First 900V SiC MOSFETs qualified for automotive and outdoor use

August 01, 2018 //By Nick Flaherty
First 900V SiC MOSFETs qualified for automotive and outdoor use
Cree's Wolfspeed division has launched a family of robust silicon carbide (SiC) devices for the Electric Vehicle (EV) and renewable energy markets, targeting on-board automotive power conversion systems, off-board charging, solar inverters and other outdoor applications. 

Wolfspeed claims its E-Series family is the first commercial family of 900V SiC MOSFETs and diodes to be automotive AEC-Q101 qualified and PPAP capable.  The designation meets high-humidity and automotive qualifications to deliver reliability and corrosion-resistance requirements.

“The new E-Series family provides automotive manufacturers with robust, automotive-qualified MOSFETs and diodes for on-board and off-board charging circuits, which are crucial to the evolution of EV technology,” said Cengiz Balkas, senior vice president and general manager of Wolfspeed.  “The commercial rollout of the E-Series family establishes Wolfspeed as the first in the industry to launch a full suite of MOSFETs and diodes that are capable of withstanding high-humidity environments while offering the reliability and system-level value needed to drive widespread adoption of silicon carbide among automakers for their next generation of EVs.”

The E-Series SiC MOSFET uses Wolfspeed’s third generation rugged planar technology, which has more than 10 billion field hours.  Offering the industry’s lowest switching losses and highest figure of merit, the E-Series 900V MOSFET is optimized for use in EV battery chargers and high voltage DC-DC converters and is featured in Wolfspeed’s 6.6kW B-Directional On-Board Charger reference design.

The Merged-PIN Schottky Diodes (MPS) deliver high reliability for on-board power conversion systems and solar inverters, complementing Wolfspeed’s existing AEC-Q101 qualified 650V SiC diode portfolio. The diodes deliver a 1200V blocking capability with a current rating up to 20A at a TJ,Max = 175⁰C.  Reference designs include a 20kW Two-Level AFE and DC-DC Converter for Off-Board Chargers, which delivers more than 30 percent reduction in power loss when compared to existing three level Vienna Rectifiers.

The E-Series family also addresses solar power systems that need to withstand extremely harsh environmental conditions while maintaining peak performance.  As corrosion caused by humidity is a major consideration when designing outdoor power systems, the key qualification for harsh environments is the HV-H3TRB rating (also known as HVDC THB or THB80).  The HV-H3TRB qualification testing was performed at 80 percent

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