948D: High Energy Density DC Link Capacitors for Larger Inverter Systems

Liberty, SC (May 2013) — Cornell Dubilier announces availability of its Type 948D high energy density DC link capacitors for larger inverter systems. Type 948D is an excellent choice for DC link applications where high bus voltage, high capacitance and high ripple current are required for smoothing and filtering.

Housed in a plastic rectangular package that is nearly a cube with 6.5 inch sides, Type 948D DC link capacitors offer up to 20% more capacitance in the same size case with lower ESR and higher ripple current ratings than competitive types. Since a fused, segmented metallization pattern is used, Type 948D capacitors offer greater open circuit protection and superior control of capacitance loss than competitive types. The pattern is deposited on a low-loss, high-grade polypropylene dielectric. Built-in fuse links limit capacitance loss to a small segment within the capacitor in lieu of the larger areas of uncontrolled capacitance loss observed with non-segmented types.

Mario DiPietro, Product Manager at Cornell Dubilier stated, "This segmented feature enhances open circuit protection, limits capacitance loss and increases reliability in critical DC link applications." He added, "CDE's advanced processing, testing and 100% burn-in greatly reduce or eliminate infant mortals and early field failures."

Available in 990 to 2700 µF and rms current ratings up to 160A, the Type 948D DC link are offered in voltage ratings ranging from 800 to 1300 Vdc. The heavy duty M10 threaded studs are used to connect the high current terminals to the inverter's bus.

"With a 200,000 hour life expectancy at nameplate ratings of current, voltage and temperature, Type 948D DC link capacitors excel at providing reliable filtering and smoothing for today's demanding applications in inverters for wind and solar energy, electric vehicles, motor drives, UPS systems and more." says DiPietro.