直流电源的均流4.pdfVIP

ÿÿÿ 摘要 本文介绍了直流稳压电源的原理和设计：市电经功率变换后，分成既可相互 独立又可并联组合的两路直流稳压电源。该系统具有电路简洁，输出电压可调， 负载效应很小，电源效率高，稳定可靠的特点；当两路并联使用时能过自动均衡 电流，并具有由 89C51 单片机实现的过流保护及自动恢复功能。在芯片选 择上，我们选用了开关电源芯片TPS5430 和 load sharing 芯片 UCC29002 。利用 TPS5430 的4 脚 VSENSE 对地电压值能够稳定在 1.221V 的特性，将4 脚作为电 压参考点，通过与串联电阻分压网络相连接，实现5V 稳压输出。使用5 毫欧采 样电阻对两路并联电路进行电流采样，并选用两片load sharing 芯片 UCC29002 的配合使用，通过调节上路电路中连接在UCC29002 的 1 脚与 8 脚之间的电位器， 使上下两路对称，实现自动均流。 Abstract In this paper, the principle of direct current voltage-stable power supply is introduced，along with the design of it: after the power conversion, commercial power will be divided into two DC power supplies, which can be used not only in an independent way ,but also parallel and combined. The system has a simple circuit, an adjustable output voltage and the load effect is very small, the power efficiency is particularly high, stable and reliable; When one DC power supply parallels the other , the system is capable of achieving current-share function, with single chip 9C51 to achieve the over-current protection ,as well as automatic restoration of function. As for the chips to choose, we select the switching power supply chips TPS5430 and load sharing chips UCC29002. We make use of the features of TPS5430 that the VSENSE pin is able to be adjustable down to the value of the voltage of 1.221V ,and choose the VSENSE pin as a reference point, with the series resistance divider network connected to the chip, to achieve 5V output regulator. With the use of 5 milliohm sampling resistance to the two parallel circuits for current sampling, coupled with the choice of two load sharing chips UCC29002, we achieve the two-way symmetry and automatic current sharing by regulating the potentiometer connected to the CS- pin and the CSO pin. 一、作品简介 1、设计目标 设计并制作直流稳压电源，两路，并联输出，自动实现输出电路均衡。 2、详细指标要求 (1)输出特性要求