Abstract: A circuit arrangement for supplying a lamp wattage on a high-pressure gas discharge lamp in the form of an alternating current having an operating frequency, said operating frequency being frequency-modulated within large limits such that no acoustic resonances are embodied in the lamp. Amplitude modulation through the frequency response of an interface is compensated by modulating an amplitude of a supply voltage.

Abstract: 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 f1 in a range of 125 kHz to 150 kHz and the high frequency modulation being a frequency f2 in a range of 230 kHz to 300 kHz, where f2?f1 is at least 0.4*f1. A power amplifier changes an amplitude of the frequency modulated output signal during the low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant, and a variable gain transformer adjusts a voltage of the frequency modulated output signal during starting of the lamp.

Abstract: 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.

Abstract: A lamp holder (61) for a gas discharge lamp (5), having at least two receptacles (B1, B2) for at least two pins (P1, P2) of a gas discharge lamp (5), wherein at least one shielding conductor (S1a, S1b, S2a, S2b) is disposed in the vicinity of each receptacle (B1, B2).

Abstract: A circuit arrangement for operating a high pressure discharge lamp includes a bridge circuit with at least two switches, a control device controlling the switches. The bridge circuit is a half-bridge circuit having exactly two switches. The control device switches on and off in an alternating manner, the first switch and the second switch of the bridge circuit having a first frequency. When the first switch is switched off for controlling the other switch with a rectangular signal of a second frequency which is greater than the first frequency and a predeterminable connection duration. The circuit also includes a tension measuring device measuring an actual value of tension over the high pressure discharge lamp. A reference device provides at least one upper threshold value for the voltage via the high pressure discharge lamp. A comparison device compares the actual voltage over the high pressure discharge lamp with the threshold value.

Abstract: 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.

Abstract: 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.

Abstract: 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 f1 in a range of 125 kHz to 150 kHz and the high frequency modulation being a frequency f2 in a range of 230 kHz to 300 kHz, where f2?f1 is at least 0.4*f1. A power amplifier changes an amplitude of the frequency modulated output signal during the low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant, and a variable gain transformer adjusts a voltage of the frequency modulated output signal during starting of the lamp.

Abstract: 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 f1 in a range of 125 kHz to 150 kHz and the high frequency modulation being a frequency f2 in a range of 230 kHz to 300 kHz, where f2-f1 is at least 0.4*f1. A power amplifier changes an amplitude of the frequency modulated output signal during the low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant, and a variable gain transformer adjusts a voltage of the frequency modulated output signal during starting of the lamp.

Abstract: A circuit arrangement for providing a lamp wattage to a high-pressure gas discharge lamp (Lp), the arrangement includes an inverter (T1, T2) which supplies to the high-pressure gas discharge lamp (Lp), a lamp current (IL) which is essentially an alternating current with an operating frequency which is frequency modulated in a frequency range between a minimum frequency and a maximum frequency, an arithmetic mean is defined which is equal to the temporal mean of the frequency values for the operating frequency, swept in a lamp operation. A limit mean is defined which is equal to one half of the sum of minimum frequency and maximum frequency and is less that the arithmetic mean.

Abstract: A circuit arrangement for starting a discharge lamp, with a primary circuit, which comprises a series circuit comprising an inductance (L), a starting capacitor (C1) and a first switch (SG), the switch being in the form of a threshold value switch, and the inductance comprising the primary winding (L1) of the starting transformer (TR), and the primary circuit being designed to generate a starting pulse for the discharge lamp at the secondary winding (L2) of a starting transformer (TR), the primary circuit having two decoupled voltages, a first voltage, which is correlated substantially with the energy of the starting pulse, and a second voltage, which controls the operating time of the switch, the first voltage being lower than the threshold value of the first switch.

Abstract: A method for minimizing the insulation stress of a high-pressure discharge lamp system, with an operating device, which generates a high voltage for starting the high-pressure discharge lamp, wherein a starting voltage time sum applied during lamp starting is minimized, the starting voltage time sum is the sum of all time segments Zi during which the magnitude of the starting voltage exceeds a starting voltage limit, and the starting voltage limit is defined as the factor range of a maximum value, in terms of magnitude, of the applied high voltages.

Abstract: High-pressure discharge lamps can only be restarted in the hot state at a very high starting voltage. In order to avoid hotstarting, a method for operating high-pressure discharge lamps without hotstarting comprises two high-pressure discharge lamps (12a, 12b) being provided in one luminaire. The two high-pressure discharge lamps are driven as follows: When the luminaire is switched off, the first lamp is switched off, and the second lamp is set to be in a standby state for the period of time for the recovery of the first lamp or remains in such a state, in which it is not switched off. When the luminaire is switched on again during this period of time, the second lamp can assume the operating state again immediately without being started. If the luminaire is not switched on again, the second lamp is likewise switched off once the period of time has elapsed.

Abstract: A method for operating a high pressure discharge lamp with the aid of a high frequency signal is disclosed. The high pressure discharge lamp comprises at least one first (14a) and one second electrode (14b), the first (14a) and the second electrodes (14b) being arranged in such a way that the electrode tips (18a, 18b) are situated opposite one another, a filament (16a, 16b) respectively being arranged in the region of the electrode tips (18a, 18b). The high pressure discharge lamp runs through the following phases in a start phase before its stationary operation: a delay phase, a breakdown phase, an electrode heating phase and a burner heating phase. After termination of the electrode heating phase, the first (14a) and the second electrodes (14b) are driven within at least one prescribable time duration in such a way that the high pressure discharge lamp is operated with the aid of a lamp current (Iboost) that is higher than the rated lamp current (Inenn).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: High-pressure discharge lamps can only be restarted in the hot state at a very high starting voltage. In order to avoid hotstarting, a method for operating high-pressure discharge lamps without hotstarting comprises two high-pressure discharge lamps (12a, 12b) being provided in one luminaire. The two high-pressure discharge lamps are driven as follows: When the luminaire is switched off, the first lamp is switched off, and the second lamp is set to be in a standby state for the period of time for the recovery of the first lamp or remains in such a state, in which it is not switched off. When the luminaire is switched on again during this period of time, the second lamp can assume the operating state again immediately without being started. If the luminaire is not switched on again, the second lamp is likewise switched off once the period of time has elapsed.

Abstract: A circuit arrangement for operating a high pressure discharge lamp includes a bridge circuit with at least two switches, a control device controlling the switches. The bridge circuit is a half-bridge circuit having exactly two switches. The control device switches on and off in an alternating manner, the first switch and the second switch of the bridge circuit having a first frequency. When the first switch is switched off for controlling the other switch with a rectangular signal of a second frequency which is greater than the first frequency and a predeterminable connection duration. The circuit also includes a tension measuring device measuring an actual value of tension over the high pressure discharge lamp. A reference device provides at least one upper threshold value for the voltage via the high pressure discharge lamp. A comparison device compares the actual voltage over the high pressure discharge lamp with the threshold value.

Abstract: Disclosed is a circuit arrangement for supplying a lamp wattage to a high-pressure gas discharge lamp (Lp) in the form of an alternating current having an operating frequency, said operating frequency being frequency-modulated within large limits. The time characteristic of the operating frequency is selected such that more power is supplied to the lamp at greater frequencies, thus reducing the risk of exciting acoustic resonance in the lamp. Amplitude modulation through the frequency response of an interface (L1, C2, C3) is compensated by means of the time characteristic of the operating frequency.