【正文】 oltages, it can greatly reduce the loss, convenient maintenance, and installation, increase is very convenient. Generally can be directly mounted in the standard control panel, the secondary power supply requirements is high power density. Because of munication increasing, the capacity of munication power supply capacity will also continue to increase. 直流直流(DC/DC)變換器 DC DC converter (DC/DC)DC/DC變換器將一個固定的直流電壓變換為可變的直流電壓,這種技術被廣泛應用于無軌電車、地鐵列車、電動車的無級變速和控制,同時使上述控制獲得加速平穩(wěn)、快速響應的性能,并同時收到節(jié)約電能的效果。用直流斬波器代替變阻器可節(jié)約電能(20~30)%。直流斬波器不僅能起調壓的作用(開關電源), 同時還能起到有效地抑制電網側諧波電流噪聲的作用。DC/DC converter to a fixed DC voltage transformation as a variable DC voltage, this technology has been widely applied in the trolley buses, subways, trains, stepless variable speed and control of electric vehicle, and to make the control to obtain smooth acceleration and fast response performance, and at the same time receive electrical energy saving effect. Use the dc chopper instead rheostat can save electric energy (20 ~ 30) %. Dc chopper can not only ACTS as voltage regulation (switching power supply), but also can effectively inhibit the action of the grid side harmonic current noise.通信電源的二次電源DC/DC變換器已商品化,模塊采用高頻PWM技術,開關頻率在500kHz左右,功率密度為5W~20W/in3。隨著大規(guī)模集成電路的發(fā)展,要求電源模塊實現(xiàn)小型化,因此就要不斷提高開關頻率和采用新的電路拓撲結構,目前已有一些公司研制生產了采用零電流開關和零電壓開關技術的二次電源模塊,功率密度有較大幅度的提高。Communication power supply in the secondary power supply DC/DC converter has been mercialized, modules using high frequency PWM technology, switching frequency about 500 KHZ, the power density of 5 w to 20 w/in3. With the development of large scale integrated circuit, power supply module to realize miniaturization, thus will improve the switch frequency and using the new circuit topology, there are some of the pany development and production with zero current switch and zero voltage switching technology of secondary power supply module, power density is greatly improved. 不間斷電源(UPS) uninterruptible power supply (UPS)不間斷電源(UPS)是計算機、通信系統(tǒng)以及要求提供不能中斷場合所必須的一種高可靠、高性能的電源。交流市電輸入經整流器變成直流,一部分能量給蓄電池組充電,另一部分能量經逆變器變成交流,經轉換開關送到負載。為了在逆變器故障時仍能向負載提供能量,另一路備用電源通過電源轉換開關來實現(xiàn)。Uninterruptible power supply (UPS) is a puter and munications systems and required to provide necessary occasions could not interrupt a high reliable, high performance power supply. Ac mains input into dc rectifier, part of the energy to the battery charging, the another part of the energy to ac inverter, the switch to the load. For the inverter failure can still provide the energy to the load, the other standby power by the power switch on the way.現(xiàn)代UPS普遍了采用脈寬調制技術和功率M0SFET、IGBT等現(xiàn)代電力電子器件,電源的噪聲得以降低,而效率和可靠性得以提高。微處理器軟硬件技術的引入,可以實現(xiàn)對UPS的智能化管理,進行遠程維護和遠程診斷。Modern UPS M0SFET generally adopts the pulse width modulation technology and power, modern power electronic devices such as IGBT, power supply noise is reduced, and the efficiency and reliability. The introduction of microprocessor hardware and software technology, can realize the UPS intelligent management, remote maintenance and remote diagnosis.目前在線式UPS的最大容量已可作到600kVA。超小型UPS發(fā)展也很迅速,、lkVA、2kVA、3kVA等多種規(guī)格的產品。The current maximum capacity has online UPS can do 600 kva. Subminiature UPS is also very rapid development, already has kVA, lkVA, 2 kVA, 3 kVA and various specifications of the products. 變頻器電源 inverter power supply變頻器電源主要用于交流電機的變頻調速,其在電氣傳動系統(tǒng)中占據的地位日趨重要,已獲得巨大的節(jié)能效果。變頻器電源主電路均采用交流直流交流方案。工頻電源通過整流器變成固定的直流電壓,然后由大功率晶體管或IGBT組成的PWM高頻變換器, 將直流電壓逆變成電壓、頻率可變的交流輸出,電源輸出波形近似于正弦波,用于驅動交流異步電動機實現(xiàn)無級調速。Inverter power supply is mainly used in ac motor frequency control of motor speed, which occupy a position has bee increasingly important in electric drive system, has obtained huge energy saving effect. Inverter main circuit power supply adopt ac dc ac solution. Variable frequency power supply through the rectifier into a fixed dc voltage, and then made up of highpower IGBT transistor or PWM high frequency converter, inverter dc voltage into variable ac output voltage, frequency, power supply output waveform similar to sine wave, used to drive ac asynchronous motor to realize stepless speed regulation.國際上400kVA以下的變頻器電源系列產品已經問世。八十年代初期,日本東芝公司最先將交流變頻調速技術應用于空調器中。至1997年,其占有率已達到日本家用空調的70%以上。變頻空調具有舒適、節(jié)能等優(yōu)點。國內于90年代初期開始研究變頻空調,96年引進生產線生產變頻空調器,逐漸形成變頻空調開發(fā)生產熱點。預計到2000年左右將形成高潮。變頻空調除了變頻電源外,還要求有適合于變頻調速的壓縮機電機。優(yōu)化控制策略,精選功能組件,是空調變頻電源研制的進一步發(fā)展方向。Under international 400 kva inverter power supply series of products has been available. In the early eighty s, Japan39。s Toshiba first ac variable frequency speed regulation technology was applied to the air conditioner. Japan to 1997, its share has reached more than 70% of household air conditioning. Frequency conversion air conditioning has the advantages of fortable, energysaving. Beginning in the early 90 s research frequency conversion air conditioning, frequency conversion air conditioner, introduced in 96 production line production gradually formed frequency conversion air conditioning development and production of hot spots. By 2000 or so would be a climax. In addition to variable frequency power supply, frequency conversion air conditioning also requires suitable for frequency control of motor speed of pressor motor. Optimization control strategy, the selection of functional ponents, air conditioning variable frequency power supply is developed by further development direction. 高頻逆變式整流焊機電源 high frequency inverter rectifier welding machine power supply高頻逆變式整流焊機電源是一種高性能、高效、省材的新型焊機電源,代表了當今焊機電源的發(fā)展方向。由于IGBT大容量模塊的商用化,這種電源更有著廣闊的應用前景。Highfrequency rectifier inverter welding power source is a kind of new type welding machine power supply of high performance, high efficiency, save material, represents the development direction of welding power source. Because of the large capacity IGBT module, the power supply has a broad application prospect.逆變焊機電源大都采用交流直流交流直流(ACDCACDC)變換的方法。50Hz交流電經全橋整流變成直流,IGBT組成的PWM高頻變換部分將直流電逆變成20kHz的高頻矩形波,經高頻變壓器耦合, 整流濾波后成為穩(wěn)定的直流,供電弧使用。Most of the welding inverter power supply adopt AC DC AC DC AC DC A