VOLTAGE GENERATING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME

摘要

Until an output voltage of a converter reaches a threshold value, a control part performs switching control, and after the output voltage reaches the threshold value, the control part performs supply voltage control while the state of a switching control signal at the time when the output voltage reaches the threshold value is maintained. Switching control is a control method in which the output voltage is adjusted by adjusting the frequency or duty ratio of the switching control signal that drives a driving part. Supply voltage control is a control method in which the output voltage is adjusted by adjusting the supply voltage that is applied to the primary side of the converter.

主权项

1. A voltage generating apparatus comprising:
a step-up transformer; a switch circuit configured to drive the step-up transformer; a signal generation unit configured to generate a switching control signal for driving the switch circuit; a voltage supply circuit configured to generate a supply voltage for the primary side of the step-up transformer; a setting value determining unit configured to determine a setting value for the supply voltage from the voltage supply circuit; a voltage detection circuit configured to detect an output voltage on the secondary side of the step-up transformer; and a control unit configured to control the switch circuit and the voltage supply circuit, wherein the control unit is further configured to, until the output voltage reaches a threshold value before reaching a target value, perform switching control in which the output voltage is adjusted by adjusting the frequency or the duty ratio of the switching control signal, and the control unit is further configured to, after the output voltage reaches the threshold value, perform supply voltage control in which the output voltage is adjusted by adjusting the supply voltage while the state of the switching control signal at the time when the output voltage reached the threshold value is maintained.