JP3572193B2 - Battery potential difference conversion circuit - Google Patents

Battery potential difference conversion circuit Download PDF

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Publication number
JP3572193B2
JP3572193B2 JP10455798A JP10455798A JP3572193B2 JP 3572193 B2 JP3572193 B2 JP 3572193B2 JP 10455798 A JP10455798 A JP 10455798A JP 10455798 A JP10455798 A JP 10455798A JP 3572193 B2 JP3572193 B2 JP 3572193B2
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Prior art keywords
potential difference
switch circuit
battery
switch
circuit
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JPH11299118A (en
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秀之 木原
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

【０００１】
【発明の属する技術分野】
この発明は、電気自動車ならびに携帯機器やパーソナルコンピュータ等に内蔵される二次電池を使用したバッテリユニットの制御回路等に適用される電池電位差変換回路に関するものである。
【０００２】
【従来の技術】
図２は二次電池を使用したバッテリユニットの制御回路において、３セル直列接続された各二次電池の電位差を各々接地電位を基準として１セル毎に変換して出力する電池電位差変換回路の従来例である。図２においてＶＡ，ＶＢ，ＶＣはそれぞれ二次電池を示し、出力部Ｖに１セル毎の電位が出力され、１ｂ、２ｂ、３ｂ、４ｂ、５ｂ、６ｂ、７ｂは導通状態と解放状態を実現するスイッチ回路である。
【０００３】
図２において、二次電池ＶＣの電位差を出力するにはスイッチ回路１ｂ、４ｂのみを導通状態にして、コンデンサＣに二次電池ＶＣの電圧を充電する。その後スイッチ回路１ｂ、４ｂを再び解放状態にしたあと、スイッチ回路７ｂを導通状態にすることにより出力部Ｖに接地電位を基準として二次電池ＶＣの電位を出力することができる。同様に二次電池ＶＢの電位差を出力するにはスイッチ回路２ｂ、５ｂのみを導通状態にして、コンデンサＣに二次電池ＶＢの電圧を充電する。その後スイッチ回路２ｂ、５ｂを解放状態にした後、スイッチ回路７ｂを導通状態にすることにより出力部Ｖに接地電位を基準として二次電池ＶＢの電位を出力することができる。二次電池ＶＡの電位差も同様な方法により出力部Ｖに出力することができる。
【０００４】
【発明が解決しようとする課題】
従来、バッテリユニットに使用している各二次電池の電位差を各々接地電位を基準として１セル毎に変換して出力する電池電位差変換回路においては、使用するスイッチ回路に高電圧が印加されるため、高い電気的耐圧のスイッチ回路が必要になるという課題があった。
【０００５】
すなわち、図２において二次電池ＶＡ、ＶＢ、ＶＣが４．１Ｖのリチウムイオン二次電池の場合に、二次電池ＶＣの電位差を出力するため、スイッチ回路１ｂ、４ｂのみを導通状態にすると、解放状態のスイッチ回路３ｂおよび６ｂ、７ｂは、それぞれ二次電池ＶＢ＋ＶＣ、二次電池ＶＡ＋ＶＢの２セル分の電位差、すなわち８．２Ｖが印加されるため、３セル直列接続された各二次電池の電位差を、各々接地電位を基準として１セル毎に変換して出力する電位差変換回路を構成するスイッチ回路は、少なくとも２セル分以上の電気的耐圧が必要であった。
【０００６】
したがって、ｎ（ｎ＞３）セルの直列接続された二次電池の電位差変換回路において構成するスイッチ回路は、少なくともｎ−１セル分以上の電気的耐圧が必要となり、例えば、４．１Ｖのリチウムイオン二次電池で、ｎ＝１１セルが直列接続された場合には、電位差変換回路を構成するスイッチ回路の電気的耐圧は少なくとも４１Ｖ必要であり、スイッチ回路の構成が非常に困難であった。
【０００７】
