開關(guān)電源技術(shù)屬于電力電子技術(shù)，它運(yùn)用功率變換器進(jìn)行電能變換，通過變換電能，可以滿足各種用電要求。由于其高效節(jié)能可帶來巨大經(jīng)濟(jì)效益，因而引起社會各方面的重視而得到迅速推廣。
以AC-DC的變換為例，與傳統(tǒng)采用工頻變換技術(shù)的相控電源相比，采用大功率開關(guān)管的高頻整流電源，在技術(shù)上是一次飛躍，它不但可以方便地得到不同的電壓等級，更重要的是甩掉了體大笨重的工頻變壓器及濾波電感電容。由于采用高頻功率變換，使電源裝置顯著減小了體積和重量，而有可能和設(shè)備的主機(jī)體積相協(xié)調(diào)，并且使電性能得到進(jìn)一步提高。
開關(guān)電源的使用為國家節(jié)省了大量銅材、鋼材和占地面積。由于變換效率提高，能耗減少，降低了電源周圍環(huán)境的室溫，改善了工作人員的環(huán)境。我國郵電通信部門廣泛采用開關(guān)電源極大地推動了它在其它領(lǐng)域的廣泛應(yīng)用。值得指出的是，近兩年來出現(xiàn)的電力系統(tǒng)直流操作電源，是針對國家投資4000億元用于城網(wǎng)、農(nóng)網(wǎng)的供電工程改造、提高輸配電供電質(zhì)量而推出的，它已開始采用開關(guān)電源以取代傳統(tǒng)的相控電源。國內(nèi)一些通信公司均已相繼推出系列產(chǎn)品。
目前，國內(nèi)開關(guān)電源自主研發(fā)及生產(chǎn)廠家有300多家，形成規(guī)模的有十多家。國產(chǎn)開關(guān)電源已占據(jù)了相當(dāng)市場，一些大公司自主開發(fā)的電源系列產(chǎn)品已獲得廣泛認(rèn)同，在電源市場競爭中頗具優(yōu)勢，并有少量開始出口。
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.