Abstract:
Current source drivers (CSDs) have been reduce the switching loss and gate drive loss in megahertz (MHz) dcdc converters, in which the duty cycle normally has a steady-state value. However, different from dc-dc converters, the
duty cycle of the power factor correction (PFC) converters is modulated fast and has a wide operating range during a
half-line period in ac –dc applications. An adaptive full-bridge CSD is used as a boost PFC converters. The CSD can
build adaptive drive current inherently depending on the drain current of the main power MOSFET. Compared to the
CSDs with the constant drive current, the advantage of the adaptive drive current is reduce the switching loss further
when the MOSFET is with a higher switching current, while m inimizing the drive circuit loss when the MOSFET is with
a lower switching current. Therefore, the adaptive CSD is able to realize better design trade-off between the switching
losses and drive circuit loss so that the efficiency can be optimized in a wide operation range. Furthermore, no additional
auxiliary circuit and control are needed to realize the adaptive current. A full bridge (FB) inverter at the back end of dcdc converter completes the ac- ac conversion. This circuit enables to provide controlled and regulated ac output. The ACAC converter is designed and simulated using MATLAB 2010 and waveforms are analysied. Simulation results
demonstrate that the output voltage of the desired converter can be maintained at 349 V ac and Power factor can be
improved upto 0.909
