[특허]Protection method, control circuit, and battery unit

[미국특허] Protection method, control circuit, and battery unit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
출원번호	US-0206065 (2002-07-29)
우선권정보	JP-11-074479(1999-03-18)
발명자 / 주소	Saeki,Mitsuo Ozawa,Hidekiyo
출원인 / 주소	Fujitsu Limited
대리인 / 주소	Arent Fox PLLC
인용정보	피인용 횟수 : 8 인용 특허 : 20

초록 ▼

A protection method for preventing battery cells from over-discharging and being overcharged, a control circuit, and a battery unit are provided. In the protection method, when a set signal "1" is supplied to a set terminal, a flip-flop outputs "1". The gate of a discharge control FET then becomes "1", so that the discharge control FET is OFF regardless of a discharge control signal supplied from a voltage monitor circuit. When a reset signal "1" is supplied to a reset terminal, the flip-flop outputs "0". The discharge control FET is then switched on and off in accordance with the output of a discharge control circuit of the voltage monitor circuit. In this manner, battery cells connected to an electronic device do not over-discharge, even when they are left unused for a long period of time. Thus, the battery unit can be prevented from deteriorating and shortening the life thereof.

대표청구항 ▼

What is claimed is: 1. A protection method for protecting battery cells from over-discharging by a protection circuit, comprising the steps of: monitoring a voltage of each of the battery cells; turning OFF a discharge control switch which is coupled between a load and the battery cells when an over-discharge is monitored; and maintaining the discharge control switch in a forced OFF state in response to an external signal, which is external to the protection circuit, regardless of whether the over-discharge is monitored. 2. The protection method as claimed in claim 1, further comprising the step of: releasing the discharge control switch from the forced OFF state in response to an external release signal. 3. The protection method as claimed in claim 1, further comprising the step of: releasing the discharge control switch from the forced OFF state when the battery cells are being charged. 4. The protection method as claimed in claim 1, further comprising the step of: releasing the discharge control switch from the forced OFF state in response to an overcharged state of at least one of the battery cells. 5. The protection method as claimed in claim 1, further comprising the step of: releasing the discharge control switch from the forced OFF state when the voltage of at least one of the battery cells reaches a predetermined voltage value. 6. A control circuit in a protection circuit for a device having a discharge control switch which controls discharge and is coupled between a load and battery cells supplying power to the load, said control circuit comprising: a monitor circuit configured to judge whether at least one of the battery cells is in an over-discharged state based on voltages inputted from the battery cells, and to turn OFF the discharge control switch when at least one of the battery cells is in an over-discharged state; and a circuit configured to maintain the discharge control switch in a forced OFF state in response to an external signal, which is external to the protection circuit, regardless of whether the over-discharged state is monitored in said monitor circuit.

이 특허에 인용된 특허 (20) 인용/피인용 타임라인 분석

Eguchi Yasuhito (Kanagawa JPX) Murano Kanji (Tokyo JPX) Sanpei Akira (Fukushima JPX) Tamiya Hajime (Tokyo JPX), Battery charge control circuit.
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Hiratsuka Masaru (Kanagawa JPX) Murayama Shigeki (Tokyo JPX) Nagai Tamiji (Kanagawa JPX) Eguchi Yasuhito (Kanagawa JPX) Tomono Kaoru (Kanagawa JPX), Battery pack including internal capacity monitor for monitoring groups of battery cells.
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Cheon Kyung-Yong,KRX, Battery pack with battery protection circuit.
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Hashimoto Hisashi (Sumoto JPX) Tamai Mikitaka (Sumoto JPX), Battery pack with short circuit protection.
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Saeki Mituo,JPX ; Yano Hidetoshi,JPX ; Ozawa Hidekiyo,JPX, Charging-and-discharging control device, a battery pack, and an electronic apparatus with improved charge and discarge c.
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Saeki Mituo,JPX ; Okumura Masafumi,JPX ; Yano Hidetoshi,JPX ; Ozawa Hidekiyo,JPX, Charging-and-discharging device for an electronic apparatus, and an electronic apparatus including the same, utilizing a charging device providing a constant charging current.
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Saeki Mituo,JPX ; Ozawa Hidekiyo,JPX ; Kubo Takeshi,JPX, Charging-and-discharging device, battery pack and electronic apparatus including them.
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Saeki Mituo,JPX ; Ozawa Hidekiyo,JPX ; Suzui Tsutomu,JPX, Charging-and-discharging device, constant-voltage and constant-current control circuit, and electronic device.
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Lang Gerhard (Altweilnau DEX), Circuit arrangement for automatically decreasing the load current.
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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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Earle Kent L. (Woodridge IL), Device for measuring a wide range of voltages and for determining continuity.
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Earle Kent L. (Woodridge IL), Device for measuring a wide range of voltages and for determining continuity.
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Earle Kent L. (Woodridge IL), Device for measuring a wide range of voltages and for determining continuity using visual and tactile indicators.
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Demuro David M., Fail safe circuit and battery pack using same.
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Sanpei Akira (Fukushima JPX) Murano Kanji (Tokyo JPX), Overcharge preventing device and overdischarge preventing device for a secondary battery.
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Sudo Minoru,JPX ; Takashina Takayuki,JPX ; Kojima Yoshikazu,JPX ; Shimoda Sadashi,JPX ; Mukainakano Hiroshi,JPX, Overcharge/overdischarge detecting circuit having current detecting means with latch function and chargeable electric power source apparatus.
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Hiroaki Ogata JP; Masaya Suenari JP; Mikio Saito JP, Overcurrent protection device.
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Kang Seo-Won (Suwon KRX), Overdischarge and overvoltage protection circuit for a battery in a portable and mobile communication system.
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Fujita Hiroyuki,JPX ; Inoue Koichi,JPX, Power supply monitoring integrated circuit device and battery pack.
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Mitsuo Saeki JP; Masafumi Okumura JP; Shigeo Tanaka JP; Hidekiyo Ozawa JP, Protection method, control circuit, and battery unit.
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이 특허를 인용한 특허 (8) 인용/피인용 타임라인 분석

Nam, Hyun-Seok; Yang, Jong-Woon, Battery protection circuit and method of controlling the same.
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Hjort, Thomas Enne; Pedersen, Michael; Mathiesen, Henrik; Nielsen, Henning Roar; Olsen, Richard Dyrmose, Method and apparatus for providing uninterruptible power.
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Hjort, Thomas Enné; Pedersen, Michael; Mathiesen, Henrik; Nielsen, Henning Roar; Olsen, Richard Dyrmose, Method and apparatus for providing uninterruptible power.
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Johnson, Todd W.; Rosenbecker, Jay J.; Meyer, Gary D.; Zeiler, Jeffrey M.; Glasgow, Kevin L.; Zick, Jonathan A.; Brozek, Jeffrey M.; Scheucher, Karl F., Method and system for battery protection.
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Johnson, Todd W.; Rosenbecker, Jay J.; Meyer, Gary D.; Zeiler, Jeffrey M.; Glasgow, Kevin L.; Zick, Jonathan A.; Brozek, Jeffrey M.; Scheucher, Karl F., Method and system for battery protection.
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Okumura,Masafumi; Tanaka,Shigeo, Protection method, control circuit, and battery unit.
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Imamura,Yasuhiro, Remote control transmitter.
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Silberbauer, Kristian; Tingskov, Carsten Nommensen, Static bypass switch with built in transfer switch capabilities.
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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] Protection method, control circuit, and battery unit 원문보기