Technology for reducing circuit oscillations and ripple in a high-voltage power supply using a piezoelectric transformer

摘要

A high-voltage power supply comprises the following components. A piezoelectric transformer outputs a voltage in accordance with a supplied drive frequency. A rectification part is connected to an output side of the piezoelectric transformer. A drive frequency generating part generates the drive frequency supplied to the piezoelectric transformer. A voltage detection part detects an output voltage of the piezoelectric transformer or the rectification part. A control part controls the drive frequency generating part such that a drive frequency corresponding to the output voltage detected by the voltage detecting part is generated. A first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the rectification part. A third time constant, which is a time constant of the voltage detecting part, is smaller than the second time constant.

主权项

1. A high-voltage power supply comprising:
a piezoelectric transformer that outputs a voltage in accordance with a drive signal; an output part that is connected to an output side of the piezoelectric transformer; a drive signal generating part that generates the drive signal supplied to the piezoelectric transformer; and a control part that controls a frequency of the drive signal so as to control the voltage from the output part, wherein a first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the output part.