A product's cooling fan was rated only for 115 VAC service in a product that needed to switch between 115 VAC and 230 VAC. To accomplish this, I made the product's power transformer serve the fan as an autotransformer when 230V service was called for:
At the lower line voltage, the fan was simply driven right from the line. At the higher line voltage, the fan acted as a load on the transformer's primary coils which served just fine as an autotransformer.
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John,
Good solution but not very new. It has been done for many years on lots of products - e.g. large RF amplifiers (large = in the KW or multi-KW area.
Bob Groh
EE (Retired)
Posted by: Bob Groh | November 21, 2010 at 05:21 PM
Hi John -I would like to feature this in EE Times as an interesting example of engineering ingenuity.
Posted by: Karen Field | December 21, 2010 at 09:30 PM
Good this is possible by using auto transformer
Posted by: Hanmantrao Makthal | July 22, 2013 at 01:03 PM