Quasi-resonant converters are a separate class of switching power supplies that
tune the ac power waveforms to reduce or eliminate the switching loss within
the supply. This is done by placing resonant tank circuits within the ac current
paths to create pseudo-sinusoidal voltage or current waveforms. Because the
tank circuits have one resonant frequency, the method of control needs to be
modified to a variable frequency control where the resonant period is fixed and
the control varies the period of the non-resonant period. The quasi-resonant
converters usually operate in the 300kHz to 2MHz frequency range.
The advantages of ...
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