Gulton Industries Inc., Femco Division

Northrop Grumman Systems Corporation

Tyco Electronics Corporation

Edwin G Cox

David T Ritter

Lyle Stanley Bryan

Jeremy Christin Patterson

James W Blair

Kristy M Grant

A system and method are disclosed for providing a high efficiency bypass circuit for multi-stage direct current to direct current (DC-DC) converters used in battery powered systems. When the system is operating in a battery mode, the vehicle power source is unplugged from the power supply input connector and the external battery is connected in its place. The system uses a relay to bypass the flyback converter so as to connect the boost converter output directly to the output terminals. The system uses a single control signal to: 1) energize the relay connecting the boost converter output directly to the output terminals, 2) adjust the boost converter circuit to cause the boost converter to deliver a voltage equal to what the flyback converter would have delivered, and 3) disable the flyback converter.

System and method for providing a high efficiency bypass circuit for multi-stage DC-DC converters used in battery powered systems

An electrical connector and methods for minimizing arcing when the connector is connected or disconnected under load are disclosed. The invention provides an arc reduction circuit with one or more regulators, such as transistors, integrated into the connector housing that sense movement of the connector and shunt the current to an impedance circuit when a potential arc condition is sensed.

Apparatus, methods and articles of manufacture to minimize arcing in electrical connectors

A field telephone system having a widely dispersed set of telephone lines including a page line pair and a party line pair, audio processing equipment including telephone handsets, handset amplifiers, receiver amplifiers and paging speaker amplifiers is designed to have improved voice transmission by provision of a narrow band FM carrier system. The FM carrier system includes a device for generating a carrier frequency signal, a modulator for modulating the carrier frequency with an audio signal derived from one of the handsets at a transmitting station and circuitry for transmitting the modulated signal over a line pair to a receiving station. The receiving station includes circuitry responsive to the transmitted signal and the carrier frequency signal for extracting the audio component of the transmitted signal and for processing the extracted audio signal and for providing the processed audio signal to a handset at the receiving station. A frequency mixing arrangement is utilized to provide a low distortion carrier signal since the system otherwise prevents the use of ordinary filtering techniques.

Field telephone system

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Jamestown, NC, United States of America

Edwin G Cox