Arc striking device and method for plasma arcs

Abstract

The invention discloses an arc striking device for plasma arcs. The device comprises: an internal power supply module, an AC-DC conversion module, a boost module and a pulse generation module which are connected in order, and a built-in optical transceiver module connected with the AC-DC conversion module, the boost module and the pulse generation module, wherein the built-in optical transceiver module is connected with a plasma power supply cabinet at the external portion of the device; a direct current signal generated by the internal power supply module is processed by the AC-DC conversionmodule, the boost module and the pulse generation module in order under the command of the built-in optical transceiver module, then is converted to a high-frequency pulse high-voltage signal requiredby the arc strike and is output to the arc strike electrode of a plasma torch to complete arc strike. The arc striking device and method for plasma arcs have the high arc striking success rate, highadaptability to the ion torch and low requirement on wiring, and can be simultaneously suitable for the arc striking of a transferred arc plasma torch and a non-transferred arc plasma torch. The invention also discloses an arc striking method for plasma arcs.

Description

Technical field [0001] The present invention relates to the technical field of plasma arc generation, and more specifically, to a plasma arc ignition device and method with higher requirements for system insulation. Background technique [0002] With the continuous expansion of the application field of plasma technology, the requirements for the stability of plasma operation are getting higher and higher, and it is particularly important to improve the success rate of plasma arc ignition. The current ignition technology of plasma arc adopts single-phase AC power supply from the power grid, and the ignition is realized through smoothing reactors, isolation transformers, arc ignition cabinets, plasma generator cathodes and plasma generator anodes (for example, refer to China Invention patents CN201721369713, CN201820548927). [0003] In the above-mentioned prior art, since the energy of the arc and the arc starting is supplied by the power grid, the electrical isolation of the arc a...

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Problems solved by technology

[0003] In the above-mentioned prior art, since the energy of the arc and arc ignition is supplied by the power grid, the electric isolation of the arc and arc ignition device and the grid is isolated by a transformer. This isolation method will be impossible due to the influence of the distributed capacitance of the device. Complete electrical isolation

In addition, in arc applications, the insulation reduction between the arc electrode (cathode or anode) and the ground will affect the stability of the arc high voltage, thereby affecting the success rate of the arc

For example: in the production of conductive powder, metal powder will adhere to the vicinity of the electrodes, resulting in a decrease in the insulation resistance between the arc striking electrodes or between the arc striking electrodes and the ground, which greatly reduces the success rate of arc striking

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