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Current demand control of lighting modules

A current and voltage technology, applied in the field of solid-state lighting, can solve the problem of not supporting the connection of multiple light engine modules

Inactive Publication Date: 2015-03-04
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] All known interfaces proposed so far cannot support multiple light engine module connections, in order to meet all the latest requirements, a new interface is proposed

Method used

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  • Current demand control of lighting modules
  • Current demand control of lighting modules
  • Current demand control of lighting modules

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0084] First Embodiment: Analog Circuit

[0085] The basic idea of ​​using a resistor to set the current is maintained, but the creative idea to exploit this basic idea is different. figure 1 The general parallel concept of current setting resistors is shown. Three light engine modules LEM connected to a power supply unit PSU are shown. This connection consists of three wires: LED+ for power, LED- for common ground, and CL for communication. Each light engine module contains at least one LED string. The LED string includes a plurality of LEDs. A plurality in the sense of the invention means that there are at least three LEDs connected in series. Each light engine module also includes a current setting resistor Rset. The current setting resistor is connected between the common ground LED- and the communication line CL. This results in a parallel connection of the respective current setting resistors Rset1 , Rset2 , Rsetm, so the power supply unit PSU measures the equiva...

no. 2 approach

[0146] Second Embodiment: Digital Circuit

[0147] First Alternative to the Second Embodiment: Another solution to the above problem is based on digitally designed circuits.

[0148] The circuit itself is shown in Figure 10: Figure 10a A schematic circuit of a light engine module LEM with a plurality of serially connected LEDs and a pulse generating unit PGU is shown. The pulse generating unit PGU comprises a series connection of switches and resistors between the communication line CL and the common ground LED-. The switch is driven by a pulse generator PG. The pulse generator generates pulses with respect to the current demand of the light engine module. The supply voltage of the pulse generator PG is derived from the supply voltage of the LEDs. This supply voltage can also be obtained from the LED string itself by tapping the LED string at the desired voltage.

[0149] Figure 10b A schematic circuit of a power supply unit PSU for delivering power supply current fo...

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Abstract

The invention is directed to a lighting system comprising a Power Supply Unit and at least one Light Engine Module, with an interface between the Light Engine Modules and the Power Supply Unit. The Light Engine Modules send pulses representing their current demand to the Power Supply Unit adjusting the output current accordingly. The Light Engine Modules are connected in parallel, and the pulse sequences are sent at the same time. Measures are taken to cope with interfered pulses.

Description

technical field [0001] The invention relates to the field of solid state lighting and describes the interface of a light engine module with its power supply unit and the corresponding power supply unit of the light engine module. The present invention generally relates to a power supply unit for driving one or more light engine modules, in particular a light engine module with a light emitting diode (LED) light source, and a lighting unit comprising a power supply unit and at least one light engine module. More specifically, the various inventive methods and apparatus disclosed herein relate to self-regulating power supply units for driving one or more light engine modules having light emitting diode (LED) light sources, and include self-regulating power supply units and at least A light engine module for LED-based lighting units. Background technique [0002] Lighting devices based on semiconductor light sources such as light emitting diodes (LEDs) offer a viable alternati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B33/0821H05B33/0806H05B33/0809H05B45/40H05B45/32
Inventor 理查德·迪尔格赖因哈德·莱谢勒
Owner OSRAM GMBH