公开(公告)号：US4259581A

公开(公告)日：1981-03-31

申请号：US26885

申请日：1979-04-04

Applicant: Peter Csontos ,  Laszlo Henter ,  Laszlo Kalman ,  Tibor Kondor ,  Istvan Wein

Inventor： Peter Csontos ,  Laszlo Henter ,  Laszlo Kalman ,  Tibor Kondor ,  Istvan Wein

IPC: H03K3/53 ,  H02M7/515 ,  H05G1/20 ,  H05G1/22 ,  H05G1/00

CPC classification number: H05G1/20 ,  H02M7/5152 ,  H05G1/22

Abstract: An inverter for diagnostic X-ray equipment, comprising a thyristor bridge with an input diagonal connected in series with two commutating inductances across a DC power supply, is provided with a start-stop circuit which includes an ancillary thyristor connected in series with a diode and a current-limiting impedance across one of the bridge arms. On start-up, the ancillary thyristor is triggered simultaneously with the diagonally opposite bridge thyristor in order to connect the current-limiting impedance in series with the AC output diagonal of the bridge during the first half-period; for a quick cutoff, the ancillary thyristor and the associated bridge thyristor are turned on together whereby two previously charged quenching capacitors, one of them included in the start-stop circuit, are discharged through the commutating inductance in series with the associated bridge arm to terminate conduction in another bridge arm fed through the same commutating inductance. A protective unit connected across the input diagonal of the bridge includes a further capacitor, charged from an auxiliary voltage source, which reverse-biases the bridge thyristors by way of another thyristor fired upon detection of a short circuit or overload.

Abstract translation: 一种用于诊断X射线设备的逆变器，包括具有与跨越直流电源的两个换向电感器串联的输入对角的晶闸管桥，具有启动 - 停止电路，其包括与二极管串联连接的辅助晶闸管， 横跨桥臂之一的限流阻抗。 在启动时，辅助晶闸管与斜对置桥式晶闸管同时触发，以便在上半年期间将限流阻抗与桥梁的交流输出对角线串联连接; 为了快速切断，辅助晶闸管和相关联的桥式晶闸管导通在一起，其中包括在启动 - 停止电路中的一个预先充电的淬火电容器通过与相关联的桥臂串联的换向电感放电，以终止 通过相同的换向电感馈送的另一桥臂中的导通。 连接在桥的输入对角线上的保护单元包括从辅助电压源充电的另外的电容器，其在检测到短路或过载时通过另一晶闸管反向偏置桥接晶闸管。