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This paper proposes a power-loss reduction technique for a kW-scale isolated dc-dc converter, which installs a novel PWM control to achieve the soft-switching of primary side MOS-FETs. As a result, the efficiency is achieved over 90% in a wide load range. Moreover, the temperature of the primary side MOS-FETs can be reduced by 30 degrees when compared with the conventional method, and the power-density...
Magnetic saturation phenomenon in low-voltage and high-current DC-DC converter with fast dynamic response is described. Core saturation presented here is observed in onboard isolated DC-DC converter due to inherent asymmetrical driving of conventional PWM IC in transient condition. The saturation is not eliminated by using capacitor for AC coupling of transformer. Mechanism of the saturation is analyzed...
This paper outlines a soft-switching mechanism based on zero-voltage-zero-current-switching (ZVZCS) principle for the front-end isolated DC/DC converter of an isolated three-phase rectifier-type high-frequency-link bidirectional power converter. In conjunction with a back-end DC/AC converter operating with a novel patent-filed hybrid modulation scheme outlined in , , and that reduces the number of...
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