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'[EE] switching power supplies'
2007\03\15@003801 by Cristóvão Dalla Costa

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Hello everyone, I'm designing two switching supplies and I need your help.

First is an 1,5 A, 0-45 V supply for an electromagnetic brake with 100-250 V
input. I did simulations and everything seems fine with a MOSFET switching
directly into the coils which provides enough inductance and resistance to
filter the output with a 100nF parallel capacitor. I'm looking into 100 kHz
PWM input to the MOSFET and there won't be any actual voltage regulation, I
shall use a PIC running a PID loop on feedback from a load cell to maintain
desired torque varying the current flow.

I have a couple questions though for the more experienced people: should I
filter the input voltage or is the raw rectified input OK? How would you
drive the MOSFET from the PIC? Also, I used an IRF730 for simulations, would
anyone say it's not a good choice (or have a better recommendation)?

Second is an 8 V (fixed), 15 A supply for a bunch of big 7 segment displays.
Due to the high current I'm also looking into a transformerless supply
(100-250V input). Does anyone know of a regulator that will do the job?
There are endless parts on newark and digikey and I could spend eternity to
find one...

Thanks in advance.

Cristovao.

2007\03\15@051435 by Vasile Surducan

face picon face
On 3/15/07, Cristóvão Dalla Costa <spam_OUTcdallacostaTakeThisOuTspamgmail.com> wrote:

> Second is an 8 V (fixed), 15 A supply for a bunch of big 7 segment displays.
> Due to the high current I'm also looking into a transformerless supply
> (100-250V input). Does anyone know of a regulator that will do the job?

I have used standard PC power supply (less expensive) . It's quite
easy to modify  the +12V supply to +8V (if you have some experience).
But I think it's much better to split the 15A supply in three or four
smaller modules, this will help you a lot with cable routing.

Vasile

2007\03\15@090131 by Cristóvão Dalla Costa

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On 3/15/07, Vasile Surducan <.....piclist9KILLspamspam@spam@gmail.com> wrote:
>
> On 3/15/07, Cristóvão Dalla Costa <cdallacostaspamKILLspamgmail.com> wrote:
>
> > Second is an 8 V (fixed), 15 A supply for a bunch of big 7 segment
> displays.
> > Due to the high current I'm also looking into a transformerless supply
> > (100-250V input). Does anyone know of a regulator that will do the job?
>
> I have used standard PC power supply (less expensive) . It's quite
> easy to modify  the +12V supply to +8V (if you have some experience).
> But I think it's much better to split the 15A supply in three or four
> smaller modules, this will help you a lot with cable routing.
>
> Vasile



Thanks, but these will be manufactured in quantities of 50 or so initialy,
I'm not sure that would be a feasible option.

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