Advanced soft-switching sinewave PWM high-frequency inverter-link cycloconverter incorporating voltage-clamped quasi-resonant and capacitive snubber techniques

An improved version of a sinewave CVCF power conversion conditioning system (PCS) which is based on a high-frequency (HF) transformer isolated-linked cycloconversion circuit incorporating soft-switching phase shifted PWM (PSM) principle and instantaneous voltage regulation strategy is discussed. This circuit topology and the modifications of the voltage-clamped quasi-resonant pole (QR-P) concept, which comprises inverter-cycloconverter cascaded power conversion stages operating under the principle of zero-voltage soft-switching (ZVS) condition are introduced in order to minimize switching losses, electrical stresses, EMI noise and to remove a complicated additional bridge type HFAC snubber. As a result, a significant improvement in power-density design, output waveform processing performance and conversion efficiency is obtained.<>