Electronic circuit for supplying a high-pressure discharge arc lamp

An electronic circuit and high-voltage discharge technology, applied in the field of electronic circuits for powering high-voltage discharge arc lamps, can solve problems such as high-frequency interference peaks, high circuit current, and high costs

Inactive Publication Date: 2005-09-28
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This attenuated AC voltage requires a particularly high quality factor for the tuning circuits L2, C2, in connection with which the provision of these components is correspondingly expensive
Moreover, a high voltage and a low AC component are requir...

Method used

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  • Electronic circuit for supplying a high-pressure discharge arc lamp
  • Electronic circuit for supplying a high-pressure discharge arc lamp
  • Electronic circuit for supplying a high-pressure discharge arc lamp

Examples

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Embodiment Construction

[0032] It consists of two power transistors T 1 and T 2 , they are connected to the supply voltage U in a half-bridge circuit + And the circuit's reference potential 10. Two electrolytic capacitors C configured in series DC2 、C DC1 with the supply voltage at U + In parallel with the entire half-bridge circuit between the reference potential 10 of the circuit. Coil Tr with three taps filt The first terminal of is connected to the output 11 of the half-bridge circuit. Coil Tr filt The center tap is connected to the second coil L ign the first end of . Coil Tr filt of the remaining third tap, the external tap or terminal via capacitor C filt is directly connected to the reference potential 10 of the circuit. Coil Tr filt with capacitor C filt is dimensioned such that the frequency component at the output 11 of the half-bridge circuit dominates during normal operation of the circuit, and in coil Tr filt cancels at the center tap of , that is, it forms the blocking f...

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PUM

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Abstract

The invention relates to an electronic circuit and to a method of supplying a high-pressure discharge arc lamp (12). The circuit comprises a DC-AC converter, for which purpose two controllable switching elements T1, T2 are connected in the form of a half bridge to an operating potential U+ and a reference potential (10). The circuit further comprises a two-stage filter arrangement. The lamp is connected to a coil Lign of the second filter stage, and the same connection terminal of this coil Lign is connected to the reference potential (10) via a capacitor Cign. To make the circuit as small and as economical as possible, while high high-frequency interference peaks and strong currents in the circuit are avoided, it is proposed that a coil Trfilt of the first filter stage has at least three taps. The first, outer tap is connected to the output of the half bridge, the second, central tap to the second connection terminal of the coil Lign, and the third, outer tap to the reference potential (10) via a capacitor Cfilt.

Description

technical field [0001] The invention relates to an electronic circuit for powering a high pressure discharge arc lamp and a method for operating a high pressure discharge arc lamp with such an electronic circuit. Background technique [0002] High pressure discharge arc lamps are used eg in modern data and video projectors. They are very powerful and are characterized by a particularly short discharge arc. On the basis of the laws of optics, it is possible to make a projector with such a lamp and with a small optical system, which nonetheless has a high luminous efficiency, ie produces a bright image. This results in a significant reduction in the size and cost of the projector. [0003] At the same time, however, new demands are placed on the size and cost of the electronic components of such projectors. The basic electronic component here is the electronic power supply circuit and, in the case of high-pressure discharge arc lamps, also the ballast. [0004] The primary...

Claims

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Application Information

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IPC IPC(8): H05B41/24H05B41/288
CPCH05B41/288
Inventor P·吕尔肯斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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