A high-power-factor DC-linked resonant inverter

A new approach of power-factor correction for the DC-linked high-frequency resonant inverters is proposed. The high-power-factor operation is achieved by altering the energy delivery process of the conventionally used topology. The load resonant circuit of the proposed topology draws a high-frequency pulse current directly from the AC source. This approach can be accomplished merely with an additional small capacitor as the energy buffer and a diode as the energy transfer switch. The design and experimental results for an implementation example are given to verify the theoretical analyses.