Power semiconductors

What is the main advantage of using SiC power devices in electric vehicle inverters?

  1. AThey are always cheaper than silicon
  2. BLower losses lead to longer driving range and smaller cooling systems
  3. CThe motor becomes unnecessary
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Answer: B. Lower losses lead to longer driving range and smaller cooling systems

SiC devices have low on-resistance and switching loss and operate well at high temperatures, so inverter losses decrease. As a result, the vehicle can travel farther on the same battery, and the cooling system and the inverter itself can be made smaller and lighter.

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More Power semiconductors questions

  1. In an ideal step-down chopper (buck converter) with an input voltage of 12 V and a switch duty cycle of 0.25, what is the output voltage?
  2. Which DC-DC converter outputs a DC voltage higher than its input?
  3. At IGBT turn-off, what is the phenomenon called in which the current does not drop to zero immediately but trails off because of stored minority carriers?
  4. Which is a known challenge of SiC MOSFETs?
  5. In SiC power modules operating at high temperatures, which material is sometimes used instead of solder to bond the chips?