POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS

摘要

The power supply apparatus includes a transformer having primary and secondary sides, a switching element, a feedback unit, a conversion unit that converts a current flowing in a primary winding of the transformer into a voltage, a control unit that controls operation of the switching element, a voltage switching unit that increases the voltage output from the conversion unit and feeds the increased voltage to the control unit when a continuous oscillation state is transited to an intermittent oscillation state. The voltage switching unit switches the voltage of the power supply that is input into the control unit to be higher when the continuous oscillation state is transited to the intermittent oscillation state.

主权项

1. A power supply apparatus, comprising:
a transformer having a primary winding on a primary side and a secondary winding on a secondary side; a switching element configured to performs switching operation to turn on or turn off a current flowing in the primary winding; a feedback unit configured to output a voltage corresponding to a voltage generated in the secondary winding; a conversion unit configured to convert the current flowing in the primary winding of the transformer into a voltage; a control unit configured to control operation of the switching element based on the voltage output by the feedback unit and the voltage output from the conversion unit; and a voltage switching unit configured to increase the voltage output from the conversion unit and supply the increased voltage to the control unit, when the switching element is transited from a continuous oscillation state to an intermittent oscillation state, the continuous oscillation state causing the switching element to continuously oscillate in a predetermined cycle, the intermittent oscillation state causing the switching element to intermittently oscillate in a cycle longer than the predetermined cycle.