Abstract: In the case of an electronic ballast (1) for operating a lamp (10) or an operating device for illumination means, having mains terminals (5) for connecting the ballast (1) or operating device to a current supply, output terminals (6) for connecting a lamp or light source to the ballast (1) or operating device and a control unit (4) for controlling and/or regulating an operating voltage delivered to the lamp (LA) or light source via the output terminals (6), external control information (Vprog) for programming or configuring the operating behavior of the operating device is delivered to the control unit (4) via a programming input, and stored in a memory (4a) associated with the control unit (4). In accordance with the invention, the programming input is formed by means of the mains terminals (5) and/or the output terminals (6) of the ballast (1) or of the operating device (2), which are connected internally with the control unit (4).

Abstract: A circuit for the generation of ignition pulses for a lamp has: an ignition pulse transformer, a device for the generation of ignition pulses (ignition pulse generator) at a primary winding of the ignition pulse transformer, which are transformed in the secondary winding of the ignition pulse transformer, a voltage detector for the detection of the voltage value of the transformed ignition pulses, and a voltage regulator for regulating the voltage value of the transformed ignition pulses to a predetermined reference value. The ignition pulse generator has, in a series circuit, a pulse capacitor and a switch, parallel to the secondary winding of the ignition pulse transformer and the lamp, wherein the regulator for the voltage value of the transformed ignition pulses sets at the pulse capacitor the voltage applied at an ignition time point. The voltage at the pulse capacitor can be set by means of selection of the switch-on and/or switch-off time points of the switch.

Abstract: An electronic ballast for at least one gas discharge lamp (LA), preferably for a fluorescent tube, having a rectifier circuit (2) connectable to a supply voltage source, a smoothing circuit (3) connected to the output of the rectifier circuit (2) for generating an intermediate circuit voltage (UZ), and an inverter (4), fed with the intermediate circuit voltage (UZ), to the output of which a terminal for the load circuit (5) containing the lamp (LA) is connected, and an overvoltage monitoring device which monitors the supply voltage (U0) delivered to the electronic ballast, whereby in the event that the supply voltage exceeds a predetermined nominal value (Ui,max), an optically or acoustically perceptible warning signal is issued.

Abstract: In an electronic ballast the output d.c. voltage (U) of a PFC intermediate circuit (3) is to be regulated. The intermediate circuit (3) has a clocked switch (S) which is controlled by a regulation circuit (7). The regulation circuit (7) includes two counters (Z1, Z2). The counter (Z1) has a greater number of count stages than the counter (Z2). The counter (Z1) is counted upwards or downwards in dependence upon the regulation difference. The counter (Z2) is repeatedly counted only in one direction and for example reset by a reset signal. By comparing the counts of corresponding count stages of the two counters (Z1) and (Z2) in a comparator, the switch on time (ton) for the clock switch (S) is determined.

Abstract: An electronic ballast which includes a resonant load circuit (L1, C1) in series with a discharge lamp (LA), the resonant load circuit being supplied by an inverter (S1, S2) which outputs variable alternating voltages at frequencies above 200 KHZ. Alternatively, an electronic transformer incorporates a load circuit and a variable output frequency inverter for operating a low volt halogen lamp (7) at variable alternating frequencies above 200 KHZ. Passive components of the ballast and transformer are integrated into a multilayer circuit (13).

Abstract: An electronic ballast for controlling the operating behavior and brightness of a gas discharge lamp, includes a full bridge circuit fed with a d.c. voltage (UBUS). The gas discharge lamp is connected as a load of the full bridge circuit, and a control circuit in each case switches on one bridge diagonal and switches off another bridge diagonal of the full bridge circuit, alternatingly. The bridge diagonals each have a regulatable constant current source for regulating a lamp current, and thereby the occurrence of flickering appearances is suppressed. As a result, the lamp can be dimmed over a very wide range of brightnesses.

Abstract: In an electronic ballast the output d.c. voltage (U) of a PFC intermediate circuit (3) is to be regulated. The intermediate circuit (3) has a clocked switch (S) which is controlled by a regulation circuit (7). The regulation circuit (7) includes two counters (Z1, Z2). The counter (Z1) has a greater number of count stages than the counter (Z2). The counter (Z1) is counted upwards or downwards in dependence upon the regulation difference. The counter (Z2) is repeatedly counted only in one direction and for example reset by means of a reset signal. By means of comparison the counts of corresponding count stages of the two counters (Z1) and (Z2) in a comparator, the switch on time (ton) for the clock switch (S) is determined.

Abstract: An electronic ballast for at least one gas discharge lamp (LA), preferably for a fluorescent tube, having a rectifier circuit (2) connectable to a supply voltage source, a smoothing circuit (3) connected to the output of the rectifier circuit (2) for generating an intermediate circuit voltage (UZ), and an inverter (4), fed with the intermediate circuit voltage (UZ), to the output of which a terminal for the load circuit (5) containing the lamp (LA) is connected, and an overvoltage monitoring device which monitors the supply voltage (U0) delivered to the electronic ballast, whereby in the event that the supply voltage exceeds a predetermined nominal value (Ui,max), an optically or acoustically perceptible warning signal is issued.

