modified 7 years ago

mains capacitive power supply

01:16:11

Please be careful not to actually try to build this. I'm a noob trying to prototype something.

published 7 years ago

hurz

7 years ago

Super expensive. Explosion garantie. Dangerous. Huge circuit. Nothing i can see what makes sense todo

sshsslfun

7 years ago

First of all, Mains AC is not 120V peak(what you set it to), its 170V peak and 120V RMS. Second, your voltage source is shorted, its drawing 4 Amps with a load of 2.55 Amps. As that said, your diodes are likely going to melt and your NPN and Potentiometer explode. Your bridge rectifier isn't even set up properly. That capacitor on the nuetral makes no sense what so ever. Oh yea and your 10000uF Capacitor will explode. Hint hint: 2 amps and -2 Amps through it.

hurz

7 years ago

@sshsslfun, i can agree on the 170V peak and 120V rms thing, also the transistor explosion. But the rest,.... whats the problem with the 10mF cap? Why do think its shorted? The bridge rectifier looks ok to me. Diodes are available in this size. The cap at neutral iis redundant and could be replaced as short while the other 200uF will be reduced to 100uF. I think you see to many problems. This will work, except the transistor and its heat dissipation (even here it could be a very very big one with hugh heatsink) but un principal it does work for a extra high price!

hurz

7 years ago

Bigger transistor mean bigger then TO247 for maximum heat dissipation

sshsslfun

7 years ago

By shorted I mean that theres 2.5 Amps going through it. The bridge rectifier because its normally connected straight to Hot and nuetral

sshsslfun

7 years ago

Also, it draws 12.6A from the grid when mains Ac is properly configured

hurz

7 years ago

Thats normal for capacitive dropper. 100uF cause high reactive current which you do not have to pay for, but the power provider

sshsslfun

7 years ago

Im talking about the 10mF cap in the secondary side of the board. I researched online about capacitice droppers and found a 500V 100uF capacitor that was used in a capacitive powersupply for a laptop. I just dont think that the 10mF cap isn't efficient. It could be replaced by a iductor and a couple of 2.2mF or 4.7mF caps.

hurz

7 years ago

But you were talking about “explode“. efficency and price is horrible overall, no question. But you see to many things exploding which are not

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