Vicor announced an addition to its new family of high-density PFM AC-DC front-end modules in the rugged VIA package that offers superior cooling performance and versatility in converter mounting.
Featuring a universal AC input range (85–264 V), power factor correction, and a fully isolated 24 V or 48 V d.c output, and delivering 400 W of isolated, regulated, DC output power at efficiencies up to 93%, these new modules provide power density of 8 W/cm³ in a 9 mm thin package. The new units are ideally suited for use in a broad range of industrial, process control, telecommunications, office equipment, test and measurement, LED lighting and other ‘off-line’ applications.
Every electronic product or system that operates off an AC utility line must incorporate an AC-DC front end to convert the AC utility voltage into the smooth DC voltage required by electronic circuitry. These new units integrate a full range of front-end functions required by contemporary AC line-operated power systems – transient and inrush current protection; input power factor correction; input to output isolation, and a regulated SELV (Safety Extra Low Voltage) DC output – and meet international safety and regulatory agency standards for isolation, conducted emissions, power factor correction, and susceptibility to AC line transients, flicker, interruptions and surges.
VIA package configurations are available for both on-board mounting and chassis mounting, and units are available in two operating temperature ranges.
In many applications, a user can instantly implement a complete AC-DC front end by simply combining a PFM with an AIM (Universal AC Input Module), which integrates all required primary-side rectification, filtering and transient protection circuitry), both in VIA packages and suitable secondary-side storage capacitance. Alternatively, a designer can combine a PFM front-end module with rectification, filtering and secondary-side output capacitance that is optimised for a specific application.
Whereas many alternative front-end systems are configured with capacitive energy storage at the high-voltage input, the PFM offers enhanced system safety by storing energy in low-voltage capacitors at the isolated SELV output. At one-fifth the thickness of traditional 1U front-end solutions, the mechanically robust, thermally adept VIA package simplifies mounting to an equipment side panel, chassis or other external heatsinking device, and provides improved thermal performance in any application. Moving the AC-DC conversion function to a chassis or side panel can reduce system size and cost, or free up valuable system real estate for other uses, and can provide improved thermal performance while eliminating the need for, and cost of, external heatsinks.
The new modules are compatible with a wide variety of available downstream power conversion components. By using Vicor’s online suite of PowerBench design tools to combine PFM AC-DC front-end modules with downstream modules selected from Vicor’s portfolio of high-density, high-efficiency, modular power converters, power architects can rapidly design and deploy complete off-line power systems.
For more information contact ECS, +27 (0)12 345 6132, [email protected], www.ecssa.co.za
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