Control of the intensity of a LED lighting system
AssigneeBombardier Transportation GmbH
InventorsJean-Pierre Magalhaes Grave, Carl Lavertu, Daniel Lee
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Abstract
There is described a system and method for controlling the intensity of a lighting system for vehicles comprising light emitting diodes mounted on printed circuit boards (PCBs). The method comprises sending a first modulation signal to the lighting modules from a master controller upon detection of a presence of power from a power source by the master controller; and sending a second modulation signal to the lighting modules from the master controller upon detection of an absence of power from a power source by the master controller. The first modulation signal corresponds to a first LED intensity and the second modulation signal corresponds to a second LED intensity lower than the first light intensity.
Claims19
A lighting system connected to a power source, the lighting system comprising:
- lighting modules connected end-to-end and forming a row having a first line end a second line end, each lighting modules comprising light emitting diodes (LEDS);
- and
- a master controller electrically connected to the first line end, the master controller adapted to being powered by the power source, the master controller being operative to control an intensity of the LEDs by sending a first modulation signal and a second modulation signal to the lighting modules, the first modulation signal corresponding to a first LED intensity and the second modulation signal corresponding to a second LED intensity;
- wherein the first modulation signal is sent when the master controller detects a presence of the power source and the second modulation signal is sent when the master controller detects an absence of the power source.
A method for controlling an intensity of light emitting diodes (LEDs) installed on a lighting module, the method comprising:
- sending a first modulation signal to the lighting module from a master controller upon detection of a presence of power from a power source by the master controller;
- and
- sending a second modulation signal to the lighting module from the master controller upon detection of an absence of power from a power source by the master controller;
- wherein the first modulation signal corresponds to a first LED intensity and the second modulation signal corresponds to a second LED intensity lower than the first LED intensity.
Dependencies are inferred from the claim text.