Hello
I have a PIC18F2420 running at 20MHz ceramic. Compiler used is C18.
I have successfully developed a PIC controlled 2 channel AC (230V/50Hz) Halogen lamp dimmer via transformer coupled. I use an opto (MOC3020) and TRIAC BTB16600BW (snubberless) to control my lamps via the PIC. For the dimming the PIC controls the phase angle on 230V AC on each channel independently. The PIC dimmer works great and I have no exccessive heating issues either. I can control the dimming of Electronic and Simple transformer such as.....
1) Halogen lamps via simple transfromer coupled (230/12)
2) Halogen lamps via Electronic transformers (dimmable by leading or trailing edge)....(230/12)
I can have the following connection arrangement on each of the channels and the PIC dimmer works perfectly.....
1) Simple transformer on CH1 and Electronic transformer on CH2
2) Electronic transformer on CH1 and Simple transformer on CH2
3) Simple transformer on CH1 and Simple transformer on CH2
4) Only CH1 in operation with Electronic or Simple transformer
5) Only CH2 in operation with Electronic or Simple transformer
.....BUT there is one problem.
If I connect two electronic transformers on each channel, then thats where I seem to be getting unstable dimming performance and my Halogen lamps flicker. It happens when any one channel is start to dimmed and has effect on the other channel.
Please can someone help me to solve this mystry?
Haseeb
I have a PIC18F2420 running at 20MHz ceramic. Compiler used is C18.
I have successfully developed a PIC controlled 2 channel AC (230V/50Hz) Halogen lamp dimmer via transformer coupled. I use an opto (MOC3020) and TRIAC BTB16600BW (snubberless) to control my lamps via the PIC. For the dimming the PIC controls the phase angle on 230V AC on each channel independently. The PIC dimmer works great and I have no exccessive heating issues either. I can control the dimming of Electronic and Simple transformer such as.....
1) Halogen lamps via simple transfromer coupled (230/12)
2) Halogen lamps via Electronic transformers (dimmable by leading or trailing edge)....(230/12)
I can have the following connection arrangement on each of the channels and the PIC dimmer works perfectly.....
1) Simple transformer on CH1 and Electronic transformer on CH2
2) Electronic transformer on CH1 and Simple transformer on CH2
3) Simple transformer on CH1 and Simple transformer on CH2
4) Only CH1 in operation with Electronic or Simple transformer
5) Only CH2 in operation with Electronic or Simple transformer
.....BUT there is one problem.
If I connect two electronic transformers on each channel, then thats where I seem to be getting unstable dimming performance and my Halogen lamps flicker. It happens when any one channel is start to dimmed and has effect on the other channel.
Please can someone help me to solve this mystry?
Haseeb