US Patent No. 10,194,510

MULTIPLE LOCATION LOAD CONTROL SYSTEM


Patent No. 10,194,510
Issue Date January 29, 2019
Title Multiple Location Load Control System
Inventorship Ehsan Dadashnialehi, Coopersburg, PA (US)
Robert C. Newman, Jr., Emmaus, PA (US)
Daniel Curtis Raneri, Orefield, PA (US)
Jaykrishna A. Shukla, Mays Landing, NJ (US)
Assignee LUTRON ELECTRONICS CO., INC., Coopersburg, PA (US)

Claim of US Patent No. 10,194,510

1. A load control device for use in a load control system for controlling an amount of power delivered from an AC power source to an electrical load, the load control system comprising a remote control device adapted to be coupled to the load control device via an electrical wire, the load control device comprising:a controllably conductive device adapted to be electrically coupled in series between the AC power source and the electrical load;
a control circuit configured to control the controllably conductive device to control the amount of power delivered to the electrical load using a forward phase control technique, the control circuit configured to render the controllably conductive device conductive at a transition time during a present half cycle of the AC power source and to render the controllably conductive device non-conductive at approximately the end of the present half cycle; and
a communication circuit adapted to be coupled to the electrical wire, the communication circuit configured to conduct a charging current for a power supply of the remote control device through the electrical wire, the communication circuit responsive to the control circuit to control the electrical wire between an active pull-up state and an active pull-down state to transmit a digital message to the remote control device via the electrical wire;
wherein the control circuit is configured to control the communication circuit to generate a high impedance state on the electrical wire when the communication circuit is not transmitting a digital message to the remote control device, the control circuit further configured to control the communication circuit to provide the active pull-up state on the electrical wire before or during the transition time of the controllably conductive device when the communication circuit is not transmitting a digital message to the remote control device.