开关电源技术属于电力电子技术，它运用功率变换器进行电能变换，通过变换电能，可以满足各种用电要求。由于其高效节能可带来巨大经济效益，因而引起社会各方面的重视而得到迅速推广。 

以AC-DC的变换为例，与传统采用工频变换技术的相控电源相比，采用大功率开关管的高频整流电源，在技术上是一次飞跃，它不但可以方便地得到不同的电压等级，更重要的是甩掉了体大笨重的工频变压器及滤波电感电容。由于采用高频功率变换，使电源装置显著减小了体积和重量，而有可能和设备的主机体积相协调，并且使电性能得到进一步提高。 

开关电源的使用为国家节省了大量铜材、钢材和占地面积。由于变换效率提高，能耗减少，降低了电源周围环境的室温，改善了工作人员的环境。我国邮电通信部门广泛采用开关电源极大地推动了它在其它领域的广泛应用。值得指出的是，近两年来出现的电力系统直流操作电源，是针对国家投资4000亿元用于城网、农网的供电工程改造、提高输配电供电质量而推出的，它已开始采用开关电源以取代传统的相控电源。国内一些通信公司均已相继推出系列产品。 

目前，国内开关电源自主研发及生产厂家有300多家，形成规模的有十多家。国产开关电源已占据了相当市场，一些大公司自主开发的电源系列产品已获得广泛认同，在电源市场竞争中颇具优势，并有少量开始出口。

Switching power supply technology belongs to power electronic technology. It uses power converter to transform electric energy. By changing electric energy, it can meet all kinds of electric requirements. Because of its high efficiency and energy saving can bring huge economic benefits, it has attracted the attention of all aspects of society and has been rapidly promoted.

Taking the AC-DC transformation as an example, compared with the traditional phase control power supply adopting the power frequency transformation technology, the high-frequency rectifier power supply adopting the high-power switch tube is a leap in technology. It can not only get different voltage levels conveniently, but also get rid of the bulky power frequency transformer and filter inductor capacitor. Due to the use of high frequency power conversion, the volume and weight of the power supply device is significantly reduced, and it is possible to coordinate with the host volume of the device, and the electrical performance is further improved.

The use of switching power supply for the country to save a lot of copper, steel and floor space. Due to the improvement of conversion efficiency and energy consumption, the room temperature around the power supply is reduced and the environment of the staff is improved. The wide use of switching power supply in China's Posts and telecommunications sector has greatly promoted its wide application in other fields. It is worth pointing out that in recent two years, the DC operation power supply of power system has been launched aiming at the national investment of 400 billion yuan for the transformation of urban and rural power supply projects and the improvement of the quality of power transmission and distribution. It has begun to use switching power supply to replace the traditional phase control power supply. Some domestic communication companies have launched a series of products.

At present, there are more than 300 domestic independent research and development and manufacturers of switching power supply, and more than 10 have formed scale. Domestic switching power supply has occupied a considerable market, and the series of power supply products independently developed by some large companies have been widely recognized, and have a considerable advantage in the power market competition, and a small number of them have begun to export.