Circuit arrangement for adapting LED arrangement characteristic drives switch element depending on operating voltage so sum of load and LED current is on defined characteristic

摘要

The arrangement has at least one series circuit in parallel with the LED arrangement and containing a load resistance and a controllable switch element. The switch element is coupled to an evaluation device that detects the LED arrangement operating voltage and drives the switch element so a load current flows in the load resistance and the sum of the load and LED currents lies on a current-voltage characteristic determined by external elements. The arrangement has at least one series circuit (3) in parallel with the LED arrangement (2) and containing a load resistance (RL) and a controllable switching element (T) whose electrical resistance in the on state can be controlled via a control input. The switch element is coupled to an evaluation device (4) that detects the operating voltage (UB) of the LED arrangement and drives the switch element accordingly so that a load current flows in the load resistance and the sum of the load current and LED current gives a current value on a current-voltage characteristic determined by external elements, especially monitoring devices. Independent claims are also included for the following: a LED signaling lamp, a light signal arrangement and a method of adapting the current flow through a LED signaling lamp to a defined characteristic.