[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-0260177 (2005-10-28)
등록번호	US-7276881 (2007-10-02)
우선권정보	JP-11-074479(1999-03-18)
발명자 / 주소	Okumura,Masafumi Tanaka,Shigeo
출원인 / 주소	Fujitsu Limited
대리인 / 주소	Arent Fox PLLC
인용정보	피인용 횟수 : 11 인용 특허 : 23

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 portable electronic device, comprising: a load; a power supply terminal; a control circuit; and a battery unit, comprising: a plurality of battery cells supplying power to the load via the power supply terminal; a monitor circuit to monitor an over-discharging state of the battery cells and to output a first monitor signal; a discharge control switch, coupled between the load and the battery cells, switched between ON and OFF states in response to the first monitor signal and to discharge the battery cells in the ON state; and a discharge control unit to output a signal which forcibly switches the discharge control switch to the OFF state independently from the first monitor signal, in response to a control signal from the control circuit. 2. The portable electronic device as claimed in claim 1, wherein the discharge control circuit releases the discharge control switch from the OFF state to switch to the ON state in response to a release signal from the control circuit. 3. The portable electronic device as claimed in claim 1, wherein the monitor circuit monitors a charging state of the battery cells and outputs a second monitor signal, and the discharge control circuit releases the discharge control switch from the OFF state to switch to the ON state in response to the second monitor signal. 4. The portable electronic device as claimed in claim 3, wherein the discharge control switch is controlled in response to the first monitor signal after being released from the OFF state in response to the second monitor signal. 5. The portable electronic device as claimed in claim 1, wherein the monitor circuit monitors the over-discharging state of the battery cells when the discharge control switch is held in the OFF state in response to the signal output from the discharge control circuit, and the discharge control circuit releases the discharge control switch from the OFF state in response to the first monitor signal when the monitor circuit monitors the over-discharging state. 6. The portable electronic device as claimed in claim 5, wherein the discharge control switch is controlled in response to the first monitor signal after being released from the OFF state in response to the second monitor signal. 7. The portable electronic device as claimed in claim 1, wherein the monitor circuit releases the discharge control switch from the OFF state when a voltage of any one of the battery cells reaches a predetermined value. 8. The portable electronic device claimed In claim 7, wherein the predetermined value is variable.

이 특허에 인용된 특허 (23) 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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Okumura, Masafumi; Tanaka, Shigeo, Battery unit having means for preventing over-discharge.
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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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Smith, Gregory J., Method and apparatus for placing a battery pack that is in a usable mode into a storage sleep-mode ensuring long storage.
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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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Saeki,Mitsuo; Ozawa,Hidekiyo, Protection method, control circuit, and battery unit.
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이 특허를 인용한 특허 (11) 인용/피인용 타임라인 분석

Demilato, Giuliana; Alessandro, Agatino Antonino; Adamo, Santi Carlo; Arcidiacono, Liliana, Battery charger.
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Alessandro, Agatino Antonino; Demilato, Giuliana; Arcidiacono, Liliana; Adamo, Santi Carlo, Battery charger for providing battery protection from over discharge from voltage or current and shipping mode.
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Yang, Jongwoon; Hwang, Euijeong; Segawa, Susumu; Kim, Jinwan; Yun, Hanseok; Kim, Beomgyu, Battery pack and line open detecting method thereof.
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Wang, Bing; Ma, Chao Hung, Battery protecting circuit and battery with such protecting circuit.
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Kitano, Mayo; Kokubun, Masatoshi, Charging circuit, charging apparatus, electronic equipment and charging method.
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Zhu, Li-Yan, Connection scheme for multiple battery cells.
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Yang, Szu-Nan, Electricity supply system.
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Amiruddin, Shabab; Venkatachalam, Subramanian; Lopez, Herman A.; Kumar, Sujeet, High voltage battery formation protocols and control of charging and discharging for desirable long term cycling performance.
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Zhu, Li-Yan, Management scheme for multiple battery cells.
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Kim, Myeong-je, Mobile X-ray apparatus including a battery management system.
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Saito, Keisuke, Protective circuit and charging device.
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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

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