[특허]Electronic charging circuit for battery operated appliances

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
출원번호	US-0643400 (1984-08-23)
발명자 / 주소	Soultanian, Setrak D.
출원인 / 주소	Wen Products, Inc.
대리인 / 주소	Hill, Van Santen, Steadman & Simpson
인용정보	피인용 횟수 : 40 인용 특허 : 1

초록 ▼

An electronic charging circuit for battery operated appliances has a thermostat in physical, heat transferring contact with a battery pack to be charged, a power resistor in physical, heat transferring contact with the thermostat, the power resistor being connected in series with the battery charger

An electronic charging circuit for battery operated appliances has a thermostat in physical, heat transferring contact with a battery pack to be charged, a power resistor in physical, heat transferring contact with the thermostat, the power resistor being connected in series with the battery charger and an electronically timed switch. Because certain types of fast charge batteries must be cooled after relatively rapid discharge, such batteries requiring approximately 10 times longer to reach full charge when overheated than when cooled, the electronically timed switch prevents commencement of charging of the battery pack after a rapid discharge until after the elapse of a selected amount of time sufficient to permit the battery pack to cool.

대표청구항 ▼

1. A charging circuit for a rechargable battery pack for use with a charger having one output terminal connected to said battery pack comprising: a normally closed thermostat in thermal contact with said battery pack and connected to another output terminal of said charger; a power resistor in t

1. A charging circuit for a rechargable battery pack for use with a charger having one output terminal connected to said battery pack comprising: a normally closed thermostat in thermal contact with said battery pack and connected to another output terminal of said charger; a power resistor in thermal contact with said thermostat and also connected to said another output terminal of said charger; and a normally open electronically timed switch means connected in series with said power resistor and in parallel with said thermostat, said thermostat opening after discharge of said battery pack due to heating thereof associated with said discharge, and said electronically timed switch means automatically closing a selected period of time thereafter or permitting charging of said battery pack at a full charging rate only after said battery pack has cooled to a temperature sufficient to permit said thermostat to again close, said thermostat again opening after said battery pack is substantially fully charged due to heating thereof associated with said charging. 2. A charging circuit as claimed in claim 1 wherein said power resistor has a resistance and heat dissipating characteristics selected for generating sufficient heat for maintaining said thermostat open after said battery pack is substantially fully charged. 3. A charging circuit as claimed in claim 1 wherein said electronically timed switch means comprises: a timer circuit connected to said charger; and a normally non-conducting transistor having a control electrode connected to an output on said timer circuit and an output electrode connected to said power resistor, said timer circuit supplying a signal to said control electrode after said selected period of time for switching said transistor to a conducting state. 4. A charging circuit as claimed in claim 3 further comprising a forward-bias diode interconnected between said output electrode of said transistor and said power resistor. 5. A charging circuit as claimed in claim 3 wherein said timer circuit is connected to a resistor and a capacitor for defining a time constant for said timer circuit equal to said selected period of time. 6. A charging circuit as claimed in claim 5 wherein said resistor and said capacitor are dimensioned such that said time constant is 30 minutes. 7. A charging circuit as claimed in claim 1 further comprising a visual indicator means connected in parallel across said power resistor for providing a visual indication when said battery pack is substantially fully charged. 8. A charging circuit as claimed in claim 7 wherein said visual indicator means is a light emitting diode. 9. A charging circuit for a rechargable battery pack for use with a charger having an output terminal connected to said battery pack comprising: a normally closed thermostat in thermal contact with said battery pack and connected to another output terminal of said charger, said thermostat opening after discharge of said battery pack due to heating thereof associated with said discharge; a power resistor in thermal contact with said thermostat and also connected to said another output terminal of said charger; a normally non-conducting transistor having an output electrode connected to said power resistor and having a control electrode; and a timer circuit having an output connected to said control electrode, said timer circuit and said transistor being connected in parallel across said thermostat, said timer circuit automatically supplying a signal to said control electrode of said transistor after a selected period of time following opening of said thermostat for switching said transistor to a conducting state for permitting charging of said battery pack at a full charging rate only after said battery pack has cooled to a temperature sufficient to permit said thermostat to again close, said thermostat again opening after said battery pack is substantially fully charged due to heating thereof associated with said charging. 10. A charging circuit as claimed in claim 9 wherein said power resistor has a resistance and heat dissipating characteristics selected for generating sufficient heat for maintaining said thermostat open after said battery pack is substantially fully charged. 11. A charging circuit as claimed in claim 9 further comprising a forward-biased diode interconnected between said output electrode of said transistor and said power resistor. 12. A charging circuit as claimed in claim 9 further comprising a visual indicator means connected in parallel with said power resistor for providing a visual indication when said battery pack is substantially fully charged. 13. A charging circuit as claimed in claim 12 wherein said visual indicator means is a light emitting diode.

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이 특허에 인용된 특허 (1) 인용/피인용 타임라인 분석

Mullersman Ferdinand H. (Gainsville FL), Timed fast charger.
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[미국특허] Electronic charging circuit for battery operated appliances 원문보기

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