Digital whole process dynamic control intelligent AC contactor

Abstract

The invention relates to the field of intelligent control over equipment, in particular to an intelligent alternating current contactor capable of being controlled digitally and dynamically in the whole process. A digital chip is used for realizing closed-loop control over the speed in an attraction process of the alternating current contactor (based on coil current falling edge slope), impact energy of a movable / static iron core and a movable / static contact is controlled directly, and bouncing of the iron core and the contact in the attraction process can be reduced substantially; the attraction and supporting process works in a current closed loop chopping mode, chopping frequency is adjusted automatically, and voice frequency noise is prevented from occurring; meanwhile, attraction and supporting currents can be kept stable in a wide input voltage range, and therefore energy-saving silent closed loop operation can be realized; a disjunction process applies direct current negative voltages to the two ends of a coil after rectification and filtration, so that the coil current is made to descend quickly, an electromagnetic system is demagnetized quickly, and the contact is disjunctive quickly at a moment before zero; the intelligent alternating current contactor also has a self correction function of zero-current disjunction, and therefore the problem that control over zero-current disjunction fails due to disperse movement of the contactor, abrasion of the contact and other factors can be solved.

Description

technical field [0001] The invention relates to the field of intelligent control of equipment, in particular to an intelligent AC contactor for dynamic control of the whole digital process. Background technique [0002] In recent years, the intelligent control of AC contactors has developed rapidly, and various control schemes have emerged. In the early days, most of the open-loop control schemes of high-voltage DC starting and low-voltage DC holding of AC contactors were adopted. The control module with the single-chip microcomputer as the core was combined with the modified AC contactor body to realize selective segmental control and suction during the starting process. Energy-saving and silent operation in the sustaining stage. However, due to the structure of the main body of the AC contactor, the actions of the iron core and the coil are highly dispersed during the working process. Even if the number of times the same contactor works increases, the action value will ch...

AI Technical Summary

Problems solved by technology

In the above control schemes, the single-chip microcomputer is used as the core control device to control the entire operation process of the contactor, and cooperate with the external analog power supply control chip or switch circuit to indirectly realize the closed-loop or open-loop control of the excitation state of the contactor, so that the contactor The performance of the contactor has been improved to a certain extent, but there are many components required, and the direct control of the excitation state of the contactor cannot be realized through a single control chip. It is difficult to efficiently integrate complex control strategies in the control process, which restricts the effective control of the contactor.

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