Design and Analysis of a New Drive-Integrated Auxiliary Dc-Dc Converter for Hybrid Vehicles

Cost, volume and weight are three major driving forces in the automotive area. This is also true for hybrid electric vehicles, which attract more and more attention due to increasing fuel costs and pollution. Since the energy distribution system causes a significant share of the volume/costs, a new concept for integrating dc-dc converters, which transfer the power between the low- and high-voltage buses, in the inverter/drive system is presented in this paper. There, the basic operation principle, analytical design equations and control strategies for improving the efficiency are explained. These considerations are validated by simulations and measurements.