earticle

영어

As electric vehicles’ battery voltage is increased from 400 V to 800 V, low-voltage DC/DC converter (LDC) is required to regulate low output voltage for electronic loads over the high and wide input voltage range of 350–800 V. The entire input voltage range can be divided into two: low and high input voltage ranges. This paper proposes the integrated DC/DC converter, which has two operational modes in these ranges. The proposed converter operates as a three-switch double-ended active clamp forward converter in the low input voltage range and an asymmetric half-bridge converter in the high input voltage range. With two operational modes, the proposed converter can have reductions of the voltage stresses on the switches and DC offset current of the transformer compared with the conventional converters. Thus, it can achieve high efficiency under the entire input voltage range. The proposed converter is verified by a 350–800 V input and 13.9 V/600 W output laboratory prototype.