Communications: electrical – Aircraft alarm or indicating systems – Land-based landing guidance
Patent
1994-05-09
1997-06-10
Hofsass, Jeffery
Communications: electrical
Aircraft alarm or indicating systems
Land-based landing guidance
340953, 340642, 340931, 324500, 324509, 315130, 315125, 315126, G08G 500
Patent
active
056380577
ABSTRACT:
The present invention includes an airfield lighting and control system for energizing at least one airfield control device and containing a ground fault detection system, comprising: (1) at least one airfield control device; (2) an AC electrical circuit conducting an AC signal and connected to said at least one airfield control device; (3) an inductive device, in electrical contact with said AC electrical circuit, which comprises (a) an inductive coil having an input pole and an output pole, and being loaded by a capacitor; (b) a driver winding for the inductive coil, the driver winding adapted to sense AC current flow through the inductor coil; (c) a sampling resistor connected to the driver winding and adapted to detect AC current in the form of a voltage across the sampling resistor; (d) signal processing circuitry comprising: (1) an inverting amplifier adapted to amplify the voltage; and (2) a phase shifter adapted to shift the phase of the voltage; and (e) a power amplifier connected to the signal processing circuitry and to the driver winding.
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ADB-Alnaco, Inc.
Hofsass Jeffery
Lee Benjamin C.
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