Code No.
: 16MT12303 SET - 1
SREE VIDYANIKETHAN ENGINEERING COLLEGE
(An Autonomous Institution, Affiliated to JNTUA, Anantapur)
I M.Tech. I Semester PED (SVEC 16) Regular / Supplementary Examinations
ANALYSIS OF POWER CONVERTERS
(Power Electronics and Drives)
Time: 3 Hours Max. Marks: 70
Answer ONE question from each unit
All questions carry equal marks
UNIT – I
1. a) Explain with the help of waveforms the operation of a single phase semi 7M CO1
controlled Converter.
b) Evaluate the performance parameters of single phase semi controlled converter 7M CO3
with inductive load
OR
2. a) A single phase semi converter is operated from 120 V, 60 Hz supply. The load 6M CO3
current with an average value IDC is continuous and ripple free angle α = π/6.
Determine
i. Displacement Factor
ii. Harmonic factor of input current
iii. Input power factor
b) Analyze with the help of waveforms, the operation of a single phase fully 8M CO2
controlled Rectifier.
UNIT – II
3. a) A three phase semi converter is operated from a three phase star connected 208 V, 6M CO3
60 Hz supply and the load resistance is R = 10 Ω. If it is required to obtain an
average output voltage o 50 % of the maximum possible output voltage, calculate
(a) the delay angle α (b) the RMS and average output currents (c) the average and
RMS thyristors currents (d) the rectification efficiency (e) TUF (f) the input PF.
b) Derive the Fourier series for input power factor of a three phase full converter 8M CO4
OR
4. a) Evaluate the performance parameters of three phase fully controlled converter 6M CO3
with inductive load.
b) Explain with the help of waveforms the operation of a three phase fully controlled 8M CO1
Converter.
UNIT – III
5. a) Analyse and design the performance parameters of Buck-Boost Converter. 6M CO2
b) Design a converter and its parameters to maintain the stable DC output from a 8M CO5
flexible DC input and Explain it with neat waveforms.
OR
6. a) The buck regulator has a input voltage of Vs = 15 V. The required average output 6M CO3
voltage is Va = 5 V and peak to peak output ripple voltage is 10 mV. The
switching frequency is 20 kHz. If the peak to peak ripple current of inductor is
limited to 0.5 A determine (a) the duty cycle (b) the filter inductance (c) the filter
capacitance (d) the critical values of L and C.
b) Derive the performance parameters of class A chopper with neat waveforms. 8M CO2
UNIT – IV
7. a) Compare ZCS and ZVS resonant converters. 7M CO1
b) Explain the operation of half bridge converter with power circuit and waveforms. 7M CO1
OR
8. Analyze the step by step procedure for the design of zero-voltage switching 14M CO2
resonant converter.
UNIT – V
9. a) Analyze the principle of single phase control with neat waveforms. 7M CO2
b) An AC voltage Controller has a resistive load of R=10Ω and the RMS input 7M CO3
voltage is Va=120V, 60Hz. The thyristors switch is on for n=25 cycles and is off
for m=75 cycles. Determine (a) the RMS output voltage V0(t) and the input power
factor.
OR
10. a) Explain the operation of single phase Full wave AC voltage Controller with 7M CO1
Resistive load with neat waveforms.
b) Explain the operation of single phase Dual converter with RL load with neat 7M CO1
waveforms.
Code No.: 16MT12303 SET - 2
SREE VIDYANIKETHAN ENGINEERING COLLEGE
(An Autonomous Institution, Affiliated to JNTUA, Anantapur)
I M.Tech. I Semester (SVEC 16) Regular / Supplementary Examinations
ANALYSIS OF POWER CONVERTERS
(Power Electronics and Drives)
Time: 3 Hours Max. Marks: 70
Answer ONE question from each unit
All questions carry equal marks
UNIT – I
1. a) Derive an expression for average load voltage of single phase full converter with 7M CO1
RL load and freewheeling action.
b) The 3phase half wave rectifier is operated from a 3phase wye connected 220V, 7M CO3
60Hz supply and load resistance R=10Ω. If the average output voltage is 25% of
the maximum possible average output voltage, calculate (a) Delay angle, (b) RMS
and Average output currents.
OR
2. a) Discuss the inversion operation of single phase fully controlled rectifier with the 6M CO1
help of waveforms and power circuit.
b) Derive output voltage expression and Fourier series expression for single phase 8M CO2
semi controlled converter with RL load.
