Contactor power saver detecting circuit

Abstract

The invention discloses a contactor power saver detecting circuit. On the basis of the existing contactor power saver circuit composed of a rectifier bridge and a main power circuit, a rectifier circuit, a sampling circuit and a threshold comparison circuit are additionally provided. The threshold comparison circuit is internally provided with a reference 1 and a reference 2. When the peak voltageof an output signal of the sampling circuit is greater than the reference 1, the main power circuit is controlled to work, and a contactor is closed; when the peak voltage of the output signal of thesampling circuit is less than the reference 2, the main power control circuit is switched off, and the contactor is released; it is required that the peak voltage of the output signal of the samplingcircuit when input voltage is AC is equal to the peak voltage of the output signal of the sampling circuit when the input voltage is DC, so that a voltage point that triggers action of the contact isenabled to be the same. Therefore, the object that attracting and releasing voltage points of the wide-input-voltage contactor are consistent under AC / DC input voltages is achieved, and the circuit is simple and easy to use, thereby finally realizing the universality of the AC / DC contactor power saver product, and reducing the production and inventory pressure of the manufacturer.

Description

technical field [0001] The invention relates to the field of AC contactors, and in particular relates to a detection circuit for a power saver of a contactor. Background technique [0002] The traditional contactor operating system consists of a coil, a static iron core, an armature and a reaction spring. When the contactor coil is energized, a suction force is generated between the static iron core and the armature. When the suction force is greater than the spring reaction force, the armature is attracted to the static iron core until it contacts the static iron core. At this time, the main contact is closed. This process is called suction. combined process. The process in which the coil is continuously energized, the armature is in contact with the static iron core, and the main contacts are in a closed state is called the holding process. When the current in the coil is reduced or interrupted, the suction force of the static iron core to the armature decreases. When th...

AI Technical Summary

Problems solved by technology

In the case of AC and DC, if simple voltage division sampling and threshold comparison are used, then in the case of AC input, it will be triggered at a lower voltage, resulting in inconsistent operating voltages between AC input and DC input.

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