Patent application number | Description | Published |
20100148683 | CIRCUIT FOR OPERATING LIGHT EMITTING DIODES (LEDS) - The present invention relates to a circuit arrangement for supplying power to, and for controlling, light-emitting diodes for illuminating, and to a method therefor. The invention provides a driver circuit for providing an operating current for operating at least one light-emitting diode, wherein the operating current has different positive intensities. | 06-17-2010 |
20110199023 | OPERATING CIRCUIT FOR LEDS - An operating circuit is provided for an LED, which receives a voltage, and which supplies a voltage for the LED via a coil, having a first switch clocked by a control/regulating unit. Power is stored temporarily in the coil when the first switch is activated so that the power is discharged via a diode and via the LED when the first switch is turned off. A capacitor is arranged in parallel to the LED and maintains current through the LED during the demagnetization of the coil. A first switch generates a first sensor signal dependent on the current flowing through the first switch, and/or a second sensor unit, which detects whether demagnetization of the coil unit has occurred and generates a sensor signal. The signals are fed to the control/regulating unit and processed. The control/regulating unit reactivates the first switch when the coil is demagnetized and/or the diode is blocking. | 08-18-2011 |
20120133295 | POWER REGULATION OF LED BY MEANS OF AN AVERAGE VALUE OF THE LED CURRENT AND BIDIRECTIONAL COUNTER - A circuit for the power regulation of an LED comprises a converter having a switch. The LED is interconnected in an output circuit, wherein a control unit controls the magnetization of an inductor, in that it actively clocks the switch. A measured actual value representative of the average value of the LED current is returned to the control unit and compared to a reference value. | 05-31-2012 |
20120139544 | System And Method For Recording The Characteristic Curves Of Light-Emitting Diodes (LEDs) - The invention relates to a system for recording characteristic curves for a light-emitting diode arrangement ( | 06-07-2012 |
20120280638 | Controllable Retrofit LED Lamps and Lighting System Having an LED Lamp - The invention relates to a retrofit LED lamp ( | 11-08-2012 |
20130134893 | Led Controller Comprising a Clocked Current Source - The invention relates to an LED driver circuit comprising: a circuit block for providing an adjustable DC voltage and a clocked constant current source, e.g. a DC/DC converter that is supplied with the DC voltage, comprising a switch that is clocked by a control circuit in such a way that a reduction of the activation period ton of the switch leads to a reduction in the provision of power. One or more LEDs can be supplied from the constant current source and in addition to reducing the activation period t0N, the control unit is designed to change at least one other control variable of the constant current source or the circuit block in order to provide the direct current. | 05-30-2013 |
20130193849 | Modular LED-Lighting System - The invention relates to a modular LED-light comprising a first module ( | 08-01-2013 |
20140361698 | LED CONVERTER INCLUDING A RESONANT CONVERTOR - The invention relates to an LED converter for operating a load comprising at least one LED series that includes at least one LED, preferably multiple LEDs. On the primary side, the LED converter comprises a resonant converter supplied with a direct current voltage. The resonant converter has a half-bridge that is constructed of two reciprocally clocked switches and that provides a supply voltage for the LED series through a serial/parallel resonance circuit connected to the midpoint of said half-bridge. To regulate the power transferred by the LED converter to the LED series as a feedback factor in each switch-on cycle, a control unit is designed to directly or indirectly determine a peak value of the feedback factor through the lower-potential switch of the half-bridge and to adjust the clocking of the half-bridge, i.e. the frequency and/or the duty factor, as a control factor. | 12-11-2014 |
20150028761 | TRANSFORMER FOR A LAMP, LED CONVERTER, AND TRANSFORMER OPERATION METHOD - A galvanically isolated transformer ( | 01-29-2015 |
20150077003 | METHOD FOR OPERATING AN LLC RESONANT CONVERTER FOR A LIGHT-EMITTING MEANS, CONVERTER, AND LED CONVERTER DEVICE - An LLC resonant transformer ( | 03-19-2015 |
20150084544 | OPERATING CIRCUIT FOR LEDS, HAVING DIMMING SIGNAL COMPRISING HIGH-FREQUENCY MODULATED PULSE PACKET SIGNAL WITH HARMONIZED FREQUENCIES - The invention relates to a method for activating at least one LED, which is supplied with a direct current voltage or a rectified alternating current voltage and which by means of a coil (L | 03-26-2015 |