Power supply device and image forming apparatus

摘要

A power supply device controls drive of a synchronous rectification switch unit by converting a voltage into a current, and comparing a voltage obtained by current-to-voltage conversion with a predetermined value.

主权项

1. A power supply apparatus comprising:
a switching element connected to a secondary winding of a transformer and configured to switch a voltage generated in the secondary winding of the transformer; a voltage-to-current conversion unit configured to convert a change of a voltage at a terminal of the switching element on a side of the secondary winding of the transformer and a change of a voltage at a terminal of the switching element on a voltage output side into respective currents; a current-to-voltage conversion unit configured to convert the respective currents output from the voltage-to-current conversion unit into respective voltages; and a comparator unit configured to compare the respective voltages output from the current-to-voltage conversion unit, wherein a switching operation of the switching element is controlled by a signal output from the comparator unit.