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A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is

1. 234
2. 245
3. 300
4. 331

Correct answer: 245

Solution

For a single-phase full-bridge inverter with 120° conduction, the fundamental rms output voltage is obtained from the Fourier series of the output waveform. Substituting the DC input of 300 V gives a fundamental rms value close to 245 V.

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