Abstract: The invention relates a system for determining a change in a room (1). The invention comprises in particular a self-teaching illuminating system which detects a presence of an individual in an illuminated area. The system comprises lighting means (2) which output light, control means (3) which control the luminous output from the lighting means (2), measuring means (4) which determine a luminous intensity, and an evaluation means (6) which evaluates the luminous intensity determined by the measuring means (4). The evaluation means (6) is designed to detect a change of an object/individual in the room (1), starting from a determined luminous intensity at at least one first time, at which the lighting means (2) outputs no light, and a luminous intensity at at least one second time, at which the lighting means (2) outputs light.

Abstract: A PFC module is disclosed and contains an actively clocked PFC circuit (104) comprising at least one controlled switch (S1), and an integrated circuit (103) as a control unit which controls during a half-wave of the input voltage(Vin)of the actively clocked PFC circuit (104) the at least one switch(S1) of the actively clocked PFC circuit (104) with a fixed operating frequency in discontinuous current mode(DCM) The integrated circuit (103) sets the switch-on time (ton) of the at least, one switch (S1)dependent on the amplitude of the input voltage (VIN) of the actively clocked. PFC circuit (104), and keeps constant the switch-on time (ton) for at least two consecutive switching cycles within the half-wave of the input voltage (VIN), Also disclosed are a system containing the PFC module and a method for operating the PFC module.

Abstract: The invention relates to an intelligent PFC module comprising an actively clocked PFC circuit and a control unit which controls the actively clocked PFC circuit in discontinuous current mode (DCM), a system with an intelligent PFC module of said type, and at least one converter stage for the operation of an LED array, lighting devices with a PFC module of said type, and a system and method for the operation of a PFC module and system of said type.

Abstract: The invention relates a system for determining a change in a room (1). The invention comprises in particular a self-teaching illuminating system which detects a presence of an individual in an illuminated area. The system comprises lighting means (2) which output light, control means (3) which control the luminous output from the lighting means (2), measuring means (4) which determine a luminous intensity, and an evaluation means (6) which evaluates the luminous intensity determined by the measuring means (4). The evaluation means (6) is designed to detect a change of an object/individual in the room (1), starting from a determined luminous intensity at at least one first time, at which the lighting means (2) outputs no light, and a luminous intensity at at least one second time, at which the lighting means (2) outputs light.

Abstract: A voltage converter is proposed, for providing a DC voltage (Vout) for operating at least one LED strip (1), wherein the converter is configured to: a) output a DC voltage increasing or decreasing at least once, preferably in a voltage range lying above the flux voltage of the LED strip (1) while measuring the LED current (iL), and b) set the operating point of the DC voltage (Vout) as a function of this measurement.

Abstract: The invention relates to an LED module (1), comprising: connections (2) for an LED array (3); a circuit (4) which is configured to constitute a load, preferably an effective power load, if during a starting phase a constant current or a constant voltage is applied to the LED module (1), and which is configured not to constitute a load when the starting phase has finished, wherein the circuit (4) is designed to constitute a variable-current load which effects a change in the power consumption of the LED module (1) according to at least one predetermined protocol effected.

Abstract: A voltage converter is proposed, for providing a DC voltage (Vout) for operating at least one LED strip (1), wherein the converter is configured to: a) output a DC voltage increasing or decreasing at least once, preferably in a voltage range lying above the flux voltage of the LED strip (1) while measuring the LED current (iL), and b) set the operating point of the DC voltage (Vout) as a function of this measurement.

Abstract: The invention relates to an LED module (1), comprising: connections (2) for an LED array (3); a circuit (4) which is configured to constitute a load, preferably an effective power load, if during a starting phase a constant current or a constant voltage is applied to the LED module (1), and which is configured not to constitute a load when the starting phase has finished, wherein the circuit (4) is designed to constitute a variable-current load which effects a change in the power consumption of the LED module (1) according to at least one predetermined protocol effected.