how to find firing angle to charge battery.

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love_electronic

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i want to design a battery charger based on microcontroller (for e.g 12v 4A SLA battery).The technique i wanna use is full controlled battery charger based on scr.
i wanna know that, how i can find the firing angle and what parameters should i measure in microcontroller to calculate the firing angle (like battery voltage,current).
hope you guys will help me out.
 

You may want to implement a constant current/voltage controller and set the firing angle in closed loop feedback rather than "calculating" it.
 

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