Hello.
First of all sorry for my poor english.
I made a switching power supply but I don't know why it doesn't work.
Actually 13007 doesn't switch at all. my circuit is the same as below pic.
Any help.
Thanks.
I have no idea, but you're a braver man than I having mains power connected directly like that.
Graynomad:
I have no idea, but you're a braver man than I having mains power connected directly like that.
The circuit is completely isolated, EE19 is a transformer.
The circuit doesnt appear to have any way of starting, and theres no feedback from the secondary output voltage so there wont be any regulation.
Actually I think there is the feedback.
I didn't take it from the output, I took feedback from another winding of transformer.
Have you designed switchmode power supplies before?
Thought not. - they're not easy.
I don't see how the crcuit oscillates, or any means of power control. Or any EMI filtering.
There are many chip suppliers who provide excellent iintegrated solutions for such designs - far better
than you can knock up with a few discretes, and I suggest you look at LT, Maxim, Texas, National etc
etc .They also provide recommended layouts and parts lists. You can't lash up such gadgets on a breadboard - it has to be a proper PCB.
Or take life easy - you can buy pre-made modules to pretty much any spec you like cheaply
from many suppliers - and they'll be properly built and tested.
regards
Allan.
This question shouldn't even be asked on this forum, since it's not Arduino related.
And playing with 220AC is dangerous for newbies.
Some questions though.
Why are both parts of the current sense circuit (R7, Q2) shorted.
Did you connect the transformer with the right polarity.
A SOPS (Self Oscillating Power Supply) won't work if the feedback winding is connected out of phase.
Leo..