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Note for Power Electronics - PE by Abhishek Kumar

  • Power Electronics - PE
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  • Biju Patnaik University of Technology BPUT - BPUT
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Abhishek Kumar
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EE6503 S.NO 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 2.1 2.2 2.3 2.4 2.5 www.Vidyarthiplus.com CONTENT CHAPTER I POWER SEMI-CONDUCTOR DEVICES Introduction to power electronics Power semiconductor devices Power diode 1.3.1Power diode characteristics: 1.3.2 Diode selection 1.3.3 Diode protection 1.3.4 Power diode applications 1.3.5 Types of power diode Thysistor 1.4.1Static V-I characteristics of a thyristor 1.4.2Modes of operation 1.4.3 Turn on methods 1.4.4 Switching characteristics of thyristors GTO(gate turn off thyristor) 1.5.1 Gate turn-on and turn off TRIAC Power BJT 1.7.1 Signal level of BJT 1.7.2 Power BJT construction Thyristor protection 1.8.1 Over current protection Gate protection Insulated gate bipolar transistor(IGBT) Power MOSFET 1.11.1Switching characteristics 1.11.2 IGBT characteristics Parallel operation of SCR Glossary UNIT II PHASE-CONTROLLED CONVERTERS Introduction Single phase half wave circuit with R-L load Single phase full converter Single phase half wave circuit with RLE load Single phase full wave converter: 2.6 Single phase semi converter Glossary Unit III DC TO DC CONVERTER 3.1 Introduction 3.2 Types of chopper: 3.2.1First quadrant or type a chopper 3.2.3 Second quadrant or type b chopper 3.3.4 Swo quadrant type a chopper or, type c chopper SCE POWER ELECTRONICS Page no 6 6 6 7 7 7 8 8 8 9 10 10 12 14 15 17 18 18 19 20 21 22 22 22 23 24 30 33 34 34 36 38 42 43 44 45 46 46 46 47 DEPARTMENTT OF ELECTRICAL AND ELECTRONICS ENGINEERING www.Vidyarthiplus.com

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EE6503 3.4 4.1 4.2 4.3 4.4 4.5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 SCE www.Vidyarthiplus.com POWER ELECTRONICS 3.3.5 Swo quadrant type b chopper, or type d chopper 3.3.6 Four quadrant chopper, or type e chopper Steady state analysis of practical buck chopper Glossary UNIT IV INVERTERS Single phase voltage source inverters Single phase full bridge converter Types of inverter 4.3.1 Pulse width model Pulse width modulated inverters Pulse width modulated switching scheme Three phase inverter 180-Degree conduction 120-Degree conduction Glossary UNIT V AC TO AC CONVERTERS Introduction Three-phase, three-wire ac regulator with balanced resistive load Three-phase delta-connected ac regulator with balanced resistive load AC voltage control techniques 5.4.1Phase control 5.4.2Principle of on-off control technique Full bridge ac voltage controller. Single phase cycloconverter Three phase cycloconverter. Three-phase to three-phase (3f-3f) cycloconverter 5.8.1Blocked mode and circulating current mode 5.8.2Circulating current cycloconverters mode Matrix converter 5.9.1Single-phase to three-phase (1f-3f) cycloconverters 5.9.2 Integral pulse modulated (1f-3f) cycloconverters 5.9.3Phase-controlled (1f-3f) cycloconverter Glossary Question Bank 48 48 49 53 55 56 57 57 58 59 61 62 63 67 68 72 75 77 77 78 80 84 85 87 88 89 90 91 91 92 92 93 94 DEPARTMENTT OF ELECTRICAL AND ELECTRONICS ENGINEERING www.Vidyarthiplus.com

