CIRCUIT ARRANGEMENT FOR SHORT-CIRCUIT DETECTION IN DIODES, LIGHTING ARRANGEMENT AND METHOD THEREFOR

摘要

In one embodiment, a circuit arrangement for short-circuit detection in diodes comprises a first terminal (1a,b) for connection to a voltage source (PS), a second terminal (2a, 2b) for connection to a first current sink (CS1) and a third terminal (3) for supplying a potential signal (S1), wherein a first diode string (CH1) can be connected to the voltage source (PS) on the anode side and to the first current sink (CS1) on the cathode side, and wherein the third terminal (3) can be coupled to the cathode side of the first diode string (CH1) by means of a resistor (Rm). The circuit arrangement furthermore comprises an adjustable reference current sink (CSref) that is coupled to the third terminal (3) and designed for generating a reference current (Iref), as well as a comparison unit (Cmp) that is coupled to the third terminal (3) on the input side and designed for providing a short-circuit detection signal (KS1) in dependence on a difference between the potential signal (S1) and an adjustable reference voltage (Vref). In this case, the potential signal (S1) can be supplied in dependence on a first short-circuit voltage (VS1) across the first diode string (CH1) and in dependence on the reference current (Iref).

主权项

1. A circuit arrangement for the short-circuit detection in diodes, comprising
a first terminal (1a, lb) for connection to a voltage source (PS), a second terminal (2aX, 2bX) for connection to a first current sink (CS1), and a third terminal (3) for supplying a potential signal (S1), wherein a first diode string (CH1) can be connected 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) can be coupled to the cathode side of the first diode string (CH1) by means of a resistor (Rm), wherein the circuit arrangement furthermore comprises an adjustable reference current sink (CSref) that is coupled to the third terminal (3) and designed for generating a reference current (Iref) and a comparison unit (Cmp) that is coupled to the third terminal (3) on its input side and is designed for providing a short-circuit detection signal (KS1) in dependence on a difference between the potential signal (S1) and an adjustable reference voltage (Vref), and wherein the potential signal (S1) can be supplied in dependence on a first short-circuit voltage (VS1) across the first diode string (CH1) and in dependence on the reference current (Iref).