Industrial Electronics

Bridgeless power supply unit exceeds 80 PLUS titanium standard

04 October 2021

A high efficiency, highest power density 3 kW bridgeless totem pole (BTP) power factor correction (PFC) plus LLC resonant converter power supply unit (PSU) that exceeds the 80 PLUS titanium standard has been introduced by GaN Systems. The combined gallium nitride (GaN) BTP-PFC with GaN LLC resonant converter enables designers to create lower-cost power supplies that meet demands to deliver more power in a smaller footprint and new energy efficiency requirements, including European Union’s Lot 9 2023.

GaN technology brings higher efficiency, higher power density, lower cost and increased sustainability to the data center ecosystem. GaN Systems concluded that significant energy and cost savings are achieved by switching from silicon-based PSUs to GaN-based PSUs. Since data centers vary in size, the savings are based on a 10-rack unit of measure. From a sustainability perspective, each set of 10 racks reduces carbon dioxide emissions by 100 metric tons per year, and financially, GaN-based PSUs increase data center profits by $3 million per year.

Source: GaN SystemsSource: GaN Systems

Most high-efficiency power supplies are designed with a bridgeless or semi bridgeless PFC stage and a resonant DC-DC stage such as an LLC resonant converter. GaN Systems’ 3 kW BTP-PFC and 3 kW LLC Converter deliver the best-in-class solution. Together, these designs achieve high power density above 80 W/in3 and reduce PSU total cost.

  • 3 kW BTP is the latest technology for a high-efficiency PFC. GaN Systems’ reference design offers less conduction loss and enables near 99% peak efficiency due to no body diode loss and the higher performance of GaN transistors. Additional benefits include using 40% fewer components and a 10% to 25% reduction in system cost.
  • The 3 kW LLC reference design offers higher frequency (greater than 200 kHz for higher power density) and higher efficiency at both light and full load. The 54 V output voltage can support 48 V power architectures for data centers. The design highlights a power density of 146 W/in3 (air-forced cooling) and greater than 98% peak efficiency, achieved with a resonant frequency at 250 KHz and at a maximum frequency at 400 KHz.
  • Both 3kW BTP PFC and LLC reference designs use the latest generation 650 V E-mode transistor, GS-065-030-2-L, the first GaN product on the market that enables designers to get the advantages of low-cost GaN in applications at the 3,000 W power level.
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