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What is Zero-Switching Converter?

In the quasi-resonant converter, an auxiliary switch is added to control the operation of the resonant network to make the converter work for a part of the time according to the ZCS or ZVS quasi-resonant converter, and the other part of the time is operated by the PWM converter, called ZCS- PWM or ZVS-PWM converter. It combines the features of ZCS (or ZVS) soft switching and PWM constant frequency control. The inductance in the resonant network is then in series with the main switch.