Abstract: Various embodiments may relate to a power supply unit including an output for outputting a current, a communications line, a current-measuring device and a microcontroller including an analog-to-digital converter. The current-measuring device generates a current on the communications line which is proportional to the conductance of a current-setting resistance, the current is convertable into a digital value by the analog-to-digital converter, the power supply unit assumes various operating states based on the digital value of the measured current, and at least one light source module is connectable to the output, wherein the at least one light source module has the current-setting resistance, which is connectable to the communications line. Various embodiments may further relate to a light source module including an input, a communications line and a current-setting resistance for setting the current applied to the light source module.

Abstract: Various embodiments may relate to a power supply unit, including an output for outputting an operating current depending on an internal measurement signal, a communications line, and a current-measuring device, which is connected to the communications line. The current-measuring device is designed to generate a current on the communications line which is proportional to the conductance of a current-setting resistance. The current-measuring device has a current mirror, which is designed to mirror the generated current on the communications line. The current-measuring device is designed to convert the mirrored current into an internal measurement signal with a reference potential which is different than the communications line. At least one light source module is connectable to the output, wherein the at least one light source module has the current-setting resistance, which is connectable to the communications line.

Abstract: The apparatus has a weathering chamber, in which at least one sample can be arranged, and at least one radiation source, which are arranged in the weathering chamber, wherein the radiation source is provided with a storage device, on which data relating to the radiation source are stored.

Abstract: The apparatus for artificially weathering or testing the lightfastness of samples has a weathering chamber, in which at least one sample can be arranged, and a plurality of radiation sources, which are arranged in the weathering chamber and which are operable independently of one another, wherein the apparatus is configured in such a way that the at least one sample is movable on a closed path around the plurality of radiation sources.

Abstract: In a weathering chamber, a UV radiation device is arranged and at least one sample can be arranged in a sample plane spaced apart from the UV radiation device. The UV radiation device has a plurality of UV light emitting diodes (UV LEDs) containing two or more classes of UV LEDs having different emission bands. The emission bands are chosen in such a way that a spectral distribution with which a specific spectral UV characteristic is approximated can be obtained in the sample plane.

Abstract: A UV light emitting diode (UV-LED) is arranged in a weathering chamber and a UV light receiving diode, which is constructed on the same material basis as the UV LED, is arranged relative to the UV LED in such a way that a portion of the radiation emitted by the UV LED impinges on the UV light receiving diode during the operation of the device.

Abstract: In a weathering chamber, a UV radiation device is arranged and at least one sample can be arranged in a sample plane spaced apart from the UV radiation device. The UV radiation device has a plurality of UV light emitting diodes (UV LEDs) containing two or more classes of UV LEDs having different emission bands. The emission bands are chosen in such a way that a spectral distribution with which a specific spectral UV characteristic is approximated can be obtained in the sample plane.

Abstract: A buck converter for operating at least one LED. In this case, the buck inductor comprises a first buck inductor and a second buck inductor, wherein a charge pump is coupled between the coupling point of the two buck inductors and a supply connection of a control apparatus which is used for actuating a buck switch.

Abstract: A UV light emitting diode (UV-LED) is arranged in a weathering chamber and a UV light receiving diode, which is constructed on the same material basis as the UV LED, is arranged relative to the UV LED in such a way that a portion of the radiation emitted by the UV LED impinges on the UV light receiving diode during the operation of the device.

Abstract: A device has a weathering chamber, in which a UV radiation device is arranged and at least one sample can be arranged. The UV radiation device has a plurality of UV light emitting diodes (UV LEDs) containing UV LEDs of different emission bands. The UV LEDs can be driven in such a way that in each case UV LEDs of a specific emission band can be switched on and off jointly, independently of UV LEDs of the other emission bands. In the method, at least one sample is irradiated with radiation from at least one UV LED of a specific emission band and variations of the sample on account of the irradiation are subsequently analyzed.

Abstract: A converter for providing a current for an LED includes: a buck diode, a buck inductor and a buck switch; and a first auxiliary switch, wherein the buck switch and the buck diode are coupled in series, wherein the buck inductor is coupled between the interconnection point between the buck diode and the buck switch, on one side, and a first output connection, on the other side. A reference electrode of the first auxiliary switch is coupled to a second node, at which a second voltage can be provided, which second voltage is correlated with the current provided to the LED, wherein the first auxiliary switch is coupled to the buck switch such that the disconnection time of the buck switch is fixed by the first voltage and the switch-on time of the buck switch is fixed by the sum of the first voltage and the second voltage.

Abstract: A circuit for actuating a lighting unit comprising: (120) a current mirror (T1, T2) which can be biased with a reference voltage source (D1); a hysteresis circuit (130) which is connected to the output of the current mirror (T1, T2); and a step-down converter (T3, D2, L1) with an electronic switch (T3), the electronic switch (T3) being connected to the output of the hysteresis circuit (130); wherein the lighting unit (120) can be actuated by the step-down converter (T3).

Abstract: 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

Abstract: 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.

Abstract: 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.

Abstract: In various embodiments, a circuit for operating an LED includes input terminals for coupling to a supply voltage; output terminals for providing output DC voltage(s) to the LED(s); an inverter having a bridge circuit with at least first and second electronic switches comprising control electrodes, reference electrodes and working electrodes, wherein first and second electronic switches are serially coupled between input terminals, forming a first bridge center point; a first inductor serially coupled between first bridge center point and an output terminal; and a drive circuit having output terminals, wherein one output terminal is coupled to control electrode of first electronic switch and second output terminal is coupled to control electrode of second electronic switch; configured so that-drive circuit comprises control devices, wherein one control device includes a second inductor magnetically coupled to the first inductor, and wherein second control device includes third inductor magnetically coupled to

Abstract: A circuit arrangement for operation of lamps, including a half-bridge arrangement which has an upper and a lower electronic switch (Q1, Q2), which are connected in series, each having a control connection and forming a neutral point (N1) at their connection point. The circuit arrangement further includes: a load circuit, in which a load circuit current (IL1) flows, is connected to the neutral point (N1); a feedback device; a stop device; a timer coupled to the input of the stop device; and a trigger device. A sequence controller is configured to preset an on-time (ton) during the preheating time of the electrodes of the lamps, by means of the timer, and after the preheating time of the electrodes of the lamps, this on-time is continuously increased until it corresponds at least to one quarter of the period duration of the resonant frequency of the reactance network.

Abstract: 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.

Abstract: 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.

Abstract: The present invention relates to an electronic ballast for discharge lamps (LA) which have preheatable electrodes (E1, E2). The electronic ballast has a measuring apparatus (M), which is designed to measure, during the preheating process, a variable, which is correlated with the electrode temperature increased by the preheating, of at least one of the electrodes (E1, E2) of a connected discharge lamp (LA), and a control apparatus (C), which is designed to match the electrode temperature, during the preheating process, in response to the measurement by adjusting an operational parameter of the electronic ballast. Furthermore, the electronic ballast is designed to detect cross discharges or a sufficient operating temperature of one of the electrodes (E1, E2) and possibly to ignite the discharge.