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PHASE-ANGLE CONTROL OF SCR USING AT89C51


Posted by: seminar class
Created at: Tuesday 22nd of March 2011 12:35:11 AM
Last Edited Or Replied at :Monday 22nd of April 2013 01:54:25 AM
phase angle control using scr , thyristor phase angle, scr zero crossing current detector , thyristor angle control, phase ange control in phase controlled rectifiers , zero crossing detector for 230v, firing angle pdf ppt , thyristor firing angle through microprocessor, ppt for firing of thyristor based on microcontroller , use scr to phase shift for controlling current, how to genarate firing pulses for scr , phase angle control of scr, scr zero crossing detector , microcontroller based 3ph firing angle control fundamentals, thyristor fire angle controller with microcontroller , zero crossing detector based scr firing, standalone zero crossing detector , at89c51,
off, pulling the output higher. This results in a very short positive pulse, which is available at the collector, (at point ‘B’) as shown in the second waveform.
3. As this positive pulse is inverted by transistor T2, it produces one negative pulse of the same width at ‘C’. This is shown as the thied
Waveform.
4. This negative pulse is fed to the interrupt pin (INT1) of the microcontroller, which acts as an interrupt for the microcontroller. The microcontroller then generates a positive pulse on P2.0 (at point ‘D’) after some delay. This turns ‘off’ the internal LED of the ..................[:=> Show Contents <=:]



PHASE-ANGLE CONTROL OF SCR USING AT89C51


Posted by: seminar class
Created at: Tuesday 22nd of March 2011 12:35:11 AM
Last Edited Or Replied at :Monday 22nd of April 2013 01:54:25 AM
phase angle control using scr , thyristor phase angle, scr zero crossing current detector , thyristor angle control, phase ange control in phase controlled rectifiers , zero crossing detector for 230v, firing angle pdf ppt , thyristor firing angle through microprocessor, ppt for firing of thyristor based on microcontroller , use scr to phase shift for controlling current, how to genarate firing pulses for scr , phase angle control of scr, scr zero crossing detector , microcontroller based 3ph firing angle control fundamentals, thyristor fire angle controller with microcontroller , zero crossing detector based scr firing, standalone zero crossing detector , at89c51,
The
Anode of SCR IS CONNECTED TO THE LOAD (BULB) WITH THE 230v AC supply.
A 12MHz crystal along with capacitors C5 and C4 are connected to the microcontroller pins 18 and 19 to provide the basic clock to the microcontroller. Power on reset is derived by using capacitor C6 and resistor R6. Switch S4 is used for a manual reset.
The operation
The complete operation can be well understood with the help of waveform in Fig.3.
1. The waveform at point ‘A’ is a fully rectified wave that is fed to the base of T1.
2. When the base voltage falls below 0.7V, transistor T1 is switched of..................[:=> Show Contents <=:]



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