- #1
buildingblocs
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Conduction Angle in SCR Single Phase Rectifiers
- Thread starter buildingblocs
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- Angle Conduction Phase Scr
In summary, the term θ (conductive angle) in a half wave SCR rectifier with RL load represents the voltage/current phase angle caused by the inductor field collapsing. The SCR is fired at the firing angle (α) but continues to conduct until ∏ + θ due to the inductor field collapsing.
- #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
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I thought the SCR is turned on at the firing angle (α).
- #4
buildingblocs
- 17
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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.
Related to Conduction Angle in SCR Single Phase Rectifiers
1. What is conduction angle in SCR single phase rectifiers?
Conduction angle in SCR single phase rectifiers refers to the period of time during which the SCR (silicon-controlled rectifier) conducts current. It is the angle between the point at which the SCR starts to conduct and the point at which it stops conducting.
2. How is conduction angle calculated?
Conduction angle can be calculated by dividing the duration of the conducting period by the total time period and then multiplying by 360 degrees. This can also be expressed as a percentage by multiplying the result by 100.
3. What is the significance of conduction angle in SCR single phase rectifiers?
The conduction angle in SCR single phase rectifiers determines the amount of power that can be delivered to the load. A larger conduction angle allows for more power to be delivered, while a smaller angle results in less power being delivered.
4. How does the load affect the conduction angle in SCR single phase rectifiers?
The load affects the conduction angle in SCR single phase rectifiers by changing the amount of current that is drawn from the circuit. A heavier load will require a larger conduction angle to deliver the required power, while a lighter load will require a smaller angle.
5. How can the conduction angle be controlled in SCR single phase rectifiers?
The conduction angle in SCR single phase rectifiers can be controlled through the use of external circuits and devices such as phase control circuits and variable resistors. These can adjust the timing of the SCR's switching, thereby controlling the conduction angle and the amount of power delivered to the load.
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