三相交流模塊在500A調壓式恒流源中的應用

摘要：　　研制的大功率大電流恒流源，其負載0.05～0.1Ω為感性或電阻性，電流200～500A，連續可調，三相交流供電在±10%內變化。對穩定度、準確度、重復性、紋波等技術指標有較高要求，本方案采用線性串聯調整式技術途徑，負載、電流、電網大范圍變化均由調整管調節，采用三相交流模塊，通過改變晶閘管的導通角，調節三相交流變壓器的輸入電壓，從而控制恒流源的直流供電電壓，使調整管的管壓降在5～10V范圍內，成倍減少調整管數量，簡化散熱措施，優化結構布局。提高技術指標性能，增加可靠性。 敘詞：交流模塊、恒流源、串聯調壓式 Abstract：The application of three phase AC module in 500A voltage-adjusting constant current ource is introduced in this paper.With such scheme,the DC output voltage of constant current source,the conduction angle of thyristor and the input voltage of three phase AC trans-former could be controlled effectively.finally,the performance and reliability improvement of high power high current contant current source should be attributed to the remarkable reduction of adjuting thyristor,the simplification of heat radiation measure and the optimization of layout Keyword：AC module constant current source series voltage-adjusting type