I've been trying, unsuccessfully, to dim a 60W indascent lightbulb with two back to back mosfets similar as in this post: http://easy-electronics4u.blogspot.se/2012/02/switch-ac-loads-using-mosfets-as-relay.html
My circuit looks like this:
(there is also a 2A fast blow fuse and a 7D471K MOV on the mains input)
Below is the output from my scope:
C1: Live_230VAC, C2: DIM_GPIO, C3: Drain of Q5, C4: Source of Q5 and Q6
Q6 gets burning hot, Q5 stays cool. The lamp (obviously) flickers as we are only getting every other half wave. Thinking about the circuit I feel that it will be impossible to get a Vgs voltage that is higher than the voltage at the source pin since the source pin will see the peak of the 230VAC? Is there a way (preferably simple & cheap ) of solving this kind of double mosfet dimmer?
My circuit looks like this:
(there is also a 2A fast blow fuse and a 7D471K MOV on the mains input)
Below is the output from my scope:
C1: Live_230VAC, C2: DIM_GPIO, C3: Drain of Q5, C4: Source of Q5 and Q6
Q6 gets burning hot, Q5 stays cool. The lamp (obviously) flickers as we are only getting every other half wave. Thinking about the circuit I feel that it will be impossible to get a Vgs voltage that is higher than the voltage at the source pin since the source pin will see the peak of the 230VAC? Is there a way (preferably simple & cheap ) of solving this kind of double mosfet dimmer?