Guia tecnica: Teoria de tiristores y consideraciones de diseño de Onsemi (Ingles)

Solapas principales

Section 1: Symbols and Terminology   4 Section 2: Theory of Thyristor Operation. 10 Basic Behavior 10 . Switching Characteristics 13  False Triggering 15 Theory of SCR Power Control 16Triac Theory 22  . Methods of Control 24Zero Point Switching Techniques 25    Section 3: Thyristor Drivers and Triggering    . 29 Pulse Triggering of SCRs 29  Effect of Temperature, Voltage and Loads 33Using Negative Bias and Shunting 35   . Snubbing Thyristors 38    . Using Sensitive Gate SCRs 40 Drivers: Programmable Unijunction Transistors 44   Section 4: The SIDAC, A New High Voltage Bilateral Trigger 49 Section 5: SCR Characteristics60 SCR Turn-Off Characteristics 60. SCR Turn-Off Mechanism 60 . SCR Turn-Off Time tq   . 60 Parameters Affecting tq   65 Characterizing SCRs for Crowbar Applications 71   Switches as Line-Type Modulators 79   Parallel Connected SCRs 85  RFI Suppression in Thyristor Circuits 89  Section 6: Applications   . 93 Phase Control with Thyristors 93. Motor Control 94  . Phase Control with Trigger Devices 102  . Cycle Control with Optically Isolated Triac Drivers 105  AC Power Control with Solid-State Relays 110    . Triacs and Inductive Loads 114 Inverse Parallel SCRs for Power Control 117Page Interfacing Digital Circuits to Thyristor Controlled AC Loads 118   . DC Motor Control with Thyristors 127   . Programmable Unijunction Transistor (PUT) Applications 132  Triac Zero-Point Switch Applications 136 . AN1045 - Series Triacs in AC High Voltage Switching Circuits 141AN1048 - RC Snubber Networks for Thyristor Power Control and Transient Suppression 152    . AND8005 - Automatic AC Line Voltage Selector 174    . AND8006 - Electronic Starter for Flourescent Lamps 177AND8007 - Momentary Solid State Switch for Split Phase Motors 181   . AND8008 - Solid State Control Solutions for Three Phase 1 HP Motor 186. AND8015 - Long Life Incandescent Lamps using SIDACs 194  AND8017 - Solid State Control for Bi-Directional Motors 198   . Section 7: Mounting Techniques for Thyristors  . 201 Mounting Surface Considerations 202   Thermal Interface 203Insulation Considerations 204 . Fastening Techniques 209   Insulated Packages 210    Surface Mount Devices 212  . Thermal System Evaluation 214. Section 8: Reliability and Quality    218 Using Transient Thermal Resistance Data in High Power Pulsed Thyristor Applications 218    . Thyristor Construction 230   In-Process Controls and Inspections 230 . Reliability Tests 231 Stress Testing 233 . Environmental Testing 233   Section 9: Appendices   . 234

 

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