| 摘要 |
A power supply system includes an AC power source, a converter, a relay switch, and a waveform monitoring circuit. The AC power source provides an AC voltage. The converter is capable of converting the AC voltage into a DC voltage. The relay switch is connected between the AC power source and the converter. The waveform monitoring circuit is connected to the AC power source, and monitors a waveform of the AC voltage provided by the AC power source. The waveform monitoring circuit is connected to the relay switch, and turns on the relay switch when an absolute value of an instantaneous voltage of the AC voltage is not bigger than a threshold voltage.
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