Soft-Switching Full-Bridge PWM DC–DC Converter With Controlled Output Rectifier and Secondary Energy Recovery Turn-Off Snubber

ZVZCS PWM DC-DC Converter with Controlled Secondary Rectifier for ARC Welding

“…Snubber capacitors C C5, and C C6 reduce the rate of rise of the drain-source voltage of secondary transistors T 5 ,and T 6 and thus zero voltage turn off is ensured [18], [19].…”

“…Using an active output rectifier in the secondary side of the converter is another very effective way, how to decrease circulating currents in the PWM converters and, at the time, to achieve reduction of switching losses [13] - [19].…”

“…The paper is linked to article [19], where the principle of the converter working as a voltage source is explained and basic equations for rated load are derived. The application and control features of the converter operating as a current source are presented here.…”

“…The application and control features of the converter operating as a current source are presented here. Moreover, the converter analysis, presented in [19] for rated load, is extended also for light load in this paper. This is important for the converters operating at full load range -from no-load to short circuit, e. g. at converters for arc welding.…”

An Inherent Zero-Voltage and Zero-Current-Switching Full-Bridge Converter with No Additional Auxiliary Circuits

“…A series of zero-voltage and zero-current-switching (ZVZCS) techniques has been proposed to solve the IGBT tail current issue in the lagging leg (e.g., primary impedance blocking, primary resetting, secondary voltage clamping, and output voltage resetting) [7]- [12]. These auxiliary circuits are almost inevitable, and negative effects should also be considered (e.g., steady-state primary current overshoot and additional high-voltage stress of the rectifier during the start-up period).…”