1、 i 开关电源系统设计 摘 要 随着电力电子技术的发展，电子设备的种类越来越多，电源在各个 系统中的核心作用日趋明显。另外，电子设备的小型化和低成本化促使 电源向轻、薄、小和高效率方向发展。基于这个思想设计了一款低功率 易控制的开关稳压电源，以满足小型电子设备的供电需要。 系统的实现是基于PWM波控制下的DC-DC转换原理。系统以单片 机MSP430F169为控制核心，采用SG3525PWM脉宽控制器实现对Boost 升压斩波电路稳压输出。 系统硬件部分主要包括： 整流滤波电路、 Boost 斩波电路、PWM波形产生与控制电路、采样电路、保护电路、单片机 最小系统等。软件包括：键盘控制模块、A
2、/D电压和电流采集模块、调 整模块、显示模块等几个部分。 系统能够实现电压输出在3036V范围内可调，输出电流最大可达 2A，电压调整率小于3%，效率达83.7%。系统具有电压键盘设定和输出 显示功能，同时具有过压、欠压和过流保护功能。 关键词：开关电源，单片机MSP430，PWM控制芯片，DC-DC变换 ii Switching Power Supply Design Abstract Along with the development of the power electronic technology, the kinds of electronic equipment have be
3、en more and more, power supplys core role in every system has become increasingly obvious. In addition, the miniaturization and low cost of electronic equipment turn power to the direction of light, thin, small and high efficient. Based on this idea, the design has designed a low-power and easy cont
4、rolled switching power supply to meet the power supply needs of small-scale electronic equipment . System implementation is based on the DC - DC conversion principle which is under the control of PWM waves. System to single-chip microcomputer MSP430F169 as the control core, using SG3525PWM pulse-wid
5、th controller to achieve Boost chopper circuitoutput voltage stable. System hardware includes: rectifier filter circuit, Boost chopper circuit, PWM waveform generation and control circuit, sampling circuit, protection circuits, thesingle-chip microcomputer minimize system. Software includes: keyboar
6、d control module, the voltage and current A / D acquisition module, adjusting module, display module, and several other parts. System can realize output voltage at the range of 30 36V adjustable, output current is up to 2A, Voltage adjustment rate is less than 3%, efficiency of 83.7%. System has the function of voltage keyboard settings and output display, but also has overvoltage, undervoltage, and overcurrent protection. Keywords: switching power supply, microcontroller MSP430, PWM cont
