GaN power design opens up space for backup battery

September 19, 2018 //By Nick Flaherty
GaN power design opens up space for backup battery
Delta Electronics has shrunk the size of its latest data centre power supply unit (PSU) using a high-voltage (HV) GaN FETs from Transphorm to allow space for a backup battery.

Delta’s latest 80Plus Platinum 800 Watt PSU now offers a backup lithium-ion battery. Should a data centre lose power, the PSU’s battery will keep connected servers running for one minute—long enough to allow for a proper power down sequence. The use of GaN enabled Delta to reduce the power system size by around 25 percent, allowing for the battery to be included in the Common Redundant Power Supplies (CRPS) form factor.

The design comes from Delta’s deepening experience working with GaN power semiconductors in an effort to equip customers with high performing power solutions. The decision to use HV GaN devices depended partly on meeting new product reliability and power density objectives, but also had to be based on an existing design. Delta repurposed its existing PSU design, standard PFC continuous-conduction mode (CCM) boost converter using HV devices from Transphorm.

Research firm Yole Développement projects the market’s growth to reach approximately $50 million by 2022. This would position server power supplies as the third largest segment within the total GaN power device market (~$450 million by 2022) behind broad industrial power supplies.

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