说明：  该系统以AT89C51单片机为核心实现温度控制。温度信号由AD590和温度/电压转换电路获得，温度实时控制采用PID算法，控制输出采用PWM波触发可控硅来控制加热通断。使系统具有较高的测量精度和控制精度。
(The system AT89C51 microcontroller as the core temperature control. Temperature signal obtained by the AD590 and temperature/voltage conversion circuit, real-time temperature control using PID algorithm to control the output PWM wave-triggered thyristor to control the heating off. The system has a high measurement and control accuracy.)