开关电源利用现代电子电力技术控制功率开关管（MOSFET；三极管）的导

Switching power supply is a kind of power supply that uses modern electronic power technology to control the time ratio of power switch (MOSFET; transistor) on and off to maintain a stable output voltage. Switching power supplies are widely used in industrial automation control, power equipment, communication equipment, digital products and household appliances. The advantages of the switching power supply are mainly reflected in the relatively small power consumption, large power, relatively small size, wide voltage range and so on. <br>The main purpose of the design is to achieve a switching power supply used in daily life, such as TVs, computers, refrigerators and other commonly used electronic products require power. Today is the digital age, and it is very convenient to implement electronic products with a single chip microcomputer, so this design uses a single chip microcomputer. In this design, the difference between switching power supply and linear power supply is described in detail. Program demonstration, overall design, the expected output voltage value is preset by the keyboard, the output voltage is sampled by the analog-to-digital converter, and the output is performed by the corresponding pulse width software Control, pulse width modulation on the switching power supply to output the desired voltage. The PID algorithm is used to control the output voltage to be stable, and a 5V constant voltage output can be obtained. And attached with related circuit diagram.

开关电源利用现代电子电力技术控制功率开关管（MOSFET；三极管）的导通和关断的时间比率维持稳定输出电压的一种电源。开关电源广泛应用于工业自动化控制、电力设备、通讯设备、数码产品及家用电器等领域。开关电源的优点主要体现在功耗比较小，功率大、体积比较小、稳压范围宽等方面。<br>该设计的主要目的是实现一种日常生活中使用的开关电源，例如电视，电脑，冰箱和其他常用的电子产品都需要用到电源。如今是数字化时代，用单片机实现电子产品非常方便，因此本设计中使用了单片机。在本设计中，详细叙述了开关电源和线性电源之间的区别，程序演示，总体设计，预期输出电压值通过键盘预设，输出电压通过模数转换器采样，输出由相应脉冲宽度的软件进行控制，在开关电源上进行脉冲宽度调制，以输出期望的电压。采用PID算法控制输出电压稳定，可获得5V恒压输出。并附以相关电路图表示。

Switching power supply is a kind of power supply which uses modern electronic power technology to control the on and off time ratio of MOSFET (triode) to maintain stable output voltage. Switching power supply is widely used in industrial automation control, power equipment, communication equipment, digital products, home appliances and other fields. The advantages of switching power supply are mainly reflected in small power consumption, large power, small volume and wide voltage stabilizing range.<br>The main purpose of this design is to realize a kind of switching power supply used in daily life, such as TV, computer, refrigerator and other commonly used electronic products. Now is the digital age, it is very convenient to use single chip microcomputer to realize electronic products, so the single chip microcomputer is used in this design. In this design, the difference between switching power supply and linear power supply is described in detail, including program demonstration, overall design. The expected output voltage is preset by keyboard, the output voltage is sampled by analog-to-digital converter, the output is controlled by the corresponding pulse width software, and the pulse width modulation is carried out on the switching power supply to output the desired voltage. The output voltage is stable by PID algorithm, and 5V constant voltage output can be obtained. And attached with the relevant circuit diagram.<br>