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L6699 LLC Resonant Half-bridge Controller IC Slide 7

Most resonant converters work in a similar manner. The AC sinusoidal voltage and current waveforms periodically change their polarity and go through zero at the polarity crossover points. The resonant controller senses those zero-voltage crossings and turns the switching devices ON and OFF at or very near to those zero crossing points, which minimizes the switching losses.

PTM Published on: 2013-02-27