NOVEL ZERO-CURRENT-TRANSITION PWM CONVERTERS

A new family of zero-current-transition (ZCT) pulse-width-modulated (P WM) converters is proposed. The new family of converters implements ze ro-current turn-off for power transistor(s) without increasing voltage /current stresses and operates at a fixed frequency. The proposed conv erters are deemed most suitable for high-power applications where the minority-carrier semiconductor devices (such as IGBT's, BJT's, and MCT 's) are predominantly used as the power switches. Theoretical analysis is verified on a 100 kHz, 1 kW ZCT-PWM boost converter using an IGBT.