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本文所讨论的温度控制系统有三个特点:(1)详细讨论了自激脉冲调宽的工作原理,这种设计简化了线路,对于提高控温精度起到了关键性的作用;(2)温差测量,变换和放大元件组合一起构成温度—电压变换式自激交流放大器,线路十分简单,温漂小、稳定性好,抗干扰性强,温度测量和变换灵敏度高;(3)采用可控硅作交流开关,并采用了过零触发,因此,对电磁设备干扰小,这是相移触发无法比拟的。
The temperature control system discussed in this paper has three characteristics: (1) The working principle of the self-excited pulse width modulation is discussed in detail. This design simplifies the circuit and plays a key role in improving the temperature control accuracy. (2) , Conversion and amplification components together form a temperature - voltage conversion type self-excited AC amplifier, the line is very simple, drift is small, good stability, strong anti-interference, temperature measurement and conversion sensitivity; (3) AC switch, and uses a zero-crossing trigger, therefore, the interference of electromagnetic devices is small, this is the phase-shift trigger unmatched.