Self-energy-taking thyristor valve

Abstract

The present invention provides a self-energy-taking thyristor valve. The self-energy-taking thyristor valve comprises at least one basic unit, each basic unit comprises a trigger plate, an alternating-current voltage-sharing circuit, a direct-current voltage-sharing circuit and a thyristor set, the two ends of the alternating-current voltage-sharing circuit and the two ends of the direct-current voltage-sharing circuit are each connected with one trigger plate, and the trigger plates are connected with thyristors in the thyristor set. The self-energy-taking thyristor valve has the advantages that: the basic units are connected in series through the thyristor set, so that the basic units are convenient to increase and decrease, and different voltage class requirements are met; an energy taking circuit is arranged, the trigger plate does not need external power supply, only the optical fiber needs to be connected between the trigger plate and the upper computer, electromagnetic isolationis achieved, and the insulation requirement and the anti-interference requirement of a high-voltage system are met; a positive voltage monitoring circuit is arranged to monitor the voltage of the trigger plate on line; and an overvoltage protection circuit is arranged, so that the thyristor can be protected.

Description

technical field [0001] The invention relates to the field of thyristor valves, in particular to a self-energy-capturing thyristor valve. Background technique [0002] The high-voltage soft starter is a motor control device that integrates motor soft start, soft stop, light load energy saving and various protection functions. Its main composition is a three-phase parallel thyristor valve and its electronic control circuit connected in series between the power supply and the controlled motor. Different functions can be realized by using different control methods to control the conduction angle of the three-phase parallel thyristor, so that the input voltage of the controlled motor can be changed according to different requirements. [0003] The thyristor valve is the core component of the high-voltage soft starter. The trigger board of the traditional thyristor valve is powered by the controller. At the same time, in order to realize the electromagnetic isolation between the ...

AI Technical Summary

Problems solved by technology

[0003] The thyristor valve is the core component of the high-voltage soft starter. The trigger board of the traditional thyristor valve is powered by the controller. At the same time, in order to realize the electromagnetic isolation between the controller and the trigger board, an additional pulse transformer is required, which increases the production cost of the thyristor valve.

In addition, these pulse transformers cannot achieve electromagnetic isolation in a true sense. After the pulse transformer is damaged, it is very easy to cause a large accident due to the strong current in the primary circuit being connected to the secondary control circuit.

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