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EE6503 www.Vidyarthiplus.com POWER ELECTRONICS EE6503 POWER ELECTRONICS OBJECTIVES: To get an overview of different types of power semiconductor devices and their switching characteristics. To understand the operation, characteristics and performance parameters of controlled rectifiers To study the operation, switching techniques and basics topologies of DCDC switching regulators. To learn the different modulation techniques of pulse width modulated inverters and to understand harmonic reduction methods. To study the operation of AC voltage controller and various configurations. UNIT I POWERSEMI-CONDUCTOR DEVICES 9 Study of switching devices, Diode, SCR,TRIAC, GTO, BJT, MOSFET, IGBTStatic and Dynamiccharacteristics - Triggering and commutation circuit for SCRDesign of Driver and snubber circuit. UNIT II PHASE-CONTROLLED CONVERTERS 9 2-pulse,3-pulse and 6-pulseconverters– performance parameters –Effect of source inductance–– Gate Circuit Schemes for Phase Control–Dual converters. UNIT III DC TO DC CONVERTER 9 Step-down and step-up chopper-control strategy–Forced commutated chopper– Voltage commutated,Current commutated, Load commutated, Switched mode regulators- Buck, boost, buck- boost converter, Introduction to Resonant Converters. UNIT IV INVERTERS 9 Single phase and three phase voltage source inverters(both 120 modeand 180 mode)–Voltage&harmonic control--PWM techniques: Sinusoidal PWM, modified sinusoidal PWM - multiple PWM – Introduction to space vector modulation –Current source inverter. UNIT V AC TO AC CONVERTERS 9 Single phase and Three phase AC voltage controllers–Control strategy- Power Factor Control –Multistage sequence control -single phase and three phase cyclo converters –Introduction to Matrix converters. TOTAL:45 PERIODS OUTCOMES: Ability to understand and analyse, linear and digital electronic circuits. TEXT BOOKS: 1. M.H.Rashid, „Power Electronics: Circuits, Devices and Applications‟, Pearson Education, PHI Third Edition, New Delhi, 2004. 2. P.S.Bimbra “Power Electronics” Khanna Publishers, third Edition, 2003. 3. L. Umanand, “ Power Electronics Essentials and Applications”, Wiley, 2010. REFERENCES: 1. Joseph Vithayathil,‟ Power Electronics, Principles and Applications‟, McGraw Hill Series, 6thReprint, 2013. 2. Ashfaq Ahmed Power Electronics for Technology Pearson Education, Indian reprint, 2003. 3. Philip T. Krein, “Elements of Power Electronics” Oxford University Press, 2004 Edition. 4. Ned Mohan, Tore. M. Undel and, William. P. Robbins,„Power Electronics: Converters, Applications and Design‟, John Wiley and sons, third edition,2003. 5. Daniel.W.Hart, “Power Electronics”, Indian Edition, McGraw Hill, 3rd Print, 2013. 6. M.D. Singh and K.B. Khanchandani, “Power Electronics,” McGraw Hill India, 2013 SCE DEPARTMENTT OF ELECTRICAL AND ELECTRONICS ENGINEERING www.Vidyarthiplus.com

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EE6503 www.Vidyarthiplus.com POWER ELECTRONICS UNIT I POWER SEMI-CONDUCTOR DEVICES 1.1INTRODUCTION TO POWER ELECTRONICS The control of electric motor drives requires control of electric power. Power electronics have eased the concept of power control. Power electronics signifies the word power electronics and control or we can say the electronic that deal with power equipment for power control. Power electronics based on the switching of power semiconductor devices. With the development of power semiconductor technology, the power handling capabilities and switching speed of power devices have been improved tremendously. 1.2Power Semiconductor Devices The first SCR was developed in late 1957. Power semiconductor devices are broadly categorized into 3 types: 1. Power diodes 2. Transistors 3. Thyristors Power diodes 1.3Power diode: Diode is a two terminal P-N junction semiconductor device, with terminals anode (A) and cathode (C). Symbol: The symbol of the Power diode is same as signal level diode. If terminal A experiences a higher potential compared to terminal K, the device is said to be forward biased and a forward current will flow from anode to cathode. This causes a small voltage drop across the device (<1V) called as forward voltage drop(Vf), which under ideal conditions is usually ignored. By contrast, when a diode is reverse biased, it does not conduct and the diode then experiences a small current flowing in the reverse direction called the leakage current. It is shown below in the VI characteristics of the diode. The Structure of Power Diode is different from the low power signal diode. SCE DEPARTMENTT OF ELECTRICAL AND ELECTRONICS ENGINEERING www.Vidyarthiplus.com

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