Capacitor voltage reduction cascade type multi-path intelligent sub-control contactor

Abstract

The invention relates to a capacitor voltage reduction cascade type multi-path intelligent sub-control contactor. After the voltage reduction and rectification of a capacitor, a plurality of paths ofstabilized voltage supply circuits and relays are superposed and connected in series; a single-chip microcomputer respectively controls a plurality of optical coupling isolators to correspondingly control the plurality of relays; the current of a voltage reduction loop of the capacitor is reduced by multiple times; three large-current single-contact relays are respectively used as a group of relays, two groups of relays or a plurality of groups of relays to increase power and simultaneously close to replace three-phase contacts of a three-phase alternating current contactor to control a motor,or two or four groups of relays are respectively controlled to close to realize the condition that the alternating current contactor controls a plurality of motors or the motors to rotate positivelyand negatively; and the motors can be protected and controlled, a plurality of large-current single-contact relays sequentially or simultaneously close the motors M1, M2, M3, M4, M5 and M6 under the control of the single-chip microcomputer, and the group control of a plurality of single-phase motors and the like can be conveniently realized.

Description

technical field [0001] The invention relates to the field of direct current power supply and motor control, in particular to a multi-channel intelligent sub-control contactor of capacitor step-down cascading series. Background technique [0002] In the past, most three-phase AC motors were controlled by AC contactors, and DC relays were generally required to control AC contactors in slightly complicated circuits such as intelligent control or protectors. There were defects such as high cost of AC contactors and complicated circuits. If there are multiple relays in the voltage stabilized power supply, it is necessary to select a large-capacity capacitor, and the stabilized voltage power supply also needs to select components with larger power, which has the defects of large space occupation and high cost, and for small power control circuits. The AC contactor is inconvenient to be installed on the circuit board, which is unfavorable for the integrated circuit of intelligent p...

AI Technical Summary

Problems solved by technology

[0002] In the past, most three-phase AC motors were controlled by AC contactors, and DC relays were generally required to control AC contactors in slightly complicated circuits such as intelligent control or protectors. There were defects such as high cost of AC contactors and complicated circuits. If there are multiple relays in the voltage stabilized power supply, it is necessary to select a large-capacity capacitor, and the stabilized voltage power supply also needs to select components with larger power, which has the defects of large space occupation and high cost, and for small power control circuits. The AC contactor is inconvenient to install on the circuit board, which is unfavorable for the integrated circuit of intelligent protection control, and the high cost for the group control of multiple single-phase motors.

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