Questions and Answers
What is the main focus of the ECE 03 Electronics 3 course?
The course involves the theory, operating characteristics, and design of electronics devices and control circuits for industrial processes.
Which of the following textbooks is recommended for the course?
What is the passing weighted average for the grading system?
60%
The class of solid-state silicon switching devices known as ______ is used to control large amounts of current.
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Thyristors require a continuous supply of control current to stay on after being triggered.
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Which of the following is an example of a unidirectional thyristor?
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What are the three states of thyristors?
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What does the SCR's gate terminal do?
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The SCR can control powers as high as ______ with individual ratings.
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Study Notes
Course Overview
- Focus on electronics devices and control circuits for industrial processes.
- Applications include industrial control, electronic instrumentation, transducers, and data acquisition systems.
- Key topics include interfacing techniques and sensors.
Course Materials
- Main textbooks include "Electronic Devices and Circuit Theory" by Boylestad and Nashelsky and "Basic Electronics" by Gupta.
- Additional references: "Grob's Basic Electronics" and "A Textbook of Electronics Engineering".
Course Requirements and Grading
- Exams constitute 40% of total grade.
- Quizzes account for 30%.
- Assignments/SWs make up 15%, while attendance/recitation contributes 15%.
- Passing grade is a weighted average of 60%.
Course Content
- Introduction to various devices such as SCRs and UJTs.
- Exploration of TRIACs, DIACs, optoelectronic devices, sensors, and transducers.
- Study of programmable logic controllers and building management systems (HVAC).
- Inclusion of security systems, audio/video controls, and supervisory controls.
- Discussion on fire and life safety controls.
Thyristors
- Thyristors are solid-state devices made of a four-layer PNPN structure.
- Used primarily for controlling large currents in industrial equipment.
- Require a single control pulse to activate but no continuous control current.
- Act as low-resistance paths when triggered, sustaining conduction until current falls below holding level.
Types of Thyristors
-
Unidirectional Thyristors:
- Allow current flow in one direction.
- Examples: SCR, Shockley diode.
-
Bidirectional Thyristors:
- Permit current flow in both directions.
- Examples: DiACs, TRIACs.
States of Thyristors
-
Reverse Blocking Mode:
- Voltage direction opposes conduction.
-
Forward Blocking Mode:
- Voltage allows conduction but thyristor is untriggered.
-
Forward Conducting Mode:
- Triggered into conduction, remains conducting until current drops below holding current.
Common Thyristor Types
- Shockley Diode
- Silicon Controlled Rectifier (SCR)
- Light Activated SCR (LASCR)
- Silicon Unilateral Switch (SUS)
- Diode for AC (DIAC)
- Triode for AC (TRIAC)
- Silicon Controlled Switch (SCS)
- Programmable Unijunction Transistor (PUT)
Silicon Controlled Rectifier (SCR)
- SCR includes a third gate terminal for control.
- Constructed from silicon for high temperature and power capabilities.
- Controls power levels up to 10 MW, with individual ratings reaching 200 Amperes at 1800 Volts.
- Operates effectively up to approximately 50 kHz.
- Introduced in 1956 by Bell Telephone Laboratories.
- Dynamic resistance in the conduction state is between 0.01 to 0.1Ω; reverse resistance typically exceeds 100 kΩ.
- Triggering methods include gate control, temperature increase, and anode-to-cathode voltage elevation.
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Description
Explore the principles of electronics systems and design in this comprehensive quiz. Focused on the theory, operating characteristics, and practical applications of electronic devices and control circuits, it covers topics like industrial control and instrumentation. Perfect for BSECE students looking to test their knowledge.
