Excitation constant-current device for TFW brushless generator

Abstract

The invention relates to an excitation constant-current device for a TFW brushless generator. According to the excitation constant-current device, an input sampling voltage filtering amplifying circuit connected with a three-phase winding of the generator sequentially passes through a comparison amplifying circuit, a phase-shift trigger circuit and an excitation and rectification output circuit to be excited and output, a silicon controlled rectifying circuit and an overcurrent setting circuit of the excitation and rectification output circuit are connected with a differential amplifier and a first delay integral circuit, the overcurrent setting circuit is connected with the comparison amplifying circuit, the differential amplifier is connected with a generator excitation winding through an overcurrent output comparator, and the first delay integral circuit is respectively connected with the overcurrent output comparator and a second delay integral circuit. The additionally-arranged overcurrent setting circuit can monitor changes of the load current of the generator to adjust the intensity of the excitation current in real time so that output voltage of the generator can keep unchanged. The excitation constant-current device has the advantages of being stable in work and high in reliability and protecting the current in a constant-current mode.

Description

technical field [0001] The invention relates to a generator, specifically a TFW brushless generator excitation constant current device, which is suitable for the AC brushless generator excitation system below 1000KW. Background technique [0002] The traditional generator automatic voltage regulator (AVR) is a kind of automatic adjustment of the excitation current according to the output voltage of the generator to maintain the output voltage of the generator at a stable level. Its overcurrent protection is generally protected by cutting off the output switch or turning off the excitation circuit. If the output is not cut off, the current of the field winding of the generator will be too large and overheated and burnt. [0003] The disadvantage of the traditional generator automatic voltage regulator is: once the generator has an overcurrent fault, due to the non-buffering process, it will immediately [0004] power failure. In some specific places, such as hospital o...

AI Technical Summary

Problems solved by technology

If the output is not cut off, the current of the field winding of the generator will be too large and overheated and burnt

[0003] The disadvantage of the traditional generator automatic voltage regulator is: once the generator has an overcurrent fault, due to the non-buffering process, it will immediately

In some specific places, such as hospital operations in progress, elevators in high-rise buildings, etc., sudden power failure will cause serious adverse consequences

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