| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a conventional power-supply device is not suitable for a power supply having a high output voltage Vo.SOLUTION: A switching power-supply device includes an inductor 22, a switch element 23, and two voltage conversion sections 30-1 and 30-2 having the same configuration. The voltage conversion section 30-1 has switch elements 31-1 and 34-1, a transformer 32-1, and rectifying elements 33-1 and 35-1. Capacitors 36-1 and 36-2 of the voltage conversion sections 30-1 and 30-2 are connected in series between output terminals 40-1 and 40-2. The switching power-supply device further includes voltage difference detection means 42 for detecting the voltage difference between the capacitors 36-1 and 36-2 and outputting a detection result, and correction means 43 for correcting on-time of the switch element 31-1 and/or the switch element 34-1 on the basis of the detection result so that the voltage difference is less than or equal to an allowable value. |
