【正文】 high power density, a small amount of light。s energy crisis, caused people to a wide range of customs. Linear power supply works in the frequency, the frequency used for the 20 kHZ the PWM switching power supply alternatives, could significantly conserve energy and power technology in the history of the development called 20 kHZ revolution. With ULSI chip size decreases, the size and power is much greater than the microprocessor。s munications (such as the switchNote) in the ACDC power supply and DCDC switching power supply in the area of application is still relatively low proportion of six. The end of the 1980s largescale upgrading of China39。 web server (Server) The switching power supply to be a portable electronic equipment such as the highfrequency switching power supply. More than a brief review of the process of switching power supply development and the performance. I believe the 21st century, the power switch theory and technology development will have a more brilliant achievements , I hope this message of the crosscentury youth power experts. 開關(guān)電源發(fā)展軌跡 開關(guān)電源發(fā)展軌跡（察宣蘭） 開關(guān)穩(wěn)壓電源（以下簡稱開關(guān)電源）取代晶體管線性穩(wěn)壓電源（以下簡稱線性電源）已有 30 多年歷史，最早出現(xiàn)的是串聯(lián)型開關(guān)電源，其主電路拓撲與線性電源相仿，但功率晶體管了作于開關(guān)狀態(tài)后來脈寬調(diào)制（ PWM）控制技術(shù)有了發(fā)展，用以控制開關(guān)變換器，得到 PWM 開關(guān)電源，它的特點是用20kHz 脈沖頻率或脈沖寬度調(diào)制一 PWM 開關(guān)電源效率可達 65～ 70％，而線性電源的效率只有 30 一 40％。 80 年代進入大規(guī)模生產(chǎn)和廣泛應用階段，并開發(fā)研究 ～ 5MHz準諧振型軟開關(guān)電源。 3 1000kW牽引變流器 4500V／ 1200A GTO 門控250W開關(guān)電源。供繼電保護和自動裝置及蓄電池充電用。 主要技術(shù)標志 從技術(shù)上看，幾十年來推動開關(guān)電源性能和技術(shù)水平不斷提高的本要標志是： 。 70 年代諧報開關(guān)電源奠定了軟開關(guān)技術(shù)的基礎(chǔ)。 。 。 EMI 濾波器技術(shù)的進步，使開關(guān)電源小型化并提高了 EMC 性能。我國已將最新軟開關(guān)技術(shù)應用于 6Kw 通信電源中，效率達 93%。超快恢復功率二極管， MOSF ET 問步整流技術(shù)的開發(fā)也為高效低電壓輸出（例如 3V）開關(guān)電源的研制有了可能。主開關(guān)管用 IGBT 或功率 MOSFET。用 4 臺 10kw 全橋多諧振 ZVS 變換器并聯(lián)。 80 年代末我國通信電 源大規(guī)模更新?lián)Q代，傳統(tǒng)的鐵磁穩(wěn)壓 整流電源和晶閘管（ Thyristor，原稱可控硅元件）相控穩(wěn)壓電源為大功率（ 48V， 6kw） AC－ DC開關(guān)電源（通信系統(tǒng)中常稱為開關(guān)型整流器 SMR）所持代；并開始在辦公室自動化設備中得到應用。線性電源工作于工頻，因此用工作頻率為 20kHZ 的 PWM開關(guān)電源替代，可大幅度節(jié)約能源，在電源技術(shù)發(fā)展史上譽為 20kHZ革命。s also developed a number of new nonclearance for power, the typical examples are as follows: 1. Satellite switching power supply. The East is Red on the 3rd munication satellite, Fengyun 1, 2 meteorological satellite applications are the switching power supply. Features: Multioutput, nonmaintenance, longterm requirements do not change the performance, set up redundant modules, high reliability, EMC meet the space environment conditions, high efficiency, small light. 2 longrange rocket control system for DCDC switching power supply to launch the process of highly reliable. 3 1000kW traction converter 4500 V/1200A GTO gated 250 W switching power supply. 4 40kW soli