Title :
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
fDate :
1/1/2003 12:00:00 AM
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;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2002.807177
