# US 10,772,180 B2 · State retention load control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,180 B2 - Document ID: US10772180B2 - Status: Granted - Kind: B2 - Application number: 15/641,933 - Filed: 2017-07-05 - Published: 2018-01-11 - Granted: 2020-09-08 - Earliest claimed: 2016-07-05 - Assignees: Lutron Technology Company LLC - Applicants: Lutron Technology Company LLC - Inventors: Ankit Bhutani; Timothy Mann; David T. Saveri, III - Web page: https://patentgrep.com/patent/US10772180B2 ## CPC - H04L 12/2816: {Controlling appliance services of a home automation network by calling their functionalities (arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station; in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom H04Q9/00)} - H05B 39/041: {the light-intensity of the source (H05B39/08 takes precedence)} - H05B 47/11: by determining the brightness or colour temperature of ambient light - H05B 47/14: by determining electrical parameters of the light source - H05B 47/19: via wireless transmission - H05B 47/1965: {using handheld communication devices} - E06B 9/322: Details of operating devices, e.g. pulleys, brakes, spring drums, drives ({operating devices E06B9/68} ; devices of general interest specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material B65H75/34) - E06B 9/68: Operating devices or mechanisms, e.g. with electric drive - E06B 2009/6809: {Control} - H04L 67/10: in which an application is distributed across nodes in the network (software deployment G06F8/60; multiprogramming arrangements G06F9/46) - H05B 47/115: by determining the presence or movement of objects or living beings - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract A load control system may include control devices for controlling power provided to an electrical load. The control devices may include an input device and a load control device. The load control system may include a hub device. The hub device may include a communication circuit and a control circuit. The communication circuit may be configured to receive a digital message from the control device. The control circuit may be configured to determine, based on content of the digital message, whether the control device has experienced a power removal event. The hub device may send, via the communication circuit, a power removal event indication to the control device of whether the control device has experienced the power removal event. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The load control system of claim 1, wherein the hub device comprises a hub device memory, wherein the hub device memory is configured to store the power state of the first control device. ### Claim 3 (depends on 2) The load control system of claim 2, wherein the hub device is configured to: retrieve, from the hub device memory, the prior power state of the first control device based on the first control device experiencing the system power removal event, wherein the prior power state of the first control device is a power state of the first control device prior to the control device experiencing the system power removal event; and send, to the first control device, the prior power state of the first control device; and wherein the first control device is configured to adjust the power state of the first control device to the prior power state in response to receiving the prior power state from the hub device. ### Claim 4 (depends on 1) The load control system of claim 1, wherein the first control device is configured to: receive, from the hub device, a command to revert to the prior power state; retrieve the prior power state of the first control device; and adjust the power state of the first control device to the retrieved prior power state. ### Claim 5 (depends on 1) The load control system of claim 1, wherein: the first control device comprises a first control device memory, wherein the first control device memory is configured to store the power state of the first control device; and on a condition that the hub device indicates the first control device has experienced the system power removal event and that the system power removal event has concluded, the first control device is configured to restore the first control device to the stored power state. ### Claim 6 A method for adjusting a power state of a first control device, the method comprising: determining that the first control device has experienced a power removal event due to a loss of power from a first alternating current (AC) circuit; sending a query message to a second control device that is configured to be connected to a second AC circuit; determining, based on contents of a 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; determining, 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 based on the determination that the first control device experienced the system power removal event, adjusting the 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. ### Claim 7 (depends on 6) The method of claim 6, wherein the prior power state of the first control device is stored in memory of at least one of a hub device or the first control device. ### Claim 8 (depends on 6) The method of claim 6, wherein the method further comprises: detecting a loss of power at a hub device prior to sending the query message to the second control device. ### Claim 9 A method for adjusting a power state of a control device, the method comprising: determining that the control device has experienced a power removal event due to a loss of power from a first alternating current (AC) circuit; sending a query message to a device other than the control device that is configured to be connected to a second AC circuit; determining, based on contents of a message received from the device other than the control device in response to the query message, that the device other than the control device has experienced a loss of power from the second AC circuit; determining, based on the loss of power at the control device from the first AC circuit and the loss of power at the device other than