hey guy...actually i had do this project before..but i named it powe factor corrector..i think it same with what you want.bt now i can't find da circuit that i draw before..but i can tell you the theory la..
1st use a hall effect current transducer/current transformer to measure ac current from voltage source...then use a comparator/schmitt trigger to change both voltage and current signal from sine wave to pulse wave...so now use a XOR gate to XOR the two voltage and current pulse wave...so you can get the phase different of voltage and current...so now built a pulse wave generator using 555 timer...pulse width around 10ms..depend on you..so AND the signal of 555timer and phase difference from XOR gate...so you can get a pulse wave that represent how much degree of phase difference,(for my project is 1 pulse = 10degree), so now need use a counter that able to count how many pulse in an intrval ( 100ms for my project ).then use the signal from counter to select relay to switch on which capacitor that you want to use...
actually i just built up my 1st prototype then i stop it already...my 1st prototype can funtion but not so nice..hope the infomation i give can help you...and i wil upload the schmetic that i drawn when i find it bc...all the best...(i use 1 month to do this)
switch capacitors accordingly with microcontroller or something.He told me he'll use the Current transformer for that. The load would be made by the autotransformer, those guys purchased the autotransformer working from line frequency. He said, it's kind of dummy inductive load for that. In short, the purpose is that when the inductive load on the line increases, the capacitors get connected on the line with relays.He also said they'll also have a zero cross detector
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