| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the output voltage from a piezoelectric transformer control circuit becomes unstable when it is turned on from off at high-speed on/off operation with a frequency of several Hz to several hundreds Hz, and the cost is increased because the number of components increases. SOLUTION: A high-voltage DC power supply includes a piezoelectric transformer which outputs an applied input voltage while transforming, a voltage doubler rectifier unit which transforms and rectifies the output voltage from the piezoelectric transformer to produce a high DC voltage, a DC high voltage output unit which outputs the output from the voltage doubler rectifier unit to the outside, an output detection unit which detects a DC signal produced by transforming and rectifying the output voltage from the piezoelectric transformer, and a PWM control unit which varies the pulse width of the input voltage being applied to the piezoelectric transformer according to an output voltage variable signal which varies based on a set function formula, and the comparison results of a signal detected by the output detection unit and the output voltage variable signal, wherein the DC high voltage output unit is turned on/off by turning the output voltage variable signal on/off each predetermined time. COPYRIGHT: (C)2010,JPO&INPIT
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