Digital control system providing power and communications via existing power wiring
First Claim
1. A load control system comprising:
- a power device adapted to receive power from a power source via an electrical wiring; and
a controller adapted to be coupled on the electrical wiring between the power source and the power device, the controller configured to produce a periodic voltage that is adapted to be received by the power device, the controller configured to transmit a forward digital message to the power device by encoding digital information in timing edges of the periodic voltage;
wherein the power device is configured to transmit a reverse digital message to the controller via the electrical wiring; and
wherein the controller is configured to transmit a short pattern immediately prior to the power device transmitting the reverse digital message, the short pattern allowing the power device to synchronize to a frequency of the periodic voltage, andwherein the short pattern has a length shorter than a length of the forward digital message.
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Accused Products
Abstract
A two-way load control system comprises a power device, such as a load control device for controlling an electrical load receiving power from an AC power source, and a controller adapted to be coupled in series between the source and the power device. The load control system may be installed without requiring any additional wires to be run, and is easily configured without the need for a computer or an advanced commissioning procedure. The power device receives both power and communication over two wires. The controller generates a phase-control voltage and transmits a forward digital message to the power device by encoding digital information in timing edges of the phase-control voltage. The power device transmits a reverse digital message to the controller via the power wiring.
47 Citations
24 Claims
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1. A load control system comprising:
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a power device adapted to receive power from a power source via an electrical wiring; and a controller adapted to be coupled on the electrical wiring between the power source and the power device, the controller configured to produce a periodic voltage that is adapted to be received by the power device, the controller configured to transmit a forward digital message to the power device by encoding digital information in timing edges of the periodic voltage; wherein the power device is configured to transmit a reverse digital message to the controller via the electrical wiring; and wherein the controller is configured to transmit a short pattern immediately prior to the power device transmitting the reverse digital message, the short pattern allowing the power device to synchronize to a frequency of the periodic voltage, and wherein the short pattern has a length shorter than a length of the forward digital message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A controller for controlling power delivered from a power source to an electrical load, the controller comprising:
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a controllably conductive device configured to receive a source voltage from the power source and generate a periodic voltage on an electrical wiring; a control circuit coupled to the controllably conductive device to generate the periodic voltage, the control circuit configured to transmit a forward digital message to a power device via the electrical wiring by encoding digital information in timing edges of the periodic voltage; and a reverse receiving circuit configured to receive a reverse digital message from the power device via the electrical wiring; wherein the control circuit is configured to transmit a short pattern immediately prior to the power device transmitting the reverse digital message, the short pattern configured to synchronize the power device to a frequency of the periodic voltage, and wherein the short pattern has a length shorter than a length of the forward digital message. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A power device for controlling power delivered from a power source to an electrical load in response to a controller that is coupled between the power source and the power device, the power device comprising:
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a forward receiving circuit adapted to be coupled to the controller via an electrical wiring, and configured to receive a periodic voltage from the controller via the electrical wiring; a reverse transmitting circuit adapted to be coupled to the controller via the electrical wiring; a control circuit coupled to the forward receiving circuit for receiving a forward digital message from the controller in response to digital information encoded in timing edges of the periodic voltage, and coupled to the reverse transmitting circuit for transmitting a reverse digital message to the controller via the electrical wiring; wherein the control circuit is configured to receive a short pattern from the controller immediately prior to the power device transmitting the reverse digital message, the short pattern configured to synchronize the power device to a frequency of the periodic voltage, and wherein the short pattern has a length shorter than a length of the forward digital message. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification