| 摘要 |
PURPOSE:To restore quickly a certain high voltage from the variance by provid ing a voltage terminal in a part of a high voltage rectifying circuit and changing the driving frequency of a driving circuit in accordance with the voltage of the voltage terminal. CONSTITUTION:A voltage doubler rectifying circuit is connected to a generating part electrode 5 of a piezoelectric transformer 3, and the high output voltage generated from this voltage doubler rectifying circuit is applied to an anode A of a cathode-ray tube. Normally, the voltage at a point A is changed more greatly than the current flowed to a resistance 10, and voltages in bleeder voltage generating parts F and B are changed approximately in proportion to this change. A voltage varied approximately in proportion to the voltage at the point A, for example, the voltage at the point B is detected to change driving voltage frequency of a driving voltage generating part VCO of the transformer in such direction on a basis of the boosting ratio-frequency characterictic that the voltage at the point A is stabilized. Thus, the variance of the output voltage due to the variance of load current, the variance of temperature, and a change with the lapse of time is prevented.
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