公开(公告)号：US4768378A

公开(公告)日：1988-09-06

申请号：US10794

申请日：1987-02-04

申请人： Yuzi Ando ,  Yuichi Mori ,  Hirokazu Tahara ,  Tatsuya Tsuda ,  Masato Nakatani ,  Masanobu Fujii

发明人： Yuzi Ando ,  Yuichi Mori ,  Hirokazu Tahara ,  Tatsuya Tsuda ,  Masato Nakatani ,  Masanobu Fujii

IPC分类号： G01N25/64 ,  G01N25/56 ,  G01W1/00

CPC分类号： H05B6/6458 ,  G01N25/56

摘要： A humidity detecting circuit for detecting the ambient humidity in a cooking chamber, which includes a constant current source, a first temperature-detecting resistor self-heated by the constant current source to detect the ambient humidity and having one terminal connected to an output terminal of the constant current source, and a second temperature-detecting resistor having one terminal connected to the one terminal of the first temperature-detecting resistor to detect the ambient temperature. An operational amplifier having an inverting input terminal, a noninverting input terminal and an output terminal is provided, the inverting input terminal being connected to the other terminal of the second temperature-detecting resistor so that the terminal voltage of the first temperature-detecting resistor may be inputted into the inverting input terminal through the second temperature-detecting resistor. A feedback resistor is associated with the operational amplifier and has one terminal connected to the output terminal of the operational amplifier and an other terminal connected to the inverting input terminal of the operational amplifier.

摘要翻译： 一种用于检测烹饪室中的环境湿度的湿度检测电路，其包括恒流源，由恒流源自加热的第一温度检测电阻器以检测环境湿度，并且具有一个端子连接到 恒流源和第二温度检测电阻器，其一端连接到第一温度检测电阻器的一端以检测环境温度。 提供了具有反相输入端子，非反相输入端子和输出端子的运算放大器，反相输入端子连接到第二温度检测电阻器的另一端子，使得第一温度检测电阻器的端子电压可以 通过第二温度检测电阻器输入到反相输入端子。 反馈电阻器与运算放大器相关联，并且一个端子连接到运算放大器的输出端子，另一个端子连接到运算放大器的反相输入端子。