| Patent application number | Description | Published |
|---|
| 20090085493 | Electronic Ballast for Discharge Lamps Having an Eol Monitoring Circuit - The invention relates to an electronic ballast for a discharge lamp LA | 04-02-2009 |
| 20090251065 | Circuit Arrangement and Method for Operating at Least One LED - A method and a circuit arrangement for operating at least one LED, includes: a first and a second mains connection for connecting a mains voltage; a first rectifier, whose rectifier input is coupled to the mains connections and at whose rectifier output the rectified mains voltage can be provided; an electronic pump switch coupled to the rectifier output, defining a pump node; a main energy store coupled to that side of the electronic pump switch which faces away from the rectifier output; an inverter coupled to the main energy store supplied with energy therefrom. The inverter provides an inverter voltage at its inverter output which has an inverter frequency; a pump network coupling the inverter output to the pump node; a matching network, via which coupling the inverter output to the connection terminals for at least one LED, wherein the matching network has a resonant circuit having a natural frequency. | 10-08-2009 |
| 20090251198 | Circuit Arrangement and Method for Driving an Electronic Component With an Output Signal From a Microprocessor - A circuit arrangement for driving an electronic component with the output signal (V | 10-08-2009 |
| 20100033104 | CIRCUIT CONFIGURATION FOR STARTING AND OPERATING AT LEAST ONE DISCHARGE LAMP - A circuit arrangement for starting and operating at least one discharge lamp is provided. | 02-11-2010 |
| 20100052541 | Circuit Arrangement and Method for Operating a Discharge Lamp with Preheatable Electrodes - A circuit arrangement for operating a discharge lamp (LA) with preheatable electrodes comprising: an input terminal for applying an input voltage (U | 03-04-2010 |
| 20100073965 | Self-Oscillating DC-DC Converter and Method Therefor - A self-oscillating DC/DC converter comprising: a first and a second input connection for application of an input DC voltage; a first and a second bipolar transistor, wherein each bipolar transistor has a control electrode, a reference electrode and a working electrode; at least one first coupling capacitor; wherein a first switching junction is formed by the junction of the working electrode and the reference electrode of the first bipolar transistor, and a second switching junction is formed by the junction of the working electrode and the reference electrode of the second bipolar transistor, wherein the first and the second switching junctions are connected in series with respect to the input DC voltage; a rectifier, with an output that is coupled to a first and a second output connection in order to provide an output DC voltage; a transformer, which has a primary winding, a secondary winding and at least one control winding; wherein the primary winding is coupled between a galvanic connection of the first and the second switching junction and the at least one coupling capacitor; wherein the secondary winding is coupled to the input of the rectifier; wherein each bipolar transistor has an associated control winding which is coupled to the control electrode of the respective bipolar transistor and at least one timer, which is coupled between the respectively associated control winding and the respective control electrode. | 03-25-2010 |
| 20100102755 | Method for Controlling a Half-Bridge Circuit and Corresponding Half-Bridge Circuit - A circuit arrangement for operation of lamps, comprising a half-bridge arrangement which has an upper and a lower electronic switch (Q | 04-29-2010 |
| 20100156299 | Ballast for a Discharge Lamp With Adaptive Preheating - The present invention relates to an electronic ballast for discharge lamps (LA) which have preheatable electrodes (E | 06-24-2010 |
| 20100194284 | CIRCUIT ARRANGEMENT FOR OPERATING A CONVERTER - A circuit arrangement for operating a converter, which comprises a bridge circuit having at least a first bridge switch and a second bridge switch and a first bridge center point and a second bridge center point is provided. The circuit arrangement may include a current differential amplifier, the first input of the current differential amplifier being coupled to a first comparison signal input, the second input of the current differential amplifier being coupled to a second comparison signal input, the output of the current differential amplifier being coupled to a control electrode of a first electronic switch. | 08-05-2010 |
| 20100289419 | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-PRESSURE GAS DISCHARGE LAMP AND CORRESPONDING METHOD - A circuit arrangement is provided, which may include an input; an output; an inverter, configured to provide an AC supply voltage from a DC supply voltage; a control device configured to drive the inverter, the control device being configured to initiate a preheating phase once a preheating criterion has been met; a resonant circuit having a resonant inductor and having a resonant capacitor; and a transformer configured to preheat electrodes of a gas discharge lamp; wherein the primary winding of the transformer is connected in series with the resonant capacitor and is connected directly to the reference potential of the control device, and an electrical switch is coupled in parallel with the primary winding of the transformer, which switch has a control connection, which is coupled to the control device being configured to transfer the electrical switch into its electrically conducting switching state once the starting criterion has been met. | 11-18-2010 |
| 20100295459 | CIRCUIT ARRANGEMENT FOR OPERATING A SERIES CIRCUIT OF AT LEAST TWO LOW-PRESSURE GAS-DISCHARGE LAMPS, AND A CORRESPONDING METHOD - In various embodiments, a circuit arrangement for operating a series circuit of a first and a second low-pressure gas-discharge lamp is provided, which may include an input with a first and a second input connection for application of a supply voltage; an output with a first arrangement, which has a first and a second connection pair for connection of the first lamp, and a second arrangement, which has a first and a second connection pair for connection of the second lamp, wherein a first connection of the second pair of the first arrangement is coupled to a first connection of the first pair of the second arrangement; a resonant circuit; and a capacitive voltage divider, which has a first capacitor, which is coupled in parallel with the first arrangement, and a second capacitor, which is coupled in parallel with the second arrangement. | 11-25-2010 |
| 20110050129 | BUCK CONVERTER FOR MAKING POWER AVAILABLE TO AT LEAST ONE LED - A buck converter for providing a current for an LED includes an input for connection of a DC voltage source; an output for connection of the LED; and a Buck diode, a Buck inductor and a Buck main switch which has a control electrode, a working electrode and a reference electrode. The diode and the main switch are coupled in series, wherein the connecting point between the diode and the main switch is coupled to the second output connection. The converter includes: an auxiliary winding which is coupled to the inductor and has a connection which is coupled to the second input connection and a connection which is coupled to the control electrode of the switch, wherein the auxiliary winding is coupled to the inductor such that, when current is flowing through the switch, a current is provided through the auxiliary winding to the control electrode of the switch. | 03-03-2011 |
| 20110050130 | BUCK CONVERTER AND METHOD FOR PROVIDING A CURRENT FOR AT LEAST ONE LED - A Buck converter may include an input for connecting a DC voltage source; an output for connecting an LED; and a diode, an inductor and a main switch; wherein the diode and the main switch are coupled in series, wherein the inductor is coupled between the connecting point for the diode and the main switch, and a first output connection, wherein the converter further includes: a first auxiliary switch supplied with a first voltage; and a second auxiliary switch supplied with a second voltage, wherein the first auxiliary switch and the second auxiliary switch are coupled to the main switch such that the first voltage stipulates the switch-off time for the main switch and the second voltage stipulates the switch-on time for the main switch. | 03-03-2011 |
