Mumbai University Electronics (Semester -VII) 1 |www.brainheaters.in Solution for Power Electronics 2 December 2015 Index Q.1) a) …………………………………………………………………………. N.A b) …………………………………………………………………………. 2 c) …………………………………………………………………………. 2-3 d) …………………………………………………………………………. 4 e)………………………………………………………………………….. 4 Q.2) a) …………………………………………………………………………. 5 b) …………………………………………………………………………. N.A Q.3) a) …………………………………………………………………………. 6-7 b) …………………………………………………………………………. N.A Q.4) a) …………………………………………………………………………. N.A b) …………………………………………………………………………. 7-10 c) ………………………………………………………………………….. 10-12 Q.5) a) ………………………………………………………………………….12-15 b) …………………………………………………………………………. 15-19 Q.6) a) …………………………………………………………………………. 19-20 b) ………………………………………………………………………….20-22 c) …………………………………………………………………………. 22-23
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Mumbai University Electronics (Semester -VII)
1 |www.brainheaters.in
Solution for Power Electronics 2
December 2015
Index
Q.1)
a) …………………………………………………………………………. N.A
b) …………………………………………………………………………. 2
c) …………………………………………………………………………. 2-3
d) …………………………………………………………………………. 4
e)………………………………………………………………………….. 4
Q.2)
a) …………………………………………………………………………. 5
b) …………………………………………………………………………. N.A
Q.3)
a) …………………………………………………………………………. 6-7
b) …………………………………………………………………………. N.A
Q.4)
a) …………………………………………………………………………. N.A
b) …………………………………………………………………………. 7-10
c) ………………………………………………………………………….. 10-12
Q.5)
a) ………………………………………………………………………….12-15
b) …………………………………………………………………………. 15-19
Q.6)
a) …………………………………………………………………………. 19-20
b) ………………………………………………………………………….20-22
c) …………………………………………………………………………. 22-23
Mumbai University Electronics (Semester -VII)
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Q1)
(a) What are the advantages of SVM over the conventional sine wave PWM?
Explain .
ANs : N.A
(b) List the merits and demerits of online and offline UPS.
Ans:
(c) Explain regenerative braking for DC motors.
Ans:
Mumbai University Electronics (Semester -VII)
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Mumbai University Electronics (Semester -VII)
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(d) Explain in brief the effect of source inductance in single phase fully
controlled bridge rectifier.
Ans:
(e) Explain the concept of UPS and give classification of UPS system.
Ans:
Types of UPS:
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Q2)
(a) Explain clearly the steps involved in space Vector Modulation for
three phase voltage source inverse
Ans:
Switching states for SVM controlled 3 ɸ VSI
(b) A single phase full-wave mid-point converter with free wheeling
diode as shown below in Fig Q2 (b) is supplied from a 120V,50 Hz
supply with a source inductance of 0.33 mHenry .Assuming that the
load current is continuous at 4V .find the overlap angle for.
i) Transfer of current from a conducting thyristor to the commutating
diode.
ii) From the commutating diode to a thyristor when the fring angle is
15 degree.
Ans: N.A
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Q3)
(a) Derive and explain the state-space model of Buck converter.
Ans:
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(b) Explain the PI(Proportional +Integral) control of DC-DC converter