the control device from the second AC circuit, that the power removal event experienced by the control device is a system power removal event; and based on the determination that the power removal event experienced by the control device is the system power removal event, adjusting the power state of the control device to a prior power state, wherein the prior power state of the control device is the power state of the control device prior to the power removal event. ### Claim 10 (depends on 9) The method of claim 9, further comprising: storing the prior power state of the control device; and sending, to the control device, the prior power state of the control device. ### Claim 11 (depends on 9) The method of claim 9, further comprising: storing, by the control device, the prior power state of the control device; and sending, to the control device, a command to revert to the prior power state of the control device. ### Claim 12 (depends on 9) The method of claim 9, wherein the device other than the control device is a hub device or a lighting device. ### Claim 13 (depends on 1) The load control system of claim 1, wherein the first control device is a controllable light bulb. ### Claim 14 (depends on 13) The load control system of claim 13, wherein the second control device is a dimmer device for controlling power delivered to a lighting device. ### Claim 15 (depends on 1) The load control system of claim 1, wherein the control circuit of the hub device is configured to detect a loss of power at the hub device prior to sending the query message to the second control device. ### Claim 16 (depends on 1) The load control system of claim 1, wherein the control circuit of the hub device is configured to: determine, based on contents of a third message, that the first control device that is configured to be connected to the first AC circuit has experienced a second power removal event due to a second loss of power from the first AC circuit; send, via the communication circuit, a second query message to the second control device that is configured to be connected to the second AC circuit; determine, based on contents of a fourth message received from the second control device in response to the second query message, that the second control device has continued to receive power from the second AC circuit; and determine, based on the second loss of power at the first control device from the first AC circuit and the second control device continuing to receive power from the second AC circuit, that the second power removal event experienced by the first control device is a local power removal event. ### Claim 17 (depends on 16) The load control system of claim 16, wherein the control circuit of the hub device is configured to: based on the determination that the second loss of power experienced by the first control device is the local power removal event, control the power state of the control device to a predetermined power state. ### Claim 18 (depends on 17) The load control system of claim 17, wherein the predetermined prior power state of the control device comprises an on power state at a predetermined intensity state. ### Claim 19 (depends on 6) The method of claim 6, further comprising: determining, based on contents of a third message, that the first control device has experienced a second power removal event due to a second loss of power from the first AC circuit; sending a second query message to the second control device that is configured to be connected to the second AC circuit; determining, based on contents of a fourth message received from the second control device in response to the second query message, that the second control device has continued to receive power from the second AC circuit; and determining, based on the second loss of power at the first control device from the first AC circuit and the second control device continuing to receive power from the second AC circuit, that the second power removal event experienced by the first control device is a local power removal event. ### Claim 20 (depends on 19) The method of claim 19, further comprising: based on the determination that the second loss of power experienced by the first control device is the local power removal event, controlling the power state of the control device to a predetermined power state. ### Claim 21 (depends on 20) The method of claim 20, wherein the predetermined power state of the control device comprises an on power state at a predetermined intensity state. ### Claim 22 (depends on 9) The method of claim 9, further comprising: determining that the control device has experienced a second power removal event due to a second loss of power from the first AC circuit; sending a second query message to the device other than the control device that is configured to be connected to the second AC circuit; determining, based on contents of a second message received from the device other than the control device in response to the query message, that the device other than the control device has continued to receive power from the second AC circuit; and determining, based on the second loss of power at the control device from the first AC circuit and the device other than the control device continuing to receive power from the second AC circuit, that the second power removal event experienced by the control device is a local power removal event. ### Claim 23 (depends on 22) The method of claim 22, further comprising: based on the determination that the loss of power experienced by the control device is the local power removal event, controlling the power state of the control device to a predetermined power state. ### Claim 24 (depends on 23) The method of claim 23, wherein the predetermined prior power state of the control device comprises an on power state at a predetermined intensity state. ### Claim 25 (depends on 9) The method of claim 9, wherein the method further comprises: detecting a loss of power at a hub device prior to sending the query message to the device other than the control device.