module-1-introduction-power-electronics-notes-with-important-highlights.pdf

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Technical University of Mombasa*
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ELECTRICAL ECI 2202
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Feb 9, 2024
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module-1-introduction-power-electronics-notes-with-important-highlights.pdf

School
Technical University of Mombasa*
*We are not endorsed by this school
Course
ELECTRICAL ECI 2202
Pages
31
Upload Date
Feb 9, 2024
Uploaded by GrandDangerBear32 on coursehero.com
Module 1 - INTRODUCTION & POWER ELECTRONICS - notes with important highlights Power Electronics (Visvesvaraya Technological University) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Module 1 - INTRODUCTION & POWER ELECTRONICS - notes with important highlights Power Electronics (Visvesvaraya Technological University) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Downloaded by kim steve ([email protected]) lOMoARcPSD|37314578
Power Electronics 2018-19 DEPT. OF ECE, ATMECE Page 1 Module -1 INTRODUCTION & POWER ELECTRONICS Structure 1.0 Introduction 1.1 Objectives 1.2 Power Electronics Applications 1.3 Power Semiconductor devices 1.4 Control Characteristics of power Devices 1.5 Types Of Power Converters 1.6 Periphral Effects 1.7 Bipolar Junction Transistor 1.8 Transistor as switch 1.9 Switching Characteristics 1.10 Switching Limits 1.11 Recommended Questions 1.12 Outcomes 1.13 Further Readings 1.0 INTRODUCTION TO POWER ELECTRONICS Power Electronics is a field which combines Power (electric power), Electronics and Control systems. Power engineering deals with the static and rotating power equipment for the generation, transmission and distribution of electric power. Electronics deals with the study of solid state semiconductor power devices and circuits for Power conversion to meet the desired control objectives (to control the output voltage and output power). Power electronics may be defined as the subject of applications of solid state power semiconductor devices (Thyristors) for the control and conversion of electric power. 1.1 Objectives: Study the different types of power semiconductor devices and their switching characteristics. Study the different types of power converters is useful for different applications such as UPS, Inverters, DC motor control etc. 1.2 Power Electronic Applications 1. COMMERCIAL APPLICATIONS Heating Systems Ventilating, Air Conditioners, Central Refrigeration, Lighting, Computers and Office equipments, Uninterruptible Power Supplies (UPS), Elevators, and Downloaded by kim steve ([email protected]) lOMoARcPSD|37314578
Power Electronics 2018-19 DEPT. OF ECE, ATMECE Page 2 Emergency Lamps. 2. DOMESTIC APPLICATIONS Cooking Equipments, Lighting, Heating, Air Conditioners, Refrigerators & Freezers, Personal Computers, Entertainment Equipments, UPS. 3. INDUSTRIAL APPLICATIONS Pumps, compressors, blowers and fans. Machine tools, arc furnaces, induction furnaces, lighting control circuits, industrial lasers, induction heating, welding equipments. 4. AEROSPACE APPLICATIONS Space shuttle power supply systems, satellite power systems, aircraft power systems. 5. TELECOMMUNICATIONS Battery chargers, power supplies (DC and UPS), mobile cell phone battery chargers. 6. TRANSPORTATION Traction control of electric vehicles, battery chargers for electric vehicles, electric locomotives, street cars, trolley buses, automobile electronics including engine controls. 1.3 POWER SEMICONDUCTOR DEVICES The power semiconductor devices are used as on/off switches in power control circuit. These devices are classified as follows. A. POWER DIODES Power diodes are made of silicon p-n junction with two terminals, anode and cathode. Diode is forward biased when anode is made positive with respect to the cathode. Diode conducts fully when the diode voltage is more than the cut-in voltage (0.7 V for Si). Conducting diode will have a small voltage drop across it. Diode is reverse biased when cathode is made positive with respect to anode. When reverse biased, a small reverse current known as leakage current flows. This leakage current increases with increase in magnitude of reverse voltage until avalanche voltage is reached (breakdown voltage). Downloaded by kim steve ([email protected]) lOMoARcPSD|37314578
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