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本系统通过Z-80CPU中央微处理器及A/D、CTC等外围接口电路,利用热电偶进行温度检测,由毫伏放大环节及A/D转换器输入采样信号。微处理器将采样信号与给定温升曲线相比较,经过运算对炉温进行跟随控制,并随时显示现场炉温。 一、硬件设计 该系统灵活地利用具有定时和计数功能的CTC芯片来控制晶闸管导通角及采样周期,以直接产生晶闸管的触发脉冲信号,此外,对热电偶的微弱信号处理不是采用传统的温度变送器,而是利用精密运算放大器构成放大环节,以硬件处理方式将8位A/D转换精度
The system through the Z-80CPU central microprocessor and A / D, CTC and other peripheral interface circuit, the use of thermocouples for temperature detection, the millivolt amplification and A / D converter input sampling signal. The microprocessor compares the sampled signal with a given temperature rise curve, performs a follow-up control over the temperature of the oven, and displays the oven temperature at any time. First, the hardware design The system flexibility to use a timing and counting function of the CTC chip to control thyristor conduction angle and sampling period to directly generate the thyristor trigger pulse signal, in addition, weak signal processing thermocouples do not use the traditional temperature Transmitter, but the use of precision op-amp form an amplification part of the hardware processing methods will be 8-bit A / D conversion accuracy