Tuesday, November 21, 2017

IAM Search

INDUSTRIAL CONTROL HANDBOOK - 3.1 OVERVIEW OF SCRs, TRIACS, AND TRANSISTORS IN INDUSTRIAL APPLICATIONS

Silicon controlled rectifiers (SCRs), triacs, and high-powered transistors are used in many types of circuits to control larger voltages and currents. Many of these use 480 volt ac three-phase circuits and they may control over 50 A. Control of these large voltages and currents by solid-state devices was difficult until the last few years when larger solid-state devices were developed. Prior to this, engineers designed systems using several smaller devices in parallel to provide the capacity to control the larger currents. The advent of these larger devices has allowed control circuits for general-purpose power supplies, ac and dc variable-speed motor drives, stepper motor controls, servo motor controls, welding power supplies, high-frequency power supplies, and other types of large amplifiers. SCRs, triacs, and other solid-state devices used for switching larger voltages and currents on and off are commonly called thyristors. Thyristors control switching in an on-off manner, similar to a light switch which is different from a transistor that can vary the amount of current in its emitter-collector circuit by changing the bias on its base. The amount of current that flows through a thyristor must be controlled by adjusting the point in a sine wave where the device is turned on.

filler_003_scr_triac_transistor.jpg

GO TO NEXT PAGE: INDUSTRIAL CONTROL HANDBOOK - 3.2 SILICON CONTROLLED RECTIFIERS (SCRs)

GO BACK TO PREVIOUS PAGE: INDUSTRIAL CONTROL HANDBOOK - 2.9 CONTROL OF MOTORS

GO TO MAIN PAGE: INDUSTRIAL CONTROL HANDBOOK - TABLE OF CONTENTS

Comments (0)Add Comment

Write comment

security code
Write the displayed characters


busy

Related Articles

Promotions

  • ...more

Disclaimer

Important: All images are copyrighted to their respective owners. All content cited is derived from their respective sources.

Contact us for information and your inquiries. IAMechatronics is open to link exchanges.

IAMechatronics Login