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Combined PWM and PFM control for universal line voltage of a piezoelectric transformer off-line converter

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4 Author(s)
S. Hamamura ; Second Devices Dev. Dept., NEC Eng. Ltd., Kawasaki, Japan ; T. Ninomiya ; M. Yamamoto ; M. Katsuno

A new control method for an AC/DC converter using a piezoelectric transformer is presented. The combination of pulse width modulation and pulse frequency modulation makes it possible to control the output voltage, and its adaptability to a worldwide range of input voltage variation. The AC/DC converter implemented on a printed circuit board is experimentally evaluated, and as a result, good controllability is successfully achieved. The highest efficiency of 86% was obtained at an input voltage of AC 90-270 V, output voltage of 17 V, load current of 0.57-1.4 A, and operating at frequencies around 107 kHz.

Published in:

IEEE Transactions on Power Electronics  (Volume:18 ,  Issue: 1 )