Patent ID: 8686657
Filing Date: 2014-04-01
Classification: H02M,H05B,Y02B

Abstract:
1. A power supply device, comprising: a converter that supplies electric power by performing an ON and OFF operation of a switching element; a voltage detector that detects a voltage value of a first output voltage of the converter; a conversion circuit that converts the voltage value into a digital value; an arithmetic circuit that receives an operation clock signal and that calculates a control command value based on the digital value from the conversion circuit; a pulse signal generation circuit that outputs a pulse signal of a duty ratio that is determined based on the control command value; a ramp signal generation circuit that outputs a ramp signal synchronized to a clock signal generated based on the operation clock signal; an integration circuit that receives the pulse signal and that outputs a second output voltage; and a driving signal generation circuit that generates a driving signal based on a comparison result of the ramp signal with the second output voltage from the integration circuit, wherein the switching element performs the ON and OFF operation according to the driving signal.