Intelligent electromagnetic switch control device for low voltage power supply system

Abstract

The invention aims to provide an intelligent electromagnetic switch control device for a low voltage power supply system. The intelligent electromagnetic switch control device is characterized by comprising a voltage conversion module and a current conversion module which are in cascade connection, wherein voltage conversion at the former stage adopts a current mode control manner, and working voltage supplied to the latter stage can be flexibly and quickly adjusted to be higher than the input voltage to conduct current monitoring; the latter stage conducts wave chopping on the output voltage at the former stage, and square-wave voltage is obtained at the two ends of an electromagnetic mechanism, so that an electromagnetic switch is subjected to current close-loop control. According to the device, the higher harmonic oscillation problem caused by boost inductive current instability is eliminated through slope compensation; the boosting conversion at the former stage can also play the power factor regulation function to purify a control power supply; through the adoption of the manner that an advanced control algorithm is coordinated with the ontology design of an electromagnetic mechanism, the optimum control duty cycle adjusting mode is automatically searched, and the optimum duty cycle is limited in a certain range, so that the harmonic component of the current in the retention stage is reduced, and the electromagnetic audio noise is reduced.

Description

technical field [0001] The invention relates to an electromagnetic switch intelligent control device suitable for a low-voltage power supply system. Background technique [0002] Electromagnetic switch is the most commonly used type of control electrical appliance in low-voltage power system, which is composed of electromagnetic mechanism, contact mechanism and linkage mechanism. According to the working requirements of the control object, the electromagnetic mechanism drives the movement of the contact mechanism, which is used for long-distance connection and disconnection of AC and DC main circuits and large-capacity control circuits. The main control object is the motor, and it can also be used to control other electrical loads, such as electric heating. Devices, lighting equipment, electric welding machines, capacitor banks, etc. [0003] There are generally two driving methods for controlling electrical appliances: mechanical signals and electrical signals. The electr...

AI Technical Summary

Problems solved by technology

In the DC voltage holding control, a separate circuit needs to be connected to the coil. As the coil resistance changes, the current on the coil changes accordingly, and the holding force will also change accordingly. It is often necessary to increase the holding voltage to make the holding The release of the magnetic energy of the coil is directly related to the holding voltage. The higher the holding voltage - the greater the magnetic energy of the coil - the slower the release of the electromagnetic mechanism, it will cause the breaking delay

The holding mode of DC current can solve the defect of DC voltage holding, but it brings noise. This noise is different from the AC noise of the electromagnetic mechanism under AC operation, but the high-frequency change caused by the holding state of DC current. Noise, which is an electromagnetic audio noise

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