Browse Prior Art Database

Etched Transformer

IP.com Disclosure Number: IPCOM000095204D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Crawford, DJ: AUTHOR [+6]

Abstract

High-frequency characteristics of a printed transformer are enhanced by the presence of ferrite material positioned adjacent the primary winding. The etched, high-frequency printed transformer is made up of dielectric base 1 which can be polyester sheet material. Upon the two sides of base 1, primary winding pattern 2 and secondary winding pattern 3 are selectedly etched from covering copper sheets. Ferrite material 4, adjacent the primary 2 side, completes the device.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Etched Transformer

High-frequency characteristics of a printed transformer are enhanced by the presence of ferrite material positioned adjacent the primary winding. The etched, high-frequency printed transformer is made up of dielectric base 1 which can be polyester sheet material. Upon the two sides of base 1, primary winding pattern 2 and secondary winding pattern 3 are selectedly etched from covering copper sheets. Ferrite material 4, adjacent the primary 2 side, completes the device.

Ferrite material 4 adjacent primary 2 enhances high-frequency performance. Where fast-rising primary pulses are used, the requirement of increased inductive coupling between primary and secondary windings 2 and 3 indicates the need for magnetic material about the transformer windings. It is not acceptable to add magnetic material on the secondary side of the transformer. Any improvement in inductive coupling brought about by the magnetic material adjacent the secondary is offset by the increased self-inductance of the secondary. The addition of ferrite material 4, adjacent the primary, substantially improves the primary-secondary coupling but only slightly raises the self- inductance of the secondary.

Positioning magnetic material adjacent the primary of an etched printed transformer thus significantly enhances operation by increasing the ratio of inductive coupling to output self-inductance.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]