Re: Bleeder resistor for power supply size?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
<mariss92705@y...> wrote:

> Hi,
>
> This is one of those "how many angels can dace on the end of a pin"
> questions that come up again and again.
>
> A capacitor stores a charge (voltage) for a long time if there is

no

> load on it.
>
> That is not the way you are going to use your supply.
>
> You will have various drives and other loads on it and you will

turn

> the supply on and off on the AC input to your supply.
>
> With all these various drives and loads, your supply will very
> quickly discharge (<< 1 sec) when you shut off the AC supply.
>
> You never switch the loads on and off on the DC side. That is hard

on

> the switch and any electronics attached to it. You use the AC power
> input for that.
>
> You do that and there is no reason for a "bleeder resistor". It is

a

> pointless, sometimes expensive component that does precisely

nothing

> except get hot.
>
> Long and short, turn your power on-off at the AC side and let your
> drives be the "bleeders". They will do a better job than any

resistor

> and they will do it quicker and better for free.
>
> Mariss

I think of all the solutions, I liked the fans in series one. just
get a few cooling fans in series to be higher than the DC bus and if
you hear them running, you got power.

Dave