Rogers Corporation's Power Electronics Solutions (PES) division has developed an integrated capacitor busbar solution for solar inverters applications. The ROLINX CapEasy and ROLINX CapPerformance busbar assemblies contain integrated high-value capacitors and a laminated busbar structure for enhanced power density and low inductance requirements. By teaming low-loss laminated busbars with low-profile capacitors having low equivalent series inductance (ESL) and low equivalent series resistance (ESR), the resulting compact hybrid busbar assembly is ideal for high-density power distribution in small spaces, such as in solar inverters and DC-to-DC converters. The novel integrated busbar assemblies consist of a multilayer laminated busbar with copper or aluminum conductors and polypropylene dielectric film and a single annular capacitor. The unique low-profile format of the capacitors allows them to be mounted back-to-back on opposite sides of a laminated busbar, resulting in an extremely compact power-distribution solution with the high instantaneous current capacity needed for consistent power from a solar inverter even with changing operating and environmental conditions. ROLINX CapEasy capacitor busbar assemblies are rated for maximum DC voltage of 1.5kV and as much as 1MW power. ROLINX CapPerformance assemblies are available with voltage ratings as high as 12kV and as much as several megawatts power-handling capability. Both assemblies are fabricated with tin-plated copper conductors and designed to maintain consistent performance at operating temperatures from -40 °C to +105 ºC. The busbars are combined with capacitors valued at 75 to 1600 μF and DC voltages up to 3kV. The low-form-factor capacitors are fabricated from metallized polypropylene film protected by a molded polymeric case and usable at temperatures from -40 to +85 ºC. 

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