Power semiconductors

In a power device gate drive circuit, what is the effect of increasing the gate resistance?

  1. ASwitching slows down; surges and noise decrease but switching loss increases
  2. BSwitching speeds up, and both losses and noise decrease
  3. CIt has no effect on switching
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Answer: A. Switching slows down; surges and noise decrease but switching loss increases

A larger gate resistance slows the charging and discharging of the gate capacitance, making voltage and current transitions gentler. As a result, surge voltages and noise decrease, but transitions take longer, increasing switching loss. The gate resistance is chosen to balance loss against noise.

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More Power semiconductors questions

  1. Which metric indicates how long a power device can withstand a short circuit, such as both upper and lower switches of an inverter turning on at once, without being destroyed?
  2. What is the purpose of providing a short period in which both switches are off (dead time) when switching the upper and lower switches of an inverter?
  3. Which is a known cause of degradation when current flows continuously through the body diode of a SiC MOSFET?
  4. Which is an example of an everyday product in which GaN power devices are increasingly used?
  5. What is the main role of power semiconductors?