Steady-State Characteristics of the Push-Pull Piezoelectric Inverter

Masahito SHOYAMA  Kuniyasu HORIKOSHI  Tamotsu NINOMIYA  Toshiyuki ZAITSU  Yasuhiro SASAKI  

IEICE TRANSACTIONS on Communications   Vol.E82-B   No.8   pp.1318-1325
Publication Date: 1999/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Power Supply
piezoelectric transformer,  push-pull inverter,  CCFL,  ZVS,  

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Steady-state characteristics of the push-pull inverter with a piezoelectric transformer are analyzed. The piezoelectric transformer operating in the 3rd-order longitudinal vibration mode is used in place of a conventional magnetic transformer to produce a high output voltage to light up a cold cathode fluorescent lamp. The circuit operation, the load characteristics, the efficiency and the ZVS conditions are analyzed using equivalent circuits. These analytical results are confirmed by experiments. An example of the output current control is also shown.