EE 484 Spring 2015 Homework 05 J. Heynssens
Homework is due, Mon Mar 2nd in class. After the first 5 minutes of class, no credit! 3 problems, 100 points total
Write your name, the assignment name, and the date at the top of the first page of each assignment. Staple multiple pages together. Remove straggly edges. Number all problems and put them in order in your assignment. Please write clearly and draw a box around numerical answers. You will not get credit if your work is difficult to follow or the answer in a box is not easily seen. You will not get full credit if these directions arent followed.
100 points total. Chapter 5 and 6 Problems from Book (Ned Mohan Power Electronics),
1. (18 points total) (Mohan 5.1) In a single-phase diode rectifier bridge, Is = 10Arms, Is1 = 8Arms, and DPF = 0.85, Calculate:
Idistortion
%THD
PF
(24 points total) (Mohan 5.2) in a single-phase diode bridge rectifier circuit, the following operating conditions are given: Vs=120Vrms, P=0.95kW, Is1=10A, and THD=75%. Calculate:
DPF
Idistortion
Is
PF
3. (30 points total) (Mohan 5.5) In the three-phase rectifier, if the input currents are
rectangular waveforms as shown below with an amplitude of 12 A, DPF=1.0, and Is1 = 9.36A. Calculate:
Is (Hint: use the definition of RMS, numerical answer 9.8A)
Is1
Idistortion
%THD
PF
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4. (28 points total) (Mohan 6.1) In a single-phase 60 Hz power factor correction circuit, Vs = 120Vrms, Vd = 250Vrms, and the output power is 300W. Calculate and draw the following waveforms synchronized to the vs waveform: (hint:? =
?2 , =12? ?)
a. ?( )
b. ( )
c. ?( )
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