I n designing conventional switching converte rs, the effort to increase operating frequ ency in order to reduce weight, size and c ost of magnetic and filter elements is cons tantly hampered by higher switching st resses and switching losses.To overcome thes e ob~tacles, the concept of resonant switch was proposed . By incorporating additiona l Land C elements to shape device current and voltage waveforms, the desired zero-current switching property can be realized whic h enables converters to operate in the megahertz range.
In searching for a general "zero-currentswitching" technique for DC-DC converters, the concept of resonant switches is developed. As a combination of switching device and LC network, the resonant switch offers advantages of quasi-sinusoidal current waveforms, zero switching stresses, zero switching losses, self-commutation, and reduced EMI.Furthermore, application of the resonant switch concept to conventional converters leads to the discovery of a host of new converter circuits.
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