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A system for feeding light sources subject to dimming and corresponding method

A light source and dimmer technology, applied in the direction of light source, electric light source, electrical components, etc.

Inactive Publication Date: 2010-09-22
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A problem that arises in the use of dimmers with electronic transformers for e.g. halogen lamps is the possible interaction with the input filter stage of the ECG

Method used

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  • A system for feeding light sources subject to dimming and corresponding method
  • A system for feeding light sources subject to dimming and corresponding method
  • A system for feeding light sources subject to dimming and corresponding method

Examples

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Embodiment Construction

[0023] figure 1 is used for power supply voltages from such as for example 240Vrms supply voltage V m Schematic illustration of the configuration for feeding a light source such as a halogen lamp L that is started.

[0024] In the exemplary embodiment shown, the light source L is fed via a self-oscillating half-bridge 10 . The self-oscillating half-bridge 10 constitutes the heart of an ECG (Electronic Control Gear) for powering the light source L, ie feeding power.

[0025] The power fed to the light source L (and thus, the brightness of the light source L) is selectively controlled via the dimmer 12 . In an embodiment, the dimmer 12 is of the leading edge type as discussed in the introductory part of this specification.

[0026] The output of the dimmer 12 is connected to the input of the self-oscillating half-bridge arrangement 10 via an input filter 14 . In the exemplary embodiment shown, the input filter is a so-called "Π" (Greek letter pi) filter configuration compris...

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Abstract

A system for feeding a light source (L) such as a halogen lamp (L) via a bridge arrangement (10) having an input filter (14) for connection to a dimmer (12). The system includes a resistor (Rl) for coupling to the input filter (14) in order to form a snubber circuit in order to prevent oscillations of the input filter (14) and the bridge arrangement (10). The system including a switch (Sl) sensitive (16, SB) to the load on the bridge arrangement (10) to selectively couple the resistor (Rl) to the input filter (14) when the load on the bridge arrangement (10) is below a given threshold.

Description

technical field [0001] The invention relates to an arrangement for feeding power to a light source. [0002] The invention was developed by paying particular attention to the possible use of the invention in connection with halogen lamps which are subject to dimming. However, the field of application of the invention is by no means limited to this possible application. Background technique [0003] An electronic dimmer is a device for adjusting the brightness of a light source (eg, a lamp such as a halogen lamp or a light emitting diode or LED) by reducing or increasing the average power fed to the light source. [0004] Dimmers for halogen lamps are often referred to by the acronym ECG (Electronic Control Gear). According to the ECG's operating mechanism, ECGs can be divided into two main categories: trailing edge dimmers and leading edge dimmers. [0005] Trailing edge dimmers regulate the power delivered to the lamp by cutting the sinusoidal supply voltage during the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/392
CPCY02B20/142H05B39/045Y02B20/00
Inventor 拉法埃莱·皮瓦
Owner OSRAM GMBH
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