A Charge-Nonlinear-Carrier-Controlled Reduced-Part Single-Stage Integrated Power Electronics Interface for Automotive Applications

The current research trend to increase the power density of power electronics interfaces in automotive applications is the cost-effective integration of power converters. This paper proposes a reduced-part integrated power electronics interface that is capable of charging the battery and adjusting the voltage levels of a battery and a dc link during propulsion and regenerative braking. In the proposed topology, one inductor is shared between a dc/dc converter and a charger, eliminating the need for an additional magnetic component for the charging stage. A charge nonlinear-carrier control (NLC) method, which reduces the feedback circuitry, is adopted, and different nonlinear reference voltage waveforms are generated for each half-cycle of the grid to ensure a unity power factor and stable operation. To verify the concept, a 750-W prototype has been built and tested for each operation mode.