Adjustable current-limiting protection circuit on direct current loop

Abstract

The invention provides an adjustable current-limiting protection circuit on a direct current loop. The current-limiting protection circuit comprises a signal processing circuit and a comparison control circuit which are connected with a driving switch circuit; circuit signals are collected at the inlet and outlet of the driving switch circuit, processed by the signal processing circuit and then output to the comparison control circuit; and after comparing a standard signal, the comparison control circuit outputs a control signal to the driving switch circuit so as to control the turned-off of the driving switch circuit. According to the invention, current flowing over a main circuit is indirectly monitored through the real-time sampling of the conduction voltage drops of the two ends of IGBT (insulated gate bipolar transistor); with IGBT as core, real-time comparison is carried out through directly detecting overcurrent in the circuit so that a breaking circuit is protected, breaking action is rapid without contact electric arc; the adjustable current-limiting protection circuit of the invention has the advantages of automatic restoration, automatic control and high working efficiency, can adjust a circuit amplification coefficient so as to continuously achieve the adjustment of a current-limiting value.

Description

technical field [0001] The invention relates to a current limiting protection circuit, in particular to an adjustable current limiting protection circuit on a direct current loop. Background technique [0002] There are many forms of overcurrent protection methods for general high-power DC power supply circuits: such as the implementation of explosive breaking devices and fast fuses; there are also surge current protections that are sensitive to current rise on circuit breakers (air breakers) that use the thermal effect of current. There are also power electronic insurance devices that monitor the current in the current through a series sampling resistor in the circuit, and so on. These structural forms have limited protection capabilities and relatively backward control means, which limit the scope of use. [0003] The application of IGBT in the high-power DC power supply circuit has been quite extensive, the control power is high, and the control method is convenient. How...

AI Technical Summary

Problems solved by technology

These structural forms have limited protection capabilities and relatively backward control methods, which limit the scope of use.

[0003] The application of IGBT in the high-power DC power supply circuit has been quite extensive, the control power is high, and the control method is convenient, but the unique transmission characteristics of the IGBT itself need to be developed in the field of current limiting protection.

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