Harmonic attenuator module doubles power density, cuts components

Vicor Corp. recently introduced its high-boost VI-HAM (Harmonic Attenuator Module), a universal ac input, PFC front-end module optimized for use with the company’s V375 Series dc-dc converters.


Vicor high-boost Harmonic Attenuator Modules have versions that can be configured in parallel for applications requiring more than 600 W output power.

Vicor Corp . recently introduced its high-boost VI-HAM (Harmonic Attenuator Module), a universal ac input, PFC front-end module optimized for use with the company’s V375 Series dc-dc converters. One VI-HAM unit can be used with any combination of V375 converters—which come in quarter-, half-, and full-brick packages—up to 600 W output power. The resulting power-conversion system has twice the power density, fewer components, and lower cost than previous VI-HAM based solutions, says Vicor.

VI-HAM consists of a full-wave rectifier and a proprietary high-frequency zero-current switching (ZCS) boost converter. Features include active inrush current limiting, over-temperature and short-circuit protection, control, and housekeeping circuitry. Users need only to provide external hold-up capacitors, “a few components,” and Vicor's 07818 line filter, says the company.
Available from stock, high-boost VI-HAM devices are priced the same as the existing VI-HAM family (starting at $99 in quantities of 5,000).

—Frank J. Bartos, executive editor, Control Engineering, fbartos@reedbusiness.com

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