Patent ID: 9190914
Filing Date: 2015-11-17
Classification: H02M

Abstract:
1. A switching power supply apparatus comprising: a transformer including an input unit, a main output unit, and a sub-output unit; a switch circuit that switches between application of and stopping application of a voltage to the input unit; a main rectifying and smoothing circuit that rectifies and smoothes an induced voltage received from the main output unit and outputs a main output voltage; a converter unit that steps up or steps down the main output voltage and outputs stepped up or stepped down voltage to a main load in a subsequent stage; a sub-rectifying and smoothing circuit that is provided in the sub-output unit and, through switching of a switch device, rectifies and smoothes an induced voltage received from the sub-output unit and outputs the rectified and smoothed voltage to a sub-load connected to the sub-rectifying and smoothing circuit; a first control unit that performs switching control of the switch circuit based on a feedback signal corresponding to the main output voltage; a second control unit that, based on a set target value, performs switching control of the switch device of the sub-rectifying and smoothing circuit and drives the sub-load; a detection unit that detects information regarding a load status of the main load; and a changing unit that changes the target value based on the information detected by the detection unit.