| 摘要 |
PROBLEM TO BE SOLVED: To reduce the switching loss of a step-down converter, in a power supply including a DC-DC converter constituted by connecting a step-down converter and a current resonance converter in series.SOLUTION: From an operation amount generated based on the output voltage of a DC-DC converter and a target value thereof, a command value for a step-down converter and a resonance converter constituting the DC-DC converter is calculated. A command value related to the time ratio of the step-down converter is maintained to 1 when the operation amount exceeds a predetermined value. A command value related to a period for adjusting the switching frequency of a resonance converter is maintained to a minimum period until the operation amount reaches a predetermined value, and changed according to the change in the operation amount when the operation amount exceeds a predetermined value. |
