Daniel W Jefferies

US Patent:

50848682, Jan 28, 1992

Filed:

May 13, 1988

Appl. No.:

7/193698

Inventors:

Thomas F. Kelly - Washington DC
Eric H. Naviasky - Baltimore MD
Daniel W. Jefferies - Glen Burnie MD
William P. Evans - Glen Burnie MD
John R. Smith - Monroeville PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H04J 102
H04J 100

US Classification:

370 691

Abstract:

The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the coaxial cable and through an isolation transformer converts the alternating current power to direct current power for an integrated circuit bus interface. The interface is connected to the sensors. The interface is externally pin programmable to provide a carrier at a frequency for a channel assigned to the remote unit. The carrier is provided by a ripple counter producing a frequency divided signal compared to a fixed reference frequency, where the result of the comparison controls a voltage controlled oscillator. When plural low frequency analog signals are to be transmitted over the common bus, an on-chip multiplexer multiplexes the signals to an off-chip, external analog-to-digital converter. The analog-to-digital converter loads an on chip parallel to serial register that applies each bit of the sampled signal serially to an on chip Manchester encoder.

US Patent:

54264162, Jun 20, 1995

Filed:

Oct 19, 1992

Appl. No.:

7/963711

Inventors:

Daniel W. Jefferies - Glen Burnie MD
Eric H. Naviasky - Baltimore MD
Donald J. Grone - Finksburg MD
Joseph G. Henderson - Timonium MD

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

G08B 2100

US Classification:

340664

Abstract:

A high-amperage current sensor is disclosed which is suitable for use in an automotive electrical system and which is operatively unaffected by changes in ambient temperature. The current sensor utilizes a shunt assembly having at least one low-resistance shunt element connectable in line between a source of electrical energy and a load. Circuitry preferably configured on an application specific integrated circuit measures voltage drop across the shunt element due to current flow. As a result, an output signal is produced which may be fed to external circuitry for further processing. In presently preferred embodiments, the sensor may comprise analog circuitry producing an analog output signal and/or digital circuitry producing a digital output signal.

US Patent:

47708425, Sep 13, 1988

Filed:

Nov 20, 1986

Appl. No.:

6/934238

Inventors:

Thomas F. Kelly - Washington DC
Eric H. Naviasky - Baltimore MD
Daniel W. Jefferies - Glen Burnie MD
William P. Evans - Glen Burnie MD
John R. Smith - Monroeville PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G21C 736

US Classification:

376216

Abstract:

The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the coaxial cable and through an isolation transformer converts the alternating current power to direct current power for an integrated circuit bus interface. The interface is connected to the sensors. The interface is externally pin programmable to provide a carrier at a frequency for a channel assigned to the remote unit. The carrier is provided by a ripple counter producing a frequency divided signal compared to a fixed reference frequency, where the result of the comparison controls a voltage controlled oscillator. When plural low frequency analog signals are to be transmitted over the common bus, an on-chip multiplexer multiplexes the signals to an off-chip, external analog-to-digital converter. The analog-to-digital converter loads an on chip parallel to serial register that applies each bit of the sampled signal serially to an on chip Manchester encoder.