Rompower has a long-standing tradition in automotive power technologies, beginning in 1992 with the development of an auxiliary battery charger for the GM’ EV1. Between 1996 and 1998, Rompower licensed its automotive power technology to Siemens Automotive in Würzburg. Following its acquisition by Delta Electronics, Rompower engineered the on-board charger for the Chevy Volt (GM) and later developed charging solutions for Tesla and several European automotive manufacturers.
Most recently, as part of Rompower Energy Systems, the company has advanced automotive technologies to address modern requirements. A key development is an auxiliary battery charger capable of operating seamlessly from both 400V and 800V main batteries. These innovations not only meet current industry needs but also support the broader adoption of Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H) applications. Rompower’s technologies are designed for advanced bidirectional EV chargers, providing reliable operation across a range of charging and discharging voltages.
Figure 1
Figure 1 presents a 2.3 kW auxiliary battery charger utilizing proprietary multilayer PCB magnetics. This design significantly reduces common-mode noise and enables highly efficient operation, while also minimizing size, weight, and cost. The advantages of Rompower’s solutions stem from the integration of proprietary magnetics, advanced noise suppression, innovative power conversion, and intelligent control strategies.
A novel DC-DC conversion technology for auxiliary battery chargers capable of operating from an 800 V bus with a very wide input voltage range. This solution leverages high-power-density magnetics with reduced copper content, delivers outstanding efficiency and very high power density, and achieves near-zero common-mode noise through a novel architecture, making it particularly well suited for next-generation automotive platforms.
With over 33 years of expertise in automotive power electronics, Rompower has established itself as a leader in efficiency, power density, and cost-effectiveness. The company has generated 42 patents in power conversion, spanning circuit topologies, magnetic technologies, and packaging innovations. Many of these patents have direct application to modern automotive power electronics.
With its proven expertise, Rompower offers advanced engineering solutions tailored for these demanding applications, ensuring efficiency , scalability and cost effectiveness.
