In most inverters, which component is used to increase the frequency of the incoming 50/60 Hz signal to the inverter’s operating frequency around 20 kHz?

In most inverters, which component is used to increase the frequency of the incoming 50/60 Hz signal to the inverter’s operating frequency around 20 kHz?

• A. IGBT
• B. SCR
• C. Diode
• D. Transformer

Answer: (A)

Inverters create a high-frequency switching signal that, after filtering, becomes the desired 50/60 Hz output. The component that makes those rapid on/off transitions is a high-speed switching transistor, typically an IGBT. It can switch efficiently at around 20 kHz and handle the needed voltage and current, allowing precise pulse-width modulation (PWM) control. Other options don’t fit this role: a silicon-controlled rectifier (SCR) latches on and is not easily turned off at high frequency, so it can’t support the required PWM; a diode conducts but cannot be switched on and off by the control signal to generate PWM; a transformer changes voltage or impedance but does not set or generate the high-frequency switching needed for PWM.

Inverters create a high-frequency switching signal that, after filtering, becomes the desired 50/60 Hz output. The component that makes those rapid on/off transitions is a high-speed switching transistor, typically an IGBT. It can switch efficiently at around 20 kHz and handle the needed voltage and current, allowing precise pulse-width modulation (PWM) control. Other options don’t fit this role: a silicon-controlled rectifier (SCR) latches on and is not easily turned off at high frequency, so it can’t support the required PWM; a diode conducts but cannot be switched on and off by the control signal to generate PWM; a transformer changes voltage or impedance but does not set or generate the high-frequency switching needed for PWM.