Transformer having fractional turn windings

Details Transformer having fractional turn windings Transformer having fractional turn windings

2001-05-03

2002-02-19

Donovan, Lincoln (Department: 2832)

Inductor devices

With closed core interrupted by an air gap

C336S212000, C323S308000

Reexamination Certificate

active

06348848

ABSTRACT:

This invention relates to transformers, especially to transformers in which it is desired to have particular ratios of input voltage to one or more output voltages. This ratio is usually determined by the relative number of turns, or “turns ratio” of the various windings of the transformer, but in prior art transformers this is restricted to whole number ratios.
As the operating frequency of transformers increases, and the operating voltage decreases, single turn windings, or windings having only a few turns, are becoming more and more common. With a large number of turns, it is fairly easy to get an arbitrary ratio of the input to the outputs, such as 127 to 13 to 7.
With a single turn secondary, there are large gaps between the available ratios using whole numbered turns. As an example, there is a big difference between a 4 to 1 and a 3 to 1 turns ratio, but nothing in between is commonly available. There is some prior art teaching half turn windings. U.S. Pat. No. 5,999,078, Herbert, teaches a transformer module with a “half turn” secondary. U.S. Pat. No. 3,768,055, Oliver, also teaches a “half turn” secondary winding. U.S. Pat. No. 6,137,392, Herbert, has embodiments having a “half turn” secondary winding.
OBJECT OF THE INVENTION
It is an object of the present invention to be able to use intermediate fractional turns, for example 6.3 to 3.7 to 1. A flux distribution winding can be added to two or more parallel legs of a transformer to apportion the flux among them. A winding on a particular leg with a portion of the total flux will have an equivalent winding which is a fraction proportional to portion of the flux.


REFERENCES:
patent: 4766365 (1988-08-01), Bolduc et al.
patent: 5335163 (1994-08-01), Seiersen

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