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In an SMPS, operating at 20 to 100 KHz, what is the main switching element?

In an SMPS, operating at 20 to 100 KHz, what is the main switching element? Correct Answer MOSFET

  • The ‘Switched Mode Power Supply’ owes its name to the dc-to-dc switching converter for conversion from unregulated dc input voltage to regulated dc output voltage
  • The switch employed is turned ‘ON’ and ‘OFF’ (referred as switching) at a high frequency
  • A high switching frequency (of the order of 100 kHz) and a fast control over the duty ratio results in application of the desired mean voltage along with ripple voltage of a very high frequency to the output side
  • MOSFETs are preferred in those applications with high-frequency operation
  • MOSFET applications include switch-mode power supplies using hard switching

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