- #1
buildingblocs
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Conduction Angle in SCR Single Phase Rectifiers
- Thread starter buildingblocs
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- Angle Conduction Phase Scr
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SUMMARY
The discussion focuses on the conduction angle (θ) in single-phase SCR (Silicon Controlled Rectifier) half-wave rectifiers with RL (Resistor-Inductor) loads. It clarifies that the firing angle (α) is the point at which the SCR begins conducting, while the conduction angle (θ) represents the duration of conduction influenced by the RL circuit's phase angle. The SCR continues to conduct until the angle reaches π + θ, due to the inductor's collapsing magnetic field. This distinction is crucial for understanding SCR operation in power electronics.
PREREQUISITES- Understanding of SCR operation and characteristics
- Knowledge of phase angles in RL circuits
- Familiarity with half-wave rectification principles
- Basic electrical engineering concepts related to inductance
- Study the impact of firing angle (α) on SCR performance
- Explore the behavior of RL circuits during SCR conduction
- Learn about the mathematical modeling of SCR circuits
- Investigate the effects of load variations on conduction angle
Electrical engineers, power electronics specialists, and students studying SCR applications in rectification and control systems.
- #2
meBigGuy
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considering a single period to be 0 to 360 degrees, the scr turns on at the conduction angle.
- #3
buildingblocs
- 17
- 1
I thought the SCR is turned on at the firing angle (α).
- #4
buildingblocs
- 17
- 1
Below are the formulas that I am referring to:
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FireShot Screen Capture #014 - 'Microsoft Word - ECE3051_2008_exam_formula_doc - ECE3051_2008_ex.png -
FireShot Screen Capture #015 - 'Microsoft Word - ECE3051_2008_exam_formula_doc - ECE3051_2008_ex.png -
FireShot Screen Capture #016 - 'Microsoft Word - ECE3051_2008_exam_formula_doc - ECE3051_2008_ex.png
- #5
meBigGuy
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OK, my bad. Firing angle is angle at which it starts conducting, conduction angle is angle over which it conducts.
But theta in the above circuit is the voltage/current phase angle caused by the RL circuit. The SCR is fired at α, but conducts beyond ∏ -α because of the inductor field collapsing, represented by theta. So it continues to conduct until ∏ + theta.
But theta in the above circuit is the voltage/current phase angle caused by the RL circuit. The SCR is fired at α, but conducts beyond ∏ -α because of the inductor field collapsing, represented by theta. So it continues to conduct until ∏ + theta.
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