Circuit arrangement for short-circuit detection in diodes, lighting arrangement and method for detecting a short circuit in diodes

摘要

In an embodiment, a circuit arrangement for short-circuit detection in diodes has a first terminal (1a, 1b) for connection to a voltage source (PS), a second terminal (2a, 2b) for connection to a first current sink (CS1), and a third terminal (CS1). 3) for supplying a potential signal (S1), wherein a first diode string (CH1) is connectable to the voltage source (PS) on the anode side and to the first current sink (CS1) on the cathode side, wherein the third terminal (3) is connected by means of a resistor (Rm ) can be coupled to the first diode string (CH1) on the cathode side. Furthermore, the circuit arrangement comprises an adjustable reference current sink (CSref), which is coupled to the third terminal (3) and is set up to generate a reference current (Iref), and a comparison unit (Cmp), which is coupled to the third terminal (3) on the input side and is adapted to provide a short circuit detection signal (KS1) in response to a difference between the potential signal (S1) and an adjustable reference voltage (Vref). In this case, the potential signal (S1) can be supplied as a function of a first short-circuit voltage (VS1) at the first diode string (CH1) and the reference current (Iref).