# US 2013/0154518 A1 · Systems and methods for data communication from an led device to the driver system

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- Number: US 2013/0154518 A1
- Document ID: US20130154518A1
- Status: Published application
- Kind: A1
- Application number: 13/714,795
- Filed: 2012-12-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: TerraLUX, Inc.
- Inventors: Jeffrey Paul Davies
- Web page: https://patentgrep.com/patent/US20130154518A1

## CPC

- H05B 45/18: using temperature feedback
- H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B 47/185: via power line carrier transmission
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

One or more operating conditions of an LED device is sensed, and the sensed condition is communicated to an LED driver by modulating a load thereof.

## Claims

### Claim 1

A system for communicating one or more operating conditions of an LED device to an LED driver, the system comprising:
sensing circuitry for sensing an operating condition affecting the LED device; and
communication circuitry for modulating a load of the LED driver based on the sensed operating condition, thereby communicating the sensed condition to the LED driver.

### Claim 2 (depends on 1)

The system of claim 1, wherein the operating condition is temperature.

### Claim 3 (depends on 2)

The system of claim 2, wherein the sensing circuitry comprises a thermistor.

### Claim 4 (depends on 1)

The system of claim 1, wherein the communication circuitry comprises a device for switching a load in and out of the LED driver load.

### Claim 5 (depends on 4)

The system of claim 4, wherein the device comprises a transistor.

### Claim 6 (depends on 4)

The system of claim 4, wherein the load comprises a resistor.

### Claim 7 (depends on 4)

The system of claim 4, wherein the communication circuitry comprises a controller for controlling the device based on data from the sensing circuitry.

### Claim 8 (depends on 1)

The system of claim 1, wherein the communication circuitry is configured to modulate the load in a temporal pattern corresponding to a digital value that itself corresponds to the sensed operating condition.

### Claim 9 (depends on 8)

The system of claim 8, wherein the temporal pattern corresponds to a bit rate, the bit rate being faster than an activation rate of the sensing circuitry.

### Claim 10 (depends on 8)

The system of claim 8, wherein the communication circuitry further comprises monitoring circuitry for monitoring an output waveform of the LED driver.

### Claim 11 (depends on 10)

The system of claim 10, wherein the controller synchronizes the temporal pattern with a frequency of the output waveform.

### Claim 12

A method for controlling an LED device connected to an LED driver, the method comprising:
sensing an operating condition of the LED device;
modulating a load of the LED driver based on the sensed operating condition; and
varying an output of the LED driver based on the modulated load.

### Claim 13 (depends on 12)

The method of claim 12, wherein the modulated load is detected by the LED driver, which responsively adjusts the output based thereon.

### Claim 14 (depends on 12)

The method of claim 12, wherein the load is modulated in a temporal pattern corresponding to a digital value that itself corresponds to the sensed operating condition.

### Claim 15 (depends on 14)

The method of claim 14, further comprising monitoring an output waveform of the LED driver and synchronizing the temporal pattern with a frequency of the monitored output waveform.

### Claim 16 (depends on 14)

The method of claim 14, wherein the temporal pattern corresponds to a bit rate, the bit rate being faster than a sensing rate of sensing the operating condition.