Air plasma cutting machine
A technology of air plasma and cutting machine, which is applied in the direction of plasma, plasma welding equipment, electrical components, etc., can solve the problems of large volume and weight of cutting machine, achieve good dynamic characteristics, improve output power and reliability, and small size Effect
Inactive Publication Date: 2012-01-25
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology
But its disadvantage is: the volume and weight of the unit output power of the cutting machine are relatively large.
Method used
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[0015] like figure 1 , The power supply circuit of the present invention includes a main circuit and a control circuit, and the main circuit is composed of a front-stage main circuit and a rear-stage main circuit. The front-stage main circuit is connected to the left side of the primary side of the main transformer, and the rear-stage main circuit is connected to the right side of the secondary side of the main transformer. The front-stage main circuit is composed of an AC power supply, an input rectification filter circuit and a full-bridge inverter circuit in series. The main circuit of the latter stage is composed of an output rectification filter circuit, a high-power switching circuit and an output reactor. The control circuit is composed of a front-stage control circuit and a post-stage control circuit. Among them, the front-stage control circuit is connected to the full-bridge inverter circuit by the front-stage constant frequency constant pulse width circuit and the f...
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The invention discloses an air plasma cutting machine, comprising a main circuit and a control circuit. The main circuit is composed of a superior main circuit and an inferior circuit which are connected in series. The superior main circuit is composed of an alternating current (AC) power source, an input rectifying wave filter circuit and a full bridge inverter circuit which are connected in series. The inferior main circuit is composed of an output rectifying wave filter circuit, a high power switch circuit and an output resistor. The control circuit is composed of a superior control circuit and an inferior control circuit, wherein the superior control circuit is connected with the full bridge inverter circuit through a superior frequency determining and pulse-width determining circuit and a superior drive circuit which are in series connection. The inferior control circuit is composed of a current detecting circuit, a given circuit, a comparison amplifying circuit, a PWM circuit and an inferior drive circuit, which connects the current detecting circuit with the comparison amplifying circuit. Under the mutual function of the superior inverter and the inferior chopper, the invention can obtain an external feature of constant current and a good dynamic feature; thereby obtaining a high-quality welding seam with small volume, light weight, convenient movement, material saving,and high efficiency and energy reserving.
Description
technical field [0001] The invention relates to an air plasma cutting machine, in particular to its power supply circuit. Background technique [0002] The air plasma cutting machine is mainly used in metal and non-metal cutting, and belongs to the technical field of air plasma cutting equipment. Air plasma arc cutting is a cutting method using high-temperature and high-speed heat flow generated by a high-energy-density compressed arc. The movement of the plasma arc torch forms the kerf. Compressed air is used as the ion gas for plasma arc cutting. The gas source is convenient and the cutting cost is low. Due to the high heat enthalpy of the plasma arc and the heat release during the interaction between oxygen and metal, the cutting speed is increased and the incision quality is good. . In recent years, it has developed into one of the most widely used plasma cutting methods. [0003] With the development of power electronic components and the improvement of their perfor...
Claims
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IPC IPC(8): B23K10/00H05H1/36
Inventor 方臣富朱泉邵江艳
Owner JIANGSU UNIV OF SCI & TECH