Patent application number | Description | Published |
20130082601 | OVER-VOLTAGE HANDLING OF LIGHTING DEVICE - The present disclosure relates to a lighting device that employs at least one string of LEDs as a lighting source. The string of LEDs is coupled in series with a first semiconductor switch, wherein the string of LEDs and the first semiconductor switch are coupled between a power supply node and ground. During a period when the lighting device is powering up after being initially provided power by a power supply, the system controller is configured to monitor a drive current through the first string of LEDs and modulate a control signal provided to the first semiconductor switch based on the drive current to prevent the drive current from exceeding a maximum allowable drive current value for the first string of LEDs. | 04-04-2013 |
20130082602 | OVERCURRENT HANDLING FOR A LIGHTING DEVICE - The present disclosure relates to a lighting device that employs at least one string of LEDs as a lighting source. The string of LEDs is coupled in series with a first switch, wherein the string of LEDs and the first switch are coupled between a power supply node and ground. During a normal operation mode, a system controller is configured to operate the first switch to deliver a drive current to the string of LEDs from the power supply node. The system controller is associated with circuitry that allows the system controller to monitor the drive current and determine when an overcurrent condition occurs. Upon detecting the overcurrent condition, the system controller will open the first switch to stop the drive current from flowing through the string of LEDs. | 04-04-2013 |
20130082610 | TEMPERATURE CURVE COMPENSATION OFFSET - A lighting device includes a first array of LEDs, a temperature sensor, memory, and a system controller. The memory may include a first duty cycle offset and first curve information that defines a relationship between temperature and a duty cycle for driving at least one LED of the first array of LEDs. The system controller will determine a temperature based on information from the temperature sensor. Based on the temperature, the system controller will determine a first pre-calibrated duty cycle that corresponds to the temperature from the first curve information and then adjust the first pre-calibrated duty cycle with the first duty cycle offset to generate a first calibrated duty cycle. The LED is then driven with a first pulse width modulated signal having the first calibrated duty cycle. | 04-04-2013 |
20130082616 | OVER-TEMPERATURE HANDLING FOR LIGHTING DEVICE - A lighting device employs at least one string of LEDs as a lighting source. The string of LEDs is coupled in series with a first switch, wherein the string of LEDs and the first switch are coupled between a power supply node and ground. During a normal operation mode, a system controller is configured to close the first switch to deliver a drive current to the string of LEDs from the power supply node. The system controller is further associated with a temperature sensor and is configured to detect an over-temperature condition based on information provided by the temperature sensor. Upon detecting the over-temperature condition, the system controller will open the first switch to stop the drive current from flowing through the string of LEDs. | 04-04-2013 |
20140063779 | LIGHTING DEVICE INCLUDING SPATIALLY SEGREGATED LUMIPHOR AND REFLECTOR ARRANGEMENT - A lighting device includes one or more lumiphoric materials spatially segregated from one or more electrically activated (e.g., solid state) emitters and arranged to emit light toward a reflector for reflection of lumiphor-converted light emissions toward a light transmissive end of the lighting device. One or more adjustment elements may be arranged adjust position of the at least one lumiphoric material, and/or to adjust at least one of (a) position, (b) aim, and (c) focus, of the at least one electrically activated light emitting source. | 03-06-2014 |
20140239848 | DYNAMIC LIGHT EMITTING DEVICE (LED) LIGHTING CONTROL SYSTEMS AND RELATED METHODS - Dynamic light emitting device (LED) lighting adjustment systems and related methods are disclosed. In one aspect, a method can receive, at an LED lighting fixture, a lighting adjustment signal corresponding to a target lighting level and determine a delta value that represents a difference between a current lighting level of the LED lighting fixture and the target lighting level and a step time value associated with the determined delta value. The method can further include adjusting the current lighting level of the LED lighting fixture to a new current lighting level for the duration of the step time value and repeating the determining and adjusting steps until the new current lighting level equals the target lighting level. | 08-28-2014 |
20140270793 | OPTICAL COMMUNICATION FOR SOLID-STATE LIGHT SOURCES - The disclosure relates to a lighting fixture, which includes an array of solid-state light sources that are configured to generate light for general illumination lighting purposes and control circuitry. A drive signal is used to drive solid-state light sources. The control circuitry is configured to use a control output to control the drive signal to at least one of the solid-state light sources. The control output is configured to control the drive signal to 1) set at least one characteristic of the light generated by the array of the solid-state light sources, and 2) modulate the light with data for transmission. The light is modulated such that any change in the at least one characteristic based on the light being modulated is anthropically imperceptible. The characteristic of the light generated by the array of solid-state light sources may include the intensity, color, color temperature and the like. | 09-18-2014 |
20150035443 | LIGHTING APPARATUS FOR USE WITH CONTROLLED CURRENT DRIVERS - An apparatus includes a bus configured to be coupled to a controlled current source and at least one light emitting device coupled to the bus. The apparatus further includes a voltage regulator circuit configured to regulate a voltage at the bus and a current regulator circuit configured to control a current through the at least one light emitting device. The current regulator circuit may be used to control a color output of the apparatus. | 02-05-2015 |