Fixed-ratio, 16:1, DC/DC converter accepts “ultra-high” 700V input

Fixed-ratio, 16:1, DC/DC converter accepts “ultra-high” 700V input

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By eeNews Europe

The 700V K-of-1/16 BCM has a power level of 1.75 kW and a peak efficiency of 97%, with a power density of 700 W/in³. The device is available in the thermally optimised 4414 (111 x 36 x 9.3 mm) VIA package, with either a chassis-mount or board-mount option and 4.3 kV of galvanic isolation. The VIA package also provides integrated PMBus communication, EMI filtering, and voltage transient protection. These modules can be paralleled into higher power arrays. In addition, the BCM outputs can be connected in series for higher output voltages. With part number BCM4414xG0F4440yzz, the module will deliver 25V – 43.75V from an input between 400V – 700V with a maximum continuous current rating of 40A.


Vicor suggests applications such as power distribution systems, 3-phase front ends, and more specialised designs such as HV DC bus supplies to tethered unmanned vehicles. BCMs can also be used as isolated unregulated front ends, which can then feed a variety of Vicor’s ZVS (zero-voltage-switching) PoL buck and buck-boost regulators or PRMs and VTMs, in a factorized power architecture.


These higher voltage BCMs are available in either “T-Grade” (-40˚C to 100˚C) or “C-Grade” (-20˚C to 100˚C) temperature grades. A Mil-Grade rating (-55˚C to 100˚C) is scheduled for release by the end of 2017.




next page; bidirectional conversion for HV DC buses

Vicor adds; providing DC-DC conversion after AC rectification and PFC, the 700V BCM provides a small, efficient, power component for power system designers to develop very compact and cost-effective 3-phase systems with an SELV (safe extra-low voltage) output. The 400V – 700V input capable device addresses nominal 380VRMS and 400VRMS input AC-DC conversion needs, commonly found in industrial applications.


Remote unmanned vehicles benefit from high-voltage DC transmission and bidirectional capability; the 1:16 transformation ratio and bidirectional operation suits the UHV BCM for remote unmanned vehicles used in air, sea, or underground exploration. Bidirectional operation enables systems to step up then step down line voltage to take advantage of reduced I2R losses, which improves power distribution cable size, weight, and costs with significant system efficiency improvements. By using higher voltages for transmission, the tether cross sectional area and thus the weight can be reduced to allow for greater operating range of the UAV.



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