Abstract:
In order to activate a control element (4) of a drive apparatus (1) for driving an object that can be moved between two end positions, said control element having a response delay (?tanspr), a parameter (Fakt) influenced by the drive apparatus (1) is monitored and compared with a specified threshold (FTh), upon the achievement of which a control signal is output to the control element (4); a pre-threshold (Fv) to be achieved before the achievement of the threshold (FTh) is defined, upon the achievement of which pre-threshold a pre-control signal is output to the control element (4) for the preparatory activation thereof, and afterwards further monitoring for the achievement of the actual threshold (FTh) is performed, wherein upon achievement of the actual threshold (FTh), the control element activation is retained, whereas if the actual threshold (FTh) is not achieved, the control element activation is rescinded.
Abstract:
The invention relates to a device (1) for supplying a plurality of LED units (3) with power, comprising a common DC/DC converter (4) which delivers a regulated output voltage and to which a plurality of strands (6) are connected, each having a buck converter (5) and an LED unit (3) connected thereto, and means (8) for regulating or setting the strand currents (I3) to be supplied to the LED units (3). In order to simplify the device, the means for regulating or setting the strand currents are formed by a central, common processor (10), which is supplied with actual values (7A) in keeping with the individual strand currents (I3) and connected to corresponding control inputs of the respective buck converters (5) for applying control values (8A) calculated on the basis of the actual values.