基于單片機的數控電流源設計

摘要：本文給出了一種基于單片機控制的數控電流源設計。本設計以PIC16F877A單片機為核心部件，采用PID算法實現了量程可選、輸出可調、步進精確、紋波電流極小的功能，而且可將輸出電流預置值、實測值在LED上同時顯示。經實驗測試證明，此設計具有較高的控制精度。 敘詞：PIC單片機 開關電源 電流源 D/A轉換 Abstract：A design of digital control current source controlled by a single chip is presented in this work. The design based on PIC16F877A single-chip and applied PID algorithm to achieve the functions of different measurement ranges, adjustable output current, exact step and very small current waviness. It also can display the output preset value and the measuring results by LED simultaneously. Test data shows that the design has high controlling precision. Keyword：PIC Single-chip, Switch source, Current source, D/A converter