この発明は、上記従来の課題を解決するものであり、例えばバッテリユニットに使用している直列接続された各二次電池の電位差を各々接地電位を基準として１セル毎に変換して出力する電位差変換回路において、低い電気的耐圧のスイッチ回路を用いて実現することができる電池電位差変換回路を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１記載の電池電位差変換回路は、複数個直列接続された電池群と、直列接続されて電池群の少なくとも一つの電池に並列に接続された一対のスイッチ回路と、この一対のスイッチ回路の相互の接続点を第１電極側に接続したコンデンサと、このコンデンサの第２電極側を基準電位に接続する別のスイッチ回路とを備え、コンデンサの第２電極側の電位を出力電位としたものである。
【０００９】
請求項１記載の電池電位差変換回路によれば、一対のスイッチ回路の一方と別のスイッチ回路を閉じるとコンデンサが充電され、つぎにこれらのスイッチ回路を開いて一対のスイッチ回路の他方を閉じるとコンデンサの第２電極側に電池の電位が現れる。この場合、一対のスイッチ回路の一方と別のスイッチ回路を閉じたとき一対のスイッチ回路の他方には１つの電池の電位差のみが加わり、解放したときも同様である。つぎに一対のスイッチ回路の他方を閉じたとき一対のスイッチ回路の一方と別のスイッチ回路には１つの電池の電位差のみが印加される。このためスイッチ回路は従来例と比較して、電池の数にかかわらず、低い電気的耐圧のスイッチ回路を用いて、各二次電池の電位差を各々基準電圧に対し、１セル毎に変換して出力する電位差変換回路を簡単に実現することができる。
【００１０】
請求項２記載の電池電位差変換回路は、請求項１において、第１のスイッチ回路、第２のスイッチ回路および第３のスイッチ回路は、それぞれ第一導電形のＭＯＳトランジスタからなるものである。
請求項２記載の電池電位差変換回路によれば、請求項１と同様な効果がある。請求項３記載の電池電位差変換回路は、請求項１において、第１のスイッチ回路、第２のスイッチ回路および第３のスイッチ回路は、それぞれ第一導電形のＭＯＳトランジスタと第二導電形のＭＯＳトランジスタを並列に接続したトランスミッションゲートからなるものである。
【００１１】
請求項３記載の電池電位差変換回路によれば、請求項１と同様な効果がある。
【００１２】
【発明の実施の形態】
以下、この発明の実施の形態について、図面を参照しながら説明する。
図１はこの発明の一実施の形態における二次電池電位差変換回路である。図１において、ＶＡ、ＶＢ、ＶＣは例えば複数個直列接続される再充電可能な電池（以下、二次電池と称す）、具体的には各々４．１Ｖのリチウムイオン二次電池であり、ＶＲは接地電位から二次電池ＶＡの陰極側に生じている電位差であり、１、２、３、４、５、６、７、８、９、１０、１１、１２はそれぞれ導通状態と解放状態を実現するスイッチ回路である。またＣ１、Ｃ２、Ｃ３はそれぞれコンデンサである。
【００１３】
この二次電池電位差変換回路は、複数個直列接続された電池群ＶＡ、ＶＢ、ＶＣと、直列接続されて電池群ＶＡ、ＶＢ、ＶＣの各々に並列に接続された一対のスイッチ回路群すなわち一対のスイッチ回路１、２、一対のスイッチ回路３、４、一対のスイッチ回路５、６と、これらの一対のスイッチ回路の相互の接続点をそれぞれ第１電極側に接続したコンデンサＣ１、Ｃ２、Ｃ３と、このコンデンサＣ１、Ｃ２、Ｃ３の各第２電極側を基準電位に接続する別のスイッチ回路１０、１１、１２とを備え、コンデンサＣ１、Ｃ２、Ｃ３の第２電極側の電位を出力電位Ｖとしている。
【００１４】
実施の形態では二次電池ＶＡ，ＶＢ，ＶＣが３個直列に接続されており、二次電池ＶＣの陽極側にはスイッチ回路１が接続され、二次電池ＶＣの陰極側にはスイッチ回路２が接続されておりスイッチ回路１、２の出力は、コンデンサＣ１の片側の電極に接続されている。同様に二次電池ＶＢの陽極側にはスイッチ回路３が接続され、二次電池ＶＢの陰極側にはスイッチ回路４が接続されておりスイッチ回路３、４の出力は、コンデンサＣ２の片側の電極に接続されている。さらに二次電池ＶＡの陽極側にはスイッチ回路５が接続され、二次電池ＶＡの陰極側にはスイッチ回路６が接続されておりスイッチ回路５、６の出力は、コンデンサＣ３の片側の電極に接続されている。コンデンサＣ１、Ｃ２、Ｃ３の反対側の電極には接地用スイッチ回路１０、１１、１２および出力用スイッチ回路７、８、９が接続されている。Ｖは出力部であり、接地電位を基準として各ＶＡ、ＶＢ、ＶＣの電位差が出力される。
【００１５】
以上のように構成された二次電池電位差変換回路について、その動作を説明する。最初にスイッチ回路２、４、６およびスイッチ回路１０、１１、１２を、導通状態にしてコンデンサＣ１にＶＡ＋ＶＢ＋ＶＲの電圧を充電し、コンデンサＣ２にＶＡ＋ＶＲの電圧を充電し、コンデンサＣ３にＶＲの電圧を充電する。このとき解放状態にあるスイッチ類に印加されている電圧はつぎのようになる。
スイッチ回路１−−−−二次電池ＶＣの電位差
スイッチ回路３−−−−二次電池ＶＢの電位差
スイッチ回路５−−−−二次電池ＶＡの電位差
スイッチ回路７−−−−０Ｖ
スイッチ回路８−−−−０Ｖ
