Transmission of digital data over an A.C. supply line
First Claim
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1. A method of transmitting data over an A.C. power supply line of a load having cyclic power supply periods, comprising acts of:
- organizing a switching of an A.C. supply voltage according to a coding of the data to be transmitted outside the cyclic power supply periods of the load; and
using the A.C. supply voltage as an envelope of pulses having a higher frequency.
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Abstract
The present invention relates to a method of data transmission over an A.C. power supply line of a load to be cyclically powered, including organizing a switching of the A.C. supply voltage according to a coding of the data to be transmitted and outside cyclic load supply periods.
73 Citations
23 Claims
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1. A method of transmitting data over an A.C. power supply line of a load having cyclic power supply periods, comprising acts of:
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organizing a switching of an A.C. supply voltage according to a coding of the data to be transmitted outside the cyclic power supply periods of the load; and
using the A.C. supply voltage as an envelope of pulses having a higher frequency. - View Dependent Claims (2, 3, 4)
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5. A transmitter of digital data over an A.C. power supply line of a load having cyclic power supply periods, including:
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a switching means adapted to interrupt the A.C. power supply line according to a coding of the digital data to be transmitted, that uses the A.C. supply signal as an envelope of pulses having a higher frequency; and
wherein the switching means is controlled outside the cyclic supply periods of the load. - View Dependent Claims (6)
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7. A receiver of digital data transmitted over an A.C. power supply line of a load having cyclic supply periods, the receiver including:
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a means for extracting from a load supply voltage the digital data that was transmitted; and
wherein the data is formed by a switching, outside the cyclic supply periods of the load, of the A.C. supply voltage according to a predetermined coding. - View Dependent Claims (8)
an associated capacitor adapted to provide an approximately D.C. voltage to a load supply circuit; and
a one-way conduction means adapted to isolating the capacitor from the means for extracting the digital data.
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9. A transmitter of digital data over an A.C. power supply line of a load having cyclic power supply periods, including:
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a switching circuit to switch an A.C. supply voltage according to a coding of the digital data to be transmitted; and
wherein the switching circuit switches the A.C. supply voltage outside the cyclic power supply periods of the load. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system for transmitting digital data over an A.C. power supply line of a load, including:
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a switching circuit that, during a first period of an A.C. supply signal, allows the load to be supplied by the A.C. supply signal, and during a second period of the A.C. supply signal, switches the signal according to a coding of the digital data to be transmitted; and
a first element that supplies a D.C. voltage to the load during the second period of the supply signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A receiver of digital data transmitted over an A.C. power supply line of a load having cyclic power supply periods, including:
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a circuit that extracts the digital data that was transmitted from a load supply voltage; and
wherein the digital is formed by a switching of an A.C. supply voltage outside the cyclic power supply periods during which the A.C. supply voltage supplies the load. - View Dependent Claims (23)
a capacitor that provides a substantially D.C supply voltage to the load during periods when the A.C. supply voltage does not supply the load and is being switched to transmit the digital data; and
a one-way conduction element that isolates the capacitor from the circuit that extracts the digital data.
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Specification