| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a stable high-voltage output with good controllability by using a piezoelectric transformer. <P>SOLUTION: A high-voltage controller 100 divides a clock CLK output from an oscillator 90 to output a driving pulse S100. A piezoelectric transformer driving circuit 210 drives a piezoelectric transformer 220 to output an AC high voltage, based on the driving pulse S100. The AC high voltage is converted into a DC high voltage by a rectification circuit 230. At this time, output current supply means 241 supplies a current to the rectification circuit 230. This current is converted into a voltage by current-to-voltage conversion means 242. The output voltage S240 is input to an ADC 102 and converted into a digital data. The high-voltage controller 100 compares the digital data converted by the ADC 102 with digital data corresponding to a target current equivalent voltage value instructed by a printer engine controller 60, and controls an output frequency of the driving pulse S100 so that the both digital data become the same. <P>COPYRIGHT: (C)2012,JPO&INPIT |
