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

Author

Hamamura, Sunao ; Ninomiya, Tamotsu ; Yamamoto, Mitsuru ; Katsuno, Masafumi

Author_Institution

Second Devices Dev. Dept., NEC Eng. Ltd., Kawasaki, Japan

Volume

18

Issue

1

fYear

2003

fDate

1/1/2003 12:00:00 AM

Firstpage

270

Lastpage

277

Abstract

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.

Keywords

AC-DC power convertors; PWM power convertors; controllability; piezoelectric devices; pulse frequency modulation; transformers; voltage control; 0.57 to 1.4 A; 107 kHz; 17 V; 86 percent; 90 to 270 V; AC/DC converter; combined PWM and PFM control; control method; controllability; input voltage variation; output voltage control; piezoelectric transformer; printed circuit board; pulse frequency modulation; pulse width modulation; DC-DC power converters; Frequency modulation; Magnetic noise; National electric code; Printed circuits; Pulse transformers; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Voltage control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2002.807177

Filename

1187346