LOSS-PHASE LACK-VOLTAGE DETECTION CIRCUIT FOR THREE-PHASE INPUT POWER
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United States of America Patent
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Issued Date -
Dec 8, 2016
app pub date -
Jun 6, 2015
filing date -
Jun 6, 2015
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Abstract
A loss-phase lack-voltage detection circuit for three-phase input power includes a half-wave rectifier circuit, a bleeder circuit, an optical coupler circuit and a digital signal processor sequentially connected with each other. The half-wave rectifier circuit serves to rectify the input power. The bleeder circuit has multiple bleeder resistors for stepping down the voltage. The optical coupler circuit serves to generate judgment signal in form of pulse wave. The digital signal processor serves to calculate the duration for which the pulse wave stays at the peak value to judge the loss-phase state of the input power.
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