Abstract: A circuit and a method for controlling light emitting diodes (D1, D2) for illumination involve an inverter whose output frequency can be varied. The inverter includes two electronic switches (S1, S2) which convert an applied direct current voltage (Uo) into an alternating voltage. A load circuit is connected to the output of the inverter and includes a resonance element and at least one light emitting diode (D1, D2) whose brightness is controlled by altering the output frequency of the inverter.

Abstract: A circuitry arrangement for operating n gas discharge lamps, n being a whole number greater than 1, includes a single inverter, fed with d.c. voltage, for generating an a.c. voltage alterable in its frequency, delivered to a load circuit arranged at the inverter's output. The load circuit includes a series resonant circuit of an inductance and capacitance, n gas discharge lamps connected to a common node point between the inductance and capacitance, which lamps are connected in parallel to one another, and (n−1) balancing transformers for balancing currents in two gas discharge lamps. The load circuit further has for each gas discharge lamp at least one d.c. current supply line, connected between an output side terminal of a corresponding balancing transformer winding and gas discharge lamp and via which there is delivered to each gas discharge lamp a d.c. current, so as to avoid an unintended extinguishing of a lamp.

Abstract: In a circuit configuration to operate a gas discharge lamp (LA) the lamp (LA) is arranged in a full bridge circuit. A control circuit in normal operation actuates the four switches (S1-S4) in such a way that it changes over with a first frequency (f1) alternately between a first and a second state (T1, T2), whereby in the first state (T1) the two switches (S2, S3) of a first bridge diagonal are opened, one switch (S1) of the second bridge diagonal is closed and the other switch (S4) with a second frequency (f2), which is higher than the first frequency (f1), is alternately opened and closed. In the second state (T2) the four switches (S1-S4) are actuated in such a way that the lamp (LA) is pole reversed. In a start phase (TS) on the contrary the switch connected to the DC voltage source (S4) of a half-bridge is opened, the second switch (S3) of this half-bridge is closed, and the two switches (S1, S2) of the other half-bridge are with a third frequency (f3) alternately opened and closed.

Abstract: The invention relates to a control circuit for at least one light-emitting diode (1) for adjusting the current and/or the voltage of the light-emitting diode (1) to a desired value adjusted by means of a controller (3), the current, the voltage and/or the luminescence of the light-emitting diode (1) being detectable and comparable with the desired value.

Abstract: An electronic ballast for controlling the operating behavior and brightness of a gas discharge lamp, includes a full bridge circuit fed with a d.c. voltage (UBUS). The gas discharge lamp is connected as a load of the full bridge circuit, and a control circuit in each case switches on one bridge diagonal and switches off another bridge diagonal of the full bridge circuit, alternatingly. The bridge diagonals each have a regulatable constant current source for regulating a lamp current, and thereby the occurrence of flickering appearances is suppressed. As a result, the lamp can be dimmed over a very wide range of brightnesses.

Abstract: A circuitry arrangement for operating n gas discharge lamps, n being a whole number greater than 1, includes a single inverter, fed with d.c. voltage, for generating an a.c. voltage alterable in its frequency, delivered to a load circuit arranged at the inverter's output. The load circuit includes a series resonant circuit of an inductance and capacitance, n gas discharge lamps connected to a common node point between the inductance and capacitance, which lamps are connected in parallel to one another, and (n−1) balancing transformers for balancing currents in two gas discharge lamps. The load circuit further has for each gas discharge lamp at least one d.c. current supply line, connected between an output side terminal of a corresponding balancing transformer winding and gas discharge lamp and via which there is delivered to each gas discharge lamp a d.c. current, so as to avoid an unintended extinguishing of a lamp.

Abstract: The invention relates to a control circuit for at least one light-emitting diode (1) for adjusting the current and/or the voltage of the light-emitting diode (1) to a desired value adjusted by means of a controller (3), the current, the voltage and/or the luminescence of the light-emitting diode (1) being detectable and comparable with the desired value.

Abstract: An electronic ballast for at least one gas discharge lamp (LA) comprises a rectifier circuit (2) connectable to an a.c. voltage source (U0), a smoothing circuit (3), connected to the output of the rectifier circuit (2), for generating an intermediate circuit voltage (Uz), and an inverter (4) fed with the intermediate circuit voltage (Uz), at the output of which inverter a connection for the load circuit (5) containing the lamp (LA) is connected. The smoothing circuit (3) is constituted by a switching regulator and the ballast further has a control circuit (6) which detects the intermediate circuit voltage (Uz) and controls a controllable switch (S1) of the switching regulator in dependence upon the value of the intermediate circuit voltage (Uz).

Abstract: A circuit and a method for controlling light emitting diodes (D1, D2) for illumination involve an inverter whose output frequency can be varied. The inverter includes two electronic switches (S1,S2) which convert an applied direct current voltage (Uo) into an alternating voltage. A load circuit is connected to the output of the inverter and includes a resonance element and at least one light emitting diode (D1, D2) whose brightness is controlled by altering the output frequency of the inverter.

Abstract: An electronic ballast which includes a resonant load circuit (L1, C1) in series with a discharge lamp (LA), the resonant load circuit being supplied by an inverter (S1, S2) which outputs variable alternating voltages at frequencies above 200 KHZ. Alternatively, an electronic transformer incorporates a load circuit and a variable output frequency inverter for operating a low volt halogen lamp (7) at variable alternating frequencies above 200 KHZ. Passive components of the ballast and transformer are integrated into a multilayer circuit (13).