A new single stage power factor corrected three level resonant AC/DC converter with and without active current control

A new single-stage power factor correction converter based on a three-level LCC resonant topology that is suitable for high power applications and universal input voltage (90-265 Vrms) is proposed. It integrates the pulse width modulated (PWM) boost pre-regulators and variable frequency resonant circuits giving a variable frequency asymmetrical PWM (VFAPWM) resonant circuit operation. This regulates the output voltage, obtains a sinusoidal input current at near unity power factor and regulates the DC bus voltage to a controlled level leading to reduced switch ratings, therefore, improving the efficiency. Zero-voltage-switching is achieved for wide ranges of input voltage and loading. The circuit is studied in both continuous and discontinuous conduction modes. Simulation results for a 48 V, 2.3 kW, three-level half -bridge resonant converter operating at an input voltage of 90-265 Vrms and overall resonant frequency of 770 kHz, verify the effectiveness of the proposed method.

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