Control Characteristics of Zero-Current-Switching Quasi-Resonant Buck Converter under Variation of Resonant Circuit and Load Parameters

The investigation of resonant circuit parameters influence on control characteristics in buck half-wave quasi-resonant converter is presented. The dependences of the voltage conversion ratio, control pulses duration, and operating frequency of the converter under variation of resonant circuit parameters and control pulses duty cycle are obtained by dint of numeric simulation. The dependences of these characteristics under variation of load impedance and control duty cycle are also obtained. The research results allow simplifying the development flow and construction of robust table-based or adaptive control systems for quasi-resonant converters.