Switched capacitor intermediate bus converter delivers high power density for 48 V data centre applications

Flex Power Modules introduces the BMR310, a non-isolated switched capacitor intermediate bus converter (IBC) which provides high power density for data centres, thus improving board space utilisation and freeing space for other components.

Built on the proprietary Zero voltage switching Switched capacitor Converter (ZSC) technology of Infineon Technologies AG, the BMR310 achieves efficiency of over 98% at half load and can deliver power up to 875 W continuous in a compact package. It operates over an input voltage range of 40 V to 60 V, and delivers an unregulated output voltage of 10 V to 15 V.

For data centres and high-performance computing (HPC) applications, there is a growing trend to move away from 12 V and adopt 48 V power distribution to reduce distribution currents and power losses. To meet this increasing demand, the Infineon ZSC delivers the highest efficiency and power density for applications using 48 V to generate an intermediate bus voltage. This is achieved through capacitive energy transfer with soft switching of the power MOSFETs, and therefore enables an easy and low-risk migration path for legacy 12 V systems to a 48 V infrastructure at significantly reduced total cost of ownership (TCO).

Mikael Appelberg

“Infineon’s ZSC topology is a meaningful change in power distribution and enables us to deliver the high efficiency and power density that’s needed for data centres, today and tomorrow,” says, Mikael Appelberg as chief technology officer at Flex Power Modules.

“By fostering collaboration within the industry and utilising our application knowledge, we optimise our devices with the system in mind,” says, Richard Kuncic, senior vice president & general manager DC/DC at Infineon’s Power & Sensor Systems Division. “We are proud to see that our partners are able to engineer groundbreaking solutions with our technology.”

The BMR310 is mounted horizontally with a height profile of 10.3 mm, making it suitable for systems with limited space due to large heatsinks or cold plates. It measures 58.4 mm x 25.0 mm x 10.3 mm (2.3 x 0.98 x 0.41 in 3). The current mounting option is base-plated but an open frame will be available with future models.

To maximise operating lifespan, the BMR310 includes over-voltage, under-voltage, over-current and over-temperature protection function. As with all Flex Power Modules’ DC/DC converters, it complies with IEC/EN/UL 62368-1 safety standards.

Richard Kuncic

Paralleling of converters is supported using passive droop load sharing, enabling multiple converters to be combined to deliver higher power if required. The BMR310 is compatible with the Flex Power Designer software tool, and the new converter includes a PMBus interface for digital control.

Availability

The BMR310 will be available in November 2021 with evaluation samples for OEM orders available now.

More information about 48 V power distribution can be found here.

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