US Patent No. 10,772,180

STATE RETENTION LOAD CONTROL SYSTEM


Patent No. 10,772,180
Issue Date September 08, 2020
Title State Retention Load Control System
Inventorship Ankit Bhutani, Bethlehem, PA (US)
Timothy Mann, Quakertown, PA (US)
David T. Saveri, III, Nazareth, PA (US)
Assignee Lutron Technology Company LLC, Coopersburg, PA (US)

Claim of US Patent No. 10,772,180

1. A load control system, comprising:a first control device that is configured to be connected to a first alternating current (AC) circuit, wherein the first control device is configured to control an amount of power provided from the first AC circuit to a first electrical load;
a second control device that is configured to be connected to a second AC circuit, wherein the second control device is configured to control an amount of power provided from the second AC circuit to a second electrical load; and
a hub device, comprising:
a communication circuit, wherein the communication circuit is configured to send and receive messages from the first control device; and
a control circuit configured to:
determine, based on contents of a first message, that the first control device that is configured to be connected to the first AC circuit has experienced a power removal event due to a loss of power from the first AC circuit;
send, via the communication circuit, a query message to the second control device that is configured to be connected to the second AC circuit;
determine, based on contents of a second message received from the second control device in response to the query message, that the second control device has experienced a power removal event due to a loss of power from the second AC circuit;
determine, based on the loss of power at the first control device from the first AC circuit and the loss of power at the second control device from the second AC circuit, that the power removal event experienced by the first control device is a system power removal event; and
in response to the determination that the first control device experienced the system power removal event, send, via the communication circuit, a first power removal event indication to the first control device that indicates that the power removal event experienced by the first control device is the system power removal event,
wherein the first control device is configured to, in response to receiving the first power removal event indication, adjust a power state of the first control device to a prior power state, wherein the prior power state of the first control device is the power state of the first control device prior to the first control device experiencing the system power removal event.