| 摘要 |
<p>Provided is a DC-DC converter wherein three half-bridge type current resonant DC-DC converters having a phase difference of 120 degrees are connected in series to be operated at an operation frequency higher than the resonant frequency. Each of the three half-bridge type current resonant DC-DC converters is provided with a transformer having a primary winding, a secondary winding and a tertiary winding; a series circuit wherein a first switching element and a second switching element are connected in series to the both ends of a direct current power supply; a series circuit wherein a resonance reactor, the primary winding of the transformer and the resonant capacitor are connected in series at the both ends of the first switching element or the second switching element; and a rectifier circuit for rectifying a voltage generated at the secondary winding and outputting the rectified voltage to a smoothing capacitor. The tertiary windings and the reactor are connected in a ring-shape.</p> |
