Patent ID: 9705415
Date: 2017-07-11
CPC Classifications: H02M,Y02B

Claim:
1. A power supply apparatus comprising: a power supply circuit; and an active clamping circuit electrically connected to the power supply circuit, wherein the power supply circuit comprises: wherein the active clamping circuit comprises a clamping energy-storing unit, a feedback control unit, and a synchronous buck converter; the clamping energy-storing unit electrically connected to the secondary side rectifying unit, and the clamping energy-storing unit comprising: wherein the feedback control unit electrically is connected to the clamping energy-storing unit, and the feedback control unit comprises: wherein the clamping energy-storing unit clamps and stores a voltage spike to obtain an energy-storing voltage; the feedback control unit detects the energy-storing voltage and informs the synchronous buck converter of the energy-storing voltage; the synchronous buck converter receives the energy-storing voltage and adjusts the energy-storing voltage to obtain an adjusted voltage when the energy-storing voltage is greater than a predetermined voltage; the synchronous buck converter sends the adjusted voltage to the voltage output side.