Non-Isolated, Bidirectional Bus Converters (NBMs) – A New Class of Power Components

October 20, 2015
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non-isolated bus converter modules NBMsToday we announced a new family of non-isolated, fixed conversion ratio, bidirectional bus converter modules (NBMs). Utilizing Vicor’s Converter housed in Package™ (ChiP) packaging technology, and exploiting technical improvements in magnetic and semiconductor technologies, these NBM™ modules feature up to 98.3% operating efficiency and market-leading power density of up to 3,532 W/in3.

The new NBMs are initially available in two conversion factors:

  • A K=1/3 unit with secondary-side voltage that is one-third of its primary-side voltage and that can deliver up to 2,400 Watts of power when operating with a primary voltage in the range of 36 to 46 Volts
  • A K=1/5 unit with secondary-side voltage that is one-fifth of its primary-side voltage and that can deliver up to 2,000 Watts of power when operating with a primary voltage in the range of 36 to 60 Volts.

True bidirectional power transfer capability allows these units to be started up and controlled by applying voltage to either the primary or the secondary side. This capability can, for example, enable more efficient transmission of power from low voltage sources to remote low voltage loads by means of a higher voltage intermediate bus, with NBMs providing the voltage step-up and step-down functions at each end. Potential applications include Telecom and Datacom systems employing batteries and battery chargers; Power over Ethernet (PoE) systems; and emerging automotive applications, such as those envisioned by the proposed LV148 hybrid vehicle standard.

Initially available in a 6123 (61 x 23 mm) ChiP through-hole package, these devices are ideal for space constrained board-mounted applications where galvanic isolation is managed at the system level. Configuration options include Analog or PMBus control interfaces and commercial or military temperature operating ranges.

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