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cheap solution on AC power regulator

cheap solution on AC power regulator

(OP)
Hello everyone,

The unregulated output AC power is from 22VAC to 30VAC, 2.5A max, but the input voltage range of the load is 22VAC~28VAC, load may demage when the power is over 28VAC.

Also, there is a motor inside the load and the motor is remote controlled, when it works, the un-regulated output voltage may drop to 28VAC, but it will go back to 30VAC when the motor stops.

Is there any way I can control the output voltage always safe---that means, when it's 30VAC, I can reduce it to 28VAC. When it's already 22VAC, don't do anything.

Thanks

Mike  

RE: cheap solution on AC power regulator

A crummy way would be to provide enough load to always keep the output below 28V perhaps a resistor.  (Horrible waste of energy.)

Or replace the transformer with one that has better regulation.

Or add an appropriate autotransformer to shave off the 2V without a lot of power loss.

Or buy the correct supply.

Keith Cress
kcress - http://www.flaminsystems.com

RE: cheap solution on AC power regulator

(OP)
autotransformer to shave off the 2V without a lot of power loss is good.

would you pls explain it in detail?

RE: cheap solution on AC power regulator

http://en.wikipedia.org/wiki/Autotransformer

Note that a normal transformer has to pass all the energy thru a magnetic structure. This makes a standard (fully isolated) transformer a certain size.  An auto transformer provides no isolation what-so-ever but this results in only a fraction of the power needing to pass thru a magnetic structure.  This allows them to be dramatically smaller than their counterparts.  Since you only need a 2V adjustment no isolation is probably needed.

Keith Cress
kcress - http://www.flaminsystems.com

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