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Sinusoidal Pulse Width Modulation - II

A PWM with un...

Question

A PWM with unipolar switching scheme is used in an inverter with fundamental frequency = 47 Hz and $m_{f} = 38$ . Which of the following harmonic frequency is present in the output ?

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Solution

In unipolar switching,
harmonic order
$h = j (2 m_{f}) \pm k$

$h = j 76 \pm k$

$f_{H} = (j 76 \pm k) \times 47$
$j = 1, k = 1$
$\Rightarrow f_{H} = 3525 H z$

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