stuartiannaylor
Newbie level 5
I am suffering from designers block (lol).
I have a led driver circuit that runs on a 12Vac supply.
It accepts also a PWM dimming input.
My aim is to keep to a two wire supply system:-
My first thought was that I could have a 12VAC supply and modulate a 100hz PWM signal over the power line.
The idea was with a couple of simple passive components I could filter the powerline and recieve a demodulated 100hz PWM control signal.
Then I began to think of the problems of backward compatibilty and the use of third party transformers. Most HF electronic transformers work in a region of 10khz to 30khz and could confuse the control signal.
I have thought about data packets at the zero crossover of the AC supply but that would involve further microcontroller complexity which exceeds the design budget.
Before I rattle on I would like to here your thoughts LV lighting circuits.
Any gems on trailing edge dimming and control compatibility would be of much interest.
I have a led driver circuit that runs on a 12Vac supply.
It accepts also a PWM dimming input.
My aim is to keep to a two wire supply system:-
My first thought was that I could have a 12VAC supply and modulate a 100hz PWM signal over the power line.
The idea was with a couple of simple passive components I could filter the powerline and recieve a demodulated 100hz PWM control signal.
Then I began to think of the problems of backward compatibilty and the use of third party transformers. Most HF electronic transformers work in a region of 10khz to 30khz and could confuse the control signal.
I have thought about data packets at the zero crossover of the AC supply but that would involve further microcontroller complexity which exceeds the design budget.
Before I rattle on I would like to here your thoughts LV lighting circuits.
Any gems on trailing edge dimming and control compatibility would be of much interest.
