Switched Capacitor Intermediate Bus Converter With High Power Density

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Provides an efficiency of over 98% and is suitable for systems with limited space due to large heatsinks or cold plates

For data centres requiring high power density, here’s presenting the BMR310, a non-isolated switched capacitor intermediate bus converter (IBC) by Flex Power Modules. By using this, free space for other components increases thus providing optimal board space utilisation. Mounted horizontally with a height profile of 10.3 mm, the BMR310 is suitable for systems with limited space due to large heatsinks or cold plates.

Built on the Zero voltage switching Switched capacitor Converter (ZSC) technology of Infineon Technologies AG, the BMR310 has an 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.

Data centres and high-performance computing (HPC) applications seem to be adopting 48 V power distribution instead of 12 V to reduce distribution currents and power losses. To meet this, the Infineon ZSC delivers high 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, therefore enabling legacy 12 V systems to easily migrate to a 48 V infrastructure with low-risk and reduced total cost of ownership (TCO).

To maximise operating lifespan, the BMR310 includes over-voltage, under-voltage, over-current and over-temperature protection functions. 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 also compatible with the Flex Power Designer software tool, and the new converter includes a PMBus interface for digital control.

“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,” said 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,” said Richard Kuncic, 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 complies with IEC/EN/UL 62368-1 and will be available in November 2021. Evaluation samples for OEM orders are available now in a 58.4 mm x 25 mm x 10.3 mm (2.3 x 0.98 x 0.41 in) package. The current mounting option is baseplated but an open frame will be available with future models.


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