Model-Based Design of a Buck ZVS Quasi-Resonant DC-DC Converter

Power electronic devices and electrical energy conversion systems are widely used in the realization of the concept of green and circular economy. In view of the ever-increasing share of the energy that is converted, the questions related to the energy indicators of electronic converters are extremely important. One of the concepts for increasing the efficiency of power circuits is the use of soft switching based on the use of resonant switches. These circuits are known as quasi-resonant. The work examines the principle of operation, the main ratios describing electromagnetic processes and a mathematical model of a quasi-resonant Zero Voltage Switching Buck DC - DC converter. Then, on the basis of numerical experiments conducted with the model, the optimal values of the resonant elements were determined with a view to minimal voltage loading of the semiconductor switches. The proposed design approach is suitable for use in power circuits for which no suitable design methodologies have been established.