A short-circuit protection device for a solid-state switch

Abstract

The invention belongs to the technical field of power electronics, and particularly relates to a short-circuit protection device of a solid-state switch. The short-circuit protection device of the solid-state switch comprises a power device switch unit, an intelligent detection and protection unit and a buffer circuit unit, wherein the power device switch unit is connected to a main circuit system and is used for achieving on / off function of a main circuit; the intelligent detection and protection unit comprises a near-end short-circuit protection module and a remote-end short-circuit protection module and is used for sending out a shut-off signal to the power device switch unit when in a near-end short-circuit or a remote-end short-circuit; and the buffer circuit unit is connected to two ends of the power device switch unit and is used for absorbing over-voltages generated at two ends when the short-circuit is shut off and the power device switch unit is turned off. A corresponding solving method is provided from three aspects of near-end short-circuit protection, remote-end short-circuit protection, over-voltage protection and the like; the condition that the solid-state switch can be safely and reliably turned off under different short-circuit conditions is ensured; meanwhile, no maloperation of the solid-state switch in an intense electromagnetic interference environment is ensured; the short-circuit protection device of the solid-state switch has good reliability; and the short-circuit protection of the solid-state switch can be effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a short circuit protection device. Background technique [0002] With the rapid development of the power system, the modern power system is facing a series of new contradictions and problems. A large number of distributed energy sources and the emergence of a large number of micro-grids have put forward higher and higher requirements for the switching speed. The traditional mechanical switch is slow in action and difficult to extinguish the arc. It is becoming more and more difficult to adapt to the occasions that require high switching speed, such as ultra-fast load switches, current-limiting circuit breakers, and seamless transfer switches. The solid-state switch replaces the traditional mechanical switch with power electronic devices. It is a non-contact switch device that uses power electronic devices as switch components. It has the advantages of fast ...

AI Technical Summary

Problems solved by technology

[0003] In view of the above technical problems, the present invention provides a short-circuit protection device for a solid-state switch to solve the defect that the solid-state switch in the prior art cannot be effectively protected when a short circuit occurs;

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