| 摘要 |
<p>Provided is a DC-DC converter wherein an insulated high-frequency transformer is provided and a voltage resonant circuit composed of a switching circuit is connected to the primary side of a first transformer. An inductance is connected in series between the terminal on the secondary side of the high-frequency transformer and an output terminal, a second switching circuit is connected between the secondary side and the output terminal so as to be alternately switched therebetween, and a voltage is outputted via a rectifying circuit and a smoothing circuit. The voltage resonant circuit is switched by means of first switching signals, and the frequency of the first switching signals is set higher than a reference frequency when the output voltage is larger than a target voltage, and when the output voltage is smaller than the target voltage, the frequency of the first switching signal is set lower than the reference frequency.</p> |
