频率调制在抑制声谐振中的应用

高强度气体放电灯中的声谐振现象阻碍了电子镇流器的推广应用。针对这一现象，在分析产生声谐振的必要条件的基础上，重点提出了利用前级有源功率因数校正电路的直流母线脉动电压的调制方案。该方案电路简单新颖，可利用其获得连续变化的开关频率。7年的使用实践表明，直流脉动电压频率调制技术对抑制声谐振现象十分有效。

Application of Frequency Modulation in Suppressing Acoustic Resonance

The acoustic resonance phenomenon in high intensity gaseous discharge lamps hinders the extension and application of electronic ballasts.With an aim at this problem,this paper suggests the modulation scheme with DC bus voltage ripple by using the front-end active power factor correct circuit based on the analysis of necessary conditions of producing acoustic resonances.The circuit of this scheme is simple and novel,which can be used to obtain the continuously variable switching frequencies.The 7 years' applicable practices indicate that the frequency modulation technology with DC bus voltage ripples is very effective to suppress(acoustic) resonances.