Isolation transformer for medical equipment

Details Isolation transformer for medical equipment Isolation transformer for medical equipment

1995-10-11

1997-03-25

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

336198, H02M 3337, H01F 2734

Patent

active

056150911

ABSTRACT:
A power supply has a transformer for isolating circuitry to which power is furnished from the electrical supply lines. The transformer includes a core of ferro-magnetic material with primary and secondary windings wound side-by-side on the core. The primary winding has two layers of turns with a center tap formed at a connection of the turns of each layer that are closest to the secondary winding. Similarly, the secondary winding has two layers of turns with a center tap formed at a connection of the turns of each layer which are closest to the primary winding. A driver applies excitation voltage across the center tap, which also is coupled to earth ground, and a turn of the innermost primary winding layer. The center tap of the secondary winding is used as an isolated ground and a supply voltage is produced between two turns from different layers of the secondary winding. Because the ground connection of each winding is made a turns that are closest to the other winding, the parasitic capacitance is the greatest between those turns which minimizes any difference in potential between the earth ground and the isolated ground.

REFERENCES:
patent: 3691425 (1972-09-01), Weyrich et al.
patent: 3896407 (1975-07-01), Long
patent: 3947795 (1976-03-01), Donnelly et al.
patent: 4188574 (1980-02-01), Allington
patent: 4405913 (1983-09-01), Finkbeiner
patent: 4717889 (1988-01-01), Engelmann
patent: 5053937 (1991-10-01), Blockl

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