Question

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 only fundamental
component is considered.

Answer #1

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...

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.

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 full-wave rectifier has a 120 V rms, 60 Hz ac source. The load
is a series inductance, resistance and dc voltage source, with L =
100 mH, R = 10 Ω, and Vdc = 50 V.
a). Determine an expression for load current.
b). Determine the power absorbed by the dc voltage source.
c). Determine the power absorbed by the resistance.
d). Determine the power factor of the source.

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.

1. Design a full-wave bridge rectifier power supply to deliver
an average voltage of 9V with a peak-to-peak riple of 2V to a load.
The average load current is 100 mA. Assume that ideal diodes and
60-Hz ac volatage sources of any amplitudes needed are avaialable.
Draw the circuit diagram for your design, Specify the values of all
components used.
2. Repeat Problem 1 with 2 diodes and out-of-phase voltage
sources to form a full-wave rectifier.

A three-phase, 60-Hz, 4-pole, 440-V (line-line, rms)
induction-motor drive has a full-load
(rated) speed of 1746 rpm. The rated torque is 40 Nm. Keeping the
air gap flux-density
peak constant at its rated value.
The frequency and voltage of the motor from above are adjusted
such that the fan speed is changed to 600 rpm. The motor should be
operating at 3% slip and rated Bm. What is the motor
efficiency?

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