| 带LED数字显示小型电子温控器的研制 |
| |
| 引用本文： | 李兆明. 带LED数字显示小型电子温控器的研制[J]. 河北工业大学学报, 1991, 0(3) |
| |
| 作者姓名： | 李兆明 |
| |
| 作者单位： | 河北工学院电气工程系 |
| |
| 摘 要： | 本文研制的无触点型电子温控器,全部选用集成电路,其温度传感器则选用SWF9热敏电阻。开停温差系用运算放大器来控制。时基电路NE555用来控制光电耦合器MOC3022,光电耦合器依次触发三端双向可控硅。将电压的变化,转变为温度的变化,是因电压与电阻成正比,并通过-增益可调的直流放大器来放大,因此输出电压能精确地反映温度在数值上的变化。然后通过3(1/2) A/D转换器7107和共阳极LED实现温度显示。
|
| 关 键 词： | 无触点 电子温控器 温度传感器 热敏电阻 开停温差 运算放大器 光电耦合器 三端双向可控硅 直流放大器 3 1/2 A/D转换器 共阳极LED |
The Development of a Small Type ElectronicTemperature Controller with LED Digital Display |
| |
| Li Zhaoming. The Development of a Small Type ElectronicTemperature Controller with LED Digital Display[J]. Journal of Hebei University of Technology, 1991, 0(3) |
| |
| Authors: | Li Zhaoming |
| |
| Affiliation: | Li Zhaoming |
| |
| Abstract: | The developed noncontacting electronic temperature controller is completely composed of integrated circuits with SWF9 thermister as its sensor of temperature. On-off temperature difference is controlled by an operational amplifier. And time-base circuit NE555 is used to control a photocoupler MOC3022, which in turn triggers a triple-ended bidirectional diode thyristor. The change of voltage to the temperature, which is propotional to that of the resistance, is amplified by a DC amplifier with adjustable gain, so that the output voltage exactly equals to the temperature change in value. On using a 3 1/2-bit A/D converter 7170 and a common-anode LED, the temperature is digitally displayed. |
| |
| Keywords: | Noncontacting Electronic temperature controller Temperaturesensor Thermistor On-off temperature difference Operational amplifier photocoupler Triple-ended bidirectionai diode thyristor DC amplifier Common-anode LED |
| 本文献已被 CNKI 等数据库收录！ |
|
