Coupling of carrier signal from power line

Patent · Tue Jun 23 04:00:00 EDT 1987

OSTI ID:6435767

Hardy, J H; Owen, D V; Willis, C A

A circuit is described coupling an RF carrier signal into a signal utilization circuit from an AC power line supplying an electric discharge lamp circuit including ballast means for limiting the current through the lamp. It comprises: an inductive device having a high current capacity winding coupled to the power line and connected in series with at least a portion of the electric discharge lamp circuit. The inductive device develops across its winding a signal proportionate to the RF signal, the inductive device presents a low capacitive impedance to the RF carrier signal; resistive means coupled to the inductive device causing it to present to the power line a terminating impedance higher than the characteristic impedance of the power line. The terminating impedance has a value selected so that a minimum or threshold voltage appears at any point along the power line of a sufficient value to assure development by the inductive device of the signal proportionate to the RF carrier signal; and means coupling the proportionate RF carrier signal developed across the inductive device into the signal utilization circuit.

• Assignee: General Electric Co., Schenectady, NY
• Patent Number(s): US 4675579
• OSTI ID: 6435767
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
ALTERNATING CURRENT
BALLASTS
CAPACITANCE
CURRENT LIMITERS
CURRENTS
DATA TRANSMISSION SYSTEMS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC IMPEDANCE
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
EQUIPMENT
IMPEDANCE
LIGHT BULBS
PHYSICAL PROPERTIES
POWER TRANSMISSION LINES
RF SYSTEMS
SIGNALS