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Resonance in RLC Circuit

The full brid...

Question

The full bridge inverter is used to produce a 60-Hz voltage across a series RL load using bipolar PWM. The dc input is 100 V, amplitude modulation ratio $m_{a}$ is 0.8 and the frequency modulation ratio $m_{f}$ is 21. What is the amplitude of the 60 Hz component of the output voltage?

A

80 V

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B

$1680 \sqrt{2} V$

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C

1680 V

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D

80 \sqrt{2} V

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Solution

The correct option is A 80 V
Amplitude of the 60 Hz fundamental frequency component of the output voltage is
$V_{1} = m_{a} V_{d c} = 0.8 \times 100 = 80 V$

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