铁道通信信号实习报告.doc

铁道通信信号实习报告.doc小功率晶闸管整流电路设计
摘要
随着电力电子器件的发展,电力电子技术在电气传动技术的舞台上也慢慢发展起来,现代的电力电子技术无论是在改造传统工业还是在高新技术产业都至关重要,本设计主要是利用电力电子技术,通过三相全控整流电路,将交流电能通过整流电路转换成直流电能,大多数整流电路主要由变压器、整流主电路、和滤波器等组成。设计中应准确计算相应元器件的参数,使其输出的直流电能满足所用负载的额定工作条件,并且通过实际设计以及计算过程,了解这门技术的重要性,并提高自身知识水平。
关键词:整流电动机全控桥式三相
目录
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使输出电流连续的临界电感量··············
限制输出电流脉动的电感量···············
电动机电感量LD和变压器漏电感量········
实际串入电抗器电感量··········
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附:设计原理图
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方案一:三相半波相控整流电路
优点:三相整流电路中,三相半波相控整流电路突出的优点是电路简单,用的晶闸管少,触发器也少,对需要220V 电压的用电设备直接用380V电网供电,而不需要另设整流变压器。
缺点:要求晶闸管耐压高,整流输出电压脉动大,需要平波电抗器容量大,电源变压器二次电流中有直流分量,增加了发热和损耗。因零线流过负载电流,在零线截面小时压降大,往往需要从变压器单独敷设零线。
方案二:三相桥式全控整流电路
优点:在输出整流电压相同时,电源相电压可较零式整流电路小一半,因此显著减轻了变压器和晶闸管的耐压要求。变压器二次绕组电流中没有直流分量。输出整流电压脉动小,所以平波电抗器容量