Power supply for power line carrier communication systems

Details Power supply for power line carrier communication systems Power supply for power line carrier communication systems

1975-10-07

1977-01-18

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340310R, H04B 344

Patent

active

040041107

ABSTRACT:
Apparatus for powering a signal amplifier or repeater connected to the primary or high-voltage portion of a power distribution system. Oscillator and amplifier circuits are energized by power from the secondary or low-voltage portion of the power distribution system. The oscillator and amplifier circuits are connected to the primary winding of an air-core transformer. A capacitor is also connected to the primary winding to make the primary circuit of the air-core transformer resonant at the frequency of the oscillator. The secondary winding of the air-core transformer is connected to a resonating capacitor and to transformer and rectifier circuits which convert the AC voltage into DC voltage for powering the signal amplifier. Electrical isolation between the high-voltage and low-voltage portions of the distribution system is provided by the separation distance between the primary and secondary windings of the air-core transformer. Sufficient electrical energy is transferred between the primary and secondary windings of the air-core transformer by energizing the primary winding with a high-frequency voltage from the oscillator and amplifier circuits. The mutual inductance between the primary and secondary windings of the air-core transformer is low enough to permit reasonably efficient power transfer when the oscillator and amplifier circuits operate at high frequencies.

REFERENCES:
patent: 2153329 (1939-04-01), Jutson et al.
patent: 3435358 (1969-03-01), Rheinfelder
patent: 3459895 (1969-08-01), Ebhardt
patent: 3909560 (1975-09-01), Martin et al.

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