[Boatanchors] Solid State Relay Question

[Meir WF2U]

Greg,

A solid-state relay is a good way to turn power supplies on and off. For
many years I made my living as an EE designing high-power RF amplifiers -
both solid-state and tube - for industrial use, and utilized these relays.
Using a so-called "zero crossing" solid state relay is the best way to
prevent surge current and voltage spikes when turning on the supply, as such
a relay turns on when the AC cycle is at zero, and the voltage ramps up as
the sine wave rises.
For real "soft start", you can buy the soft start modules with the relay,
and that'll really turn things on slowly and gently...
All that and no arcing in the contacts like in the electromagnetic relays!

73, Meir WF2U
Landrum, SC

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Greg
Sent: Thursday, November 22, 2007 11:02 AM
To: boatanchors at mailman.qth.net
Cc: glowbugs at piobaire.mines.uidaho.edu
Subject: [Boatanchors] Solid State Relay Question

Hi:
I got a question about power supply design.
Has anyone used a modern solid state relay in series with the primary
winding to control the AC power to a conventional power transformer working
as a plate power supply?
Tnx and Happy Holiday to all
Greg
WA7LYO
Kinston NC

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