Intelligent protection circuit applicable to high-voltage and high-power electric rudder system

Abstract

The invention relates to an intelligent protection circuit applicable to a high-voltage and high-power electric rudder system. The intelligent protection circuit includes an SVPWM multi-channel processing module, a fast comparison isolation module and an intelligent protection integrated logic module. By adopting a multi-channel integrated level conversion circuit, a buffer circuit with strong driving ability and a micro high-speed photoelectric isolation circuit, the dynamic response speed and anti-jamming capability of the rudder system are enhanced, and the problem that a single protection mode has logic defects and insufficient dynamic response to system control is solved. The SVPWM output mode is controlled after a two-phase current fast comparison current limiting output signal and a software current limiting control signal are integrated logically and maintained by a trigger, which can avoid system protection malfunction. The circuit is highly integrated and intelligent, easy to implement, low in cost and highly adaptable.

Description

technical field [0001] The invention relates to an intelligent protection circuit adapted to a high-voltage and high-power electric rudder system. Background technique [0002] The performance and reliability of the high-power electric steering system are closely related to the signal processing and isolation of the system, the driving and protection strategies of the power switching devices. The switching frequency of high-voltage and high-power IGBT or IPM is generally more than ten kHz or even higher. Due to the stray inductance of different sizes in the circuit design, at high frequencies, it will have a great impact on the stable operation of the entire circuit. A large surge voltage is generated, and a recovery surge voltage is generated. The existence of turn-off surge voltage and recovery surge voltage will affect the normal operation of IGBT or IPM, such as increased switching loss, high operating temperature, and even damage; at the same time, the high current out...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an intelligent protection circuit adapted to the high-voltage and high-power electric rudder system, which solves the logic defect of the existing technical solution due to system interference or the deficiency of a single measure, and can meet the high dynamics of the system at the same time. Responsive performance needs

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