| 摘要 |
A power supply auxiliary circuit includes a power input unit for receiving an AC input voltage, a voltage regulating unit for dropping the AC input voltage, a rectifying unit for converting the dropped AC input voltage into a DC voltage, a snubber unit for filtering the DC voltage, a power output unit for sending the filtered DC voltage, a switch unit connected between the rectifying unit and a feedback control unit, and the feedback control unit connected between the power output unit and the switch unit for detecting and analyzing the output voltage of the power output unit, and then generating a corresponding control signal to determine a switch state of the switch unit that makes the current from the rectifying unit partially back-flow to the power input unit or not, and further regulates the value of the output voltage of the power output unit.
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