A Modular DC-Link Capacitor Solution for the Main Powertrain Inverter of xEVs

Abstract:
This paper describes a novel approach for a DC-link film capacitor for the main power train of xEVs. With an understanding of the challenges and requirements, the approach targets standardizing the capacitor design for this application. A design concept of the capacitor is validated with simulations and laboratory test data. The paper does not intend to disclose all aspects of product design and process, but it will show why it can be a flexible solution for system engineers by its modularity and usage. These capacitors are connected through an external busbar to the power modules (and these to the motor) and additional circuitry, such as the battery or EMI filters. This standardized approach will simplify the development efforts for circuit designers as well as engineering costs.