Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1995-08-14
1998-09-22
Elms, Richard T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307116, 307127, 307 64, 307 66, 307130, 320 34, H02J 704
Patent
active
058118950
ABSTRACT:
A power supply circuit prevents, without the use of a series diode, the flow of reverse current from a battery to an AC power adaptor when the power adaptor is disconnected from its external power source. The circuit includes both voltage and current detectors to determine if the output voltage and current of the power adaptor are above or below predetermined reference levels. A summing circuit sums the outputs of the voltage and current detectors, and when both the detected voltage and current are below the reference levels, a switch disconnects the battery from the output terminal of the power adaptor, thereby preventing reverse current flow.
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Electronic Design vol. 40, No. 8, pp. 47-50,52; Frank, Goodenough; synchronous. Rectifier UPS PC Battery Life, Apr. 16, 1992.
Kozasu Yohichi
Suzuki Keiji
Elms Richard T.
International Business Machines Corp.
McKinley Martin J.
Paladini Albert W.
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