[특허]Secondary battery protection device from overcharge/overdischarge

[미국특허] Secondary battery protection device from overcharge/overdischarge 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
출원번호	US-0777965 (1996-12-24)
우선권정보	JP-0352118 (1995-12-27)
발명자 / 주소	Yamaguchi Takeshi,JPX Sakaguchi Yosifumi,JPX Tanaka Shinji,JPX Yokohama Takehisa,JPX Horisaki Kouichi,JPX Matsumasa Eiji,JPX
출원인 / 주소	Hitachi Microcomputer System, Ltd., JPX
대리인 / 주소	Fay, Sharpe, Beall, Fagan, Minnich & McKee
인용정보	피인용 횟수 : 45 인용 특허 : 4

초록 ▼

A protection circuit device for protecting a secondary battery from an overcharge and/or an overdischarge has first and second terminals, across which a charger and a load are alternatively connectable. A first switch and/or a second switch may be provided in series with the secondary battery between the first and second terminals. In a charging operation mode, the second switch is kept conductive. A charging operation is performed with the first switch made conductive. When the battery is overcharged for some reasons, the first switch is turned off. Upon connection of a load across the first and second terminals, the first switch is restored to a conductive state for a discharging operation which releases the battery from an overdischarge state. In a discharging operation mode, the first switch is kept conductive. A discharge operation is performed with the second switch made conductive. When the battery is overdischarged, the second switch is caused to remain conductive even after commencement of the overdischarge, so that the battery can continue the discharge operation if the temporary overdischarge does not last longer than the predetermined period of time.

대표청구항 ▼

[ We claim:] [1.] A protection circuit device for protecting a secondary battery from an overcharge and an overdischarge, having first and second terminals across which a charger and a load are alternatively connectable, wherein electric current flows into said first terminal and flows out from said second terminal in a charging operation mode while electric current flows out from said first terminal and flows into said second terminal in a discharging operation mode, the device comprising:a voltage divider having first and second ends electrically connected to said first and second terminals, respectively, a secondary battery being connectable across said first and second ends of said voltage divider to provide first and second terminal voltage signals each representative of a terminal voltage of said secondary battery;a first detector connected to said voltage divider for receiving said first terminal voltage signal, said first detector generating an overcharge detection signal when said first terminal voltage signal exceeds a first reference voltage in the charging operation mode;a second detector connected to said second terminal, said second comparator generating a release signal when a voltage on said second terminal exceeds a second reference voltage in the discharging operation mode;a third detector connected to said voltage divider for receiving said second terminal voltage signal, said third detector generating an overdischarge detection signal when said second terminal voltage signal decreases below a third reference voltage in the discharging operation mode;a series connection of first and second switches provided between said second end of said voltage divider and said second terminal;a first diode connected in parallel with said first switch, said first diode being connected to have a forward bias direction concurrent with a direction of current flow in said discharging operation mode;a second diode connected in parallel with said second switch, said second diode being connected to have a forward bias direction opposite to the direction of current flow in said discharging operation mode;a first controller connected to receive said overdischarge detection signal from said first detector and said release signal from said second detector for on-off controlling said first switch, said first controller being operative to turn on said first switch to a conductive state to start a charging operation when said charger is connected across said first and second terminals, being responsive to said overcharge detection signal from said first detector to turn off said first switch in said charging operation, and being responsive to said release signal from said second detector to turn on said first switch to restore it to the conductive state when the load is connected across said first and second terminals instead of said charger; anda second controller connected to receive said overdischarge detection signal from said third detector for on-off controlling said second switch, said second controller being responsive to an absence of said overdischarge detection signal to turn on said second switch conductive to start a discharging operation when said load is connected across said first and second terminals, and being responsive to said overdischarge detection signal to turn off said second switch when said overdischarge detection signal lasts a predetermined period of time.

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IPC	Description
A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Secondary battery protection device from overcharge/overdischarge 원문보기