A Non-Isolated Single-Input Multiple-Output DC-DC Converter for Auxiliary Power Loads in Electric Vehicle Applications

This paper comprises the analysis and design of a non-isolated Single-Input Multiple-Output (SIMO) DC-DC converter topology for an Auxiliary Power Module (APM) in an electric vehicle. The conventional multiple output DC-DC converters have restrictions on variations of duty ratio, output voltages, inductor currents, and cross-regulation issue that occurs during variation of load. This paper proposes a SIMO topology that overcomes the limitations mentioned earlier by producing separate outputs without impacting the functions of other loads by isolating them. The variation of load current in either of those outputs does not affect the output voltages in other output terminals. The proposed Single-Input Triple-Output (SITO) converter is a 100W prototype and designed to furnish three output voltages of 24V, 12V, and 5V to supply the onboard electric motor and other auxiliary loads of an electric vehicle.