[특허]Low power indication circuit for lead acid battery pack

[미국특허] Low power indication circuit for lead acid battery pack 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
출원번호	US-0578536 (2000-05-24)
발명자 / 주소	Mowry Michael R. Becker Thomas P.
출원인 / 주소	Snap-on Technologies, Inc.
대리인 / 주소	Seyfarth Shaw
인용정보	피인용 횟수 : 38 인용 특허 : 18

초록 ▼

A lead-acid battery pack has an electronically-controlled power switch connected in series with the battery. A voltage monitor/controller is connected in series with a normally-open ON/OFF switch across the battery, the controller controlling a ramped pulse width modulator which provides a switch control signal to the power switch. The controller is program controlled so that, a fraction of a second after the ON/OFF switch is closed, the modulator will provide a constant DC level control signal to the power switch to hold it closed. If the battery voltage drops below a first level for several seconds, the modulator will produce a PWM switch control signal of gradually decreasing pulse width and duty cycle until the power switch is permanently open. This gradual decrease of power delivered from the battery will occur immediately upon the battery voltage dropping below a second level lower than the first level.

대표청구항 ▼

[ We claim:] [1.]1. A battery pack comprising:a battery having at least one cell having a positive terminal and a negative terminal,an electronically controlled power switch coupled in series with the battery and having a control input for controlling operation of the switch between a full power delivery condition and a zero power delivery condition, anda control circuit connected across the battery and having an output coupled to the control input of the power switch and generating at the output a switch control signal,the control circuit including a processor and a normally-open selective ON/OFF switch connected in series across the battery, the processor operating under control of a stored program for monitoring battery voltage and for shifting the switch control signal from a normal state, which holds the power switch in its full power delivery condition, to a modulated state, which gradually shifts the power switch from its full power delivery condition to its zero power delivery condition,the program including a routine which delays monitoring of the battery voltage for a predetermined time period after closure of the ON/OFF switch.

이 특허에 인용된 특허 (18) 인용/피인용 타임라인 분석

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[미국특허] Low power indication circuit for lead acid battery pack 원문보기