DEVICE FOR CONTROL OF THREE-PHASE BRIDGE RECTIFIER THYRISTORS Russian patent published in 2020 - IPC H02M7/162 

FIELD: electrical equipment.

SUBSTANCE: invention is related to electric engineering and is intended for control of power thyristors of converters, and in particular three-phase controlled bridge rectifiers used for control of rectified voltage in transport equipment. At that, voltage of three-phase alternating current source is supplied to input of thyristor control device through three-phase transformer, primary and secondary windings of which are connected as per "triangle" scheme. Voltage of the secondary windings of the three-phase transformer supplied to the thyristor control device simultaneously is not only synchronizing, but also control. Technical result is achieved by the fact that the three-phase bridge rectifier thyristors control device contains control channels, each of which consists of two main transistors connected by bases through resistors and collectors through load elements to one (for example, positive) terminal, and emitters - to other (for example, negative) output of DC power supply, wherein their base-emitter junctions are shunted by capacitors and chains of two series-connected diodes, to connection points of which to each other are connected outputs of secondary winding of one of phases of three-phase voltage transformer, which is both a source of both synchronizing and control voltage, connected by its primary windings to a three-phase alternating current source, each control channel additionally includes two pulse transformers, primary winding of each of which is connected between the collector and positive terminal of DC power supply source, and secondary is intended for connection to control circuit of corresponding three-phase rectifier thyristor, two additional transistors, each of which by its collector-emitter junction shunts resistor in main transistor base circuit, and between its base and positive terminal of DC power supply a resistor is connected, besides, primary winding of each pulse transformer is shunted by diode, cathode of which is connected to positive terminal of DC power supply source.

EFFECT: technical result of disclosed invention is expansion of functional capabilities of device for controlling thyristors of three-phase bridge rectifier by constructing three control channels by number of phases A, B, C, in each of which there performed is synchronization, control and regulation of phase of output rectangular control pulses, their formation and amplification providing stabilization of output voltage of three-phase bridge rectifier with change of amplitude value and its input three-phase alternating voltage frequency supplied from three-phase alternating current source (for example, three-phase synchronous generator).

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