Introduction & Types Youtube: Power Electronics

Slides:

Advertisements

Similar presentations

Thyristors Why Thyristors?.

Advertisements

Power Semiconductor Systems I

Electronic Power and Control Electronic Power and Control

CHAPTER SEVEN (New textbook)

Chapter 2 AC to DC CONVERSION (RECTIFIER)

Instructor: Eng.Moayed N. EL Mobaied

Instructor: Eng. Jalal Al Roumy

Chapter 20: pnpn and Other Devices

Instructor: Eng.Moayed N. EL Mobaied

POWER ELECTRONICS Instructor: Eng.Moayed N. EL Mobaied The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department بسم الله.

Electronic Devices Ninth Edition Floyd Chapter 11.

Single-Phase Controlled Rectifiers Chp#6

Semiconductors If the semiconductor has a few per million atoms with FIVE outermost (valence) electrons .... The “extra” electron is NEGATIVELY charged.

Power Electronics Dr. Imtiaz Hussain Assistant Professor URL :

9/29/2004EE 42 fall 2004 lecture 131 Lecture #13 Power supplies, dependent sources, summary of ideal components Reading: Malvino chapter 3, Next:

ECE 442 Power Electronics1 SCR/Thyrisitor pnpn structure with 3 pn junctions.

SCR/Thyrisitor pnpn structure with 3 pn junctions.

Chapter 4 AC to AC Converters

Power Electronics Introduction Bipolar Transistor Power Amplifiers

Instrumentation & Power Electronics

SINGLE PHASE HALF CONTROLLED BRIDGE RECTIFIER WITH RESISTIVE LOAD

Diode :- Clamper Positive Clamper The circuit for a positive clamper is shown in the figure. During the negative half cycle of the input signal, the diode.

CH3 Half-wave rectifiers (The basics of analysis)

SEMICONDUCTORS Thyristor.

POWER ELECTRONICS Instructor: Eng. Jalal Al Roumy The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department بسم الله الرحمن.

Gate Turn-Off Thyristor

Parul Institute of Engineering & Technology Name of Unit : Diode And Its Applications___________ Topic : BRIDGE RECTIFIER_________________________ Name.

Ashraful Haider Chowdhury

Instrumentation & Power Electronics

Chapter 17 pnpn and Other Devices

Ashraful Haider Chowdhury

Power Semi-Conductors. Learning Outcomes At the end of the lesson, students should be able to : Explain the characteristic and operation of Silicon Controlled.

SAMPLE AND HOLD CIRCUIT. CIRCUIT CONSTRUCTION The circuit samples the input and holds the last sample until the input sampled again. The circuit has an.

Diode Rectifier Circuits Section 4.5. In this Lecture, we will:  Determine the operation and characteristics of diode rectifier circuits, which is the.

Power Electronics Dr. Imtiaz Hussain Assistant Professor URL :

Electronics for Physical Computing Materials: capacitor, diode, LED, transistor, switch,resistor, relay, proto board, multimeter.

Clipper circuits LET’S REMOVE UNWANTED PART OF SIGNALS.

Direct Current A Direct Current (or DC) power supply moves electrons through the wire in ONE DIRECTION ONLY. For an electron to deliver its energy to the.

Controlled Rectifiers. Thyristor Thyristors have three states: Reverse blocking mode Forward blocking mode Forward conducting mode.

Types Of Thyristors And Their Applications

Gate Turn On Turn Off Thyristors. What is a thyristor? Thyristors are power semiconductor devices used in power electronic circuits They are operated.

UNIT III DC Choppers.

Power Electronics. Power Electronics Why Germanium is not used for manufacturing Controlled Rectifiers.

Diode Clipping Circuits

Chapter 2 Power Electronic Devices

What is direct current (DC)?

Power Semiconductor Systems I

Capacitor Action Topics covered in this presentation: Capacitors on DC

Solid state switches ,solenoids

Fault detection Lecture (3).

Dr John Fletcher Rm 131 Power Electronics Dr John Fletcher Rm 131.

UNIT 4 CONTROLLED RECTIFIERS

Dr. Unnikrishnan P.C. Professor, EEE

DC- AC CONVERTER-INVERTER

SCR / Thyristor Circuit Symbol and Terminal Identification.

DC Choppers 1 MH1032/brsr/A.Y /pe/DC CHOPPERS

Power Electronic Drives - DC to AC converter / Inverter

ECE 442 Power Electronics Text:

UNIT 3 THYRISTORS 11/27/2018.

Power Electronics Introduction Bipolar Transistor Power Amplifiers

Reading: Malvino chapter 3, Next: 4.10, 5.1, 5.8

ELL100: INTRODUCTION TO ELECTRICAL ENGG.

Dr. Unnikrishnan P.C. Professor, EEE

Dr. Unnikrishnan P.C. Professor, EEE

Dr. Unnikrishnan P.C. Professor, EEE

Rectifiers. Introductions of rectifiers: IN PARTICLE ACCELERATORS, ELECTRONS OR OTHER CHARGED PARTICLES ARE FORCED TO MOVE ALONG ORBITS OR TRAJECTORIES.

Presentation transcript:

Introduction & Types Youtube: Power Electronics SCR Turn Off Introduction & Types Youtube: Power Electronics

Commutation The process of turning OFF SCR is defined as "Commutation“ By turning OFF a thyristor we bring it from forward conducting to the forward blocking mode.

Conditions to Turn Off an SCR The condition to be satisfied in order to turn OFF an SCR are: IA < IH ( Anode current must be less than holding current) A reverse voltage is applied to SCR for sufficient time enabling it to recover its blocking state.

Methods of commutation Natural Commutation Forced Commutation

Natural Commutation Used in AC circuits, the current always passes through zero for every half cycle. As the current passes through natural zero, a reverse Voltage will simultaneously appear across the device. No external circuit is required for this purpose.

Forced Commutation Used in DC circuits the forward current should be forced to zero by means of some external circuits. To turn OFF a thyristor, the forward anode current should be brought to zero for sufficient time to allow the removal of charged carriers.