高效率数控电源设计报告.docVIP

高效数控恒流电源 摘要 随着低碳经济时代的到来，提高能源利用率对工业和社会发展起着重要的作用。基于此本文描述了高效率数控恒流电源的设计原理和实现方法，本系统采用DC/DC变换器芯片TPS5430，它是一款高效的电源开关控制芯片，输入电压范围宽，输出电流高达3Ａ。以MSP430F247单片机为主控制器，通过键盘来设置电源的输出电流，设置步进等级为1mA，并可由液晶显示器显示实际输出电流值和负载功率。本系统还具有开路检测和过压保护功能，可广泛应用于需要高效恒流源的领域。 关键词：MSP430F247单片机 DC/DC变换器 高效恒流源 Abstract This paper describes the design of high-power LED power supply principle and method to MSP430F247 microcontroller-based controller, DC power through the keyboard to set the output current, set the step level as 1mA, and the actual output current value and load power can be displayed by the LCD . This system uses DC / DC converter chip TPS5430, the output power MOS tube can expansion the current . Single Chip Programmable output digital signal, through D / A converter (TLV5618) output analog, through the operational amplifier isolation amplifier, and precision voltage sampling resistor collection enlarged compared to control DC / DC converters feedback side, to achieve the output current control. Output current through the current / voltage changes, the adoption of A / D converter chip, real-time into the analog data, and then analyzed by microcomputer processing, the feedback through the form of data links, so that current is more stable, it constitutes a stable voltage-controlled current source. Actual test results show that the system output current stability, with the load and ambient temperature changes and high Jing Du, output current error of ± 5mA, output current at 20mA ~ 2000mA Fan Wei can be arbitrarily set within, output efficiency up to 90 %, and thus the actual applications requiring high stability and high efficiency constant current field. Key words: MSP430F247 MCU DC / DC converter efficiency constant current source  目录 一：方案设计与论证 1.1总体设计方案与比较： 方案一：采用以89C51为核心的单片机系统来控制12位AD7521的数据的输入并将其转换成模拟量输出同时单片机把输入的预值电流送数码管显示，再根据输出的电压量来控制电流的变化，此方案的优点是输入的预值电流信号稳定且避免了大量的数据存储，缺点是电路效率低。其电路方框图如图1.2所示： 图1.2 方案二方框图 方案二：采用开关电源控制芯片TPS5430，该芯片其内部集成110毫欧的MOS开关管，效率高达95%，输出电流最高3A,能够满足题目的要求。该芯片固定为50