スイッチ回路９−−−−０Ｖ
次にすべてのスイッチ回路を解放状態にする。このときのスイッチ類に印加されている電圧はつぎのようになる。
スイッチ回路１−−−−二次電池ＶＣの電位差
スイッチ回路２−−−−０Ｖ
スイッチ回路３−−−−二次電池ＶＢの電位差
スイッチ回路４−−−−０Ｖ
スイッチ回路５−−−−二次電池ＶＡの電位差
スイッチ回路６−−−−０Ｖ
スイッチ回路７−−−−０Ｖ
スイッチ回路８−−−−０Ｖ
スイッチ回路９−−−−０Ｖ
スイッチ回路１０−−０Ｖ
スイッチ回路１１−−０Ｖ
スイッチ回路１２−−０Ｖ
この後に二次電池ＶＣの電位を出力する場合はスイッチ回路１、７を、二次電池ＶＢの電位を出力する場合はスイッチ回路３、８を、二次電池ＶＡの電位を出力する場合はスイッチ５、９を導通状態にすれば、各々の二次電池の電位差が接地電圧を基準としてＶに出力される。例えばスイッチ回路１、７を導通状態にした場合の他の解放状態のスイッチ類に印加されている電圧はつぎのようになる。
スイッチ回路２−−−−二次電池ＶＣの電位差
スイッチ回路３−−−−二次電池ＶＢの電位差
スイッチ回路４−−−−０Ｖ
スイッチ回路５−−−−二次電池ＶＡの電位差
スイッチ回路６−−−−０Ｖ
スイッチ回路８−−−−二次電池ＶＣの電位差
スイッチ回路９−−−−二次電池ＶＣの電位差
スイッチ回路１０−−二次電池ＶＣの電位差
スイッチ回路１１−−０Ｖ
スイッチ回路１２−−０Ｖ
したがって一連の電位差変換回路の動作において、構成されるすべてのスイッチ類には常に１セル分４．１Ｖの電位差が印加される。二次電池ＶＢの電位を出力するためにスイッチ回路３、８を、さらに二次電池ＶＡの電位を出力するためにスイッチ回路５、９を導通状態にした場合も同様に構成されるすべてのスイッチ類には常に１セル分の電位差が印加される。
【００１６】
以上のように、この発明の実施の形態によれば、複数個直列接続された二次電池において、複数個直列接続された二次電池群の少なくとも一つの二次電池の第１電極側と第２電極側の電位をそれぞれコンデンサの第１電極側に出力するスイッチ回路と、コンデンサの第２電極側の電位を基準電位に出力するスイッチ回路を備えることにより、低い電気的耐圧のスイッチ回路を用いて二次電池電位差変換回路を実現することができる。
【００１７】
なお、この実施の形態では、３個直列に接続された二次電池に対する電位差均等化回路の構成および動作を説明したが、３個以上に直列に接続された二次電池に対する電位差均等化回路を同様に構成しても、すべてのスイッチ類には常に１セル分の電位差が印加されるため、直列接続された二次電池の個数が増加するほどこの発明の効果が大きくなる。
【００１８】
またスイッチ回路１〜１２は、機械式あるいは電子式リレー装置が使用できる。
またスイッチ回路１〜１２は、それぞれ第一導電形のＭＯＳトランジスタ例えばＰ形ＭＯＳトランジスタ単体により構成することができる。
さらにスイッチ回路１〜１２は、それぞれ第一導電形のＭＯＳトランジスタと第二導電形のＭＯＳトランジスタを並列に接続したトランスミッションゲート、例えばＰ形ＭＯＳトランジスタとＮ形ＭＯＳトランジスタを並列に接続したトランスミッションゲート等が使用可能である。
【００１９】
また、この発明の電池電位差変換回路は、電池群の少なくとも一つの電池について電位差変換して出力するものであればよい。
【００２０】
【発明の効果】
請求項１記載の電池電位差変換回路によれば、一対のスイッチ回路の一方と別のスイッチ回路を閉じるとコンデンサが充電され、つぎにこれらのスイッチ回路を開いて一対のスイッチ回路の他方を閉じるとコンデンサの第２電極側に電池の電位が現れる。この場合、一対のスイッチ回路の一方と別のスイッチ回路を閉じたとき一対のスイッチ回路の他方には１つの電池の電位差のみが加わり、解放したときも同様である。つぎに一対のスイッチ回路の他方を閉じたとき一対のスイッチ回路の一方と別のスイッチ回路には１つの電池の電位差のみが印加される。このためスイッチ回路は従来例と比較して、電池の数にかかわらず、低い電気的耐圧のスイッチ回路を用いて、各二次電池の電位差を各々基準電圧に対し、１セル毎に変換して出力する電位差変換回路を簡単に実現することができる。
【００２１】
請求項２記載の電池電位差変換回路によれば、請求項１と同様な効果がある。請求項３記載の電池電位差変換回路によれば、請求項１と同様な効果がある。
【図面の簡単な説明】
【図１】この発明の一実施の形態における二次電池電位差変換回路図である。
【図２】従来の二次電池電位差変換回路図である。
【符号の説明】
ＶＡ，ＶＢ，ＶＣ 二次電池
１〜１２、１ｂ〜７ｂ スイッチ回路
Ｃ、Ｃ１、Ｃ２、Ｃ３ コンデンサ
