Circuit arrangement and method for operation of a high-pressure discharge lamp below its nominal power
A technology of high-pressure discharge lamps and rated power, which is applied in lighting devices, electric light sources, electrical components, etc., and can solve problems such as electromagnetic interference
Inactive Publication Date: 2013-07-10
OSRAM GMBH
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Problems solved by technology
This instability when commutating sometimes causes significant EMI
Method used
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[0030] figure 1 Shows the change in lamp current when the diffuse point transition is extremely weak at rated power (curve 10) and the change in lamp voltage when the diffuse point transition 122 is strong in dimming operation (53% of rated power, curve 12 ), where the time resolution is 10μs / Div.
[0031] figure 2 show figure 1The lamp current change when the diffuse point transition of the signal is extremely weak at rated power (curve 20) and the lamp current change when the diffuse point transition is strong during dimming operation (53% of rated power, Curve 22), where the time resolution is 10 μs / Div. These two figures make clear the problem on which the invention is based. In dimming operation, the electrodes become too cold and problems arise when switching from diffuse arc operation to spot arc operation at each commutation, i.e. diffuse as mentioned above Point shift 121 or 221. This can be clearly observed in curves 12 or 22 , in which a strong jump occurs in...
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The invention relates to a method for operation of a high-pressure discharge lamp below its nominal power, wherein the high-pressure discharge lamp is operated at the nominal power level with an alternating current at a predetermined operating frequency, and the lamp voltage is measured during one half-cycle, at least at the start of a half-cycle and at the end of a half-cycle, with the following steps: - reduction of the instantaneous operating frequency below an upper limit, - changing the current waveform of the alternating current to a current waveform which is in the form of a pitched roof and is dependent on the difference between the lamp voltages at the end and at the start of the half-cycle, in which the magnitude of the current |Istart| at the start of the half-cycles with respect to the magnitude of the current |Iend| at the end of the half-cycles behaves in a manner such as |Istart|:|Iend| = 1:1.2 ... 1:3.0. The invention likewise relates to a circuit arrangement for operation of a high-pressure discharge lamp below its nominal power, wherein the high-pressure discharge lamp is operated at the nominal power with an alternating current at a predetermined operating frequency, and the circuit arrangement carries out the method described above. ...
Description
technical field [0001] The invention relates to a method for operating a high-pressure discharge lamp with an alternating voltage and an alternating current at a predetermined operating frequency below the rated power of the high-pressure discharge lamp. Background technique [0002] The invention is based on a method for operating a high-pressure discharge lamp with an alternating current of a predetermined operating frequency below the rated power of the high-pressure discharge lamp according to the type of the independent claim. [0003] A different problem arises if the high-pressure discharge lamp, also referred to below as lamp, can be operated in dimmed mode. Practically all of the best-selling high-pressure discharge lamps are optimized with respect to their rated power, so that the plasma physics and heat balance of the lamp at rated power are optimized and have the highest efficiency. The power specified by the manufacturer of the lamp is to be regarded as the rat...
Claims
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Login to View More IPC IPC(8): H05B41/292
CPCH05B41/2928H05B41/38
Inventor 约阿希姆·米尔施勒格尔安德烈亚斯·克洛斯
Owner OSRAM GMBH