On Nov 17, 2004, at 5:03 PM, jeff millar wrote:
Ed...
I've used zero voltage switched solid state relays twice in 2KW
amplifiers, one at 432 and one at 144 MHz. The 432 amp included the
normal step start circuit, but once I noticed that the zero voltage
switching feature, I tried it without a step start in the 144 amp.
The circuit switched on with very little drama, the lights blinked
about the same amount as when transmitting at full power.
One design note on high voltage power supplies suggested that
extremely high surge currents can damage electrolytic capacitors.
These surge current maximizes when the turn on relay or switch happens
to make contact at the peak of the line cycle. The zero voltage
switching function reduces the surge currents to approximately the
same amount as what it takes to recharge the caps at the peak of the
line cycle.
Free, unsolicited advice: Measure the peak mains-I in both situations
with an oscilloscope before assuming that this statement as valid.
...
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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