移動通信開關(guān)電源的新技術(shù)及其應(yīng)用電氣工程及其自動化畢業(yè)論文中英文翻譯-wenkub
2022-11-28 10:06:28 本頁面
【正文】 d effect tube turnon frequency to be possible to achieve 450 MHz, already widely to frequency higher switching power supply,but ordinary VMOS tube when high voltage big electric current work leads passes the resistance to be very big, the ponent gives off heat, the output efficiency drops. Recent years developed the IGBT insulation grid double pole transistornot only had the MOSryT voltage drive and so on all merits, meanwhile had the doublepole big power tube to saturated to lead passes the pressure drop low characteristic, mainly used in the hectowatt levelto the kilowatt level capacity frequency is about in the 2kkkHz switching power supply. According to the daily maintenance and the maintenance work statistics, in several kind of factories switching power supply modules which Jiangsu Province used uses the IGBT insulation grid double pole transistor to take the power switch ponent. Uses the power factor pensation electric circuit. The power factor in the electrical power system is a count for muchtarget, the power group number (Pf) the definition changes suddenly the active power for the electrical work in and the load ratio of apparent power which or the pulsating current produces, in the ideal situation the power factor is 1. Creates the power factor small main reason is the alternating voltage and the electric current work(flows voltage and electric current in the different phase has phaseshift) or the alternating voltage and the electric current profile has the distortion. In the high frequency switching power supply mainly is because the power source input end rectification filter circuit is the acmodating load, causes the alternating voltage and the electric current has the phase deviation to cause thepower factor reduction. Moreover, because in electric circuit otherfactors influences, also can cause the alternating current which the switching power supply inputs to have some distortions. Below thepower factor young fellow produces to the electrical power systemaffects: (1) causes the electrical work input alternating current toincrease. With I expression input current, i expression wattfulcurrent, obtains through the putation: When Pf=,I=。new technology。 application. Foreword 20 kHz switching power supply in overseas starts from the 7039。Pf=,I=。 When K1, the K2 closure, K3, K4 lead passes, the L beginnings andends voltage is VL. Automatically uses the output current to flow the technology Because the munications system cannot interrupted move theparticularity, requests the power equip
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