HWSDC/DC Converters
Due date 5/31/2913
1) A boost converter has the following parameters:
Va. x 5 V V0, 2 20 V, and PM m 40 W
The minirmun value of the inductor current must be at least 80% of the average inductor
cunent. The output voltage ripple must be
HW1-3Phase System
1. The system shown below is balanced. Assume that: ZL= j10 and ZC= -j10. Find Ia, Icap ,
and load complex power.
2. Given the balanced three-phase system shown in below figure, calculate:
a. v1(t) and i2(t)
b. Power factor of the source
Home Work #2
1. A diode whose internal resistance is 2 is to supply power to a 100 load from a
230V (rms) source of supply. Calculate:
a) The peak load current.
b) The dc load current.
c) The dc diode voltage.
d) The percentage regulation from no load to
HW3-Fullwave Rectifier
1) A single-phase rectifier has a resistive load of 20 . Determine the average current and peak reverse
voltage across each of the diodes for
(a) a bridge rectifier with an ac source of 120 V rms, 60 Hz, and
(b) a center-tapped tran
introduction to Power Electronics-Midterm
Name: Rm Student 30:
Problem 1: in the battery charger circuit shown
below, battery is being charged by a 120V, 60Hz
source through a 100 resistor. if E=40V and g; x 3:
3) Plot V0, 10, 01 and V91
b) PIV and averag
Introduction to Power Electronics-Midterm
Narne: Student ID:
V5;
Problem 1: In the heater circuit shown below, R=100
Vm=100V, f=50Hz, and T is fired at a=90.
b) Calculate source power factor 5 E
c) ifT has a V7=0.5V and RT=O.01(1, calculate
power dissipat
Introduction to Power Electronics - Lab 3
Lab 3 : FULL-WAVE RECTIFERS (Single and Three-Phase)
I.
Resistive Load (Single-Phase): See Figure 4.1 of the textbook
Pre-lab: Simulate the circuit in Figure1:
Note Use ideal diodes (forward voltage = 0 v).
1. Pl
Introduction to Power Electronics - Lab 2
Lab 2 : HALF-WAVE RECTIFERS
I.
Resistive Load:
Pre-lab: Simulate the circuit in Figure1:
Note: Add a new plot for each step and keep it. If you modify a circuit, the result will be
reflected to all the plots afte
Introduction to Power Electronics Lab 1
Part (a) Single-Phase Power Factor Correction
(Due next week in lab)
1. Draw the schematic depicted in figure 1.
E1 = 150Vrms ; f = 60Hz ; R1 = 10 ; L1 = 35mH ;
Figure 1
2. Plot current and voltage of R1; Repeat for
HWZ-Halfwave Diode Rectifier
1) For a half~wave rectier with resistive load with V,n:1005in(400t) V and R310 0 determine
a) the average load current
b) the rms load current
c) the apparent power supplied by the source
d) the power factor of the rectier
e)
HW6-Isolated DC/DC Converters
Due date 06/5/2013
1) Choose transformer turns ratios N1/N2 and N1/N3 and the duty ratio of a forward converter if Vin = 90 V,
Vo=145 V and the maximum allowed voltage of the switch is 280 V. Draw the voltage drop of D3 (the
HW5-DC/DC Converters
Due date 5/31/2013
1) A boost converter has the following parameters:
Vin = 5 V, Vout = 20 V, and Pout = 40 W
The minimum value of the inductor current must be at least 80% of the average inductor
current.
85 kHz.
The output voltage r
HW4-Buck-Boost Converters
Due date 5/24/2013 11:59 am
1) A buck converter has an input voltage of 48 V, a duty ratio of 0.25, and a load
resistance of 36 . Find the output power if the converter is operating in CCM?
2) Design a buck converter (L = ? C = ?
HW2-Halfwave Diode Rectifier
1) For a half-wave rectifier with resistive load with vin=100sin(400t) V and R=10 determine
a) the average load current
b) the rms load current
c) the apparent power supplied by the source
d) the power factor of the rectifier
Homework 5
1. Flyback converter
a)
b)
c)
d)
Vin = 300 V, Vo = 6 V, D = 0.4, Io = 30 A, fs = 100 kHz,
Calculate N1/N2.
ILm is set equal to 0.2 A, calculate Lm.
Calculate maximum current in the switch and sketch the waveform.
Find Vsw during Toff
2. Forward
Homework # 5
Problem 4
4. A push-pull converter has the following parameters: Vs = 50 V, Np/Ns = 2, Lx = 60 H, C = 39
F, R = 8 , f = 150 kHz, and D = 0.35. Determine:
a) The output voltage,
b) the maximum and minimum inductor currents,
c) the output volta
Homework #3
1. A single phase diode rectifier has mean output voltage of 200V and the load resistance is 400
. Determine the inductance required to limit the amplitude of second-harmonic current in the
load to 0.06A. (f=60Hz, Hint:
)
2. During forward con
Homework #4
1. A buck convertor has Vin=22 to 32 V, Vo=14V, Io=0.2 to 2 A, and f=40 kHz:
a) Find the minimum inductance L required to maintain convertor operation in the CCM.
b) Find the transistor's and diode's maximum voltage and current.
2. In a Boost
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Introduction to Power Electronics - Homework 1
Homework 1 - Three-Phase System
Due Monday, 1/27/2014
Question 1: A 208-V three-phase balanced power system, shown below, consists of an ideal
208-V Y-connected three-phase generator connected through a three
Introduction to Power Electronics - Homework 1_Hints
Hints for Homework 1
Y connection:
IL = I
connection:
IL =
VL =
I
V
VL = V
_
P = 3 V I cos
P=3
|Z| cos
P=
VL IL cos
Q = 3 V I sin
Q=3
|Z| sin
Q=
VL IL sin
|S| = 3 V I
|S| = 3
|Z|
|S|=
VL IL
All