Switching system giving consideration to electromagnetic compatibility and electrical safety and motor control method

Abstract

The invention discloses a switch system giving consideration to both electromagnetic compatibility and electrical safety and a motor control method, the switch system also comprises two single-pole single-throw relays, a double-pole double-throw relay, two silicon controlled rectifiers and three groups of resistance-capacitance absorbers, one group of contacts of a double-pole double-throw switch uses the resistance-capacitance absorbers, and the other group uses zero-crossing switching. Two groups of contacts in the two single-pole single-throw relays use zero-crossing switching, and finally an electrical interlock circuit is formed and is integrated with a semiconductor switch circuit to form a topological structure. According to the invention, the electrical interlocking of the double-pole-double-throw switch and the mechanical strength determined by the structure of the double-pole-double-throw switch are used, the electrical safety is improved, and the electromagnetic compatibility is improved based on the simultaneous use of zero-crossing switching and resistance-capacitance absorption.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility and electrical safety processing, in particular to a switch system and a motor control method that take into account both electromagnetic compatibility and electrical safety. Background technique [0002] In the design and application of motor forward and reverse power switches for fine and small controllers, there are generally several design schemes as follows: [0003] Option 1: Use a power relay to directly drive the load. Advantages: small size; Disadvantages: large electromagnetic energy and large interference at the moment of switch opening and closing; contact arcing will lead to short life of the switch. [0004] Solution 2: Use semiconductor switches to directly drive the load. Advantages: small size, and can realize alternating current sine wave zero-crossing switching load (hereinafter referred to as zero-crossing switching), and the theoretical electrical life is...

AI Technical Summary

Problems solved by technology

[0003] Option 1: Use a power relay to directly drive the load. Advantages: small size; Disadvantages: large electromagnetic energy and large interference at the moment of switch opening and closing; contact arcing will lead to short life of the switch

[0004] Solution 2: Use semiconductor switches to directly drive the load. Advantages: small size, and can realize alternating current sine wave zero-crossing switching load (hereinafter referred to as zero-crossing switching), and the theoretical electrical life is long; Disadvantages: semiconductor switches have no obvious breaking point, stable In this state, the switch has leakage current, which may easily cause open circuit or electric shock hazard after breakdown

[0007] To sum up, the current solutions are not ideal, either bulky, unable to achieve safety, or meet electromagnetic compatibility, so it needs to be improved

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