Transphorm Inc. confirmed that customer AES Aircraft Elektro/Elektronik System GmbH has released its first 650 V GaN-based power supplies. Serving the aviation industry, AES supports customers with various products and services ranging from electrical engineering to certification and testing. The company’s newest Switch Mode Power Supplies are currently used by large CS-25 airplane manufacturers (e.g., Airbus A318-A321, A330, A340, A380 and Boeing B767, B787 VIP aircraft) and use Transphorm’s GaN FETs to increase overall system efficiency by more than 10 percent compared to competitive Silicon-based power supply unites (PSUs).
The two GaN-based Switch Mode Power Supplies are the PS250X 500 W system and the PS6120 1200 W system. Both products support a 96-130 VAC/360 Hz – 800 Hz input voltage with a 28 VDC continuous power output at 15 amps for the 500 W system and 42 amps for the 1200 W system.
Further, AES certified the PS250X and PS6120 as DO-160 compliant—meeting the more than 25-point stringent Standard of the Radio Technical Commission for Aeronautics (RTCA). This Standard assesses system impact and performance under various external and internal conditions on aircraft—ranging from pressure and temperature to voltage spikes and RF emissions.
The flagship 500 W PS250X is the industry’s first passively cooled power supply at 420 W anddeploys Transphorm’s GaN in a single-phase CCM boost power factor correction (PFC) topology. It offers more than 92 percent overall system efficiency at full load, which is more than 10 percent greater than its competition. The system also yields a more than .98 power factor and 200 mVpp nominal at 115 VAC/400 Hz input at full load. All within an end product that is 1.4 kg (~3 lbs).
The 1200 W PS6120 deploys Transphorm’s GaN in a fan-cooled, three-phase CCM boost PFC topology. It offers more than 91.5 percent overall system efficiency at full load, which is 11.5 percent greater than its competition. The PS6120 also yields the same power factor and nominal ripple voltage at 115 VAC/400 Hz input at full load as the PS250X 500 W PSU. All within an end product that is 4.0 kg (~8.8 lbs).
The GaN Selection Process
Interested in the technology’s inherent higher switching frequency, AES reviewed GaN power switch converters from several GaN device semiconductor manufacturers. The company ultimately selected Transphorm’s 650 V GaN technology due primarily to its ease of drivability and designability—specifically because Transphorm’s GaN FETs do not require custom drivers. As a result, system design is simplified while engineers can drive the switches using technology they are already familiar with (i.e. drivers and packages). Other factors affecting AES’ selection included Transphorm’s proven reliability—which is underscored by its GaN platform earning both a JEDEC qualification and AEC-Q101 qualification at 175°C.
AES’ PS250X and PS6120 power supplies are currently shipping.