发明名称 Overvoltage protection circuit for thyristors in frequency converter - has dual-primary transformer to reduce restrictions on thyristor turn-off volts
摘要 <p>The protection circuit has a transformer (10) with two separate identical primary windings (W1,W2) each in series with one of two thyristors (21,22) and an oppositely-poled diode (11,12) in a return supply path (Z1,Z2). The secondary winding (W3) of the transformer is connected to a full wave bridge rectifier (13). The dc output of the bridge is connected to the ends of the primary windings. The turns ratio of the windings (W1,W2,W3) is 1:1:2. The windings are tightly coupled. The advantage lies in not having to choose the turn-off voltages of the thyristors and diodes specially -- i.e. sufficient protection is provided without taking this measure.</p>
申请公布号 DE2933577(A1) 申请公布日期 1981.03.26
申请号 DE19792933577 申请日期 1979.08.18
申请人 LICENTIA PATENT-VERWALTUNGS-GMBH 发明人 WATERMANN,GREGOR
分类号 H02H7/12;(IPC1-7):02H7/127 主分类号 H02H7/12
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