POWER SUPPLY FO POWER LINE CARRIER COMMUNICATION SYSTEMS

摘要

POWER SUPPLY FOR POWER LINE CARRIER COMMUNICATION SYSTEMS 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 aircore 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 highvoltage 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.