Low voltage power line carrier communications at fundamental working frequency
First Claim
1. A method for digital data transmission in a low voltage AC power line network, comprising the steps of:
- transmitting a AC voltage waveform to deliver power in the power line network;
generating a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
introducing a triggering DC voltage having an amplitude that is higher than the threshold of the expected noise level in the carrier signal; and
receiving the carrier signal and determining from the carrier signal the digital data based on presence of the triggering voltage of the carrier signal.
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Accused Products
Abstract
A two-way carrier wave digital data transmission between a terminal station and a central station over low-voltage power line with long distance of transmission and high accuracy at low implementation costs. Long distance of data transmission is achieved by generating a high-energy communication signal by shorting the circuit near the zero crossing of the fundamental power wave, where the attenuation effect on the carrier signal is least. High accuracy of data transmission is achieved by generating a carrier communication signal at low frequency with a triggering/interrupt voltage signal that is much higher than the expected random noise signal in order to have high signal-to-noise ratio at the fundamental working frequency. As a result of the high signal-to-noise ratio, the receiver then can receive the transmitted signal and clearly differentiate between a “1” bit and a “0” bit data.
54 Citations
15 Claims
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1. A method for digital data transmission in a low voltage AC power line network, comprising the steps of:
- transmitting a AC voltage waveform to deliver power in the power line network;
generating a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
introducing a triggering DC voltage having an amplitude that is higher than the threshold of the expected noise level in the carrier signal; and
receiving the carrier signal and determining from the carrier signal the digital data based on presence of the triggering voltage of the carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- transmitting a AC voltage waveform to deliver power in the power line network;
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10. A method for digital data transmission in a low voltage AC power line network, comprising the steps of:
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transmitting a AC voltage waveform to deliver power in the power line network, said AC voltage waveform having a fundamental working frequency;
generating a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
introducing a triggering DC voltage at a frequency substantially similar to said fundamental working frequency; and
receiving the carrier signal and determining from the carrier signal the digital data. - View Dependent Claims (11)
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12. A system for digital data transmission in a low voltage AC power line network, comprising:
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means for transmitting a AC voltage waveform to deliver power in the power line network;
means for generating a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
means for introducing a triggering DC voltage having a amplitude that is higher than the threshold of the expected noise level in the carrier signal; and
means for receiving the carrier signal and determining from the carrier signal the digital data based on presence of the triggering voltage of the carrier signal.
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13. A transmitter for transmitting digital data in a low voltage AC power line network in which a AC voltage waveform is transmitted to deliver power in the power line network, the transmitter comprising:
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means for receiving the AC voltage waveform as an input;
means for generating a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
means for introducing a triggering DC voltage having a amplitude that is higher than the threshold of the expected noise level in the carrier signal; and
means for outputting the AC voltage waveform with the superimposed carrier signal.
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14. A receiver for receiving digital data transmission in a low voltage AC power line network in which a AC voltage waveform is transmitted to deliver power in the power line network, the receiver comprising:
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means for receiving a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform and having a triggering DC voltage having a amplitude that is higher than the threshold of the expected noise level in the carrier signal;
mean for detecting the triggering DC voltage; and
determining from the carrier signal the digital data based on presence of the triggering DC voltage of the carrier signal.
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15. A method for digital data communication between a central station outside the low voltage power line network and a user station at a first node in the low voltage AC power line network, comprising the steps of:
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communicating digital data between the central station and a relay agent at a second node in the low voltage AC power line network;
transmitting a AC voltage waveform in the power line network between the first and second nodes;
generating, at the first or second node, a carrier signal representing the digital data, said carrier signal superimposed on the AC voltage waveform;
introducing a triggering DC voltage having a amplitude that is higher than the threshold of the expected noise level in the carrier signal; and
receiving, at the respective second or first node, the carrier signal and determining from the carrier signal the digital data based on presence of the triggering voltage of the carrier signal.
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Specification