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Power Factor - Power Electronics - Past Exam Paper, Exams of Power Electronics

Alliance UniversityPower Electronics

Main points of this past exam paper are: Power Factor, Total Harmonic Distortion, Distortion Factor, Total Harmonic Distortion, Capacitive Filter, Half Wave Bridge Rectifier, Buck Regulator, Backup Power Supply, Peak Diode Current, Source Current

Typology: Exams

2012/2013

Uploaded on 03/27/2013

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Semester I Examinations 2007 / 2008
Exam Code(s) 4BN
Exam(s) B.E. Degree (Electronic Engineering)
Module Code(s) EE411
Module(s) Power Electronics
Paper No. I
External Examiner(s) Professor P. Cheung
Internal Examiner(s) Professor G. Ó Laighin
Professor W.G. Hurley
Instructions:
Answer 3 questions from 4. All questions will be marked
equally (20 marks).
Duration
2 hrs
No. of Pages 3
Department(s) Electronic Engineering
Requirements None
pf3

Partial preview of the text

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Semester I Examinations 2007 / 2008

Exam Code(s) 4BN

Exam(s) B.E. Degree (Electronic Engineering)

Module Code(s) EE

Module(s) Power Electronics

Paper No. I

External Examiner(s) Professor P. Cheung

Internal Examiner(s) Professor G. Ó Laighin

Professor W.G. Hurley

Instructions: Answer 3 questions from 4. All questions will be marked

equally (20 marks).

Duration 2 hrs

No. of Pages 3

Department(s) Electronic Engineering

Requirements None

1 Establish the relationship between Distortion Factor and Total Harmonic Distortion (THD). [4 marks]

Figure 1 shows a half wave bridge rectifier with a capacitive filter. Calculate

(a) the peak diode current; [6 marks]

(b) the RMS value of the source current, [3 marks]

(c) the power factor of the source, [4 marks]

(d) the total harmonic distortion (THD) of the source. [3 marks]

340SIN 314t

D

10,000μF (^20) Ω

Figure 1

2 Draw the circuit for a PWM Boost regulator, and explain its operation. [8 marks]

A boost regulator has an input voltage of 10 V and an output voltage of 100 V, at a switching frequency of 10 kHz. Calculate

(a) the value of the inductance in the circuit to give a current ripple of 0.5 A when operating at 300 W output, [4 marks] (b) the value of the output filter capacitance for a voltage ripple of 0.25 V, for the regulator in (a), [4 marks] (c) calculate the minimum value of inductance to ensure continuous conduction. [4 marks]

3 What are the principle advantages of a resonant topology over a switching PWM topology in dc-dc converters [4 marks]

Figure 2

Figure 2 shows a zero-current switching, quasi-resonant converter (ZCS-QRC) (a) Explain in detail, the four distinct modes of operation of the circuit. [8 marks] (b) Sketch the resonant inductor current and the resonant capacitor voltage over a full cycle [4 marks] (c) Derive an expression for the current in the resonant inductor [4 marks]