The growing demand for higher power density and low
profile in power converter designs has forced designers to
increase switching frequencies. Operation at higher
frequencies considerably reduces the size of passive
components such as transformers and filters. However,
switching losses have been an obstacle to high frequency
operation. In order to reduce switching losses, allowing high
frequency operation, resonant switching techniques have been
developed [1-7]. These techniques process power in a
sinusoidal manner and the switching devices are softly
commutated. Therefore, the switching losses and noise can be
dramatically reduced. Conventional resonant converters use an
inductor in series with a capacitor as a resonant network. Two
basic configurations are possible for the load connection;
series connection and parallel connections.