Bistable state permanent magnetism alternating current contactor with rapid charging and discharging control characteristics

Abstract

The invention relates to a double steady state permanent magnetic AC contactor provided with quickly charging and discharging control characteristics, mainly comprising a contact universal driving shaft, a vertical universal driving shaft, an overtravel spring, a moving contact, a fixed contact, a current-conducting plate, a wiring contact terminal, an upper support, a base, an upper magnetic yoke armature, a permanent magnet, a lower magnetic yoke armature and a coil. A topological circuit comprises a low pass filter circuit, a power supply overvoltage protection, a rectification circuit, an energy storing voltage monitoring circuit, an under-voltage judgment circuit, an on signal generation circuit, an on coil overvoltage protection, a negative feedback element, a switch-on execution mechanism, an energy storing capacitance, an energy storing capacitance overvoltage protection, an off signal generation circuit, an off coil overvoltage protection and a switch-off execution mechanism. The double steady state permanent magnetic AC contactor introduces the negative feedback element and uses the means of separating an off coil and an on coil to realize quick charging and discharging process and improves the on / off electric speed and the stability of a control unit; simultaneously, the moving contact is separated from an operating mechanism, thereby the double steady state permanent magnetic AC contactor is convenient in test and detection and has strong practical value.

Description

technical field [0001] The invention is a bistable permanent magnet AC contactor with fast charging and discharging control characteristics, relates to the design of a permanent magnet AC contactor and a control circuit thereof, and belongs to the technical field of switch control devices. Background technique [0002] The permanent magnet AC contactor has low noise, is less affected by the grid voltage fluctuation, and has a remarkable energy-saving effect. Therefore, the research and use of the permanent magnet AC contactor has attracted widespread attention. [0003] The typical structure of the existing permanent magnet AC contactor is: permanent magnet, moving iron core, yoke, coil and topological circuit that provides pulse current for the coil, wherein the moving iron core, yoke and permanent magnet are the main parts of the magnetic circuit, and the permanent The magnet is placed on the moving iron core or the yoke, and the pulse current is passed through the coil to...

AI Technical Summary

Problems solved by technology

[0005] Although the permanent magnet AC contactor has many advantages, according to the market survey of the applicant, the existing permanent magnet AC contactor has not been widely promoted. After research and analysis, it is found that the original electromagnetic AC contactor has a simple structure. Short closing and opening process, stable performance

The problem existing in the prior art is: since the closing and opening of the permanent magnet AC contactor operating mechanism is realized by the charging pulse current and discharging pulse current provided by the topology circuit, compared with the mechanical closing and opening time, The electrical opening and closing time formed by the charging pulse current flow time and the discharge pulse current flow time is long, which affects the stability of the permanent magnet AC contactor control unit

Images