CPC G01R 31/62 (2020.01) [G01R 1/20 (2013.01); G01R 19/16566 (2013.01); G01R 31/14 (2013.01)] | 12 Claims |
1. A resonance voltage attenuation detection circuit that detects attenuation of a resonance voltage of a winding of a transformer, the resonance voltage attenuation detection circuit comprising:
a first voltage comparator circuit that compares a voltage of the winding with a predetermined first voltage; and
a time-out circuit that performs clocking operation in accordance with an output of the first voltage comparator circuit,
wherein the time-out circuit outputs an attenuation detection signal when the time-out circuit has clocked a preset period which is shorter than a time required for a peak voltage of the winding to be attenuated from the first voltage to a predetermined second voltage lower than the first voltage.
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