Power supply negative phase detecting circuit
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United States of America Patent
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-
Sep 2, 2003
Grant Date -
Mar 7, 2002
app pub date -
Jul 26, 2001
filing date -
Aug 10, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A power supply negative-phase detecting circuit (10) for electronic equipment (12) using a three-phase AC power supply source includes a pulse generator (13) for generating a first pulse indicating the phase difference between any pair of two phases of three-phase AC power to be supplied to the electronic equipment and a second pulse indicating the phase difference between another pair of two phases of the three-phase AC power, a differentiating circuit (25) for generating a third pulse from the second pulse in synchronism with the rise-up of the second pulse so that the third pulse has a pulse width smaller than the phase difference between the first and second pulses, and a switching unit (14) for subjecting the first pulse and the third pulse to OR operation and turning on/off the power supply to be supplied to the electronic equipment on the basis of the OR operation result of the first and third pulses.
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