Direct stored energy control system of plasma-cutting power source and control method thereof

Abstract

The invention relates to a direct stored energy control system of a plasma-cutting power source and a control method of the direct stored energy control system. The system comprises a power circuit and a control circuit, wherein the power circuit comprises a voltage reduction circuit and a chopper circuit. The voltage reduction circuit is an industrial frequency transformer which comprises a primary coil and two secondary coils, the chopper circuit comprises two BUCK circuits in parallel, and the two BUCK circuits are connected with the two secondary coils respectively. According to the direct stored energy control system of the plasma-cutting power source and the control method of the direct stored energy control system, the output direct current can be supported to reach 260A, the circuits are simple, controlling is convenient, and meanwhile the direct stored energy control system and the control method have the advantages of being high in input power factor (larger than 0.96), low in ripple of the output direct current and the like.

Description

technical field [0001] The invention relates to a control system and a control method thereof, in particular to a system for direct energy storage control of a plasma cutting power supply device, which belongs to the fields of plasma cutting and power electronic conversion. Background technique [0002] The machine plasma cutting device is composed of mechanical equipment, electric control equipment, gas supply equipment, etc. The electric control equipment includes power supply system, numerical control system, cutting torch system and ECAN bus, and the power supply system includes plasma cutting power supply, arc ignition box, Air control box, cooling system, pipeline and other main parts; [0003] Plasma cutting power supply is one of the core components of machine plasma cutting devices. According to the development history, it can include various silicon rectifier power supplies, thyristor rectifier power supplies, inverter power supplies, and chopper power supplies. A...

AI Technical Summary

Problems solved by technology

Among them, the quality of DC power supply includes voltage stability, peak-to-peak value of ripple and ripple frequency. If these indicators are poor, the ripple of the cutting current will be large, and the cutting quality must be poor.

To this end, these indicators need to be improved. At present, the common method is to increase the capacitance of the electrolytic capacitor, but blindly increasing the capacitance of the electrolytic capacitor will also bring about low-frequency oscillation, cost, and excessive volume. Therefore, high-power design and output current refinement are important The problems that must be faced and solved by interlaced parallel plasma cutting power supply;

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