Discussion
Which of the following devices CANNOT be used as the switching device in voltage source inverters?
Answer: D
A voltage source inverter needs switches that can be turned on and off under control: SCRs with forced commutation circuits, GTOs, power transistors, MOSFETs and IGBTs can all serve as the switching device.
A DIAC is a bidirectional trigger diode with no gate terminal; it breaks over at a fixed voltage and is used to trigger a TRIAC, so it cannot be controlled as a switching device in an inverter. The answer is DIAC, option D.
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