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 topolog y. The load resonant circuit of the proposed topology draws a high-frequenc y pulse current directly from the ac source. This approach can be accomplis hed merely with an additional small capacitor as the energy buffer and a di ode as the energy transfer switch. The design and experimental results for an implementation example are given to verify the theoretical analyses.