高强度气体放电电子镇流的非线性频率调制

Nonlinear Frequency Modulation in Electronic Ballast for High Intensity Discharge

研究表明,高强度气体放电灯高频工作且具备适当的激励频率和足够的能量时,会产生声谐振现象。在脉冲宽度调制频谱分析的基础上,提出了非线性频率调制方法,分散输出电流频谱,减小各频率分量的振幅,降低激励能量;同时使得调制频率非线性变化,防止离子声波在固定频率点上产生驻波,从而抑制声谐振。文章也给出了实现方法和测试结果。

It is showed that the acoustic resonance phenomena would happen in high intensity discharge lamps working in high frequencies with appropriate exciting frequencies and enough energies at the same time. Based on the spectrum analysis of pulse width modulation, nonlinear frequency modulation is presented to spread the output current specta, to lessen the amplitudes of different frequencies, and to reduce the exciting energies, while the modulation frequency is changed nonlinearly to prevent the plasma acoustic waves from being the standing waves at some frequencies, and then suppresses the acoustic resonances. Experimental approaches and test results are given out in this paper.