Circuit arrangement and method for operating a high-pressure discharge lamp
A high-pressure gas, circuit device technology, applied in the field of circuit devices, can solve the problem of high cost
Inactive Publication Date: 2012-03-14
OSRAM GMBH
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Problems solved by technology
If you consider building a power factor correction circuit here and building an ignition unit, an electronic driver with this topology requires at least 3 chokes and 7 to 8 switches, which makes the cost very high
Method used
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Embodiment Construction
[0059] figure 1 A circuit arrangement according to the invention is shown for generating an amplitude-modulated alternating current signal for operating a gas discharge lamp in a first embodiment with a half-bridge arrangement having a blocking capacitor. The circuit arrangement includes a concept in which a rectangular-wave-shaped current supply for the lamp can be generated, to which an amplitude modulation can be added, and in which the depth of the amplitude modulation can be infinitely adjusted with a software controller. A square wave signal has a very low frequency (around 50-150Hz), while a modulated signal has a high frequency that can be adjusted in the range of around 60kHz. The basic idea of the circuit arrangement is to control two MOS field effect transistors (field effect transistors), which can be increased to less than 5 when considering the general idea for an electronic drive with power factor correction circuit and ignition circuit. a MOS field effect ...
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The invention relates to a circuit arrangement for operating a high-pressure discharge lamp (5) having a straightened arc, comprising: at least one first (Q1) and one second electronic switch (Q2) in a first half-bridge (6); a supply voltage connection and a reference ground connection for supplying the half-bridge arrangement with a direct voltage signal (U0); a load circuit (9), which comprises a lamp choke (L1) and a blocking capacitor (7) and is coupled to the half-bridge center and to at least one connection for connecting the high-pressure discharge lamp (5); a triggering circuit (8) for providing at least one first (G1) and one second (G2) triggering signal for the first (Q1) and the second electronic switch (Q2), wherein the first and second triggering signal (G1, G2) are pulse width-modulated signals having the same frequency, wherein the pulse widths of the two triggering signals and the phase angles of the two triggering signals relative to each other can be set independently of each other, and the two triggering signals are each inverted in a low-frequency cycle. The invention further relates to a method for operating a high-pressure discharge lamp comprising a circuit arrangement described above, wherein the following steps are performed during the operation of the gas discharge lamp: triggering the first and second electronic switch using a first and second triggering signal, wherein the triggering signals are pulse width-modulated signals having the same frequency; varying or setting the pulse duty factors of the triggering signals; varying or setting the phase angle of the two triggering signals relative to each other; inverting the two triggering signals in a low-frequency cycle.
Description
technical field [0001] The invention relates to a circuit arrangement and a method for operating a high-pressure gas discharge lamp with a rectified arc, the circuit arrangement having in a first half bridge: at least a first electronic switch and a second electronic switch; A power supply port and a reference ground port for supplying a DC voltage signal to a half-bridge circuit; a load circuit with a lamp choke and a blocking capacitor and coupled on the one hand to the half-bridge midpoint and on the other hand to at least a port for connecting the high-pressure gas discharge lamp; and a trigger circuit for providing at least a first trigger signal and a second trigger signal for the first and second electronic switches. Background technique [0002] The invention proceeds from a circuit arrangement and a method for operating a gas discharge lamp according to the main claim. In particular, the invention relates to a circuit arrangement for operating a gas discharge lamp ...
Claims
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IPC IPC(8): H05B41/288H05B41/292
CPCH05B41/2881H05B41/2888H05B41/2928Y02B20/00H05B41/288H05B41/292
Inventor 赫伯特·卡斯特勒
Owner OSRAM GMBH