Design and Analysis of a High-Voltage-Gain Step-Up Resonant DC–DC Converter for Transportation Applications

Conventional power take-off (PTO) system in the automotive applications has shown some disadvantages such as low efficiency and high fuel consumption. Electrification for PTO system used in specialty vehicles requires the application of high-gain step-up dc-dc converter. A new candidate topology for high-voltage-gain step-up dc-dc converter using resonant technology has been proposed in this paper. In addition to its high voltage gain and wide input range, it also brings the benefits of low input current ripple, reducing current stress in switching devices and transformer, ZVS in two power MOSFETs, and ZCS in the rectifier diode operation over the full load range and high efficiency. Interleaved step-up topology helps the circuit to reduce the stress on the components, while it also decreases the transformer requirements. Series resonant tank is used to achieve ZVS and ZCS as well as extended voltage control. Detailed design analysis shows the impact of the transformer turns-ratio and resonant tank to the other circuit components. The input current ripple is also determined by the operating duty range. A 2-kW prototype has been built according to the design rules. The experimental results are used to verify the circuit operation and design analysis. A peak efficiency of 95.5% has been achieved for the prototype, and it shows an efficiency improvement compared with several other topologies.