UNIT – II
3. a) Derive the performance parameters of three phase full converter with Resistive 6M CO3
load.
i. Maximum and average output voltage
ii. Average output and load RMS current
iii. Rectification efficiency
iv. TUF and Output power
b) Derive the Fourier series for input power factor of a three phase semi converter. 8M CO4
OR
4. a) Explain the operation of three phase semi controlled converter in continuous and 6M CO5
discontinuous mode by providing appropriate free-wheeling diodes.
b) Derive the relationship between overlap angle and delay angle for three phase full 8M CO2
converter with neat waveforms.
UNIT – III
5. a) Explain the operation of Class A chopper with neat waveforms. 6M CO1
b) The input voltage of a CUK converter Vs = 15 V. The duty cycle k = 0.4 and the 8M CO3
switching frequency is 25 KHz. The filter inductance is L2 = 220 µH and filter
capacitance is C2 = 220 µF. The energy transfer capacitance is C1 = 400 µF and
inductance is L1 = 250 µH. The average load current is 1.25 A. Determine (a) the
average output voltage (b) the average output current (c) the peak to peak output
current ripple of inductor L1 (d) the peak to peak output voltage ripple of capacitor
C1 (e) the peak to peak output current ripple of inductor L2 (f) the peak to peak
output voltage ripple of capacitor C2 (e) the peak current of transistor.
OR
6. a) Explain the operation of Class D chopper with neat waveforms. 6M CO1
b) Analyse and design the performance parameters of Boost Converter. 8M CO2
UNIT – IV
7. a) Explain the operation of half bridge converter with power circuit and waveforms. 7M CO1
b) What are the advantages and limitations of ZCS resonant converters? 7M CO2
OR
8. Discuss different modes of M-type ZCS Resonant converter with neat waveforms 14M CO1
and with equivalent circuits
UNIT – V
9. a) Analyze the operation of a converter to get the variable AC output voltage full 7M CO5
wave Ac voltage Controller with RL with neat waveforms.
b) Derive the performance parameters of single phase full wave controller with RL 7M CO2
load
i. RMS output voltage
ii. RMS output current
iii. Average input current and Input power factor
OR
10. a) Explain the operation of single phase Dual converter with RL load with neat 7M CO1
waveforms.
b) Compare Dual converter and AC Voltage Controller and mention their 7M CO2
applications.
Code No.: 16MT12303 SET - 3
SREE VIDYANIKETHAN ENGINEERING COLLEGE
(An Autonomous Institution, Affiliated to JNTUA, Anantapur)
I M.Tech. I Semester (SVEC 16) Regular / Supplementary Examinations
ANALYSIS OF POWER CONVERTERS
(Power Electronics and Drives)
Time: 3 Hours Max. Marks: 70
Answer ONE question from each unit
All questions carry equal marks
UNIT – I
1. a) Analyze the operation of a single phase fully controlled Rectifier with the help of 7M CO2
waveforms
b) Discuss the continuous and discontinuous modes of operation as a semi controlled 7M CO1
converter with RLE load.
OR
2. a) The single phase full converter has a RL load having L = 6.5 mH, R = 0.5 Ω and E 6M CO3
= 10 V. The input voltage is Vs = 120 V at (RMS) 60 Hz. Determine (a) The load
current ILO at wt = α = 600 (b) The average thyristors current (c) The RMS
thyristors current (d) RMS output current and average output current.
b) Derive an expression for output voltage of single phase fully controlled converter 8M CO2
with source inductance Ls and overlap angle is mu.
UNIT – II
3. a) Derive the performance parameters of three phase semi converter with Resistive 6M CO3
load.
i. Maximum and average output voltage
ii. Average output and load RMS current
iii. Rectification efficiency
iv. TUF and Output power
b) Illustrate the forced commutation techniques to improve the input power factor for 8M CO4
DC-AC converters.
OR
4. a) The three phase full converter has a load of L = 1.5 mH, R=2.5 Ω and E = 10 V. 6M CO3
The line to line input voltage is Vab = 208 V (rms), 60 Hz. The delay angle is α =
π/3. Determine (a) the steady state load current IL1 at wt’ = π/3 + α (or wt = π/6 +
α) (b) the average thyristors current IA and (c) the RMS thyristors current IA (d)
the RMS thyristors current IR (e) the average output current Idc
b) Derive the relationship between overlap angle and delay angle for three phase full 8M CO2
converter with neat waveforms.
