Current Limiting

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Current Limiting
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Fri, 30 Jan 1998 16:56:55 -0600
• Approved: tesla-at-stic-dot-net

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From:  Greg Leyh [SMTP:lod-at-pacbell-dot-net]
Sent:  Friday, January 30, 1998 7:17 AM
To:  Tesla List
Subject:  Re: Current Limiting

Michael Baumann wrote:

> Power control is two fold: Voltage via variac, and current by switching
> in more or less bulbs in series.
> 
> Like So  (god I hate ascii art)
> 
> HOT--------------------------------------------
>         |         |          |         |       |
>         B         B          B         B       B       B=lightbulb
>         |         |          |         |       |       S= Switch
> VARIAC  S         S          S         S       S
>         |         |          |         |       |
>         ----------------------------------------------
>                                                       Pig
> NEU---------------------------------------------------
> 
> So. it's stupidly simple. Despite the engineering approach of KISS,
> there must be someting wrong - else it would be used. So someone please
> exlain where my logic went off the deep end.

Your scheme will work, but why limit the current by dissipating
the extra power?  Replacing the bulbs with inductive elements 
would be far more efficient.  Your inductor values could follow
a 'power of two' series, providing 5 bits of current resolution.


-GL

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