Integrated controller for meter and electrical appliance

Abstract

This invention relates to a combined control device for integrated instruments and electric appliances composed of a shell with a faulty display window and labels, an electronic control circuit, an intelligent expanding module circuit, a moving and static contactor component with a current sensor at the side of a static contact bridge, an iron core, a coil and a spring, which realizes multiple kinds of protections and fault display by the electronic control circuit and has the function of power saving, a photo electric isolation technology is applied for its high voltage drive and low voltage signal circuit and the I / O expanding interface and an intelligent expansion module are applied to enrich the function of the display and control of the instrument.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical appliances and automatic instruments. Background technique [0002] In the field of traditional industrial automation control, there are mainly two categories of electrical appliances and instruments. Among them, low-voltage electrical components mainly include AC contactors, thermal relays, current relays, voltage relays, time relays, leakage protectors, phase failure protectors, etc. These products Single function, generally can not work alone, and automation instrument is mainly divided into detection instrument, display instrument, control instrument and actuator, they are responsible for the detection, display, control and other functions of industrial physics, chemistry, length, weight, electricity and other parameters , is the sensory and nervous system of the automation system. They do not have the ability to directly drive the motor or control high-power equipment. They must cooperat...

AI Technical Summary

Problems solved by technology

[0003] In the current actual industrial automation control, the electrical automation system or industrial automation instrument control system is often completed by the cooperation of various electrical components, display and control instruments. The comprehensive power consumption is large, the contacts are many, the reliability is poor, the comprehensive cost is high, and a lot of platinum, silver, copper and other metals and other resources are wasted. Although the "KB0-T intelligent control and protection switch developed by Shanghai Electric Technology Institute "Electrical appliances" and "A series intelligent contactor" of Westinghouse Electric Company of the United States came out, but due to the complex structure and high cost, general users cannot accept it, and the functions are still not perfect. Even though the published Chinese invention patent 92114900.X "universal multifunctional contactor" has more protection functions and ports with expandable functions, it still has certain shortcomings: 1. Electronic control circuit and expansion circuit and high-voltage power supply Shared neutral ground wire, no isolation measures, easy to make electronic control circuit, expansion circuit and sensor with high voltage, there is a big safety hazard, and even endanger the life safety of users. Provide intuitive fault prompts, which is not convenient for timely troubleshooting. Third, it only provides a simple input expansion interface, no output port to transmit the status of the machine to the outside, and no fault alarm function. It can be said that it is not a real I / O O port, 4. There is no ability to directly expand analog quantity control, and there is no display function of main circuit current, set value current, power supply voltage and other analog quantities. 5. The working power supply capacity of the electronic control circuit is small, and the drop-down resistor is easy It generates heat and cannot provide a large current to the expansion circuit. Sixth, the power-saving function of the electronic control circuit is based on the switching state of high voltage and high current with pulse width modulation, which has high requirements for electronic components and poor safety and reliability.

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