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This study proposes an output regulation method for a piezoelectric transformer (PT)-based power converter that employs an inductorless half-bridge topology for achieving zero-voltage switching (ZVS). The resonant current is first estimated at the input section of the PT. These data are used to indicate the effective signs for zero-voltage switching, applied to a phase-locked loop (PLL) as a reference input, to generate the in-phase gate drive signals with an adequate deadtime. Practical results show successful operation of the PLL controller. This technique is extended to achieve output regulation by a burst-mode hysteresis control. Experimental results demonstrate good agreement with the SPICE-based simulation for output regulation while achieving zero-voltage switching.
Inspec keywords: power transformers; zero voltage switching; voltage control; SPICE; bridge circuits; piezoelectric devices; phase locked loops; power convertors
Subjects: Power electronics, supply and supervisory circuits; Piezoelectric devices; Modulators, demodulators, discriminators and mixers; Power convertors and power supplies to apparatus; Control of electric power systems; Transformers and reactors; Voltage control