Patent application number | Description | Published |
20080212340 | Method For Operating A Power Converter In A Soft-Switching Range - For converting a first DC voltage to a second DC voltage, a first bridge circuit comprised in a power converter is controlled to convert the first DC voltage to a first AC voltage. The first AC voltage is transformed to a second and possibly further AC voltage. The second and each possibly further AC voltage is converted to a DC voltage by respective bridge circuits. To increase efficiency of the power converter switches of the power converter are controlled to operate in soft switching. Thereto a duty cycle of each AC voltage is controlled. In an embodiment, a half-cycle voltage-time integral of each AC voltage is controlled to be substantially equal. | 09-04-2008 |
20120194070 | OPERATING AN ELECTRODELESS DISCHARGE LAMP - A power driver circuit for an electrodeless discharge lamp comprises a push- pull class E converter comprising power supply terminals for receiving a DC supply voltage, and lamp output terminals for supplying power to an antenna of the lamp. The converter has a first switching leg and a second switching leg arranged in parallel between the power supply terminals. The first switching leg has a series arrangement of a first switching element and a first driver circuit inductor having a common first node. The second switching leg has a series arrangement of a second switching element and a second driver circuit inductor having a common second node. The lamp output terminals are coupled between the first node and the second node. A lamp impedance matching network is coupled between the first node and the second node, wherein the impedance matching network comprises at least one series resonant capacitor coupled in series with the lamp output terminals. A starting circuit comprises a series arrangement of a starting inductor and a starting capacitor coupled between a first starting circuit terminal and a second starting circuit terminal. The first starting circuit terminal is coupled between the first switching element of the power driver circuit and a first lamp output terminal. A node coupling the starting inductor and the starting capacitor is configured to be coupled to an ignition appendix of the lamp. A gate drive circuit is configured to supply a near-sinusoidal gate drive current. | 08-02-2012 |
20130221861 | METHOD AND DEVICE FOR DRIVING AN LED STRING - The invention relates to a method and a device for driving an LED string of a first LED segment ( | 08-29-2013 |
20130221867 | LED RETROFIT LAMP - The present invention relates to an LED lamp ( | 08-29-2013 |
20130249426 | LINEAR DRIVER FOR REDUCED PERCEIVED LIGHT FLICKER | 09-26-2013 |
20130320869 | ELECTROMAGNETIC BALLAST-COMPATIBLE LIGHTING DRIVER FOR LIGHT-EMITTING DIODE LAMP - A lighting driver includes a shunt switch circuit configured to detect when an input of the lighting driver is connected to mains power without a ballast, and in response thereto to disable the lighting driver, and further configured to detect a type of ballast connected to the input of the lighting driver when the input of the lighting driver is connected to the ballast, and to regulate a bus voltage of the shunt switch circuit according to the detected type of ballast; and a switching mode power supply configured to receive the bus voltage of the shunt switch circuit and in response thereto to supply a lamp current to drive one or more light emitting diodes. | 12-05-2013 |
20140015428 | LED LIGHT SOURCE - LED light source comprising a string of LED loads (LED | 01-16-2014 |
20140015430 | LED LIGHT SOURCE - A series arrangement of LED loads (LP | 01-16-2014 |
20140021871 | INTERFACE CIRCUIT - An interface circuit is disclosed for operating a light source from an electronic fluorescent driver. In one example, the interface circuit comprises
| 01-23-2014 |
20140049174 | DRIVING DEVICE AND METHOD FOR DRIVING A LOAD, IN PARTICULAR AN LED ASSEMBLY - Driver device and a corresponding driving method for driving a load, in particular an LED assembly comprising one or more LEDs. To provide a better performance, better cost-efficiency, improved power factor and reduced losses, a driver device ( | 02-20-2014 |
20140103825 | LED LIGHT SOURCE - A string of LED loads is supplied by means of a rectified mains voltage. A cathode of each LED load is coupled to ground by means of a string. The strings are made conductive and non-conductive one by one in dependency of the instantaneous value of the rectified mains using both voltage and current sensing. | 04-17-2014 |
20140197740 | LED LIGHT SOURCE - A LED light source comprises a first rectifier (DB | 07-17-2014 |
20140203716 | ELECTRONIC BALLAST-COMPATIBLE LIGHTING DRIVER FOR LIGHT-EMITTING DIODE LAMP - A lighting driver includes a rectifier having an input connected to receive AC electrical power from an electronic ballast and having an output connected to supply a current to a plurality of light emitting diodes (LEDs) arranged in series with each other in a string, and a switching device disposed at the output of the rectifier and configured to receive a switching control signal and in response thereto to execute a switching operation to modulate an amount of power supplied to the plurality of LEDs so as to cause an average of the power supplied to the plurality of LEDs to be equal to a target power level. A current sensor may be provided to sense the current, and a controller configured to control the switching operation of the switching device in response to the sensed current. | 07-24-2014 |
20140265901 | DRIVER FOR CONNECTING LED TO ELECTRONIC BALLAST - To allow an electronic ballast ( | 09-18-2014 |
20140375223 | LED LIGHT SOURCE - LED light source suitable for use with a phase cut dimmer (III), comprising •input terminals (K1, K2) for connection to an AC supply voltage, •a rectifier (I) coupled to the input terminals, | 12-25-2014 |
20150061499 | LIGHT GENERATING DEVICE - A light generating device ( | 03-05-2015 |
20150061520 | lamp device and a method for operating a lamp device - According to one embodiment there is provided a lamp device ( | 03-05-2015 |