Design and Simulation of a Zero Voltage Switching DC - DC Buck Converter

In this paper, a circuit was designed control circuit of zero voltage switching dc - dc buck converter. The simulation of the Zero Voltage Switching (ZVS) circuit involved the integration of a scope block featuring two ports, each linked to the output of a MOSFET. During simulation execution, the resulting graph exhibited a series of Pulse Width Modulation (PWM) signals corresponding to the switching MOSFETs. Time was represented along the x-axis, segmented according to a simulation time step of 0.03 seconds. The y-axis depicted binary PWM signals, indicating the MOSFETs' operational states: fully on (logic high) or fully off (logic low). The width of the rectangular pulses illustrated the duty cycle of the PWM signals, determining how long the MOSFETs remained on during each switching cycle. By adjusting the phase shift parameter, the relative timing of the PWM signals for both MOSFETs could be manipulated, which was pivotal for achieving ZVS operation and regulating power flow in the converter. Moreover, the frequency parameter, fixed at 50Hz in this setup, influenced the frequency of the PWM signals and the switching frequency of the MOSFETs. Ultimately, the objective of ZVS operation, aimed at reducing switching losses and improving efficiency by ensuring MOSFETs switch when the voltage across them is close to zero, was evidenced by the smooth transitions observed in the plot between the on and off states of the PWM signals.