[Boatanchors] Re: GB> Solid State Relay Question

[Scott Johnson]

Most microwaves don't have a SSR per se, it is usually a 25A triac, a 
SSR has integrated logic that is opto-isolated from the output, and are 
usually driven with a 3-32VDC signal, or sometimes a higher voltage AC 
signal.
To answer the original question, I have used phase control on the input 
of plate transfgormers with success, but it generally requires the use 
of a series choke to quench the noise.  A strait SSR will work FB for 
controlling a plate transformer, and they are quite inexpensive on the 
surplus market.  I have lots of 240V 25 A SSRs  if you need one.

73,
Scott W7SVJ

Richard Post wrote:
> Hi Greg,
>
> Such relays are commonly used in microwave ovens which cycle the final 
> power to the main transformer for reduced cooking levels such as 
> defrost. (You can see the action when the timer kicks in full power 
> for a few seconds at a time by noting the slightly reduced light from 
> the oven light bulb each time the circuit is loaded.)
>
> A dead microwave oven may provide all the recycled pieces with enough 
> capacity needed for your circuit.
>
> Rich KB8TAD
>
> Boatanchor pix
>
> <http://tinyurl.com/hexco>
>
>
> At 11:01 AM -0500 11/22/07, Greg wrote:
>> 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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