Patent ID: 9075368
Filing Date: 2015-07-07
Classification: G03G,H02M

Abstract:
1. A high voltage generating device, comprising: a transformer; a driving portion configured to drive a primary side of the transformer; a signal generating portion configured to generate a driving signal for driving the driving portion; a voltage output portion configured to output a voltage generated on a secondary side of the transformer; a voltage detecting portion configured to detect a voltage output from the voltage output portion; a current detecting portion configured to detect current flowing through the voltage output portion; and a control portion configured to raise the voltage output from the voltage output portion to an output target voltage by controlling the driving signal generated by the signal generating portion based on the voltage detected by the voltage detecting portion, the control portion raising the voltage output from the voltage output portion with a predetermined rate of change until the voltage detected by the voltage detecting portion reaches a transient target voltage smaller than the output target voltage, the control portion raising the voltage output from the voltage output portion with a rate of change smaller than the predetermined rate of change after the voltage detected by the voltage detecting portion reaches the transient target voltage, wherein the control portion changes the transient target voltage from a first target value to a second target value based on a load resistance value according to current detected by the current detecting portion.