DEVICE FOR AUTOMATIC CONTROL OVER BRIDGE THYRISTOR RECTIFIER

摘要

FIELD: measurement equipment. ^ SUBSTANCE: invention relates to electrical measurement equipment and may be used for contactless automated control of the value of half-period average voltage of a bridge thyristor rectifier when situations occur in the rectification circuit that are connected with thyristor rupture or disruption. the device contains a mictoinductive solenoid-concentrate represented by several coils of the thyristor rectifier feed wireway. Inside the solenoid a sensor is placed whose output is connected to the signal amplifier. The amplifier output is connected to the input of a band filter set to frequency 2ë where ë is frequency of the voltage feeding the bridge thyristror rectifier. The band filter output is connected to the inputs of the logical unit comparators having different response levels. To the lower response level comparator output inputs of logical circuits 2AND-NO and 2AND of the logical unit. Connected to the second input of logical circuit 2AND-NO are the higher response level comparator output and the second input of the thyristor rectifier control system. Output of logical circuit 2AND-NO is connected to the second input of logical circuit 2AND to the output whereof the first input of the thyristor rectifier control system is connected. ^ EFFECT: improved reliability of operation. ^ 3 dwg