POWER SUPPLY DEVICE AND METHOD FOR CONTROLLING POWER SUPPLY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a power supply device capable of easily changing its specifications and reducing losses. SOLUTION: A power conversion part 12 generates a DC output in accordance with a pulse signal generated from a PWM part 11. An A/D conversion part 35 converts the output voltage of the power conversion part 12 into digital data. A digital filter 52 amplifies a difference between the digital data outputted from the A/D conversion part 35 and a reference value. A pulse width calculation part 53 calculates the ON time of the pulse signal to be applied to the power conversion part 12 based on an output from the filter 52. The ON time is written in an ON time register 62. The PWM part 11 generates a pulse signal in accordance with a period set up in a period register 61 and the ON time written in the register 62 and applies the pulse signal to the power conversion part 12.