Marconi Communications Gmbh

Greenlee Textron Inc.

Edwin Glenn Yancey

Mahlon Danny Kimbrough

Paul R Siglinger

William Cory Wood

William I H Chen

William I Chen

Ewan G Browne

Wayne Jacob Chappell

Leroy S Baker

A fall of potential method of determining earth ground resistance which utilizes an earth ground tester and eliminates the need for utilizing removable ground stakes. Rather than utilizing a 'far stake' the method provides connection of the earth ground tester to the telephone wires. Rather than utilizing a 'near stake' the method provides for connection of the earth ground tester to the cable shield.

Method of testing ground resistance by making use of existing telephone lines

A load management system for monitoring the output from a power supply and managing the load on said power supply, said load management system comprising a hysteresis circuit for signaling a load element to stop drawing current when an output voltage at said output falls below a first threshold and for signaling said load element to resume drawing current when said output voltage rises above a second threshold, said hysteresis circuit comprising a first state sensing circuit having an input coupled to said output and for signaling whether said output voltage is greater than or less than said first voltage threshold, a second state sensing circuit having an input coupled to said output and for signaling whether said output voltage is greater than or less than a second voltage threshold, and a state transition circuit having a first input coupled to the output of said first state sensing circuit and a second input coupled to the output of said second state sensing circuit, said state transition circuit having an output for setting a first control signal to a first state when said output voltage falls below said first threshold and resetting said first control signal to a second state when said output voltage rises above said second threshold.

Load management system for an electrical device

A four quadrant power conversion topology comprising a multi-winding inductor, four switches, and four diodes is disclosed. The four quadrant power conversion is utilized in a number of power conversion devices such as a power efficient non-linear power amplifier that comprises the 4Q power conversion topology of the present invention and a switch-control-signal generator coupled to the 4Q power conversion topology. The switch-control-signal generator generates switch activation signals for driving the four switches of the 4Q power conversion topology. In one embodiment the switch-control-signal generator comprises a polarity detector for detecting the polarity of an input signal, a full wave rectifier for rectifying the input signal, a pulse width modulator which produces a pulse width modulated signal representative of the full wave rectified input signal, and steering logic that generates switch activation signals for driving the power conversion topology to produce an output representative of the input signal. The amplifier may optionally include switch drivers to condition the switch activation signals to drive the switches in the 4Q power conversion topology.

Four quadrant power conversion topology

Growing community of inventors

Burleson, TX, United States of America

Edwin Glenn Yancey