Switched Capacitor Intermediate Bus Converter for 48 V Data Center Applications

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The BMR310 from Flex Power Modules is built on the proprietary Zero voltage switching Switched-capacitor Converter (ZSC) technology of Infineon Technologies, and achieves efficiency of over 98 % at half load and can deliver power up to 860 W continuous in a compact package. It operates over an input voltage range from 40 to 60 V, and delivers an unregulated output voltage from 10 to 15 V.

For data centers 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).

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 centers, today and tomorrow,” said Mikael Appelberg, Chief Technology Officer at Flex Power Modules.

“By fostering collaboration within the industry and utilizing our application knowledge, we optimize our devices with the system in mind,” said Richard Kuncic, Vice President & General Manager 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 x 25.0 x 10.3 mm (2.30 x 0.98 x 0.41 inch). The current mounting option is baseplated 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.

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