| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply whose specifications can be changed easily and that has low loss. SOLUTION: A power conversion part 12 generates a DC output in accordance with a pulse signal 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 by the A/D conversion part 35 and a reference value. A pulse width calculation part 53 calculates the 'on' time of the pulse signal that is given to the power conversion part 12 based on the output of the digital filter 52. This 'on' time is stored in an 'on' time register 62. The PWM part 11 generates the pulse signal to give it to the power conversion part 12 based on a cycle set in a cyclic register 61 and the 'on' time written in the 'on' time register 62.
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