HYBRID TRANSFORMER ZVS/ZCS DC–DC CONVERTER FOR PHOTOVOLTAIC MODULE APPLICATIONS
- The presented converter
utilizes a hybrid transformer to incorporate the resonant operation mode into a
traditional high boost ratio active-clamp coupled-inductor pulse-width-modulation
dc– dc converter, achieving zero-voltage-switching (ZVS) turn-on of active
switches and zero-current-switching turn-off of diodes.
- As a result of the
inductive and capacitive energy being transferred simultaneously within the
whole switching period, power device utilization (PDU) is improved and magnetic
utilization (MU) is optimized.
- The improved PDU allows reduction of the silicon
area required to realize the power devices of the converter.
- The optimized MU
reduces the dc-bias of magnetizing current in the magnetic core, leading to
smaller sized magnetics.
- Since the magnetizing current has low dc-bias, the
ripple magnetizing current can be utilized to assist ZVS of main switch, while
maintaining low rootmean- square (RMS) conduction loss.
- The voltage stresses on
the active switches and diodes are maintained at a low level and are
independent of the wide changing PV voltages as a result of the resonant
capacitor in series in the energy transfer loop.
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