| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 315120000 | Combined with signal, indicator, or alarm | 21 |
| 20100141149 | FAULT PROTECTION METHODS AND APPARATUS FOR COLD CATHODE FLUORESCENT LAMPS - The present disclosure provides methods and apparatus for fault protection for electronic devices (e.g., cold cathode fluorescent lamps). In one embodiment, a fault signal is detected and compared with a threshold to output a comparison signal. The comparison signal is then processed to generate a trigger signal, which triggers a fault control block once it satisfies certain fault conditions. | 06-10-2010 |
| 20100181918 | LIGHT SOURCE DRIVING DEVICE - A light source driving device for driving a light source includes a power stage circuit, a transformer circuit, a control circuit, and a fault detecting circuit. The power stage circuit converts an external electrical signal to an alternating current (AC) signal. The transformer circuit is connected between the power stage circuit and the light source to convert the AC signal to a high voltage electrical signal adapted for driving the light source. The fault detecting circuit detects whether the light source is nonfunctional, and outputs a fault signal upon the condition that the light source is nonfunctional. The fault detecting circuit includes a voltage level comparison circuit and a variable-benchmark voltage circuit. The control circuit is connected between the fault detecting circuit and the power stage circuit to output a control signal to the power stage circuit based on the fault signal. | 07-22-2010 |
| 20110115383 | THERMALLY COMPENSATED END OF LIFE TIMER FOR LED BASED AIRCRAFT LIGHTING - A thermally compensated End-of-Life (EoL) timer and method. An example method determines if a light emitting diode (LED) is in an ON state. If the LED is determined to be in the ON state, sensing junction temperature or a temperature proximate to the LED that can be correlated back to the LED junction temperature, a fixed frequency clock signal is gated based on the sensed temperature and an accumulative counter value is recorded based on the gated clock signal. An end-of-life signal is generated if the accumulative counter value is at least one of equal to or greater than a predefined threshold value. In one embodiment, the LED is shut off when the end-of-life signal has been generated. In another embodiment, an indication that the LED is at its end of life is provided when the end-of-life signal has been generated. | 05-19-2011 |
| 20110210670 | LIGHTING SYSTEM WITH A PLURALITY OF LEDs - A lighting system ( | 09-01-2011 |
| 20110227483 | Electrodeless Lamp Protecting Device - An electrodeless lamp protecting device installed between an electrodeless lamp and a power source comprises a substrate having a feedback signal input module, a signal level determination module and a protection signal output module installed on the substrate. A signal of the power source is transmitted from the feedback signal input module to the signal level determination module, and the signal serves as a reference for an output signal of the protection signal output module, such that the electrodeless lamp has an automatic protection function upon the receipt of an abnormal signal. | 09-22-2011 |
| 20120056543 | BYPASS CIRCUITRY FOR SERIALLY COUPLED LIGHT EMITTING DIODES AND ASSOCIATED METHODS OF OPERATION - The present technology is generally related to LED bypass circuits and associated methods of operation. In one embodiment, an LED bypass circuit includes a monitoring circuit and a bypass switch. The monitoring circuit is coupled to the LED to monitor the differential voltage across the LED. The bypass switch is coupled to the LED in parallel. When an open status is detected by the monitoring circuit, the bypass switch is turned on to bypass the LED. | 03-08-2012 |
| 20120062122 | OPEN LED BYPASS CIRCUIT AND ASSOCIATED METHODS OF OPERATION - The embodiments of the present circuit and method disclose a circuit to bypass a target circuit when an open status is detected. The present circuit may comprise a sample circuit, a monitoring circuit and a bypass circuit. The sample circuit may comprise a capacitor coupled to the target circuit. The monitoring circuit may be coupled to the capacitor and may have an output configured to generate an output signal selectively indicating the open status. The bypass circuit may comprise a switch, wherein the switch has a control terminal coupled to the output of the monitoring circuit and wherein the switch may be configured to be selectively turned ON to bypass the target circuit in accordance with the output of the monitoring circuit. | 03-15-2012 |
