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本发明涉及分析仪器领域,特别是一种电热消解仪,包括加热体,加热体通过加热主电路与交流电源连接形成加热回路,加热主电路包括依次串接的空气断路器、单相全桥整流滤波单元和Buck主电路;还包括设置在加热体上的温度传感器,温度传感器通过滤波放大单元分别与单片机和PWM控制驱动单元,单片机与PWM控制驱动单元相连接,PWM控制驱动单元通过隔离驱动单元与Buck主电路相连接;PWM控制驱动单元通过采样电阻对加热回路中电流采样;单片机的输出端连接有显示温度的输出设备,输入端连接有参数设定的输入设备。采用上述结构后,本发明的电热消解仪采用功率开关管,实现输出功率的精确调节,继而可以实现加热过程的精确控制。
The present invention relates to the field of analytical instruments, in particular to an electrothermal digestion apparatus comprising a heating body, wherein the heating body is connected with an alternating current power source through a heating main circuit to form a heating circuit, the main heating circuit comprises an air circuit breaker, a single-phase full-bridge rectifier A filter unit and a Buck main circuit. The temperature sensor further comprises a temperature sensor arranged on the heating body. The temperature sensor is respectively connected with a singlechip and a PWM control driving unit through a filter amplifying unit, the singlechip and the PWM control driving unit, and the PWM control driving unit is connected through an isolation driving unit And the main circuit of the Buck is connected; the PWM control and driving unit samples the current in the heating circuit through the sampling resistor; the output of the microcontroller is connected with an output device for displaying the temperature; the input end is connected with an input device with parameter setting. After adopting the structure, the electric digestion instrument of the invention adopts the power switch tube to realize the precise adjustment of the output power, and then the precise control of the heating process can be realized.