Kurzschlusserkennung für Beleuchtungsschaltungen

Details

Veröffentlichungs-Nr.

EP2739119

Aktenzeichen

EP12195113

Anmeldetag

30. November 2012

Veröffentlichung

19. August 2015

Erteilung

19. August 2015

Rechtsraum

EP

IPC

H05B33/08

Abstract

This application relates to control circuits for lighting systems. In particular, it relates to control circuits for LED lighting systems with a feedback loop to regulate a drive voltage for the lighting system. A fault-tolerant controller (405) for a lighting system (400) is proposed comprising a plurality of light emitting diode "LED" circuits (401-1, 401-N) and a controllable power source (403) providing a drive voltage (404) to power the plurality of LED circuits (401-1, 401-N). The controller (405) comprises: a control unit (409) configured to cause regulation of said drive voltage (404) based on a determination of a plurality of feedback voltages (402-1, 402-N), one feedback voltage (402-1, 402-N) for each of the plurality of LED circuits (401-1, 401-N); a fault condition detecting means configured to identify one or more fault conditions from the plurality of feedback voltages (402-1, 402-N), wherein at least one of the LED circuits (401-1, 401-N) is determined as a fault circuit having a fault condition for which the respective feedback voltage (402-1, 402-N) is below a first fault-circuit condition threshold (493), the fault condition detecting means is further configured, in response to a detected fault condition, to apply a test voltage to a cathode of the fault circuit and if the feedback voltage of the fault circuit remains below a second fault-circuit condition threshold (493), the fault circuit is determined to have a short circuit condition and otherwise and open-circuit condition.

Anmelder

Firma

Dialog Semiconductor GmbH

Land

🇩🇪 Deutschland

Fachgebiete