Search International and National Patent Collections

1. (WO2014204971) LONG LIFE, FAIL SAFE TRAFFIC LIGHT

Pub. No.:    WO/2014/204971    International Application No.:    PCT/US2014/042755
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Wed Jun 18 01:59:59 CEST 2014
IPC: H05B 37/03
Applicants: DIALIGHT CORPORATION
Inventors: HEBBORN, Kevin A.
ZINGLER, Glenn J.
Title: LONG LIFE, FAIL SAFE TRAFFIC LIGHT
Abstract:
The present disclosure is directed to a method for detecting a failure in a signal light. In one embodiment, the method includes monitoring operation of one or more light emitting diodes (LEDs) of the signal light coupled to a constant current driver, detecting a short circuit in at least one of the one or more LEDs and signaling a failure in the signal light when the short circuit is detected.