7.11. Resonant DC–DC Converters
The combination of suitable power electronics topologies and switching strategies can overcome the switching power losses and EMI in high switching frequencies which can be up to a few MHz. This is accomplished by incorporating resonant circuits in conventional converter topologies so that zero voltage switching (ZVS) or zero current switching (ZCS) conditions can be created for the semiconductor switches. This type of switching is called soft switching in contrast to the PWM or the so-called hard switching that was examined in the previous sections of this chapter. Fig. 7.39 shows the voltage and current waveforms of various soft switching combinations when the semiconductor switch goes from one state to the other ...
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