| CPC G01R 19/16523 (2013.01) [G01R 19/16576 (2013.01); G01R 19/1659 (2013.01); G01R 22/068 (2013.01)] | 16 Claims |
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1. An abnormal detection circuit for detecting a three-phase alternating current (AC) power, comprising:
a conversion circuit, configured to receive the three-phase AC power and convert the three-phase AC power into a driving power;
a voltage detection circuit, coupled to the three-phase AC power and the conversion circuit, configured to detect each phase of the three-phase AC power, and when detecting abnormality occurs in a voltage value of at least one phase AC power of the three-phase AC power, using the driving power to output at least one control signal corresponding to the abnormality; and
a warning circuit, coupled to the voltage detection circuit and the conversion circuit, configured to be driven by receiving the driving power, and outputting at least one warning signal corresponding to the abnormality in response to the at least one control signal,
wherein the warning circuit comprises:
a first phase warning circuit, configured to be driven by receiving the driving power, providing a first phase over voltage warning signal in response to a first phase over voltage control signal, and providing a first phase under voltage warning signal in response to a first phase under voltage control signal,
wherein the first phase warning circuit comprises:
a first switch, coupled between the driving power and a reference low voltage, and configured to be turned on in response to the first phase over voltage control signal, so as to enable the first phase over voltage warning signal; and
a second switch, coupled between the driving power and the reference low voltage, and configured to be turned on in response to the first phase under voltage control signal, so as to enable the first phase under voltage warning signal.
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