[특허]Cell balance circuit having rechargeable cells

[미국특허] Cell balance circuit having rechargeable cells 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
출원번호	US-0902180 (1997-07-29)
우선권정보	JP-0200260 (1996-07-30)
발명자 / 주소	Higashijima Yasuhisa,JPX
출원인 / 주소	Mitsumi Electric Co., Ltd., JPX
대리인 / 주소	Frishauf, Holtz, Goodman, Langer & Chick
인용정보	피인용 횟수 : 18 인용 특허 : 2

초록 ▼

In a cell balance circuit including a cell group in which two or more rechargeable cells are connected in series, a voltage converting circuit converts the voltages of the respective cells in the cell group into GND voltage standards on the basis of a ground voltage and produces two or more converted voltages. An output circuit determines a lowest voltage of the two or more converted voltages and produces the lowest voltage. Discharge circuits are provided for the respective cells for forming discharge loops to discharge the corresponding cells. Discharge control circuits are provided for the respective discharge circuits. Each discharge control circuit determines a difference between the converted voltage of the corresponding cell and the lowest voltage to control the discharge circuit to form the discharge loop when the difference exceeds a predetermined value.

대표청구항 ▼

[ What is claimed is:] [1.] A cell balance circuit for achieving a balance of voltages among two or more rechargeable cells connected in series in a cell group, said cell balance circuit comprising:a voltage converting circuit that converts the voltages of the respective cells in the cell group into GND voltage standards based on a ground voltage to produce two or more converted voltages;an output circuit that determines a lowest voltage of the two or more converted voltages to produce the lowest voltage;a plurality of discharge circuits, respectively provided for corresponding ones of the cells, said discharge circuits forming a discharge loop for discharging the respective cells; anda plurality of discharge control circuits, also respectively provided for corresponding ones of the cells, which detect a difference between the converted voltages of the respective cells and the lowest voltage, and which control said discharge circuits to form the discharge loop when the difference exceeds a predetermined values;wherein each of said discharge control circuits comprises: (i) a comparison circuit for use in detecting a difference between the converted voltage of a corresponding cell and the lowest voltage, said comparison circuit including a first transistor which has a base terminal supplied with the converted voltage of the corresponding cell and a second transistor which has a base terminal supplied with the lowest voltage; and (ii) a drive circuit connected between the comparison circuit and the discharge circuit of the corresponding cell, said drive circuit including a current mirror circuit and a third transistor which is turned on together with the current mirror circuit to drive the corresponding discharge circuit to form said discharge loop when the difference detected by the comparison circuit exceeds the Predetermined value.

이 특허에 인용된 특허 (2) 인용/피인용 타임라인 분석

Eguchi Yasuhito (Kanagawa JPX) Sato Masayuki (Tokyo JPX) Narushima Toshio (Kanagawa JPX) Sanpei Akira (Fukushima JPX) Murano Kanji (Tokyo JPX), Circuit for preventing overcharge and overdischarge of secondary batteries.
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Stockstad Troy L. (Phoenix AZ), Method for balancing power sources and structure therefor.
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이 특허를 인용한 특허 (18) 인용/피인용 타임라인 분석

Sobue,Satoshi; Yamamoto,Tomohisa, Cell voltage equalization apparatus for combined battery pack including circuit driven by power supplied by the combined battery pack.
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Thrap, Guy C., Charge balancing circuit.
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Kikuchi, Yoshiaki, Charge control device and vehicle equipped with the same.
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Tanno, Yoshikatsu, Charge/discharge control method.
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Densham, William, Circuits and methods for protection of battery modules.
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Schwartz, Paul D.; Martin, Mark N.; Roufberg, Lewis M., Device and method for continuously equalizing the charge state of lithium ion battery cells.
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Davis, Steven; Takeuchi, Esther S., Matching cells for a battery pack.
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Odell, Arthur B., Method and apparatus for balancing active capacitor leakage current.
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Odell,Arthur B., Method and apparatus for balancing active capacitor leakage current.
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Odell,Arthur B., Method and apparatus for balancing active capacitor leakage current.
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Suzuki, Shin, Power storage system having current limiting means to control multiple parallel connected battery packs.
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Carrier, David A.; Phillips, Steven J.; Francis, Jeffrey J.; Bailey, R. Roby; Trinh, Danh Thanh; Seman, Jr., Andrew E.; Yahnker, Christopher R.; Brotto, Daniele C., Protection methods, protection circuits and protection devices for secondary batteries, a power tool, charger and battery pack adapted to provide protection against fault conditions in the battery pack.
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Carrier,Dave; Phillips,Steve; Francis,Jeffrey J.; Bailey,R. Roby; Trinh,Danh Thanh; Seman, Jr.,Andrew E.; Yahnker,Christopher R.; Brotto,Daniele C.; Vanko,John C.; Bradus,Robert, Protection methods, protection circuits and protective devices for secondary batteries, a power tool, charger and battery pack adapted to provide protection against fault conditions in the battery pack.
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Kaneta, Hiroshi; Kanbe, Chika, Secondary battery having third terminal other than positive and negative electrode terminals and battery comprising it.
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Suzuki, Shin, Secondary battery pack connection control method for controlling connection of input and output terminals in power storage system comprising plurality of secondary battery packs.
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Nakatsuji, Toshiyuki, Set battery control method and set battery control circuit as well as charging circuit and battery pack having the set battery control circuit.
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Lundquist, David, System and method to facilitate voltage balancing in a multi-cell battery.
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Densham, William, System and methods for protection of battery modules.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Cell balance circuit having rechargeable cells 원문보기