Abstract: The invention relates to a method for producing mineral wool, wherein a mineral base material is melted in a cupola furnace having a shaft to hold the base material, the lower section of said shaft being provided with a grate, and beneath said grate there is a combustion chamber. The combustion chamber is heated by one or a plurality of burners, the burner or burners being run on liquid or gaseous fuel and an oxygen-containing gas. The burners are operated such that the length of the flames occurring during combustion of the fuel with the oxygen-containing gas is between 60% and 100% of the combustion chamber diameter.

Abstract: A circuit arrangement for operating a discharge lamp (LA) with preheatable electrodes comprising: an input terminal for applying an input voltage (UE); an output terminal for providing an output voltage (UA) to a lamp generator (LG) for operating the discharge lamp (LA); a switching unit (14) for power factor correction which is coupled between the input terminal and the output terminal; a monitoring apparatus (20) which is adapted to switch off the lamp generator (LG) in the event of the presence of at least one switch-off criterion; an integrated circuit (16), which is adapted to drive the switching unit (14) for power factor correction, the integrated circuit (16) having a disable input; and a blocking apparatus (18), which is adapted to generate a blocking signal at its output when the lamp generator (LG) is switched off, the output of the blocking apparatus (18) being coupled to the disable input of the integrated circuit (16).

Abstract: A circuit arrangement for starting and operating at least one discharge lamp is provided.

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: 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: 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: The invention relates to an electronic ballast for a discharge lamp LA1 having an EOL monitoring circuit R1, R2, U1, R9, U2-A, U2-B, U3-A, AE, which has a current differential amplifier U1 having a current mirror input.

Abstract: The present invention relates to a circuit arrangement for operating at least one electric lamp and at least one LED including: an inverter having a bridge circuit having at least one first bridge transistor and one second bridge transistor arranged in series with one another, a center point of the bridge circuit being defined between the first and second bridge transistors; a lamp supply unit for supplying the electric lamp with energy from the bridge circuit, which includes a supply line with an inductance, via which the center point (M) of the bridge circuit is coupled to a first connection for the electric lamp; the lamp supply unit including an LED supply unit, which is designed to supply the at least one LED with energy. Moreover, it relates to an operating method for at least one electric lamp and at least one LED using such a circuit arrangement.

Abstract: 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.

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.

Abstract: A circuit arrangement for operation of lamps, comprising a half-bridge arrangement which has an upper and a lower electronic switch (Q1, Q2), which are connected in series, each have a control connection and form a neutral point (N1) at their connection point; a load circuit in which a load circuit current (IL1) flows is connected to the neutral point (N1); the load circuit includes a reactance network having a resonant frequency, and adapted so that a lamp can be connected thereto; the load circuit is configured such that, during normal operation for a connected lamp after the opening of one of the electronic switches (Q1, Q2), the voltage on the respective other one of the electronic switches (Q1, Q2) tends to zero after a transient time; a feedback device which couples a feedback variable from the load circuit to the control connections of the electronic switches (Q1, Q2), such that the electronic switches (Q1, Q2) are switched on alternately; a stop device, which is coupled to the control connections of t

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: A circuit arrangement for operating a discharge lamp (LA) with preheatable electrodes comprising: an input terminal for applying an input voltage (UE); an output terminal for providing an output voltage (UA) to a lamp generator (LG) for operating the discharge lamp (LA); a switching unit (14) for power factor correction which is coupled between the input terminal and the output terminal; a monitoring apparatus (20) which is adapted to switch off the lamp generator (LG) in the event of the presence of at least one switch-off criterion; an integrated circuit (16), which is adapted to drive the switching unit (14) for power factor correction, the integrated circuit (16) having a disable input; and a blocking apparatus (18), which is adapted to generate a blocking signal at its output when the lamp generator (LG) is switched off, the output of the blocking apparatus (18) being coupled to the disable input of the integrated circuit (16).

Abstract: A circuit arrangement for starting and operating at least one discharge lamp is provided.

Abstract: The invention relates to a method for producing mineral wool, wherein a mineral base material is melted in a cupola furnace having a shaft to hold the base material, the lower section of said shaft being provided with a grate, and beneath said grate there is a combustion chamber. The combustion chamber is heated by one or a plurality of burners, the burner or burners being run on liquid or gaseous fuel and an oxygen-containing gas. The burners are operated such that the length of the flames occurring during combustion of the fuel with the oxygen-containing gas is between 60% and 100% of the combustion chamber diameter.

Abstract: Method and device for manufacturing siliceous melts to produce light-yellow mineral wool fibres using a cupola furnace includes (a) a charge including at least two different types of briquet, wherein chemical components take into account an anticipated proportion of iron, (b) the components of Al2O3 in the briquets are a supporting structure for the melting process, (c) a plurality of high temperature gas burners for heating, an arrangement of said gas burners chosen such that the burner flames reinforce each other, (d) collecting pan flared conically downwards from a mantle of a shaft in the furnace to a floor of the furnace.

Abstract: 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.

Abstract: A circuit arrangement for driving an electronic component with the output signal (V6) from a microprocessor (MP), includes: the electronic component with a control input; a microprocessor (MP), which provides an output signal (V6) at an output (A1); wherein it furthermore includes: a first bipolar transistor (Q5) in common-base connection, whose emitter is coupled to the output (A1) of the microprocessor (MP); a second bipolar transistor (Q7) in common-emitter connection, whose base is coupled to the collector of the first bipolar transistor (Q5), wherein the collector of the second bipolar transistor (Q7) is coupled to the control input of the electronic component. Moreover, it relates to a corresponding method for driving an electronic component with the output signal (V6) from a microprocessor (MP).

Abstract: The radiation power emitted from the UV radiation sources (2) in a weathering apparatus is controlled such that the radiation power of each of the radiation sources (2) is measured in a predetermined spectral range of the radiation emitted from the radiation sources, with the spectral range being chosen such that the measured radiation power is representative of the radiation power in the UV, an averaged radiation power is calculated from the measured radiation powers, and the averaged radiation power is used for controlling the electrical power to be supplied to the radiation sources (2). In particular, the control process can be carried out in such a way that the same electrical power, within a predetermined tolerance bandwidth, is supplied to each of the radiation sources (2), and the averaged radiation power is kept constant over time at a desired nominal value.