2kW bidirectional power reference design for more efficient UPS

2kW bidirectional power reference design for more efficient UPS

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By Nick Flaherty

The isolated bidirectional DC/DC converter reference design gives designers of electric vehicles and industrial servers increased efficiency over a wide load range for charger and backup converter operations, while reducing system power consumption.

The isolated bi-directional DC/DC converter reference design supports  48-V to 400-V range with over 93% efficiency from using DC-DC converters with zero voltage switching (ZVS) in boost mode which also lowers the electromagnetic interference (EMI).

The design can charge a wide range of batteries such as lithium ion (Li-ion), lithium polymer (Li-poly) and lead-acid battery banks ranging from 36 V to 60 V. A 100 micro-seconds (µS) switchover from charging to backup mode helps reduce high-voltage hold up capacitor requirements.

The reference design includes TI’s 100V NexFET CSD19536KCS power MOSFET and half-bridge UCC27211A gate driver alongside a INA240 current sense amplifier that provides accurate current measurements. The AMC1301 reinforced isolated amplifier and the UCC21520 isolated half-bridge gate driver provide an effective option for sensing the isolated high-voltage rail and driving the high-voltage full-bridge respectively. A Piccolo TMS320F28033 microcontroller provides the digital system control.

Details of the reference design are at

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