Patent ID: 9621061
Date: 2017-04-11
CPC Classifications: B41J,H02M

Claim:
1. A power supply apparatus comprising: a first converter configured to convert an input direct current voltage into a first direct current voltage by switching a first switching element, and to output the first direct current voltage; and a second converter configured to convert the first direct current voltage output from the first converter into a second direct current voltage lower than the first direct current voltage by switching a second switching element and to output the second direct current voltage, wherein the first converter is further configured to output a third direct current voltage lower than the second direct current voltage by switching the first switching element at a second switching frequency lower than a first switching frequency of the first switching element when the first convertor outputs the first direct current voltage, wherein the second convertor controls an operation of the second switching element so as to output the third direct current voltage input from the first convertor.