火焰触发器用自适应信号处理电路设计

Adaptive Signal Processing Circuit Design for Flame Trigger

摘要:

为解决火焰触发器无法依据天空背景亮度自动调整电路增益,易于出现信号饱和和无信号输出的问题。基于乘法除法运算原理,本文设计了一种新型前馈型AGC电路用以扩大火焰触发器的动态范围。输入信号经峰值采集电路、过峰时刻判断电路、峰值保持电路、除法电路后生成增益控制电压,增益控制电压与经延时的原始信号相乘,实现对输入信号的自适应放大。经模拟实验验证,该电路可有效将80mV~1V范围内的模拟信号放大至5V,电路动态范围15dB~35dB、延迟时间100μs,输出信号信号幅值波动较小,最大误差小于5%。

Abstract:

In order to solve the problem that the flame trigger cannot automatically adjust the gain according to the sky background brightness, which usually result in the situation of signal saturation and no signal output. Based on the principle of multiplication and division, a novel feedforward AGC circuit is designed to expand the dynamic range of the flame trigger. The gain control voltage, which generates by a peak acquisition circuit, a peak over determination circuit, a hold circuit, and a division circuit, is multiplied by the delayed original signal to achieve adaptive amplification of the input signal. It is verified by simulation experiments that the circuit can effectively amplify the analog signal in the range of 80mV~1V to 5V. The dynamic range of the circuit is 15dB~35dB. The delay time is 100μs. The amplitude of the output signal fluctuates less. The maximum error is less than 5%.