Power converter and method of controlling the same

A power converter, comprising:

• a transformer, comprising a primary-side winding and a secondary-side winding coupled to the primary-side winding,
• an inductance-capacitance resonance circuit, coupled to the primary-side winding, and the inductance-capacitance resonance circuit comprising a resonance capacitor and a resonance inductor, wherein the resonance inductor is a magnetizing inductance of the primary-side winding,
• a first switch and a second switch coupled to the first switch, and the first switch and the second switch coupled to the inductance-capacitance resonance circuit,
• a discharging circuit connected to the resonance capacitor, and the discharging circuit comprising:
• a resistor, and
• a discharging control switch connected to the resistor in series to form a series-connected branch, and
• a controller, configured to receive an output voltage feedback signal of the power converter and complementarily control the first switch and the second switch to be turned on and turned off according to the output voltage feedback signal so as to adjust an output voltage of the power converter,
• wherein when the power converter is not supplied power by an input power source in a stop stage, the controller is configured to turn off the first switch and the second switch, and turn on the discharging control switch so that energy accumulated in the resonance capacitor is released through the series-connected branch, and
• wherein before the power converter enters a re-supplying stage from the stop state, the controller is further configured to turn on a discharging path for a predetermined time period to release energy stored in the resonance capacitor so as to reduce a resonance current during a first cycle of the re-supplying stage.