| The application of the inverter technology in the welding power supply contributes to an obvious improvement of the welding apparatus in the miniaturization and highly effective aspect. At the same time, the good dynamic characteristic of the arc-welding inversion power supply provides an abundant platform for the welding craft controlling. With the improvement of power electronics technology, especially the emergence of the power element MOSFET,IGBT, arc welding inverters are going to be the most prospective welding power supply in the welding field. They have many good qualities, such as small volume, lightness, high efficiency and rapid dynamic response. Inverter welding power is recognized as the most promising of welding power source, and is gradually replacing traditional welding power source is widely used in the manufacture of various fields.This paper first reviews the history of the development of welding power source, welding power source from the initial transistor control, and to the inverter control now, the future will continue to develop high-performance advanced features a power inverter welding power source at this stage to the development a wide range of concerns. Along with power electronic devices and the development of technology, the inverter welding power source has broad space for development, its high efficiency and energy saving, the provincial build, lightweight, dynamic characteristics of good regulation and control, and many other advantages by the manufacturers and users of the acclaim. Inverter welding power source is internationally recognized the most advanced welding machine, and most of the development potential of a welder. To sum up, this portable inverter welding power source with the development of a practical significance. Together with the research and use of, the preliminary design of the welding of the main performance parameters identified.Secondly, we designed a portable inverter welding power source circuit and the main control circuit. Since the introduction of inverter technology, according to the needs of load designed AC→DC→AC→DC inverter welding inverter system to build the main power supply circuit. Through the different inverter main circuit, the choice was widely used full-bridge inverter main circuit, it raised the utilization of the device, for circuit design and testing to provide more convenient. Inverter power switching device design choice is the focus of inverter main circuit, in accordance with the desired design needs, and compare a variety of switching devices and the use of the performance, chose this design as a MOSFET power switch components, and calculated in the circuit parameters. The MOSFET switching frequency can easily reach 100 kHz and 20 kHz audio is the limit, no more than it can be heard advice, just noise, noise pollution reduction machines will be very useful. Usually that the best frequency inverter circuit is taken into account on the basis of natural frequencies should be used in power switching device can accept the highest frequency, although this could reduce the size of high-frequency transformer, but also high-frequency inverter transformer leakage reactance to deteriorate, radiators and other negative effects of increased volume, comprehensive consideration of the selected 100 kHz frequency inverter. Identify the power switch components and inverter frequency, and high frequency transformer design, analysis of its transient saturation, and other issues. On the basis of the above, the design of portable power inverter welding the main circuit and draw a circuit diagram, and the working principle of circuit was analyzed. As for the selection of MOSFET power switching device, the switching losses small, high switching frequency, using the traditional hard-switching PWM pulse width modulation circuit as the main control circuit, but not now widely recommended by the selection of soft-switch technology. Hard PWM duty cycle switching technology to control the way to achieve power conditioning, circuit structure is simple, convenient control, steady-state load DC gain and nothing to do (discontinuous conduction), and other advantages, a time in the DC-DC, DC-AC converter dominated, development speed very quickly. SG3525 use dedicated chip PWM pulse width modulation circuit design, pulse drive circuit. Control circuit and system design and a variety of anti-jamming circuit protection circuit for welding the stability and reliability of the work laid the foundation. In this paper, the large-scale use of a mature integrated control module and a control circuit and trigger circuit to accurately meet the design requirements.Finally, this paper the basis of the above design, a self-made portable inverter welding power source. After the design and debugging, portable inverter welding power supply reliability, efficiency and welding quality have greatly increased, and its size and weight have been noticeably reduced to the original design requirements. Based on experimental results verify the correctness of the design of portable inverter welding power source and the fine performance. Clearly, the portable inverter welding power source as the basis of the nature of Research and Development, have been successful. |
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