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Download (Free) Excel Chart Templates (.xlsx files): Including Advanced charts not found in Excel: Bullet Chart, Mekko Chart, Guage Chart, Tornado Chart, & More!
- Population Pyramid Tutorial
This tutorial will demonstrate how to create a Population...
- Timeline Chart Tutorial
A timeline chart (also known as a milestone chart) is a...
- Panel Chart Tutorial
Download our free Panel Chart Template for Excel. Download...
- Burndown Chart Tutorial
Download the Excel worksheet used in this tutorial and set...
- Quadrant Tutorial
Building the chart from scratch ensures that nothing gets...
- Tornado Chart Tutorial
But unless you use our Chart Creator Add-in that allows you...
- Bell Curve Tutorial
Step #8: Change the chart type of the label series. Our next...
- Pareto Chart Tutorial
In this ArticlePareto Chart – Free Template DownloadGetting...
- Population Pyramid Tutorial
The Silicon-Controlled Rectifier (SCR) If an SCR's gate is left floating (disconnected), it behaves exactly as a Shockley diode. It may be latched by breakover voltage or by exceeding the critical rate of voltage rise between anode and cathode, just as with the Shockley diode.
SCRs are used mainly with high voltages and currents, often to control alternating current (AC) where the change of sign causes the device to switch off automatically. For example, SCRs are used in dimmer switches where the turn-on point occurs at a specific point on the sine curve of the AC supply.
25 mar 2016 · If td is equal to half-a-cycle (10 ms or 8.3 ms respectively for 50 Hz or 60 Hz line frequency), or in other words for 180 ° turn-on delay, the load is totally off. On the contrary, for 0 ° td angle or for 0 ms td time, SCR conducts during a full half-cycle, during 180 ° conduction angle.
Silicon-Controlled Rectifier (SCR) This article covers Silicon-Controlled Rectifier (SCR) construction, Operation, Commutation, Characteristics, Gate Requirements, Testing, and Applications along with the relevant circuit and block diagrams. The SCR is a silicon unilateral three-terminal thyristor. It is the most commonly used and highest power ...
23 cze 2017 · • When the current reaches zero, the SCR turns off. It should be noted that an SCR turn-off, for a current lower than the holding current, can only be seen for low load RMS currents (below approximately 1 A). For high currents, the presence of numerous excess carriers allows the SCR to conduct up to zero without break on the current shape.
SCRs may be turned off by anode current falling below the holding current value (low-current dropout) or by “reverse-firing” the gate (applying a negative voltage to the gate). Reverse-firing is only sometimes effective and always involves high gate current.
