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Zero Voltage Switching (ZVS) technique minimizes the turn-on loss of the MOSFETs in LLC resonant converter structure. However, as switching frequency increases, the converter efficiency will suffer due to the increased turn-off loss and gate charge loss, and these effects are especially problematic at light load conditions, where the switching frequency has to be further increased in order to regulate...
This paper studies three fundamental switching patterns for resonant converters to achieve Zero Voltage Switching (ZVS) operation. To evaluate the performance of the three control methods, three resonant topologies are taken into consideration: series resonant, parallel resonant and series-parallel resonant. The criteria functions for ZVS operation are derived for each control method and topology...
A modified zero-current-switched quasi-resonant (ZCS-QR) boost converter is employed in a power factor correction (PFC) application. The main goal is to achieve a small-size low-noise PFC circuit based on single-switch boost topology. A clamp diode has been added to avoid the voltage ringing problem that is originally generated across the ZCS-QR switch during its turn-off period. The converter operation...
Very low frequency (VLF) high-voltage (HV) sinusoidal test waveforms are suitable for testing characteristics and insulation qualities of long buried power cables. Unlike as with conventional PWM converters, a newly developed LCC resonant inverter combined with a symmetrical three-stage voltage multiplier rectifier is introduced in this paper to generate VLF HV sinusoidal waves. Due to the wide ranges...
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