Title :
Piezoelectric transformer operating in thickness extensional vibration and its application to switching converter
Author :
Zaitsu, T. ; Ohnishi, O. ; Inoue, Takeru ; Shoyama, M. ; Ninomiya, T. ; Lee, F.C. ; Hua, G.C.
Author_Institution :
NEC Corp., Kawasaki, Japan
Abstract :
A new type of piezoelectric transformer (PT) power converter incorporating the ZVS technique is presented. A combination of the ZVS technique and the PT successfully achieves higher efficiency. For low output voltage, using half-bridge rectifier stage, the converter achieved 72% efficiency, at Vin=80 V, Vo=11.8 V, and Po=5 W. For medium output voltage, using full-bridge rectifier stage, the converter achieved 83% efficiency at Vin=80 V, Vo=40 V, and Po=10.7 W
Keywords :
bridge circuits; piezoelectric devices; power convertors; power transformers; rectifiers; rectifying circuits; switching circuits; 10.7 W; 11.8 V; 40 V; 5 W; 72 percent; 80 V; 83 percent; ZVS; full-bridge rectifier stage; half-bridge rectifier stage; medium output voltage; output voltage; piezoelectric transformer; power converter; switching; Low voltage; Magnetic resonance; Medium voltage; National electric code; Power electronics; Power transformer insulation; Rectifiers; Resonant frequency; Stress; Switches; Switching converters; Vibrations; Zero voltage switching;
Conference_Titel :
Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE
Conference_Location :
Taipei
Print_ISBN :
0-7803-1859-5
DOI :
10.1109/PESC.1994.349677