Ｖ 各二次電池の接地電位に対する出力電圧の出力部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery potential difference conversion circuit applied to a control circuit of a battery unit using a secondary battery incorporated in an electric vehicle, a portable device, a personal computer, and the like.
[0002]
[Prior art]
FIG. 2 shows a conventional battery potential difference conversion circuit that converts a potential difference between three cells connected in series in a battery unit control circuit using a secondary battery for each cell with respect to a ground potential. It is an example. In FIG. 2, VA, VB, and VC denote secondary batteries, respectively, and the potential of each cell is output to the output unit V. 1b, 2b, 3b, 4b, 5b, 6b, and 7b realize a conductive state and a released state. Switch circuit.
[0003]
In FIG. 2, to output the potential difference of the secondary battery VC, only the switch circuits 1b and 4b are turned on, and the capacitor C is charged with the voltage of the secondary battery VC. Then, after the switch circuits 1b and 4b are released again, the switch circuit 7b is turned on, whereby the potential of the secondary battery VC can be output to the output unit V with reference to the ground potential. Similarly, to output the potential difference of the secondary battery VB, only the switch circuits 2b and 5b are turned on, and the capacitor C is charged with the voltage of the secondary battery VB. Then, after the switch circuits 2b and 5b are released, the switch circuit 7b is turned on, whereby the potential of the secondary battery VB can be output to the output unit V with reference to the ground potential. The potential difference of the secondary battery VA can be output to the output unit V in a similar manner.
[0004]
[Problems to be solved by the invention]
Conventionally, in a battery potential difference conversion circuit that converts the potential difference of each secondary battery used in a battery unit for each cell with reference to the ground potential and outputs the same, a high voltage is applied to a switch circuit used. However, there is a problem that a switch circuit having a high electric breakdown voltage is required.