| 20120161635 | ORGANIC LIGHT EMITTING DIODE DISPLAY AND DRIVING METHOD THEREOF - An organic light emitting display device according to the present invention comprises a display unit; a power supply unit; a driving unit including an output buffer generating the reference voltage and applying the reference voltage to the pixels, and generating a current path control signal in a different logic level along with controlling whether to operate the power IC according to an operating mode; and a leakage current cut-off unit switching a current path between the output terminal of the power supply unit and the input terminal of the OLED driving voltage according to the current path control signal. | 06-28-2012 |
| 20130020943 | Power Failure Reporting in a Networked Light - Power is stored in a networked light allowing the networked light to send a message over the network providing information that the networked light is turning off if external power is no longer available. | 01-24-2013 |
| 20130069534 | END-OF-LIFE INDICATOR FOR LAMPS - End-of-life indicators for lamps, and methods for indicating the end-of-life for lamps, are provided. A solid state light source end-of-life indicator is located on the exterior of a housing of a lamp, and includes at least one light emitting diode. The solid state light source end-of-life indicator emits light at the end of the life of the lamp. The solid state light source end-of-life indicator may emit light upon receiving an end-of-life signal from an end-of-life detection circuit, which detects when the lamp is at an end of its life. | 03-21-2013 |
| 20130099670 | METHOD AND APPARATUS FOR LED STRING SHORT CIRCUIT DETECTION AND PROTECTION - An apparatus for LED string short circuit detection constituted of: a constant current drive circuit; a plurality of LED strings, a first end of each of the plurality of LED strings coupled to a common output of the constant current drive circuit; a first sense resistor coupled between a second end of each of the plurality of LED strings and a chassis; a second sense resistor coupled between the chassis and a return of the constant current drive circuit; and a comparing circuit arranged to compare the amount of current flow through the first sense resistor with amount of current flow through the second sense resistor, the comparing circuit arranged to assert a fault signal in the event that the amount of current flow through the second sense resistor exceeds the current flow through the first sense resistor by a predetermined minimum value. | 04-25-2013 |
| 20130106288 | SUPERVISION CIRCUIT FOR ORGANIC LIGHT EMITTING DIODE | 05-02-2013 |
| 20130119867 | LED CURRENT BALANCE APPARATUS - The present invention provides an LED current balance apparatus, which utilities capacitances coupled to secondary windings of a transformer to store voltage differences between LED strings. Thereby, the driving voltages applied to LED strings are respectively modulated to make the LED strings flowing through a same driving current. A current regulating apparatus is coupled to all LED strings to stabilize total current of the LED strings at a predetermined current. | 05-16-2013 |
| 20130140990 | Open LED Detection and Recovery System for LED Lighting System - A fault-tolerant controller for a lighting system comprising: a plurality of light emitting diode (LED) circuits and a controllable power source to power the plurality of LED circuits. The controller comprising a minimum voltage selector to determine a minimum voltage from a plurality of feedback voltages, one feedback voltage for each of the plurality of LED circuits. A control logic to regulate the drive voltage for the LEDs; and an overvoltage warning mechanism to determine an overvoltage of the drive voltage. The controller identifies one or more open-circuit conditions, one for each LED circuit, for which the respective feedback voltage is below an open-circuit threshold, and which causes the minimum voltage selector to exclude one or more respective feedback voltages associated with the LED circuits which have an open-circuit condition. | 06-06-2013 |
| 20140042906 | ENERGY-SAVING ILLUMINATION DEVICE DETECTING PROXIMITY OF HUMAN BODY - An illumination device which responds to a human presence includes a lamp holder, a light source, an infrared sensing unit in a human body sensing module, and a driving control unit. The lamp holder defines an inserting groove according to a connector above a circuit board. The human body sensing module includes a connecting port, and is inserted into the inserting groove. The connecting port is electrically connected to the connector. The infrared sensing unit is position on the human body sensing module, for receiving a thermal radiation and emitting a signal according to the thermal radiation. The driving control unit is positioned on the human body sensing module, and electrically connected to the infrared sensing unit and the connecting port, for receiving the signal and emitting a driving signal, thus the light source is turned on or off, or changing an illumination intensity according to the driving signal. | 02-13-2014 |
