Question

A single-phase full-bridge inverter supplies a load of 10 W in series with an inductance of 31.8 mH. The inverter is supplied by a 380 VDC source.

(a) Sketch the inverter circuit as described above.

(b) Calculate the rms value of the fundamental (n = 1) of the
inverter output voltage assuming it is a square-wave.

(c) Assuming a quasi square-wave output voltage waveform with a
delay angle of 45°, calculate the rms value of the fundamental and
the two lowest order harmonics of the inverter output
voltage.

(d) Explain how the 7th harmonic of the inverter output voltage can
be eliminated while maintaining the same rms value of the
fundamental as obtained from (c). Then, plot the frequency spectrum
of the inverter output voltage up to the 11th order (consider
magnitude only). Label the important parameters clearly.

(e) Suggest and then describe a switching strategy for the inverter
power devices that can shift the lower order harmonics in the
inverter output voltage to the higher order side. Provide diagrams
if necessary to support your suggestion.

Answer #1

A 50 Hz single –phase inverter of 80% quasi –square waveform
output voltage
supplies a 40 mH with 8 ohm from a 200 V dc source. Plot the
relevant
waveform and find:
1- The rms voltage of the load and its components.
2- The expression of load current variation.

A single-phase full-bridge inverter has RLC load of R = 4 ? and
L = 35 mH
and C = 155 ?F. The dc input voltage is 230 V and the output
frequency is 50 Hz.
(a) Find an expression for load current up to fifth harmonic.
(b)Calculate rms value of fundamental load current
(c) The power absorbed by load and the fundamental power
(d)The rms and peak current of each IGBT
(e) Conduction time of IGBTs and diodes if...

A single?phase half?bridge inverter is used to power a purely
inductive load of 100mH. The inverter is supplied from a dc source
of 300V, and is operated at a frequency of 50Hz using square?wave
modulation.
a) Determine the values of the fundamental, 3rd, 5th and 7th
harmonic load current components.
b) Determine the load current THD value.

Draw the circuit for a three-phase full-bridge non-isolated
inverter. Describe how the converter works using switching
waveforms. Include a description of two different control
strategies using PWM and square-wave phase difference methods.
Clearly define the amplitude and frequency modulation indexes in
the PWM method. Discuss and calculate the rms phase and line
voltages when the DC input voltage is 400V.

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