Title :
A Novel Control Method for Piezoelectric-Transformer Based Power Supplies Assuring Zero-Voltage-Switching Operation
Author :
Alonso, J. Marcos ; Ordiz, Carlos ; Costa, Marco A Dalla
Author_Institution :
Univ. de Oviedo, Gijon
fDate :
3/1/2008 12:00:00 AM
Abstract :
In this paper, a new control strategy that allows zero-voltage-switching (ZVS) operation of power converters using piezoelectric transformers (PTs) is proposed. The control circuit operates in a closed loop by measuring the phase between the PTs resonant current and the switching pattern and adjusting the switching frequency to the optimum value so that ZVS operation is assured. An innovative nonlinear regulator based on an analog multiplexer is presented. The regulator automatically swaps the signs of the sensed signal and the reference signal to allow generation of the adequate control action. A laboratory prototype for a 6 W resonant inverter was tested; obtained experimental results are also shown.
Keywords :
nonlinear control systems; piezoelectric devices; power convertors; power transformers; zero voltage switching; ZVS operation; analog multiplexer; closed loop control; control circuit; nonlinear regulator; piezoelectric transformer; power 6 W; power converters; power supplies; reference signal; resonant inverter; zero-voltage-switching operation; Current measurement; Frequency measurement; Phase measurement; Power supplies; RLC circuits; Regulators; Resonance; Switching circuits; Transformers; Zero voltage switching; Control circuit; half bridge converter; piezoelectric transformer (PT); power supply; zero-voltage-switching (ZVS);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2007.911928
