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Posted By: rama Member Level: Silver Posted Date: 10 Jun 2008
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2008 Anna University B.E Electronics and Communication EC1010 POWER ELECTRONICS Question paper
EC1010 POWER ELECTRONICS
AIM
Application of Electronic knowledge in industry for rectification of polyphase supply voltage and for control of motor speed and for thermal heating.
OBJECTIVES
• To study about power electronic circuits for voltage and current control and protection.
• To learn the switching characteristics of transistors and SCRs. Series and parallel functions of SCRs, Programmable triggering methods of SCR.
• To learn controlled rectification AC supplies.
• To study of converters and inverters.
• To learn about motor control, charges, SMPS and UPS.
UNIT I POWER ELECTRONICS DEVICES 9
Characteristics of power devices – characteristics of SCR, diac, triac, SCS, GTO, PUJT – power transistors – power FETs – LASCR – two transistor model of SCR – Protection of thyristors against over voltage – over current, dv/dt and di/dt.
UNIT II TRIGGERING TECHNIQUES 9
Turn on circuits for SCR – triggering with single pulse and train of pulses – synchronizing with supply – triggering with microprocessor – forced commutation – different techniques – series and parallel operations of SCRs.
UNIT III CONTROLLED RECTIFIERS 9
Converters – single phase – three phase – half controlled and fully controlled rectifiers – Waveforms of load voltage and line current under constant load current – effect of transformer leakage inductance – dual converter.
UNIT IV INVERTERS 9
Voltage and current source inverters, resonant, Series inverter, PWM inverter. AC and DC choppers – DC to DC converters – Buck, boost and buck – boost.
UNIT V INDUSTRIAL APPLICATIONS 9
DC motor drives – Induction and synchronous motor drives – switched reluctance and brushless motor drives – Battery charger – SMPS – UPS – induction and dielectric heating.
TOTAL : 45
TEXT BOOKS
1. Muhamed H.Rashid : Power Electronics Circuits, Devices and Applications, 3rd Edn. 2004 PHI.
2. Singh and Kanchandani : Power Electronics, TMH, 1998.
REFERENCES
1. Sen : Power Electronics, TMH, 1987.
2. Dubey : Thyristorised power controllers, Wiley Eastern 1986.
3. Vithayathil : Power Electronics – Principles and applications McGraw-Hill, 1995.
4. Lander : Power Electronics, 3rd Edition, McGraw-Hill, 1994.
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