High-frequency inverters generally use Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs). These semiconductor switches open and close rapidly at high frequencies to convert the voltage into a high-frequency AC waveform. The simplest form of an inverter is the bridge-type, where a power bridge is controlled according to the sinusoidal pulse-width. . We have seen that we can use harmonic elimination to eliminate low-frequency harmonic content at the expense of high switching frequency (with resulting undesired content at high frequency where it is easily fltered. If we can add waveforms, we can also realize harmonic cancellation which cancels. . The low frequency inverters typically operate at ~60 Hz frequency.
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