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SOLDER-FREE PRINTED CIRCUIT MOUNTABLE TRANSFORMER

IP.com Disclosure Number: IPCOM000042659D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Maroon, RP: AUTHOR [+2]

Abstract

Described is a printed circuit mountable transformer that requires no soldering during assembly or mounting. The transformer, as diagrammed in Figs. 1 and 2, is primarily intended for use in a high frequency (100 KHz to 500 KHz) switching power supply. A primary winding of insulated copper tape is wound on a molded plastic bobbin with leads exiting from the bobbin on the lower side. Each lead of the primary has a clearance hole to accept an eyelet which secures the lead ends to a header to provide primary terminals. If an electrostatic shield is needed, it is wound over the primary on the plastic bobbin and is terminated by a lead having a clearance hole which accepts an eyelet. The eyelet is used to secure the shield lead to the header at a position between the two primary terminals.

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SOLDER-FREE PRINTED CIRCUIT MOUNTABLE TRANSFORMER

Described is a printed circuit mountable transformer that requires no soldering during assembly or mounting. The transformer, as diagrammed in Figs. 1 and 2, is primarily intended for use in a high frequency (100 KHz to 500 KHz) switching power supply. A primary winding of insulated copper tape is wound on a molded plastic bobbin with leads exiting from the bobbin on the lower side. Each lead of the primary has a clearance hole to accept an eyelet which secures the lead ends to a header to provide primary terminals. If an electrostatic shield is needed, it is wound over the primary on the plastic bobbin and is terminated by a lead having a clearance hole which accepts an eyelet. The eyelet is used to secure the shield lead to the header at a position between the two primary terminals. The secondary windings are stamped and formed from copper sheet or SOLDER-FREE PRINTED CIRCUIT MOUNTABLE TRANSFORMER - Continued foil. Each winding can be a single turn or one/half of a turn enclosing the molded bobbin carrying the primary and shield. The ends of the secondary have clearance holes which accept eyelets for attaching the secondary terminals to the header. The ends of the secondary winding are separated by insulators which prevent short circuiting. The final assembly appears in Fig. 2 and includes two halves of an E-type magnetic material core for completion of the transformer. The eyelets serve to secure the leads to t...