RE: [CAD_CAM_EDM_DRO] Re: CNC power supply question

What is the advantage to the bleeder capacitor, aside form avoiding shocks
while working on the circuit?

Andy Wander
Verrex Corporation

-----Original Message-----
From: bull2002winkle [mailto:bull2002winkle@...]
Sent: Monday, March 08, 2004 1:39 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: CNC power supply question

The only thing I have not seen that you may want is a bleeder resistor
across your filter capacitor to discharge it when power is turned off.
The ideal value will depend on the voltage of your supply and the
capacitance of the capacitor. A 500 ohm 10 watt resistor is a good
start. There have been many posts about how to pick the right size
bleeder but this will get you close.

Ken

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "snagglexr650"
<snaggletto@c...> wrote:

> Hey,
> Thanks for the great, informative replies. I'm learning alot, but
> still have tons more to learn, especially on the electrical side.
>
> I've been looking at some of the extra 'features' you can add to
> homemade PS's. For example, Mariss's capacitor bleed circuit, and
> I've seen precharge circuits that limit the initial current when the
> PS is first powered on like Mr. Fortune uses on his 1kw/1.5kw
> monsters. These added features seem like they could almost be
> considered essential even for smaller/less powerful supplies. What
> other safety/component protection circuits are common for a full
> featured power supply?
>

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