Inductive coupling system for power and data transfer

Patent 5455466 Issued on October 3, 1995. Estimated Expiration Date:

July 29, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Inductive power coupling with constant voltage output
Patent #: 4800328
Issued on: 01/24/1989
Inventor: Bolger , et al.

Identification system
Patent #: 4818855
Issued on: 04/04/1989
Inventor: Mongeon , et al.

House arrest monitoring system
Patent #: 4918432
Issued on: 04/17/1990
Inventor: Pauley, et al.

Identification system
Patent #: 5041826
Issued on: 08/20/1991
Inventor: Milheiser

Non-contact data and power connector for computer based modules
Patent #: 5229652
Issued on: 07/20/1993
Inventor: Hough

Data altering means for multi-memory electronic identification tag Patent #: 5257011
Issued on: 10/26/1993
Inventor: Beigel

Inventors

Assignee

Dell USA, L.P.

Application

No. 098683 filed on 07/29/1993

US Classes:

307/104, ELECTROMAGNET OR HIGHLY INDUCTIVE SYSTEMS340/10.34Power up

Examiners

Primary: Wong, Peter S.
Assistant: Krishnan, Aditya

Attorney, Agent or Firm

McCombs; David, Huffman; James, Hitt; David

International Class

H04Q 001/18

Abstract

A system for inductively coupling power and data to a portable electronic device. A portable device, such as a personal digital assistant, is powered or recharged via an inductive link between the device and a support unit, thereby eliminating the need for cabling or other connections therebetween. The same inductive link is also used to transfer data signals between the device and a second electronic device, for example, a conventional desktop computer. The support unit includes a primary winding of a transformer, a power amplifier and a modulator. The portable device includes a secondary winding connected in parallel with the input of a rectifier, the output of which is connected to a battery charging circuit, and to a modem, which is further connected to the device microprocessor. Placement of the device on the support unit effects the inductive coupling when the primary and secondary windings are in proximity to one another.