UNIT – III
5. a) The buck - boost regulator has an input voltage of Vs = 12 V. The duty cycle k = 6M CO3
0.25 and the switching frequency is 25 kHz. If inductance = 150 µH and filter
capacitance = 220 µF. The average load current Ia = 1.25 A. Determine (a) the
average output voltage (b) the peak to peak output voltage ripple ΔVc (c) the peak
to peak output current ripple ΔI (d) the peak current of the transistor and (e) the
critical values of L and C.
b) Explain the operation of CUK converter with neat waveforms. 8M CO2
OR
6. a) Explain the operation of Class D chopper with neat waveforms. 6M CO1
b) The buck regulator has a input voltage of Vs = 12 V. The required average output 8M CO3
voltage is Va = 5 V at R = 500 Ω and peak to peak output ripple voltage is 20 mV.
The switching frequency is 25 kHz. If the peak to peak ripple current of inductor
is limited to 0.8 A determine (a) the duty cycle (b) the filter inductance (c) the
filter capacitance (d) the critical values of L and C.
UNIT – IV
7. a) Discuss different modes of ZVS Resonant converter with neat waveforms and 7M CO5
with equivalent circuits.
b) Compare ZCS and ZVS resonant converters. 7M CO2
OR
8. a) Explain the operation of full bridge converter with power circuit and waveforms. 6M CO1
b) Analyze the operation of Forward converter with power circuit and waveforms 8M CO2
UNIT – V
9. a) Derive the performance parameters of Single phase half wave controller with 7M CO2
resistive load
i. RMS output voltage
ii. Average input current and Input power factor
b) Explain the operation of Single phase full wave Ac voltage Controller with RL 7M CO1
with neat waveforms.
OR
10. Explain the operation of Three phase full wave AC voltage Controller with RL 14M CO1
load with neat waveforms.
Code No.: 16MT12303 SET - 4
SREE VIDYANIKETHAN ENGINEERING COLLEGE
(An Autonomous Institution, Affiliated to JNTUA, Anantapur)
I M.Tech. I Semester (SVEC 16) Regular / Supplementary Examinations
ANALYSIS OF POWER CONVERTERS
(Power Electronics and Drives)
Time: 3 Hours Max. Marks: 70
Answer ONE question from each unit
All questions carry equal marks
UNIT – I
1. a) A single phase semi converter is connected to RLE load. The source voltage is 7M CO3
230 V, 50 Hz. The average load current of 10 A is continuous over the working
range. For R = 0.5 Ωand L = 2 mH, compute firing angle delay for E = 120 V.
b) Discuss the power factor improvement technique with power factor leading. 7M CO5
OR
2. a) Analyze the effect of source inductance in single phase fully controlled converter. 6M CO2
b) Discuss freewheeling action in single phase semi controlled converters. 8M CO1
UNIT – II
3. a) A three-phase, half wave converter is operated from a 3-phase, Y-connected 440 6M CO3
V, 50 Hz supply and the load resistance is R = 20 Ω. If it is required to obtain an
average output voltage of 50% of the maximum possible output voltage, calculate:
i. Firing angle, ii. Rectification efficiency and iii. Input power factor.
b) Explain with the help of waveforms the operation of a three phase fully controlled 8M CO1
Converter.
OR
4. a) Evaluate the performance parameters of three phase fully controlled converter 6M CO3
with inductive load.
b) Discuss the continuous and discontinuous modes of operation for three phase fully 8M CO1
controlled converter with RL load.
UNIT – III
5. a) Design a Buck-Boost converter and explain the continuous and discontinuous 6M CO2
modes of operation of Buck-Boost converter with neat waveforms.
b) Explain the operation of Class E chopper with neat waveforms. 8M CO2
OR
6. a) Analyze the operation of quadratic converter with neat waveforms. 6M CO4
b) Explain the continuous and discontinuous modes of operation of Boost converter 8M CO1
with neat waveforms.
UNIT – IV
7. a) Discuss different modes of L-type ZCS Resonant converter with neat waveforms 7M CO1
and with equivalent circuits.
b) Discuss the Zero Current Switching Technique which is incorporated in a resonant 7M CO4
converter.
