Power supply with relay in the input that increase voltage

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Fragrance

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Hi

i have china power supply which have relay in the input that increase voltage in the input as per out put requirements can any one give idea and provide any schematic how they works as i wnat to start a pic based supply and want this feature implemented in the supply

regards
Fragrance
 

If some one know

Can U pls check if this relay switches the windings of an auto transformer used in power supply?
 

Re: If some one know

hi

yes it switch the winding of transformer

regards
Fragrance
 

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