the battery voltage detection circuit of the present invention.
【図３】従来の電池電圧検出回路の回路ブロックを示し
た説明図である。FIG. 3 is an explanatory diagram showing a circuit block of a conventional battery voltage detection circuit.
【図４】従来の電池電圧検出回路の他の例を示す回路ブ
ロック図である。FIG. 4 is a circuit block diagram showing another example of a conventional battery voltage detection circuit.
１００・・・アナログ出力端子 １０１，１０２・・・二次電池 １０３・・・スイッチ回路 １０４，１０５，１０６，１０７，１０８・・・差動増
幅率調整用抵抗素子 １０９・・・オペアンプ １１０，１１１，１１２，１１３・・・信号線 １１４，１１５，１１６・・・電池接続端子 １１７・・・差動増幅回路 １１８・・・オフセット調整電圧源 １１９，１２０，１２１，１２２・・・オフセット切り
替えスイッチ素子 １２３、１２４，１２５，１２６，１２７・・・電池接
続切り替えスイッチ素子 ２００・・・アナログ出力端子 ２０１，２０２，２０３・・・二次電池 ２０４・・・スイッチ回路 ２０５・・・オフセット調整電圧源 ２０６，２０７・・・信号線 ２０８，２０９，２１０，２１１・・・オフセット切り
替えスイッチ素子 ２１２，２１３，２１４，２１５・・・電池接続端子 ３００・・・アナログ出力端子 ３０１，３０２・・・二次電池 ３０３・・・スイッチ回路 ３０４，３０５，３０６，３０７・・・差動増幅率調整
用抵抗素子 ３０８・・・オペアンプ ３０９，３１０・・・信号線 ３１１，３１２，３１３・・・電池接続端子 ３１４・・・差動増幅回路 ３１５・・・オフセット調整電圧源 ３１６，３１７，３１８，３１９，３２０・・・電池接
続切り替えスイッチ素子 ４００・・・アナログ出力端子 ４０１，４０２，４０３・・・二次電池 ４０４・・・スイッチ回路 ４０５・・・オフセット調整電圧源 ４０６，４０７・・・信号線 ４０８，４０９，４１０，４１１・・・電池接続端子100: Analog output terminal 101, 102: Secondary battery 103: Switch circuit 104, 105, 106, 107, 108: Differential amplification factor adjusting resistor element 109: Operational amplifier 110, 111 , 112, 113 ... signal line 114, 115, 116 ... battery connection terminal 117 ... differential amplifier circuit 118 ... offset adjustment voltage source 119, 120, 121, 122 ... offset switching switch element 123, 124, 125, 126, 127 ... battery connection changeover switch element 200 ... analog output terminal 201, 202, 203 ... secondary battery 204 ... switch circuit 205 ... offset adjustment voltage source 206 , 207... Signal line 208, 209, 210, 211. Units 212, 213, 214, 215 Battery connection terminal 300 Analog output terminal 301, 302 Secondary battery 303 Switch circuit 304, 305, 306, 307 Differential amplification factor Adjusting resistance element 308 Operational amplifier 309, 310 Signal line 311, 312, 313 Battery connection terminal 314 Differential amplifier circuit 315 Offset adjustment voltage source 316, 317, 318, 319, 320: battery connection switch element 400: analog output terminal 401, 402, 403: secondary battery 404: switch circuit 405: offset adjustment voltage source 406, 407: signal Lines 408, 409, 410, 411 ... battery connection terminals
Claims (2)
路において、複数の電池をスイッチにより切り替えを行
い、各電池電圧の測定する際に同一の差動増幅器を用
い、オフセット調整用に用意した電源電圧値、差動増幅
器自身のオフセット電圧値、および差動増幅器に入力さ
れた電池電圧からオフセット調整用電圧源電圧を減算し
た電圧値の3状態の出力を切りかえる為のスイッチを有
し、出力された電圧値をアナログ信号としてマイコンに
出力し、その電圧値をマイコンにより演算することで電
池電圧を高精度で検出することを特徴とした回路。1. A circuit for detecting a chargeable / dischargeable secondary battery voltage, wherein a plurality of batteries are switched by a switch, and the same differential amplifier is used when measuring each battery voltage, and is prepared for offset adjustment. A power supply voltage value, an offset voltage value of the differential amplifier itself, and a switch for switching the three-state output of a voltage value obtained by subtracting the offset adjustment voltage source voltage from the battery voltage input to the differential amplifier, A circuit that outputs the output voltage value to a microcomputer as an analog signal, and calculates the voltage value by the microcomputer to detect the battery voltage with high accuracy.
要のない一定電圧以下の電圧にオフセット調整用電圧を
設定することで、検出しようとする二次電池電圧からオ
フセット調整用電圧を減算することにより、本回路から
の出力電圧を低くすることが可能となり、その出力を読
み取るためのマイコンの電源電圧も低くすることが可能
となり、マイコンの消費電流を抑えることを特徴とした
回路。2. An offset adjustment voltage is subtracted from a secondary battery voltage to be detected by setting the offset adjustment voltage to a voltage that is not more than a certain voltage that does not need to be detected in the secondary battery to be detected. This makes it possible to lower the output voltage from this circuit, lower the power supply voltage of the microcomputer for reading the output, and reduce the current consumption of the microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001039081A JP2002243771A (en) | 2001-02-15 | 2001-02-15 | Battery voltage detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001039081A JP2002243771A (en) | 2001-02-15 | 2001-02-15 | Battery voltage detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002243771A true JP2002243771A (en) | 2002-08-28 |
Family
ID=18901946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001039081A Withdrawn JP2002243771A (en) | 2001-02-15 | 2001-02-15 | Battery voltage detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002243771A (en) |
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| JP2007274748A (en) * | 2006-03-30 | 2007-10-18 | Fujitsu Ltd | Circuit and method for controlling power supply device |
| JP2008145180A (en) * | 2006-12-07 | 2008-06-26 | Sanyo Electric Co Ltd | Battery voltage detection circuit |
| JP2008232735A (en) * | 2007-03-19 | 2008-10-02 | Sanyo Electric Co Ltd | Battery voltage detection circuit |
| JP2009063511A (en) * | 2007-09-07 | 2009-03-26 | Sanyo Electric Co Ltd | Battery voltage detection circuit |
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| KR100982597B1 (en) * | 2008-01-23 | 2010-09-15 | 산요 세미컨덕터 컴퍼니 리미티드 | Battery voltage detecting circuit |
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2001
- 2001-02-15 JP JP2001039081A patent/JP2002243771A/en not_active Withdrawn
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| US7696725B2 (en) | 2003-06-19 | 2010-04-13 | O2Micro International Limited | Battery cell monitoring and balancing circuit |
| US8836290B2 (en) | 2003-06-19 | 2014-09-16 | O2Micro International Limited | Battery cell monitoring and balancing circuit |
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| US8872478B2 (en) | 2010-03-09 | 2014-10-28 | O2Micro Inc. | Circuit and method for balancing battery cells |
| JP2011237266A (en) * | 2010-05-10 | 2011-11-24 | Denso Corp | Cell voltage detection device |
| JP2012095436A (en) * | 2010-10-26 | 2012-05-17 | Lapis Semiconductor Co Ltd | Semiconductor circuit, semiconductor device, fault diagnosis method for wiring, and fault diagnostic program |
| CN103178305A (en) * | 2011-12-21 | 2013-06-26 | 北京科易动力科技有限公司 | Smart battery |
| CN103178305B (en) * | 2011-12-21 | 2016-07-13 | 北京科易动力科技有限公司 | Intelligent battery |
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