[0005]
In other words, in FIG. 2, when the secondary batteries VA, VB, and VC are 4.1 V lithium ion secondary batteries, to output the potential difference of the secondary battery VC, if only the switch circuits 1b and 4b are turned on, The switch circuits 3b and 6b, 7b in the released state are applied with a potential difference of two cells of the secondary batteries VB + VC and VA + VB, that is, 8.2V, so that the three-cell series-connected secondary batteries are connected. A switch circuit that constitutes a potential difference conversion circuit that converts a potential difference for each cell with respect to a ground potential and outputs the result requires an electric breakdown voltage of at least two cells or more.
[0006]
Therefore, a switch circuit formed in a potential difference conversion circuit of a secondary battery in which n (n> 3) cells are connected in series needs to have an electric breakdown voltage of at least n-1 cells or more. When n = 11 cells are connected in series in an ion secondary battery, the electrical withstand voltage of the switch circuit constituting the potential difference conversion circuit must be at least 41 V, and the configuration of the switch circuit has been extremely difficult.
[0007]
The present invention has been made to solve the above-mentioned conventional problems, and for example, converts a potential difference between series-connected secondary batteries used in a battery unit for each cell with respect to a ground potential and outputs the potential difference. It is an object of the present invention to provide a battery potential difference conversion circuit which can be realized using a switch circuit having a low electric breakdown voltage in a conversion circuit.
[0008]
[Means for Solving the Problems]
The battery potential difference conversion circuit according to claim 1 includes a plurality of battery groups connected in series, a pair of switch circuits connected in series and connected in parallel to at least one battery of the battery group, and a pair of switch circuits. A capacitor having a mutual connection point connected to the first electrode side and another switch circuit connecting the second electrode side of the capacitor to a reference potential, wherein the potential on the second electrode side of the capacitor is set as an output potential It is.
[0009]
According to the battery potential difference conversion circuit of the first aspect, when one of the pair of switch circuits and another switch circuit are closed, the capacitor is charged. Then, when these switch circuits are opened and the other of the pair of switch circuits is closed, the capacitor is charged. The potential of the battery appears on the second electrode side of the capacitor. In this case, when one of the pair of switch circuits and another switch circuit are closed, only the potential difference of one battery is applied to the other of the pair of switch circuits. Next, when the other of the pair of switch circuits is closed, only the potential difference of one battery is applied to one of the pair of switch circuits and another switch circuit. Therefore, as compared with the conventional example, the switch circuit uses a switch circuit having a low electric breakdown voltage regardless of the number of batteries, and converts the potential difference of each secondary battery with respect to each reference voltage for each cell. The output potential conversion circuit can be easily realized.
[0010]
According to a second aspect of the present invention, in the battery potential difference conversion circuit of the first aspect, the first switch circuit, the second switch circuit, and the third switch circuit each include a first conductivity type MOS transistor.
According to the battery potential difference conversion circuit of the second aspect, the same effect as that of the first aspect is obtained. According to a third aspect of the present invention, the first switch circuit, the second switch circuit and the third switch circuit are a first conductivity type MOS transistor and a second conductivity type MOS transistor, respectively. It comprises a transmission gate in which transistors are connected in parallel.
[0011]
According to the battery potential difference conversion circuit of the third aspect, the same effect as that of the first aspect is obtained.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a secondary battery potential difference conversion circuit according to an embodiment of the present invention. In FIG. 1, VA, VB, and VC are, for example, rechargeable batteries (hereinafter, referred to as secondary batteries) connected in series, specifically, lithium ion secondary batteries of 4.1 V each. Is a potential difference generated from the ground potential to the cathode side of the secondary battery VA, and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 are in a conductive state and a released state, respectively. It is a switch circuit to be realized. C1, C2, and C3 are capacitors.
[0013]
This secondary battery potential difference conversion circuit includes a plurality of battery groups VA, VB, and VC connected in series, and a pair of switch circuit groups connected in series and connected in parallel to each of the battery groups VA, VB, and VC, that is, a pair of switch circuits. Switch circuits 1, 2, a pair of switch circuits 3, 4, a pair of switch circuits 5, 6, and capacitors C1, C2, C3 each having a connection point of the pair of switch circuits connected to the first electrode side. And other switch circuits 10, 11, and 12 for connecting the respective second electrode sides of the capacitors C1, C2, and C3 to a reference potential, and the potentials of the capacitors C1, C2, and C3 on the second electrode side are output potentials. V.
