摘要
针对LED照明驱动方案,提出一种带频率抖动功能的振荡器,包括一个主振荡器和一个辅助振荡器,通过线性改变主振荡器的充放电电流,使主振荡器频率线性变化,实现频率抖动。基于700 V BCD工艺,对电路的应用芯片进行仿真和流片。测试结果表明,设计的电路成功实现在中心频率55 kHz上下2.5 kHz范围内以250 Hz的速率抖动,可以减小电磁干扰对电源转换器系统的影响。
An oscillator with frequency jittering for LED lighting drive was proposed.This circuit contains a main oscillator and a minor oscillator.Frequency jittering was realized by linearly changing charge/discharge currents of the main oscillator,which caused the frequency to vary linearly.Based on 700 V BCD process,the circuit was simulated and fabricated.Test results showed that the circuit had a frequency jittering at 250 Hz within 2.5 kHz up and down the center frequency of 55 kHz,which might reduce effects of electromagnetic interference on power converter systems.
出处
《微电子学》
CAS
CSCD
北大核心
2011年第1期90-93,共4页
Microelectronics
关键词
LED照明
频率抖动
振荡器
电磁干扰
LED lighting
Frequency jittering
Oscillator
Electromagnetic interference
