Method and apparatus for stimulating power line carrier injection with reactive oscillation
First Claim
1. A method for coupling a carrier signal onto a distribution system, comprising the steps of:
- providing power to a secondary winding of a power transformer from a distribution system that is connected to a primary winding of the power transformer;
exciting a tank circuit to oscillate current at a frequency;
forcing the oscillating current through the secondary winding of the power transformer; and
coupling the oscillating current from the secondary winding of the power transformer to the primary winding of the power transformer.
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Accused Products
Abstract
Stimulating power line carrier injection with reactive oscillation comprises exciting a tank circuit to oscillate at the carrier frequency by sinking pulses of current between one node of a capacitor in the tank circuit and the other node of the capacitor. A power transformer is connected to a distribution system to inject a power line carrier onto the power line. An excitation circuit sinks short pulses of current between one node of a capacitor and the other node of the capacitor that is connected in a tank circuit arrangement with an inductor and the secondary winding of the power transformer. The tank circuit oscillates at the frequency of the excitation pulses if the resonant frequency of the tank circuit is close to the frequency of excitation. The oscillating current is coupled onto the power line system through the power transformer. The phase of the power line carrier signal is shifted by shifting the phase of the excitation pulses.
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Citations
13 Claims
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1. A method for coupling a carrier signal onto a distribution system, comprising the steps of:
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providing power to a secondary winding of a power transformer from a distribution system that is connected to a primary winding of the power transformer; exciting a tank circuit to oscillate current at a frequency; forcing the oscillating current through the secondary winding of the power transformer; and coupling the oscillating current from the secondary winding of the power transformer to the primary winding of the power transformer. - View Dependent Claims (2, 3, 4)
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5. A circuit for coupling a carrier signal onto a distribution system, comprising:
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a tank circuit that oscillates current at a frequency when pulses of current are sunk on the tank circuit at the frequency; and an excitation circuit that sinks the pulses of current on the tank circuit at the frequency. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification