Power conversion apparatus and control method thereof

A power conversion apparatus, comprising:

• an output capacitor;
• an AC-to-DC conversion circuit, configured to convert an AC power into a DC power;
• a transformer-based auxiliary circuit, providing a leakage inductance energy;
• an inrush suppression component, connected in series between the AC-to-DC conversion circuit and the output capacitor to provide a first conduction path;
• and
• a switching circuit, connected across the inrush suppression component to provide a second conduction path, and determining whether to turn on the second conduction path in response to the leakage inductance energy,
• wherein the AC-to-DC conversion circuit conducts the DC power to the output capacitor via the first conduction path when the switching circuit cuts off the second conduction path in response to the leakage inductance energy,
• wherein the AC-to-DC conversion circuit conducts the DC power to the output capacitor via the second conduction path when the switching circuit turns on the second conduction path in response to the leakage inductance energy, and
• wherein the transformer-based auxiliary circuit comprises an absorbing circuit to absorb energy generated by a leakage inductance and provide non-absorbed energy of the leakage inductance to the switching circuit as the leakage inductance energy.