Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: R R-C Firing Circuits Disadvantages
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Power Electronics > R R-C Firing Circuits Disadvantages

R R-C Firing Circuits Disadvantages

Last updated: September 19, 2016 3:58 am
Editorial Staff
Power Electronics
No Comments
Share
2 Min Read
SHARE

Firing Circuits:

Gate triggering is the most commonly used turn-on method employed to switch on the thyristors. Triggering circuits is also called firing circuits. There are various firing circuits available. R-Firing circuits is simple but suffer from limited firing circuits. Firing angle is limited between 0o to 90o.

In actual practice firing angle can be varied between 3o to 90o. Limitation of the firing angle range of R-Firing circuit is eliminated by introducing a capacitor and a diode. Thus R-C firing circuits can increase the firing angle limitation range. Theoretically firing angle can be varied from 0o to 180o. However due to low voltage at 0o and 180o thyristor cannot be turn-on. Hence practically the range of firing angle is between 3o and 177o.

Both R and R-C firing circuits suffer from following disadvantage:

  • They can be employed in power circuits having only one thyristor
  • They are capable of open loop control only
  • Due to lower voltages near 0o to 180o, gate current is small. Especially in R-C firing circuit, near 180o gate current is minimum due to maximum value of R. This will increase the turn on time, especially for R-L load, leading to higher turn on loss
  • Higher frequency gate signal is desirable for reliable turn on. Both the circuits are not capable of providing the same
  • There is no electrical isolation between control circuit and power circuit

However the circuits are simple and cheap. R-C firing circuits is widely used in low power thyristor controllers, such as solid state ac regulators for speed control of fans and blowers. R-C firing circuits can also acts as snubber circuits

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Phase Controlled Rectifier – Half Controlled Rectifier with R Load
Thyristors – Working, VI Characteristics, Turn ON Methods
Basics of Thyristor
Power Electronics Objective Questions
How to test SCR using Multimeter
Top 100 Power Electronics Projects for Engineering Students
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Phase-Controlled Half-Wave Rectifier With Freewheeling Diode
Thyristor Protection Circuits (SCR) – Types, Principle, Explanation
Power Electronic Devices Specification and Classification
SCR Switching Characteristics
Types of IGBT
What is Power Electronics? Evolution, Block Diagram, Advantages
Turning Off SCR – Commutation
Power Diode – Characteristics, Construction, Working, Advantages

Keep Learning

Silicon-Controlled Rectifier (SCR)

Introduction to Thyristor – History, Types, Principle, Advantages

Crowbar fault protection circuit

Crowbar fault protection circuit

IGBT Switching Characteristics

IGBT – Symbol, Construction, Working, Characteristics, Advantages

RC Triggering

SCR Triggering Methods

Procedure to test the TRIAC

How to Test TRIAC with Multimeter

Resistance firing of an SCR in a half-wave circuit

Thyristor Triggering Circuits – Types, Explanation, Waveforms (SCR)

SCR Full Bridge Converter

Power Electronics – Full-wave Rectifier With R and RL Load

SCR Class B Resonant-Pulse Commutation

Thyristor Commutation Techniques – Types, Working Principles

Learn More

Advantages of VoIP technology

What is VoIP and How Does it Work? Advantages & applications

Solenoid Valve Design

Solenoid Valve Selection Criteria

Transistor as an Amplifier in Common Emitter

Transistor as an Amplifier in Common Emitter

Learn about PLC, DCS, RTU, SCADA, and PAC

Learn about PLC, DCS, RTU, SCADA, and PAC

Automotive Rail Rapid Transit

Automotive Rail Rapid Transit

Servo Tank Gauge Level Principle

Servo Tank Gauges Working Principle

Simatic Hardware Configuration

Configuration of Profibus Network in Siemens PLC

Contextual HMI

What is Contextual HMI? – HMI Screens on a Mobile or Tablet

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?