Concept of resonant switch converters

In switch mode converter topologies,an LC resonance can be utilized primarily to shape the switch voltage and current to provide zero voltage and or zero current switching’s. In such resonant switch converters, during one switching frequency time period, there are resonant as well as noresonant operating intervals.

Types of resonant switch DC-DC converter

The output of resonant switch circuit is controlled by controlling the operating frequency,in other a constant frequency square wave or PWM control can be used with some additional constraints to provide zero voltage and zero cureent switchings.

Resonant switch DC-DC converters are classified in to two types.

(a)Zero Current Switching(ZCS)converters

(b)Zero Voltage Switching(ZVS)converters

Zero Current Switching(ZCS)converters

In this converter switch turns on & turns off at zero current .The peak resonant current flows through the switch but the peak switch voltage remains the same as in its switch mode counterpart.Such a topology for a step down DC-DC converter.

Zero Voltage Switching(ZVS)converters

In this converter switch turns on and turns off at zero voltage.The peak resonant voltage .Appears across the switch ,but the peak switch current remains the same as in its switch mode counterpart.Such a topology for a step down DC-DC converter