基于单片机的可调压电源设计.docVIP

应用电子技术 题 目： 系部名称： 专业班级： 学生姓名： 学 号： 指导教师： 教师职称： 2012 年月摘 要 现实的生活和实验中,常常要用到各种各样的电源,电压要求多样。在市面上,各种电源产品各式各样,有可调节的和固定的。但是普遍存在一些问题,如转换效率低,功耗大,输出精度不高,可调节范围过小,不能满足特定电压的要求,输出不够稳定,纹波电流过大,并且普遍采用可调电阻器调节,操作难度大,易磨损老化。随着各种电器和仪表设备的日渐丰富，对电源应用的灵活性提出了更高的要求。设计一款使用灵活、方便且价格相对便宜的通用电源，正越来越成为市场所需。现代单片机正朝着处理速度越来越快，外设资源越来越丰富，价格越来越便宜的方向发展，将单片机融入电源的设计中可以极大地提升电源的性能和灵活性。本文介绍了一种PIC16F874单片机加PWM芯片NCP1200的开关电源设计方法，既可以保留PWM芯片带来的稳定工作性能，又可以利用单片机的控制能力提供各种人机交互和通信接口。设计的电源作为通用电源使用，可以提供灵活可编程的电压电流输出，另外还可以设置成铅酸电池充电器的模式，具有广阔的应用前景。 在确定了系统总体设计方案的基础上，选择了合适的芯片，并进行硬件电路设计，系统软件设计。同时利用绘制出，仿真结果也验证了本的正确性和实用性。PWM芯片NCP1200，PIC16F874单片机，Adjustable DC Regulated Switching Power Supply Base On Single-chip Microcomputer Abstract In real life and experimental, often use a variety of power supply, voltage requirements, and diverse.?How to design a voltage stability, high output voltage accuracy, and adjust the range of voltage sources, into a hot spot of electronic technology application.?In the market, various power supplies product variety, with adjustable and fixed.?But there are some common problems, such as the low conversion efficiency, power consumption, output accuracy is not high, adjustable range is too small and does not meet the requirements of a specific voltage, output stable enough, excessive ripple current and generally adjustable resistor is used to regulate, the operation difficult, easy to wear and aging.With all the appliances and instrumentation equipment are increasing, the flexibility of the application of power supply put forward higher request design a flexible and convenient to use and cheaper universal power supply, is becoming more and more a microcontroller is moving toward the market need modern processing speed more and more quickly, peripherals resource is more and more abundant, the price is cheaper and cheaper the direction of development, will be in the design of the single chip microcomputer power can greatly improve the performance of the power and flexibility. This paper