Patent ID: 8983329
Filing Date: 2015-03-17
Classification: G03G,H02M

Abstract:
1. A high-voltage power supply device comprising: a piezoelectric transformer; a driving unit of said piezoelectric transformer; a detection unit configured to detect an output of said piezoelectric transformer; and a control unit configured to control the output of said piezoelectric transformer by giving a driving signal to said driving unit so that the output detected by said detection unit reaches a target value, wherein said control unit changes a frequency of the driving signal without changing a duty of the driving signal so as to set the frequency of the driving signal such that the output detected by said detection unit falls within a predetermined range including the target value, and after setting the frequency for the driving signal such that the output detected by said detection unit falls within the predetermined range, changes the duty of the driving signal so that the output detected by said detection unit reaches the target value.