OR
8. a) Explain the principle of operation of ZCS resonant converter. 7M CO1
b) Explain the operation of Forward converter with power circuit and waveforms. 7M CO1
UNIT – V
9. a) Analyze the operation of Three phase half wave AC voltage Controller with R 7M CO2
load with neat waveforms
b) Derive the performance parameters of three phase full wave controller with star 7M CO2
connected R load
i. RMS output phase voltage
ii. Input power factor
OR
10. a) Explain the operation of three phase full wave AC voltage Controller with RL 7M CO1
with neat waveforms.
b) The three-phase full wave ac voltage controller supplies a Y-connected resistive 7M CO3
load of R = 10 Ω and the line-to-line input voltage is Vs = 208 V (RMS) at 60 Hz.
The delay angle is α = π/3. Determine i) The input PF & ii) The expression for the
instantaneous output voltage of phase A.
Code No.: 16MT12303 SET - 5
SREE VIDYANIKETHAN ENGINEERING COLLEGE
(An Autonomous Institution, Affiliated to JNTUA, Anantapur)
I M.Tech. I Semester (SVEC 16) Regular / Supplementary Examinations
ANALYSIS OF POWER CONVERTERS
(Power Electronics and Drives)
Time: 3 Hours Max. Marks: 70
Answer ONE question from each unit
All questions carry equal marks
UNIT – I
1. a) Explain the forced commutation techniques to improve the input power factor for 7M CO5
DC-AC converters.
b) Explain the effect of source inductance in single phase fully controlled converter. 7M CO1
OR
2. a) Analyze, with the help of waveforms, the operation of a single phase fully 6M CO2
controlled Rectifier.
b) A single phase semi converter is operated from 120 V, 60 Hz supply. The load 8M CO3
current with an average value IDC is continuous and ripple free angle α = π/6.
Determine
i. Displacement Factor
ii. Harmonic factor of input current
iii. Input power factor
UNIT – II
3. a) The three-phase full wave ac voltage controller supplies a Y-connected resistive 6M CO3
load of R = 15Ω and the line-to-line input voltage is Vs = 208 V at 50 Hz. The
delay angle is α = π/6. Determine i) The input PF & ii) The expression for the
instantaneous output voltage of phase A. Draw the output waveforms.
b) Discuss the continuous and discontinuous modes of operation for three phase 8M CO1
Semi controlled converter with R load.
OR
4. a) A three phase full converter is operated from a three phase star connected 208 V, 6M CO3
60 Hz supply and the load resistance is R = 10 Ω. If it is required to obtain an
average output voltage o 50 % of the maximum possible output voltage, calculate
(i) the delay angle α (ii) the rms and average output currents (iii) the average and
rms thyristors currents (iv) the rectification efficiency (v) TUF (vi) the input PF.
b) Discuss the continuous and discontinuous modes of operation for three phase full 8M CO1
controlled converter with RL load.
UNIT – III
5. a) Design the inductor and capacitor for Cuk converter using suitable technique and 6M CO4
derive the inductor current and capacitor voltage for Cuk converter in continuous
mode of operation.
b) Explain the continuous and discontinuous modes of operation of Buck converter 8M CO1
with neat waveforms.
OR
6. a) The input voltage of a cuk converter Vs = 12V. The duty cycle k = 0.25 and the 6M CO3
switching frequency is 25 KHz. The filter inductance is L2 = 150 µH and filter
capacitance is C2 = 220 µF. The energy transfer capacitance is C1 = 200 µF and
inductance is L1 = 180 µH. The average load current is 0.25 A. Determine (i) the
average output voltage (ii) the average output current (iii) the peak to peak output
current ripple of inductor L1 (iv) the peak to peak output voltage ripple of
capacitor C1 (v) the peak to peak output current ripple of inductor L2 (vi) the peak
to peak output voltage ripple of capacitor C2 (vii) the peak current of transistor.
b) Explain the operation of Class E chopper with neat waveforms. 8M CO1
UNIT – IV
7. a) Explain the operation of Fly back converter with power circuit and waveforms. 7M CO1
b) Analyze the step by step procedure for the design of zero-current switching 7M CO4
resonant converter.
OR
8. a) Explain the operation of Push pull converter with power circuit and waveforms. 7M CO1
b) Formulate the operation of ZVS resonant converters with Necessary Diagrams 7M CO2
with R-load.
UNIT – V
9. a) Analyze the operation of Single phase half wave AC voltage Controller with RL 7M CO2
load with neat waveforms.
b) Explain the operation of Single phase Dual Converter RL load with neat 7M CO1
waveforms.
OR
10. Explain the operation of three phase full wave AC voltage Controller with RL 14M CO1
with neat waveforms.
