Reducing Size, Noise, and Field Failures of Transportation APUs скачать в хорошем качестве

Reducing Size, Noise, and Field Failures of Transportation APUs

Kevin Speer, Nitesh Satheesh, and Marc Rommerswinkel, Microchip: The needs to shrink the size and soften the sound of today’s transportation auxiliary power units (APUs) have met a roadblock: Silicon IGBTs are lossy and incapable of switching the required power at frequencies above the audible range. High-voltage SiC MOSFETs allow designers to extend switching frequency well above 20 kHz, arresting noise and dramatically reducing the size of transformers; moreover, heat sinks may be downsized thanks to diminished light-load conduction losses and slashed switching losses. This presentation reports a total SiC MOSFET solution unifying three key pieces: MOSFETs designed for rugged operation to reduce field failure; low inductance power package for optimal efficiency and heat sink miniaturization; and digital gate driver for intelligent protection, control, and ease of system optimization.