digital automatic voltage regulator

[sasidhar yalavarthi]

 

i am using atmega 32 to generate pwm but i dont know how to vary duty cycle from it.

actually i want to make an automatic voltage regulator for synchronous generator.

first i will make terminal voltage step down rectify and use adc of mcu to get some value . 

i will keep some reference.

if terminal voltage decreases then field voltage should increase for that duty cycle should slowly increase.

 

this is my whole idea.

 

but i dont know how to calculate error and increase duty cycle in steps.

 

i know codes for pwm and adc but i dont know the code for how to check error between measured and reference and to increase the pwm duty cycle accordingly

[AJISH ALFRED]

 

Hi Sasidhar,

                    Interesting project. I think you should continuosly check and compare the value from the adc with your reference value.

 

Are you using timers for generating PWM or simply delay waiting inside a continuous loop?

 

Anyway, there should be a condition check for same adc value and reference value. If the condition fails, you should update the number of counts required in timer ISR or the delay required in the code (increase or decerease depending whether the adc value is lesser or greater than the reference).

 

Hope you got some idea.

[Author]

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