[0014]
In the embodiment, three secondary batteries VA, VB, and VC are connected in series, a switch circuit 1 is connected to the anode side of the secondary battery VC, and a switch circuit 2 is connected to the cathode side of the secondary battery VC. And the outputs of the switch circuits 1 and 2 are connected to one electrode of the capacitor C1. Similarly, a switch circuit 3 is connected to the anode side of the secondary battery VB, and a switch circuit 4 is connected to the cathode side of the secondary battery VB. The outputs of the switch circuits 3 and 4 are connected to one electrode of the capacitor C2. It is connected to the. Further, a switch circuit 5 is connected to the anode side of the secondary battery VA, and a switch circuit 6 is connected to the cathode side of the secondary battery VA. The outputs of the switch circuits 5 and 6 are connected to one electrode of the capacitor C3. It is connected. Ground switch circuits 10, 11, 12 and output switch circuits 7, 8, 9 are connected to the electrodes on the opposite sides of the capacitors C1, C2, C3. V is an output unit that outputs a potential difference between VA, VB, and VC with reference to the ground potential.
[0015]
The operation of the secondary battery potential difference conversion circuit configured as described above will be described. First, the switch circuits 2, 4, 6 and the switch circuits 10, 11, and 12 are turned on to charge the capacitor C1 with a voltage of VA + VB + VR, charge the capacitor C2 with a voltage of VA + VR, and charge the capacitor C3 with a voltage of VR. Charge. The voltages applied to the switches in the open state at this time are as follows.
Switch circuit 1 ---- Potential difference switch circuit of secondary battery VC 3 ----Potential difference switch circuit of secondary battery VB 5 ----Potential difference switch circuit 7 of secondary battery VA --- 0 V
Switch circuit 8----0V
Switch circuit 9--0V
Next, all the switch circuits are released. The voltages applied to the switches at this time are as follows.
Switch circuit 1 ---- Potential difference switch circuit 2 --- 0V of secondary battery VC
Switch circuit 3 ------ Potential difference switch circuit of secondary battery VB 4--0 V
Switch circuit 5 ---- Potential difference switch circuit 6--0V of secondary battery VA
Switch circuit 7--0V
Switch circuit 8----0V
Switch circuit 9--0V
Switch circuit 10-0V
Switch circuit 11-0V
Switch circuit 12-0V
Thereafter, the switch circuits 1 and 7 are used to output the potential of the secondary battery VC, the switch circuits 3 and 8 are used to output the potential of the secondary battery VB, and the switch circuits are used to output the potential of the secondary battery VA. When the terminals 5 and 9 are turned on, the potential difference of each secondary battery is output to V with respect to the ground voltage. For example, the voltages applied to other open switches when the switch circuits 1 and 7 are turned on are as follows.
Switch circuit 2 ---- Potential difference switch circuit of secondary battery VC 3 ------ Potential difference switch circuit 4-2 V of secondary battery VB
Switch circuit 5 ---- Potential difference switch circuit 6--0V of secondary battery VA
Switch circuit 8 --- Potential difference switch circuit of secondary battery VC 9 ----Potential difference switch circuit 10 of secondary battery VC-Potential difference switch circuit 11 of secondary battery VC --- 0 V
Switch circuit 12-0V
Therefore, in a series of operations of the potential difference conversion circuit, a potential difference of 4.1 V for one cell is always applied to all the configured switches. All switches configured in the same manner when the switch circuits 3 and 8 for outputting the potential of the secondary battery VB and the switch circuits 5 and 9 for conducting the output of the potential of the secondary battery VA are turned on. Are always applied with a potential difference of one cell.
[0016]
As described above, according to the embodiment of the present invention, in the plurality of secondary batteries connected in series, the first electrode side of at least one of the secondary batteries in the group of secondary batteries connected in series is connected to the first electrode side. A switch circuit that outputs a potential on the two electrodes side to the first electrode side of the capacitor and a switch circuit that outputs the potential on the second electrode side of the capacitor to the reference potential is used. Thus, a secondary battery potential difference conversion circuit can be realized.
