Patent application number | Description | Published |
20090051297 | Frequency modulation method and device for high intensity discharge lamp - An electronic control gear for a HID lamp receives an input signal for operating the lamp and frequency modulates the input signal to generate a frequency modulated output signal that drives an arc of the lamp. The frequency modulation of the output signal sweeps continuously between a low frequency modulation and a high frequency modulation, the low frequency modulation being a frequency f | 02-26-2009 |
20100060180 | CIRCUIT ARRANGEMENT FOR IGNITING AND OPERATING A DISCHARGE LAMP - A circuit arrangement for igniting and operating a gas discharge lamp having a half-bridge arrangement, which acts as a step-down inverter in quasi-resonant mode, a lamp inductor and a resonance capacitor that form a resonant circuit, and having an ignition transformer whose secondary winding is connected on the one hand to a lamp electrode and is connected on the other hand to the tie point between the lamp inductor and resonance capacitor, wherein the primary winding of the ignition transformer is connected with its first end to the tie point between the lamp inductor and resonance capacitor, and with its second end to the tie point of two series connected diodes, the first diode being connected to the power supply unit, and the second diode being connected to circuit ground. | 03-11-2010 |
20100060193 | METHOD AND CIRCUIT ARRANGEMENT FOR INCREASING THE DIELECTRIC STRENGTH OF METAL OXIDE TRANSISTORS AT LOW TEMPERATURES - A method and circuit arrangement for increasing the dielectric strength of at least one metal oxide transistor at low temperatures is described. Various embodiments include heating the metal oxide transistor prior to the application of a voltage in the vicinity of a breakdown voltage of the metal oxide transistor. | 03-11-2010 |
20100117548 | CIRCUIT ARRANGEMENT FOR IGNITING AND OPERATING A DISCHARGE LAMP - A circuit arrangement for starting and for operating a gas discharge lamp with an AC step-down converter or a half-bridge arrangement, which functions as a step-down inverter during quasi-resonant operation, a lamp inductor and a resonant capacitor, which form a resonant circuit, and a smoothing inductor, wherein the resonant capacitor is dimensioned in terms of its value such that, during normal operation of the lamp, a voltage ripple of over 100 V from maximum to maximum is present across said resonant capacitor, the smoothing inductor being dimensioned in such a way that it can filter the majority of the voltage ripple, and the switching frequency at the same time being between 200 kHz and 500 kHz. | 05-13-2010 |
20110037398 | Circuit Arrangement and Method for Starting a Discharge Lamp - A circuit arrangement for starting a discharge lamp, with a primary circuit, which comprises a series circuit comprising an inductance (L), a starting capacitor (C | 02-17-2011 |
20110234116 | METHOD FOR PROGRAMMING ELECTRONIC OPERATING DEVICES FOR DISCHARGE LAMPS AND ELECTRONIC OPERATING DEVICE FOR DISCHARGE LAMPS - A method for programming an electronic operating device is provided. The method may include programming the operating device via a slow on/off switching pattern of its supply voltage, the operating device being configured to automatically dim the connected light or lights on a time-control basis after programming, and choosing the time base of the on/off switching pattern used for programming such that a person can carry out the programming using a clock and an on/off switch for the supply voltage. | 09-29-2011 |
20110298383 | ELECTRONIC OPERATING DEVICE FOR A GAS DISCHARGE LAMP - The invention relates to an electronic operating device for a gas discharge lamp having: a DC/DC voltage converter, a power factor correction circuit, an inverter, a lamp inductor, and having a full bridge with two half bridges which can be controlled separately, wherein the DC/DC voltage converter additionally acts as a voltage step-down converter, and the inverter additionally has the following functions: lamp current regulation, the function of stepping down the voltage to the lamp voltage, and resonant ignition. | 12-08-2011 |
20130154499 | CIRCUIT ARRANGEMENT AND METHOD FOR STARTING AND OPERATING A HIGH-PRESSURE DISCHARGE LAMP - A circuit arrangement may include: a half-bridge arrangement with a half-bridge center point, connected to an intermediate circuit voltage with a reference potential and a feed voltage potential; a lamp inductor connected at one end to the half-bridge center point; a starting stage connected to the other end of the lamp inductor and to the intermediate circuit voltage; a first switch connected between the reference potential and the starting stage; a series circuit of a first and a second capacitor connected to the intermediate circuit voltage; terminals for connecting a high-pressure discharge lamp, a first terminal being connected to the starting stage and a second terminal being connected to a node between the first and second capacitors; a two-port network, a first port of said two-port network connected to the starting stage and a second port of said two-port network connected to the node between the first and second capacitors. | 06-20-2013 |
20130229128 | Circuit arrangement and method for operation of a high-pressure discharge lamp below its nominal power - In various embodiments, a method for operating a high-pressure discharge lamp below its nominal power is provided, wherein the high-pressure discharge lamp is operated at nominal power with an alternating current having a predetermined operating frequency, and the lamp voltage is measured during a half-cycle at least at the start of a half-cycle and at the end of a half-cycle. The method may include: reducing the present operating frequency below an upper limit; and changing the current shape of the alternating current to a monopitch roof-shaped current shape, which is dependent on the difference in the lamp voltages at the end and at the start of the half-cycle. | 09-05-2013 |
20140361704 | CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING AND DIMMING AT LEAST ONE LED - A circuit arrangement includes a converter having a converter switch and a driver for the converter switch. The driver includes an interface coupling to a dimming apparatus supplying a dimming value. The driver provides an RF signal with a duty ratio at the output of the driver. The driver modifies the RF signal by superposition of a PWM signal such that, in correlation with the supplied dimming value, a predefinable number of periods of the RF signal is chopped from the RF signal. The driver is configured to reduce the duty ratio of the RF signal during at least one predefinable period of the RF signal in order to adjust levels of dimming which correspond to dimming values which are between a first and a second dimming value which differ from one another by at least one period of the RF signal. | 12-11-2014 |