Step-up DC-DC converter for automotive application

Electrification of vehicle accessories often requires the application of low voltage high current step up DC-DC converter with a high voltage gain ratio qualified for use in an automotive environment. The proposed topology provides step-up on low voltage side that reduces the transformer turns ratio, leading to a simplified transformer design with reduced cost and increased efficiency which is especially important with low input voltage (10-20VDC) at 2-4kW or more. Fundamental operation of the topology has been and verified by simulation in NL-5. An experimental prototype has been built, which verifies the performance and high efficiency of the circuit topology. High efficiency DC-DC (94%, 3kW and 94.5%, 10kW) prototypes have been built. This topology is a better solution for higher power at low input voltage than parallel input stages. It was compared with other topologies by cost and performance.