| 摘要 |
<p>PURPOSE:To obtain the piezoelectric transformer with high reliability and simple structure and the oscillation circuit with simple circuit configuration employing the piezoelectric transformer. CONSTITUTION:The piezoelectric transformer consists of a piezoelectric ceramic rectangular plate whose length in the lengthwise direction is 2/3 wavelength and electrodes formed thereon. The input electrode 22 covers the part of almost 1/3 from one end and has a partial electrode 24. A ground electrode 23 is placed to a face opposite to the input electrode 22. Output electrodes 26, 26' are formed to a position by 1/6 wavelength from the other end of the rectangular plate and polarization electrodes 25, 25' are formed to a position by 1/6 wavelength from the output electrodes. The electrodes 26, 26' and 25, 25' are connected respectively. A DC high voltage is applied to the electrodes 22, 23 to polarize the plate in the broadwise direction. Furthermore, a high DC voltage is applied between the electrodes 25 and 26 to polarize reversely the plate in the lengthwise direction. The oscillation circuit employing the piezoelectric transformer amplifies partial power from the electrode 24 via a phase shift circuit and feeds back it to the input electrode.</p> |