| 20140049163 | ELECTRONIC DEVICE CAPABLE OF CHANGING COLOR OF CASING AND METHOD THEREOF - An electronic device capable of changing color of casing includes a casing, at least parts of the casing being made of transparent light-guiding material; a light emitting module for emitting light with N colors; a thermal sensor for sensing an environmental temperature; a storage unit for storing a look-up table, the look-up table recording N temperature ranges and the N colors, each of the N colors being corresponding to one of the N temperature ranges; and a control unit electrically connected to the light emitting module, the thermal sensor and the storage unit and used for comparing the environmental temperature with the N temperature ranges of the look-up table so as to control the light emitting module to emit light with one of the N colors. | 02-20-2014 |
| 20140077703 | Control Circuit and Control Method of Light Emitting Device Circuit - The present invention discloses a control circuit and a control method of a light emitting device circuit. When the light emitting device circuit is normally connected in normal operation, an output current is regulated to a predetermined current. When the light emitting device circuit is removed, an output voltage is regulated to a predetermined voltage. When the light emitting device circuit is reconnected, the output current is regulated to the predetermined current. The output voltage is at or above a level when the light emitting device circuit is normally connected in normal operation, and the predetermined voltage is lower than this level. | 03-20-2014 |
| 20140084792 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND DRIVING METHOD THEREOF - The present invention has been made in an effort to provide an organic light emitting display device comprising a panel; a power supply supplying power to the panel; a current detection unit detecting a current flowing through power line wiring of the panel and outputting the detected current; and a power controller comparing the detected current with a current value configured internally and outputting a shutdown signal which turns off the power supply if the detected current exceeds the predetermined current value. | 03-27-2014 |
| 20150115799 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND DRIVING METHOD THEREOF - An organic light emitting display device, can include a panel, a driving unit driving the panel, a timing controller controlling the driving unit, a power supply supplying power to the panel, a current detection unit detecting a current flowing through power line wiring of the panel and outputting the detected currents, and a power controller comparing the detected current with a current value configured internally and outputting a shutdown signal which turns off the power supply if the detected current exceeds the predetermined current value. | 04-30-2015 |
| 20150137684 | SYSTEM AND METHOD FOR MONITORING STREET LIGHTING LUMINAIRES - A system for identifying a fault in a light source is presented. The system includes at least one luminaire that includes the light source configured to emit light. Also, the at least one luminaire includes a monitoring device disposed proximate to the light source. The monitoring device includes a sensing unit configured to measure an amount of light emitted by the light source, and a squawk unit configured to generate a squawk signal based on the amount of light emitted from the light source, where the squawk signal is indicative of the fault in the light source. Further, the system includes a diagnostic unit communicatively coupled to the at least one luminaire and configured to determine the fault in the light source based on the squawk signal, and transmit a termination signal to the squawk unit to decouple an electrical power supply from the light source. | 05-21-2015 |
| 20160143100 | SEMICONDUCTOR LIGHT SOURCE DRIVING APPARATUS AND PROJECTION TYPE DISPLAY APPARATUS - A semiconductor light source driving apparatus includes a light source unit which has a plurality of series-connected light source modules. Each light source module includes: a switching element which is controlled to turn on/off by a control signal; series-connected light source elements; and an overvoltage detection circuit in which a zener diode and a light emitting element are connected in series and a light detecting element is disposed to face the light emitting element, the switching element, the light source elements, and the overvoltage detection circuit being connected in parallel to each other. The semiconductor light source driving apparatus further includes: a DC (Direct Current) power supply which supplies a DC voltage to the light source unit; a switching element driving unit which drives the switching element of each of the light source modules to turn on/off the switching element; and a controller which controls the switching element driving unit so that the switching element is turned on according to detection of light by the light detecting element. | 05-19-2016 |
