Switched-Capacitor-Based Integrated Double-Input Single-Output DC-DC Converter for ElectricVehicle Applications

Multi-input single-output converters play a crucial role in hybrid electric vehicle applications, regulating the voltage of different ports as well as efficiently transferring the power form source to DC bus or vice versa. An integrated double-input single-output dc-dc converter based on switched-capacitor configuration is presented in this paper, which can be employed for interfacing between sources with different voltage levels. Providing wide voltage gain range, the proposed converter can step-up the voltage of the input sources to a regulated high-voltage dc bus. Due to use of minimum number of switches, as well as the inherent shoot-through protection of switches, the proposed converter offers more reliable, efficient power conversion compared with conventional double-input converters. To achieve a high voltage-gain in step-up mode, the capacitors are charged in parallel and discharged in series. In this paper, the basic operating principles and steady-state characteristics are presented. A 1kW, 100 kHz experimental prototype is built to validate the effectiveness of the proposed concept.