基于STM32的数控电流源设计

摘要

电源技术尤其是数控电源技术是一门实践性很强的工程技术，服务于各个行业。随着计算机和通讯技术发展而带来的现代信息技术革命，给电源技术提供了广阔的发展前景，同时也给电源技术提出了更高的要求。现在市场上数控电流源的存在输出精度不高，功率密度比较低，带负载能力不强，体积大，价格较高，操作繁琐，工作状态不稳定等弊端，因此数控电源的主要发展方向是针对上述缺点不断改善。数字化智能电源模块是针对传统智能电源模块的不足提出的，数字化能够减少生产过程中的不确定因素和人为参与的环节数，有效地解决电源模块中诸如可靠性、智能化和产品一致性等工程问题，极大地提高生产效率和产品的可维护性。所以，高精度的数控直流电流源有很大的发展空间。在本设计中将采用STM32单片机为系统的主控制器,能够实现多功能、宽范围、可调节等诸多功能，为更好的实现恒流提供条件，完成数控电流源的设计。STM32片内集成的A/D转换器、D/A转换器和PWM发生模块降低了系统复杂程度，使系统简单，可靠，低价。

关键字：电源技术；数控电流源；STM32；数字化

ABSTRACT

Power technology, especially CNC power technology is one engineering technology with strong practice, it services for every field. Modern information technology revolution, that brought with the development of computer and communications technology, provides a broad development prospects, but also makes a higher demands in power supply technology. At the present time CNC current source on the market exists some shortcomings, such as output precision is not high, the power density is relatively low, capacity with a load is not strong, bulky, expensive, complicated operations, instability working state and so on. So the major develop direction of CNC power is specialized for these shortcomings, and to reform them. Digital intelligent power modules is made against the lacking of traditional intelligent power modules, digitize can reduce uncertainty and human participating quantity of links in the production process, and resolve some engineering problems effectively, such as reliability, intelligence, product consistency problem and so on, and greatly improve production efficiency and maintainability of the product. Therefore, high-accuracy CNC DC current source has a lot of space to develop. In this design,STM32 MCU will be used as the main controller of the whole system, it can achieve the multi-function, wide range ,adjustable, and many other functions, providing better conditions for achieving constant current and completing the design of CNC current source. It integrates A/D converter, D/A converter and PWM module in STM32 chip, thus reducing complexity of the system, keep the system simple, reliable and low price.

Key words:Power technology; Numerical control current source; STM32; digital

目录

摘要 (Ⅰ)

Abstract (Ⅱ)

第1章 (1)

1.1 数控电流源项目的目的和意义 (1)

1.2 数控电流源在国内外的发展概况 (2)

1.3 基于STM32的数控电流源的设计的内容 (4)

第2 章 (5)

2.1 数控电流源的核心技术原理 (5)

2.2 方案的总体设计 (6)

2.2.1 数控电流源的主控芯片的选择 (6)

2.2.2 基于STM32的数控电流源系统结构 (8)

2.2.3 恒流源模块电路的方案讨论 (9)

2.3 本章小结 (9)

第3章基于STM32数控电流源的硬件电路设计 (10)

3.1 恒流源模块电路的设计方案 (10)

3.1.1 以LM350A为恒流源模块的核心元件的恒流源电路 (10)

3.1.2 数控宽范围调整、大电流输出恒流源电路 (14)

3.2 数控部分 (16)

3.3 供电电源 (18)

3.3.1 三端稳压器 (18)

3.3.2 供电电源电路 (19)

3.4 本章小结 (20)

第4 章 (21)

4.1 主程序设计 (21)