2kW bidirectional power reference design makes UPS 93% more efficient

Texas Instruments (TI) claims to offer the industry’s first 2kW isolated, bi-directional DC/DC converter reference design for 48 to 400V uninterruptable power supplies (UPS) and energy storage systems.

The reference design features TI analogue and embedded technologies, to achieve greater than 93 per cent efficiency in next-generation UPS, energy storage, power banks and battery charger applications. 

The isolated bidirectional DC/DC converter reference design empowers designers to increase efficiency over a wide load range for charger and back-up converter operations, while reducing system power consumption.

It is, says TI, the industry’s first design to provide support for energy storage supplies with a range of input voltages. The tested design helps designers meet Energy Star guidelines and quicken time to market.

Zero voltage switching (ZVS) in boost mode help enable higher efficiency and lower electromagnetic interference (EMI) than traditional hard-switching converters, while the wide low-voltage DC bus range is designed to charge a range of batteries. The design gives engineers flexibility to design with lithium ion (Li-ion), lithium polymer (Li-poly) and lead-acid battery banks ranging from 36 to 60V.

The mode changeover is seamless, says TI, at less than 100-micro seconds from charging to back-up mode. This helps reduce high-voltage hold up capacitor requirements.

For applications with wide-range voltage needs such as electric vehicles (EVs) or industrial servers, the integration of a back-up converter and charger into a single power stage, coupled with compact space requirements, allow developers to implement the transfer of energy to designs. The reference design includes TI’s analogue technology, including the 100V NexFET CSD19536KCS power MOSFET and half-bridge UCC27211A gate driver, for achieving high efficiency. The INA240 current sense amplifier provides accurate current measurements, while 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. The Piccolo TMS320F28033 microcontroller implements system control digitally.



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