Appeal No. 1998-1408 Page 2
Application No. 08/569,529
isolation, impedance matching, or voltage transformations are
required.
Known transformers comprise a ferrite core and primary and
secondary windings wrapped around the core. Typically, the
shape of the core is torroidal. The primary and secondary
windings are wrapped around the sidewalls of the core and
either interlaced with each other or wrapped around separate
sections of the core.
A transformer formed with a printed circuit board (PCB)
is also known. Specifically, the transformer’s core is
mounted onto the PCB. Underneath the core, elongated
conductors printed thereon form segments of respective
windings. Metallic wires are contoured over the top and two
sides of the core, and are wire- bonded to ends of respective
printed conductors to form continuous strings of primary and
secondary windings, which surround the core. While this
arrangement offers a low profile and incorporation with a PCB,
its cost of construction is high.
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007