logging in or signing up SCR sab16 Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 1367 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: February 04, 2012 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Silicon Controlled Rectifiers: Silicon Controlled RectifiersSilicon Controlled Rectifier : Silicon Controlled Rectifier A S ilicon C ontrolled R ectifier (or S emiconductor C ontrolled R ectifier) is a four layer solid state device that controls current flow The name “silicon controlled rectifier” is a trade name for the type of thyristor commercialized at General Electric in 1957Silicon Controlled Rectifier : Silicon Controlled Rectifier An SCR can be seen as a conventional rectifier controlled by a gate signal It is a 4-layered 3-terminal device When the gate to cathode voltage exceeds a certain threshold, the device turns 'on' and conducts currentSilicon Controlled Rectifier : Silicon Controlled Rectifier The operation of a SCR can be understood in terms of a pair of tightly coupled B ipolar J unction T ransistors SCR has three states: Reverse blocking mode, forward blocking mode, and forward conducting modeV-I Characteristic Curve: V-I Characteristic CurveSilicon Controlled Rectifier: Silicon Controlled Rectifier Industrially SCRs are applied to produce DC voltages for motors from AC line voltage Rectifier Half-wave rectifier, full-wave rectifierHalf-wave rectifier: Half-wave rectifierHalf-wave rectifier: Half-wave rectifierHalf-wave rectifier: Half-wave rectifierPowerPoint Presentation: 題目： 已知 SCR 的 IGT 為 20mA , 請問直流電壓由 0V 向上調整 , 要調到多少伏特 ,SCR 才導通 ? 解答： 由基本原理說明可知 V=20m ×150+0.7=3.7V 。Reviews: Reviews A SCR is essentially a diode with an extra terminal added This extra terminal is called the gate, and it is used to trigger the device into conduction by the application of a small voltageApplication: DC Motor Driver: Application: DC Motor Driver DC motor speed generally depends on a combination of the voltage and current flowing in the motor coils and the motor loads or braking torque The speed of the motor is proportional to the voltage, and the torque is proportional to the currentDC Motors Current Driver: DC Motors Current Driver A rectifier is one or more diodes arranged for converting AC to DC The current used to drive the DC motor typically comes from : Fixed voltage: Battery Voltage regulator Adjustable voltage: PWM current source Silicon controlled rectifier modulated AC sourceDC Motors Current Drives : DC Motors Current Drives Voltage regulatorDC Motors Current Drives : DC Motors Current Drives Linear power transistor & OP ampDC Motors Current Drives : DC Motors Current Drives Pulse Width ModulationDC Motors Current Drives : DC Motors Current DrivesDC Motors Current Drives : DC Motors Current Drives You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.