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基于0.5μm BCD工艺,设计了一种频率可调的时钟振荡器。通过环路控制,该振荡器的频率可以跟随输入线电压频率的变化,二者之间满足定量关系。在TRIAC调光的LED驱动芯片中,随输入线电压频率变化的振荡器能够为导通角测量技术提供可靠的基础时钟。HSPICE仿真结果表明,输入线电压在50~60Hz范围内变化时,振荡器的频率可有效跟随其变化,误差小于2%。
Based on the 0.5μm BCD process, a frequency-adjustable clock oscillator is designed. Through the loop control, the oscillator frequency can follow the input line voltage frequency changes, to meet the quantitative relationship between the two. In TRIAC dimming LED drivers, oscillators that vary in frequency with the input line voltage provide a reliable base clock for conduction angle measurement. HSPICE simulation results show that when the input line voltage changes in the range of 50 ~ 60Hz, the oscillator frequency can effectively follow the change, the error is less than 2%.