Low-voltage holding contactor

Abstract

The invention relates to a non-permanent magnetic low-voltage holding AC contactor with a built-in circuit. A polarity conversion circuit of the contactor is formed by a rectifier bridge D1; when an AC power supply is switched on, a rectifier circuit supplies a DC power supply to the power supply circuit; and when a DC power supply is switched on, positive and negative poles are converted. The power supply circuit respectively supplies power to the input ends of a starting control circuit and a holding control circuit which are connected with the power supply circuit and are mutually independent, thereby avoiding mutual interference between the circuits when a suction control circuit and the holding control circuit act. A starting coil L1 is connected between the grounding end of the polarity conversion circuit and the output end of the starting control circuit, and the starting control circuit supplies suction current to the starting coil L1 through a diode D5 which is connected withthe starting coil L1 in parallel. An auxiliary holding excitation coil L2 is connected with the starting coil L1 in series, and the holding control circuit supplies stable holding voltage to the starting coil and the auxiliary holding excitation coil through a diode D6. The auxiliary holding excitation coil can adjust the holding current by increasing the coil resistance. The contactor can realize national first-grade energy consumption.

Description

technical field [0001] The invention relates to the field of AC contactors, in particular to a power-saving AC contactor with a built-in low-voltage holding control circuit, which can be applied to conventional AC contactors. Background technique [0002] AC contactor is a low-voltage electrical appliance that is safe to use, easy to control, and widely used. Its operating electromagnetic system generally uses AC control power. The traditional AC contactor is based on the working principle of "power-on pull-in, power-on hold, power-off release". During operation, the hysteresis loss and eddy current loss in the iron core and short-circuit ring account for more than 90% of the total energy consumption, and Accompanied by the disadvantages of low power factor, high noise, contact bouncing and coil temperature rise, it increases the power loss on the grid line and shortens the service life of the contactor coil. In order to improve this operating condition, the State Council o...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-permanent magnet low-voltage holding contact whose holding power can reach the national level 1 energy efficiency level in order to solve the problem that the energy efficiency level of the mainstream AC contactor in the existing market is at most between level 3 and level 2. device

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