PEREE Summary of zvs or ZCS PWM converter 4 Improvement over QRC Voltage and current are basically square-wave therefore stresses are greatly reduced Constant switching frequency due to pulse-width modulation(PWM) controlPower Electron cs i 19 Summary of ZVS or ZCS PWM converter Summary of ZVS or ZCS PWM converter Improvement over QRC Improvement over QRC – Voltage and current are basically square Voltage and current are basically square -wave, therefore stresses are greatly reduced therefore stresses are greatly reduced – Constant switching frequency due to pulse Constant switching frequency due to pulse -width modulation (PWM) control modulation (PWM) control