数控恒流源的设计-毕业论文

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1、 西南科技大学本科生毕业论文 I 数控恒流源的设计 摘要： 本设计是以压控恒流源为核心， STC89C52 单片机为主控制器的数控恒流源。该恒流源可通过键盘设定输出电流值，自动调整恒流输出，最大电流可达 2000mA，步进电流可达 10mA，并且设定值和实际测试值能够在数码管上显示。系统由稳压电源提供所需电压和键盘设定的电流值；系统具有实时反馈的功能，其工作过程如下：采样电阻的输出电压，经 A/D 转换器转换为数字信号，输入单片机进行处理调控，单片机处理后的数字信号，再经 D/A 转换器输出模拟信号，并由信号放大器隔离放大，控制功率三极管基极电压，从而输 出较稳定的电流。本系统适用于需要稳定性

2、较高的小功率恒流源领域。 关键词： 恒流源； 单片机； 稳压电源； A/D 转换器； D/A 转换器 西南科技大学本科生毕业论文 II Design of Numerical Control Constant Current Source Abstract： The design is based on voltage-controlled current source as the core, STC89C52 MCU-based controller, numerical control constant current source. The constant current sourc

3、e can set the output current value of the keyboard to automatically adjust the constant current output, maximum current up to 2000mA, the current step up to 10mA, and the set value and actual test values can be displayed in the digital control. System from the power supply to provide the required vo

4、ltage and current values set keyboard； system with real-time feedback function, and its working process is as follows: sampling resistor output voltage, after A / D converter is converted to digital signals, input single chip processor control, microcontroller processed digital signal, and then the

5、D / A converter output analog signals, amplified by the isolation signal amplifier, control the power transistor base voltage, and thus a more stable output current. This system is suitable for small power needs of high stability constant current source in the field. Key words: constant current source, SCM, regulated power supply, A / D converter, D / A Converter