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Finalgirlsspring 19

1. The document contains questions related to DC-DC converters, inverters, and rectifiers. Formulas for different types of DC-DC converters like buck, boost, and buck-boost are provided. 2. Question 1 asks to identify the type of DC-DC converter for different operating conditions. Question 2 is about designing a buck-boost converter. 3. Question 3 asks to design a single phase full bridge inverter and specify the modulation index and minimum switching frequency. 4. Question 4 is about calculating various power quality parameters like displacement power factor, distortion current, and total current for a single phase diode bridge rectifier circuit. 5. Question 5 asks to draw the line

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Khadija Alsayed
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27 views7 pages

Finalgirlsspring 19

1. The document contains questions related to DC-DC converters, inverters, and rectifiers. Formulas for different types of DC-DC converters like buck, boost, and buck-boost are provided. 2. Question 1 asks to identify the type of DC-DC converter for different operating conditions. Question 2 is about designing a buck-boost converter. 3. Question 3 asks to design a single phase full bridge inverter and specify the modulation index and minimum switching frequency. 4. Question 4 is about calculating various power quality parameters like displacement power factor, distortion current, and total current for a single phase diode bridge rectifier circuit. 5. Question 5 asks to draw the line

Uploaded by

Khadija Alsayed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Q1

Specify the type (buck, boost ,buck boost) for below Dc Dc converter

DC – DC working in CCM Converter type


Vs = 24 V , D = 0.6 , Vo = 60 V
Vs = 24 V , D = 0.6 , Vo = 12 V
Vs = 24 V , D = 0.5 , Vo = 12 V
D = 0.5 , Vo = 20 V , Po = 40
watt ,f=50khz, Lmin= 5 µH

D = 0.5 , Vo = 20 V , Po = 20
watt ,f=50khz, Lmin= 5 µH

Q2
Design a buck boost converter to produce on output voltage of 16V across a
load with a power 25.6 what the output voltage ripple must not exceed 1%
the DC input voltage is 24 V the switching F is 40KHz

A) The duty ratio


B) Find the size of inductor so that the maximum inductor current (
I max=10 A )
C) The size of capacitor
D) Assume L=100 μH and switching frequency is variable
1- Find minimum switching frequency below which the converter
will enter DCM
2- Using the frequency found in (D.1) what will be the minimum
power to make I max=10 A
Q3
Design a single-phase full bridge inverter that has a bipolar PWM output
across an RL series load with R = 10 ohm and L = 20mH fed by 380V DC
power supply. The fundamental frequency of output voltage must be 240V
rms at 50Hz and the total harmonic distortion of the load current must be
less than 8% specify the amplitude modulation ration (ma) and minimum
switching frequency (carrier frequency)
Q.4
In a single-phase diode bridge rectifier circuit fed by a source voltage of
240V (rms) drawing a current with a 50% THD and fundamental of 10A
(rms) the power drawn is 2KW calculate.
a) The DPF
b) The distortion current I distortion
c) The total current I s
d) The PF

Q.5
Draw the line to line voltage for a six-pulse inverter with switching shown
below
Formula for DC-DC converters
buck
V o =V s D

( Vs−Vo ) D
∆ i L=
Lf
V L=V s−V 0

V0
I L =I L =
R
V 0 IS
PS =P0 → =
V S I0
∆ iL 1 1−D
I L ,min =I L − =V 0 [ − ]
2 R 2 LF
∆ iL 1 1−D
I L ,max =I L + =V 0 [ + ]
2 R 2 LF
Vo (1−D)
Lmin =
∆ iLf
I C =I L −I R

1−D
C=
2 ∆ Vo
8( f ) L
Vo

Boost
Vs
V o=
1−D

VsD
∆ i L=
Lf
V L=V s
VS
I L=
¿¿
V 02
P0 = → V S I S=V S I L
R
∆ iL
I L ,min =I L − =¿
2
∆ iL
I L ,max =I L + =¿
2
Lmin =D ¿ ¿

−V 0
I C=
R
D
C=
∆ Vo
Rf
Vo

Buck-boost

D
V o =−V s [ ]
1−D

VsD
∆ i L=
Lf
V L=Vs

Is VsD
I L= =
D ¿¿

V 02 V 02
P 0= → I S=
R VS R
∆ iL
I L ,min =I L − =¿
2
∆ iL
I L ,max =I L + =¿
2
Lmin =¿ ¿
−V 0
I D=
R
D
C=
∆ Vo
Rf
Vo

DCM Buck
V o =V s
[ D
D+ D1 ]

D 1=
−D+ D2−
√ 2
8 Lf
R

V 0D1
I max=∆ i L =
fL
V0 1
I L =I R = = I (D+ D 1)
R 2 max

Rectifier (AC-DC)

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