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Re: [Amps] Zero Crossing power switch?

To: "Gene Bigham" <jbigham2@kc.rr.com>
Subject: Re: [Amps] Zero Crossing power switch?
From: Bill Turner <wrt@dslextreme.com>
Reply-to: wrt@dslextreme.com
Date: Sat, 08 Nov 2003 06:27:59 -0800
List-post: <mailto:amps@contesting.com>
On Fri, 7 Nov 2003 11:03:56 -0600, "Gene Bigham" <jbigham2@kc.rr.com>
wrote:

>What is a zero crossing power switch?

_________________________________________________________

It is a switch that senses when the voltage crosses the zero point in
the AC cycle and makes the connection at that instant, thereby
reducing the initial current surge.  

There is a current-sensing variation that turns off the power when the
current crosses the zero point.  In a reactive circuit, the voltage
zero and current zero occur at different times, thus the need for
different sensors.

-- 
Bill, W7TI

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