High-voltage DC (direct current) switching circuit and switching-on/off method thereof

Abstract

The invention discloses a high-voltage DC (direct current) switching circuit and a switching-on / off method thereof. In the circuit, two ends of an electronic switch are connected with one isolated relay switch in series respectively and then connected with a main relay switch in parallel; and carrying out certain control to realize the vertically safe running of high-voltage DC. In the method, the electronic switch is combined with a relay, a singlechip is used to control, and a frequency modulation technology is used in switching on the electronic switch, so that the serious problems, including arc discharge adhesion, poor safety, incapability of separation and large radiating volume, existing in applications of the DC switch in the high-voltage DC field are solved in principle, the switch is separated fundamentally and the safety problem of like products can be solved. According to the invention, the structure is simple, the cost is low, the remote control is realized, the reliability is high and the applied range is wide.

Description

technical field [0001] The invention relates to a switch circuit, in particular to a DC switch circuit for high voltage and high current and its on-off method. Background technique [0002] With the continuous development of power supply technology, in order to improve the transmission efficiency, save energy, reduce the interference of AC power, and reduce the conversion link, the high-voltage and high-current DC bus power supply method is more and more widely used, and the high-voltage and high-current DC switch demand is increasing. [0003] At present, some industries provide devices for high-voltage DC switches, and there are the following problems: 1. The electromagnetic relay circuit connects and disconnects the main circuit through the control coil. The existence of the potential difference between the two ends of the switch, when connected, the instantaneous large current can cause the contacts of the relay to generate high temperature and cause the contacts to sti...

AI Technical Summary

Problems solved by technology

[0003] At present, some industries provide devices for high-voltage DC switches, and there are the following problems: 1. The electromagnetic relay circuit connects and disconnects the main circuit through the control coil. The existence of the potential difference between the two ends of the switch, when connected, the instantaneous large current can cause the contacts of the relay to generate high temperature and cause the contacts to stick together, making the relay invalid, and when the main circuit is disconnected, due to the instantaneous separation of the contacts, large Arcing phenomenon occurs due to potential difference, which affects its reliability; 2. The electronic switch uses semiconductors as the switching medium, which prevents the occurrence of arcing phenomenon in principle, but it is not physically isolated, and due to the existence of RDSON, its power Large consumption

[0004] How to overcome the long-term arcing and safety problems in the current high-voltage switching circuit has become a technical problem that needs to be solved

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