Powerline communicated load control
First Claim
1. A system for transmitting communication signals, the system comprising:
- an injector circuit connected, in series, between a powered circuit conductor and a decoder, the injector circuit configured to modulate, in series, an AC power signal with a time sequence of instantaneous DC voltage offsets over at least a portion of a voltage phase to produce one or more bits to be transmitted on the powered circuit conductor, wherein the one or more bits form a command, wherein the AC power signal is modulated with respect to ground/neutral used by AC voltage, and wherein modulating the AC power signal includes varying one or more properties of a periodic waveform by subtracting a magnitude of the DC voltage offsets from a magnitude of the AC voltage; and
the decoder connected to the powered circuit conductor and configured to be connected to a load, the decoder further configured to demodulate the instantaneous DC voltage offsets to extract the command to control the load based on a selected control scheme.
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Accused Products
Abstract
A system for transmitting communication signals, the system comprising an injector circuit connected to a powered circuit conductor and configured to modulate a power signal with a direct current voltage offset, the direct current voltage offset being within a range that causes approximately 1 percent or less total harmonic distortion of the power signal; and a decoder connected to the powered circuit conductor and a load, the decoder configured to demodulate the direct current voltage offset to control the load. A method for transmitting communication signals, the method comprising modulating a power signal on a powered circuit conductor with a direct current voltage offset, the direct current voltage offset being within a range that causes approximately 1 percent or less total harmonic distortion of the power signal; and demodulating the direct current voltage offset to control a load.
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Citations
22 Claims
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1. A system for transmitting communication signals, the system comprising:
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an injector circuit connected, in series, between a powered circuit conductor and a decoder, the injector circuit configured to modulate, in series, an AC power signal with a time sequence of instantaneous DC voltage offsets over at least a portion of a voltage phase to produce one or more bits to be transmitted on the powered circuit conductor, wherein the one or more bits form a command, wherein the AC power signal is modulated with respect to ground/neutral used by AC voltage, and wherein modulating the AC power signal includes varying one or more properties of a periodic waveform by subtracting a magnitude of the DC voltage offsets from a magnitude of the AC voltage; and the decoder connected to the powered circuit conductor and configured to be connected to a load, the decoder further configured to demodulate the instantaneous DC voltage offsets to extract the command to control the load based on a selected control scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for transmitting communication signals, the method comprising:
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modulating, in series, an AC power signal on a powered circuit conductor with a time sequence of instantaneous DC voltage offsets over at least a portion of a voltage phase to produce one or more bits to be transmitted on the powered circuit conductor, wherein the one or more bits form a command, wherein the AC power signal is modulated with respect to ground/neutral used by AC voltage, and wherein modulating the AC power signal includes varying one or more properties of a periodic waveform by subtracting a magnitude of the DC voltage offsets from a magnitude of the AC voltage; and demodulating the instantaneous DC voltage offsets to extract the command to control a load. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification