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3.11 Problems

3.1: A single-phase half-bridge voltage source inverter is supplied from a center-tapped dc input voltage 120 V. The inverter supplies a resistive load of 20 Ω. Calculate;

a. The fundamental output peak and rms voltage

b. First three harmonics of the output voltage

c. Power consumed by the load

3.2: A single-phase full-bridge voltage source inverter is supplied from a dc input voltage of 300 V. The inverter supplies a resistive load of 20 Ω. Calculate;

a. The fundamental output peak and rms voltage

b. First three harmonics of the output voltage

c. Power consumed by the load

3.3: A single-phase half bridge inverter is controlled using bipolar PWM method and supplied from a center tapped 120 V dc supply. The fundamental output voltage is of 50 Hz frequency. The triangular carrier signal's frequency is 5 kHz. For a modulation index of 0.9, determine;

a. Frequency modulation ratio

b. Fundamental output peak and rms voltage

c. First three significant harmonic order produced in the output voltage

3.4: A single-phase full-bridge voltage source is supplied by a dc source of 300 V and controlled using unipolar PWM technique. The modulation index is 0.9, the fundamental output frequency is 50 Hz and the carrier signal frequency is 2 kHz. Compute the following:

a. Fundamental output voltage peak value

b. First three dominant harmonic components

3.5: A three-phase voltage source inverter is operating in 180° conduction mode and supplied from a 600 V dc link voltage. ...

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