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Method and device for driving a gas discharge lamp

A technology for driving gas and discharge lamps, applied in the fields of driving gas discharge lamps and high-intensity discharge lamps, which can solve problems such as long commutation time, large capacitors, and large current ripples, and achieve the effect of reducing power contribution

Inactive Publication Date: 2009-10-28
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in this design there is a relatively large current ripple when commutating DC is generated, so this driver includes a capacitor in parallel with the lamp, which must be relatively large in order to reduce said ripple
On the other hand, the time required for commutation depends at least in part on this capacitor, a larger capacitance will result in a longer commutation time

Method used

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  • Method and device for driving a gas discharge lamp
  • Method and device for driving a gas discharge lamp
  • Method and device for driving a gas discharge lamp

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Embodiment Construction

[0021] The invention will be explained below in particular for the case of a lamp driver of the HBCF type, but it should be noted that the invention is not limited to drivers of this design, but can be applied to other driver types which can also provide advantages.

[0022] figure 1 is a block diagram schematically showing an exemplary lamp driver 10 for driving a gas discharge lamp 11 according to the prior art. The lamp driver 10 has a half bridge forward commutation design which should be known to those skilled in the art. Two switches M1 and M2 are arranged in series with corresponding diodes D1 , D2 between two voltage rails coupled to a substantially constant voltage source V. The design of this voltage source is not relevant to the invention. Two capacitors C1 and C2 are also arranged in series between the two voltage rails. A lamp 11 is coupled between the junction between said two switches M1 and M2 on the one hand and the junction between said two capacitors C1 a...

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PUM

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Abstract

A method is described for driving a gas discharge lamp (11) with commutating lamp current, wherein the lamp current has an average commutation frequency (1 / T0), the lamp current preferably having constant magnitude. In order to counteract the excitation of acoustic resonances, the phase (C) of the commutation moments is randomly modulated.

Description

technical field [0001] The present invention generally relates to a method and apparatus for driving a gas discharge lamp with alternating lamp current. The invention particularly relates to driving high intensity discharge lamps (HID), ie high pressure lamps such as high pressure sodium lamps, high pressure mercury lamps, metal halide lamps and the like. The present invention will be explained specifically for HID lamps, but the application of the present invention is not limited to HID lamps, and the present invention can generally be applied to other types of gas discharge lamps. Background technique [0002] Gas discharge lamps are known in the art, so a detailed explanation of gas discharge lamps is not required here. Suffice it to say that a gas discharge lamp comprises two electrodes located in a closed vessel filled with an ionizable gas or vapour. The containers are usually made of quartz or ceramics, in particular polycrystalline alumina (PCA). The electrodes ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/288
CPCY02B20/202H05B41/2888Y02B20/00
Inventor R·奥特
Owner KONINK PHILIPS ELECTRONICS NV