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电源模块的作用就是电压的转换，它可以将交流或直流电变换成你所需要的交流或直流电。如:将市电220V交流电(AC)转换成5V直流电(DC)，因为交流220V的电是高压电，而电子产品是低压供电的，这就需要一个转换装置，将交流220V的电压转换成低压，再比如在机动车里有时需要转换成220V交流电来使用，那么这会就成了低压转高压了，因为机动车的电压一般都比较低简而言之就是类似手机充电器一样，你的手机没电了，要插电或充电才能正常使用，但是你不能直接接220V使用，因为这样手机就会烧毁，因此就需要一个专门的转换装置来转换成手机所需的电压。

如何选择合适的电源模块

1、电路设计原理和工艺

电路原理的好坏分辨通常只能以专业角度着手，现阶段电源模块大体可分为裸板和灌封两种，裸板可以根据直观的方式，如电子元器件的布局合理整齐有序、大方、有序、焊点亮净挺拔，而灌封式模块，就没法查看内部的情况，但是由于不外露，在安全性和性能指标层面要好很多，焊接工艺可包括手工焊接与波峰焊工艺，机械化生产的波峰焊工艺品质要优于手工焊接

2、芯片的元器件

电源的核心就是IC，它犹如电源的大脑一样，IC的好坏直接影响着电源的各项参数。

3、变压器元器件

决定电源的功率、耐温等则是变压器。变压器负责完成交流电-直流电，能量超载就会饱和炸机4、电解电容和陶瓷电容

电解电容，和独石胆电解电容，它采用硫酸做绝缘介质，可以将较大的容量做成较小的体积，并在上面标有+的符号，有的标有-的符号，一般做低频交联和旁路滤波用，缺点是介子损耗大一些，独石电解电容，由于采用待殊的材料，性能优于普通电解，频率特性较好，但容量不能做的太大，可用于精确地电路中，如振荡、或定时电路

陶瓷电容有瓷介电容、瓷片电容、瓷管电容、陶瓷半可变电容几种。主要是无极性，介质材料较好，容量不能做的太大，适用高频电路。

The function of the power module is to convert voltage, which can convert AC or DC power into the AC or DC power you need. For example, converting 220V AC from mains power to 5V DC requires a conversion device to convert 220V AC into low voltage. For example, in motor vehicles, sometimes it is necessary to convert 220V AC for use, which becomes a low voltage to high voltage, Because the voltage of motor vehicles is generally low, which is similar to a mobile phone charger. Your phone is out of battery and needs to be plugged in or charged to function properly. However, you cannot directly connect it to 220V, as it will burn out. Therefore, a specialized conversion device is needed to convert it to the voltage required for the phone.

How to choose a suitable power module

1. Circuit design principles and processes

The distinction between good and bad circuit principles can usually only be approached from a professional perspective. At present, power modules can be generally divided into bare boards and encapsulated ones. Bare boards can be arranged in an intuitive way, such as the layout of electronic components being reasonable, orderly, generous, and orderly, with bright and straight solder joints. Encapsulated modules, on the other hand, cannot view the internal situation, but due to not being exposed, their safety and performance indicators are much better, Welding processes can include manual welding and wave soldering, and the quality of wave soldering processes produced by mechanization is superior to manual welding

2. Chip components

The core of a power supply is the IC, which is like the brain of a power supply. The quality of the IC directly affects the various parameters of the power supply.

3. Transformer components

The transformer determines the power and temperature resistance of the power supply. Transformers are responsible for completing alternating current and direct current, and energy overload will saturate and explode the machine. 4. Electrolytic capacitors and ceramic capacitors

Electrolytic capacitors, as well as single stone electrolytic capacitors, use sulfuric acid as the insulation medium, which can make larger capacities into smaller volumes and are marked with a+symbol or a - symbol. They are generally used for low-frequency cross-linking and bypass filtering, but the disadvantage is that the meson loss is higher. Single stone electrolytic capacitors, due to the use of special materials, have better performance than ordinary electrolysis and better frequency characteristics, but the capacity cannot be too large, Can be used in precise circuits, such as oscillation or timing circuits

Ceramic capacitors include ceramic dielectric capacitors, ceramic chip capacitors, ceramic tube capacitors, and ceramic semi variable capacitors. Mainly non-polar, with good dielectric materials, the capacity cannot be too large, suitable for high-frequency circuits.