Flex, Infineon team for 48V switched capacitor intermediate bus converter

Flex, Infineon team for 48V switched capacitor intermediate bus converter

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By Nick Flaherty

Flex Power Modules has developed a non-isolated switched capacitor intermediate bus converter (IBC) for data centre designs based on switch capacitor technology from Infineon

The BMR310 IBC uses proprietary Zero voltage switching Switched capacitor Converter (ZSC) technology from Infineon to achieve efficiency of over 98 percent 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 centre and high-performance computing (HPC) designs are moving from 12V to 48V power distribution to reduce distribution currents and power losses. This is requiring a new generation of components with significantly higher efficiencies for the higher currents of AI accelerators in particular.

ZSC uses capacitive energy transfer with soft switching of the power MOSFETs to provide 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).

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“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,” said Mikael Appelberg as Chief Technology Officer at Flex Power Modules.

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 maximize 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.

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.

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

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