Emd Technologies Inc.

Other

Ge Lighting Solutions LLC

Giampaolo Carli

Robert Beland

An illumination system includes a master power supply providing power to several illumination modules. The master power supply is constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current loop. Each illumination module includes an electromagnetic coupling element and several light sources.

Illumination systems

A light emitting diode (LED) light source, LED driver circuitry and methods for controlling the brightness of an LED light source are presented. In some embodiments, an LED driver control circuit receives a dimming command signal to dim the LED light source, modulates a continuous direct current (DC) level to dim the LED light source, and determines that a predetermined threshold level has been reached. At this time, the process includes initiating a fixed pulse width generator (PWG) control signal having a fixed duty cycle, automatically adjusting the LED current amplitude to its nominal current level, and decreasing the current amplitude while the fixed PWG control signal is active to achieve commanded lower dimming of the LED light source.

Dimming control method and apparatus for LED light source

An illumination system includes a power supply having a boost converter operating in the discontinuous conduction mode, a flyback converter operating in the critical conduction mode, and a switch coupled to the flyback converter. Several light emitting diodes receive power from the power supply. The boost converter may include a boost inductor (L) and a boost diode (D), constructed to perform the boost power factor correction (PFC) function. The flyback converter may includes a flyback inductor (L) and a flyback diode (D) and the power supply may be constructed to turn on the switch around the point where the current flowing in the flyback inductor reaches zero value.

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Saint-Lazare, Canada

Giampaolo Carli