High-frequency high-voltage arc ignition circuit

Abstract

The invention discloses a high-frequency high-voltage arc ignition circuit, and relates to the technical field of arc ignition circuits. The two ends of a secondary side of a main transformer are in series connected with a fifth diode and a sixth diode; a series circuit which is composed of a first bypass capacitor and a second bypass capacitor, a series circuit, a piezoresistor, a ninth resistor and a tenth capacitor are separately connected between a negative electrode end of the fifth diode and a natural point of the main transformer; the series circuit consists of an eleventh diode, an eleventh resistor and an eleventh capacitor which are connected in parallel; the positive electrode end of the fifth diode is sequentially connected with a switch and a second capacitor until a dotted terminal of a primary side of a high-frequency boosting transformer; and a dotted terminal and a non-dotted terminal of the secondary side of the high-frequency boosting transformer are sequentially connected with a second resistor and a high-frequency arc igniter until the dotted terminal. The high-frequency high-voltage arc ignition circuit is high in arc ignition success rate, is strong in anti-jamming capability, is low in fault rate, and is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of arc striking circuits, in particular to a high-frequency and high-voltage arc striking circuit. Background technique [0002] Argon arc welding and cutting machines in the existing market are accompanied by high-frequency arc ignition circuits, but the biggest defect of the arc ignition circuit is that the success rate of arc ignition is not high, the anti-interference is poor, and the failure rate is high. At the same time, it also has an arc maintenance circuit. , the cost is also high, commonly used high-frequency arc ignition circuits such as figure 1 As shown, transformer T2, fifth diode D5, sixth diode D6, second inductance L2, twentieth filter capacitor C20, and high-voltage coupling transformer T4 constitute the output part of the frequency conversion circuit of the inverter power supply; the arc striking part The power supply is directly input from the 220V power supply to the high-frequency ste...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the structure of the existing technology is complex, the power supply is directly from 220V, the transformer is large in size, and the success rate of arc starting is not high, and a higher voltage for arc maintenance needs to be provided to make up for it, which leads to the transformer needing to provide a set of arc arc The winding used makes the power of the transformer larger, and the other high-voltage winding has high requirements on electrical insulation, so the cost of the transformer is also very high. The voltage requirement is high, because the voltage of the power frequency 50Hz is used for voltage doubling, and the oscillation frequency generated by the discharge circuit is low, so in the arcing process, sometimes the air cannot be broken down and the arc cannot be started. The device of the voltage doubling circuit Many, the failure rate is also high, plus the addition of the arc circuit, sometimes because the voltage of the high-voltage circuit is high, the output absorption and filter capacitors are only the second inductance L2 and the twentieth filter capacitor C20, the voltage of the high-voltage part It will be connected in series with the arc circuit and the main circuit, which will affect the life of the device and cause hidden dangers to the quality of the product

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