Plastic quad-packaged switched-mode integrated circuit with integrated transformer windings and mouldings for transformer core pieces
US5469334A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | May 20, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S257/924
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply embodiment of the present invention includes a plastic leaded chip carrier (PLCC) that has two rectangular holes joined by a channel on the bottom surface that allow the PLCC to be surface mounted on a printed circuit board over a ferrite U-core section. A ferrite I-core section caps the ends of the U-core section above the top surface of the PLCC. A wire frame within the PLCC provides for several individual parallel conductor segments that pass between the two holes to rows of surface mount pins on opposite edges of the PLCC. Traces on the printed circuit board complete the connection of these conductor segments to form a primary winding of a transformer. A secondary winding is similarly constructed using pins on another edge of the PLCC. A switched mode power supply integrated circuit chip is molded directly into the body of the PLCC nearer the primary winding conductor and chops current flowing in the primary winding according to a voltage derived from the current that results in the secondary winding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.