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Driving method of metal halide lamp by acoustic resonance, system comprising high pressure discharge lamp and electronic lighting circuit, electronic lighting circuit for high frequency driving of high pressure discharge lamp
Driving method of metal halide lamp by acoustic resonance, system comprising high pressure discharge lamp and electronic lighting circuit, electronic lighting circuit for high frequency driving of high pressure discharge lamp
The method involves using a high frequency carrier frequency that is frequency modulated with a sweep signal and simultaneously amplitude modulated, whereby a fundamental frequency of the AM signal is first set that is derived from preferably the second longitudinal mode. It involves a preparation stage, conducting a measurement to define a characteristic field given by traversing stepwise varied degrees of AM in a maximum range of 5 to 45 per cant, deriving the optimum degree of AM from lamp impedance variations, searching a frequency associated with the optimal AM and deriving the operating frequency. Independent claims are also included for the following: (A) a system with a high-pressure discharge lamp and a voltage adapter (B) and a voltage adapter.
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