[0017]
In this embodiment, the configuration and operation of the potential difference equalizing circuit for the three secondary batteries connected in series have been described. However, the potential difference equalizing circuit for the three or more secondary batteries connected in series has been described. Even with the same configuration, since the potential difference of one cell is always applied to all the switches, the effect of the present invention increases as the number of secondary batteries connected in series increases.
[0018]
Further, as the switch circuits 1 to 12, a mechanical or electronic relay device can be used.
Each of the switch circuits 1 to 12 can be constituted by a single MOS transistor of the first conductivity type, for example, a single P-type MOS transistor.
Further, the switch circuits 1 to 12 each include a transmission gate in which a first conductivity type MOS transistor and a second conductivity type MOS transistor are connected in parallel, such as a transmission gate in which a P type MOS transistor and an N type MOS transistor are connected in parallel. Can be used.
[0019]
Further, the battery potential difference conversion circuit of the present invention may be any circuit that converts the potential difference of at least one battery of the battery group and outputs the result.
[0020]
【The invention's effect】
According to the battery potential difference conversion circuit of the first aspect, when one of the pair of switch circuits and another switch circuit are closed, the capacitor is charged. Then, when these switch circuits are opened and the other of the pair of switch circuits is closed, the capacitor is charged. The potential of the battery appears on the second electrode side of the capacitor. In this case, when one of the pair of switch circuits and another switch circuit are closed, only the potential difference of one battery is applied to the other of the pair of switch circuits. Next, when the other of the pair of switch circuits is closed, only the potential difference of one battery is applied to one of the pair of switch circuits and another switch circuit. Therefore, as compared with the conventional example, the switch circuit uses a switch circuit having a low electric breakdown voltage regardless of the number of batteries, and converts the potential difference of each secondary battery with respect to each reference voltage for each cell. The output potential conversion circuit can be easily realized.
[0021]
According to the battery potential difference conversion circuit of the second aspect, the same effect as that of the first aspect is obtained. According to the battery potential difference conversion circuit of the third aspect, the same effect as that of the first aspect is obtained.
[Brief description of the drawings]
FIG. 1 is a diagram of a secondary battery potential difference conversion circuit according to an embodiment of the present invention.
FIG. 2 is a conventional secondary battery potential difference conversion circuit diagram.
[Explanation of symbols]
VA, VB, VC Secondary batteries 1 to 12, 1b to 7b Switch circuits C, C1, C2, C3 Capacitor V Output section of output voltage with respect to the ground potential of each secondary battery

Claims (3)

複数個直列接続された電池群と、直列接続されて前記電池群の少なくとも一つの電池に並列に接続された一対のスイッチ回路と、この一対のスイッチ回路の相互の接続点を第１電極側に接続したコンデンサと、このコンデンサの第２電極側を基準電位に接続する別のスイッチ回路とを備え、前記コンデンサの前記第２電極側の電位を出力電位とした電池電位差変換回路。A plurality of battery groups connected in series, a pair of switch circuits connected in series and connected in parallel to at least one battery of the battery group, and a mutual connection point of the pair of switch circuits on the first electrode side. A battery potential difference conversion circuit, comprising: a connected capacitor; and another switch circuit for connecting a second electrode side of the capacitor to a reference potential, wherein the potential on the second electrode side of the capacitor is an output potential. 第１のスイッチ回路、第２のスイッチ回路および第３のスイッチ回路は、それぞれ第一導電形のＭＯＳトランジスタからなる請求項１記載の電池電位差変換回路。2. The battery potential difference conversion circuit according to claim 1, wherein each of the first switch circuit, the second switch circuit, and the third switch circuit comprises a first conductivity type MOS transistor. 第１のスイッチ回路、第２のスイッチ回路および第３のスイッチ回路は、それぞれ第一導電形のＭＯＳトランジスタと第二導電形のＭＯＳトランジスタを並列に接続したトランスミッションゲートからなる請求項１記載の電池電位差変換回路。2. The battery according to claim 1, wherein the first switch circuit, the second switch circuit, and the third switch circuit each include a transmission gate in which a first conductivity type MOS transistor and a second conductivity type MOS transistor are connected in parallel. Potential difference conversion circuit.
JP10455798A 1998-04-15 1998-04-15 Battery potential difference conversion circuit Expired - Fee Related JP3572193B2 (en)

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JP3572193B2 true JP3572193B2 (en) 2004-09-29

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