On the concept of the multi-source inverter

This paper presents an inverter topology, which aims to connect several DC sources to the same AC output using a single stage of conversion. This topology has been given the name of multi-source inverter. This concept has been developed for applications such as hybrid electric powertrains. Specifically, this topology allows different DC-link voltages to drive a traction motor using the battery voltage as one of the voltage levels. Thus, the DC/DC converter used in hybrid powertrain architectures can be downsized by reducing its power rating. In this paper, the multi-source inverter topology is introduced and its different operating modes are determined through an analysis of the inverter circuit. Closed-loop simulations with an interior permanent magnet (IPM) synchronous machine were performed to verify the theoretical principles of operation. A scaled-down prototype was built and successfully tested in open loop control with an RL load. The experimental results verify the effectiveness of the proposed topology and concept.