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本文较为清晰地分析了一种新颖的热敏电阻式温度-频率变换器的工作原理。这种变换器把热敏电阻间接地放在振荡器的正反馈支路中和一只最佳补偿电阻串联,然后通过把振荡器的输出变换成恒流源向热敏电阻提供电流来改变反馈比,从而改变输出频率。文章提供了用R_c=2.2KΩ的线性补偿电阻做实验获得的满意结果。最后还提出了进一步改进的设想方案。
This article more clearly analyzes the working principle of a novel thermistor temperature-frequency converter. This converter places the thermistor indirectly in the positive feedback branch of the oscillator in series with an optimal compensation resistor and then changes the feedback by converting the oscillator output to a constant current source to provide current to the thermistor Than, thus changing the output frequency. The article provides a satisfactory result obtained experimentally with a linear compensation resistor of R_c = 2.2KΩ. Finally, some suggestions for further improvement are put forward.