Hi,
I have this circuit found on the web, its used for reverse phase dimming.
I have worked quite a lot with trailing edge dimming and know exactly what im doing with the mains etc.
However this circuit has me a bit stumped.
I can see how the Mosfet is switched ona nd off and i can see how the mains will create the zero crossing signal using the opto. The 2 parts i am puzzled with is why the rectifier is used (how does it work in this insance) and what is the circuitry at the top doing ?
Also one last question, in a circuit such as this is it adviseable to isolate the mosfet using an opto in much the same way as you would using a triac?
Can anyone explain for me please?
Here is the schematic.
View attachment 68709
I have just looked at this picture and all the values are missing from it. Here is a link to the site if you need it. I am looking at option 2 schematic.
http://www.dz863.com/circuits-6-832...-Phase-Dimmer-Option-2-Application-Schematic/
I have this circuit found on the web, its used for reverse phase dimming.
I have worked quite a lot with trailing edge dimming and know exactly what im doing with the mains etc.
However this circuit has me a bit stumped.
I can see how the Mosfet is switched ona nd off and i can see how the mains will create the zero crossing signal using the opto. The 2 parts i am puzzled with is why the rectifier is used (how does it work in this insance) and what is the circuitry at the top doing ?
Also one last question, in a circuit such as this is it adviseable to isolate the mosfet using an opto in much the same way as you would using a triac?
Can anyone explain for me please?
Here is the schematic.
View attachment 68709
I have just looked at this picture and all the values are missing from it. Here is a link to the site if you need it. I am looking at option 2 schematic.
http://www.dz863.com/circuits-6-832...-Phase-Dimmer-Option-2-Application-Schematic/
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