which Uf = XLIL = LILS

PWM inverter arc welding MATLAB simulation study


=- A 21 +11 C1S) =- (Kp + I / T ~ S), which Kp = R2,franklin and marshall uk, = feet lC, available = 1 / = a (K1 / S) (Factory f,) = 1 / z (fJ_f). Stable current adjustment process as follows: 0 increased, increases, decreases, pulse width modulated duty cycle is reduced,, 0 decreases, which constitutes the current negative feedback. , 0 the adjustment process similar decreases. 1.2 Ⅳ M nonlinear MTLAB inverter welding power supply simulation model previously analyzed the PI correction part of the principle areas and PWM. Power conversion part of the complex frequency domain has the following relationship: Uo = + Uo, which Uf = XLIL = LILS,, 0 (according to Kirchhoff's voltage law). llc + lo. One, c = / Xc, Xc = l / CS. u,, = 1oRfIn (according to Kirchhoff's current law). PWM power conversion part and the part of the strong linear link, using Simulink,abercrombie copenhagen, the ToolBox,ed hardy udsalg, through the design can simulate the working process. Figure 1 shows for the forward converter, chopper, part of the pulse transformer step-down conversion and single-tube IGBT. The resulting PWM inverter welding power forward full nonlinear Matlab simulation model, shown in Figure 3. Figure WM inverter welding power nonlinear MATLAB simulation model '26 'g cream research and design of the country covered Zhi-Wu, etc.: PWM inverter arc welding MATLAB simulation of the l 2 phase constants in Figure 3,franklin marshall outlet, pulse generator,franklin and marshall sale, sum of 1 and 4 and switch modules PWM link between simulation model; and the sum of 3 and between the modules PI correction part of the simulation model; and the sum of 1 and its power conversion between the modules (main circuit) part of the simulation model. The rest of the oscilloscope used to display and work space modules and output simulation results, the dynamic process curve. g and h and between the PWM inverter module can simulate the load resistance changes the whole situation, when connected to the main circuit using the simulation model corresponding to g and h point. Time used to display simulation time. > 2 simulation and the results made by running the simulation model we have the following results (see Figure 8). Made one. A 50 part of the work process diagram 4PWM waveform ... i, a ● ● ii'l ●!! Jj. One. ,ralph lauren polo,. 2911. . First,ed hardy, a. A '[' a _t / ms Figure 5 in the inductor L and the corresponding voltage and current changes in diagram 250200l5O ≤ 10050O a 5Ot/ms Figure 6 Output current, the inductor current and capacitor C in the current waveform diagram 7PWM t} s output pulse, the inductor voltage and inverter output waveform and the corresponding variation of I | C Si a curve 8O60 words 4o20OR/nbUo-R curve 8 load changes throughout the inverter output current, voltage and load resistance between The curve 5PWM aspects of the work process waveform shown in Figure 4. Curve a, b, c, d corresponding to Figure 3, the corresponding point waveforms. Figure 8 feet for the load resistance changes in the 0.01-10Q inverter output current, 0, voltage and load resistance and the relationship between the curves. Figure 8a for the foot curve, Figure 8b for the foot curve, Figure 8c for the curve in Figure 8d for the foot curve. Delete the inverter and the simulation L = 100, C = 150trF,ed hardy danmark, switching frequency 25kHz, KP = 6.2, K. -0.5. The simulation results in line with the actual power supply to prove the correctness of the model. Inverter of this study is typical of coated electrodes arc welding inverter, inverter Figure 8c is typical of such external characteristics (volt-ampere characteristic) curve,ralph lauren skjorter, the working current 130-180A, the arc welding operations in short-circuit conditions with a natural drag of the outer. This study established Maflab simulation model for single-transistor forward PWM inverter welding power source; the model is to carry out such analysis and arc welding inverter aided design powerful and effective tools (the model also applies to the PWM type single-transistor forward switching power supply simulation analysis and research 1. References: [1] Lu Zhiguo. the power of computer simulation technology chat HE Beijing: Science Press, 2001 [2] Ouyang dawn. MATLAB control system design [l. Beijing : National Defence Industry Press, 2001 [3] Zhangzhan Song, Cai Xuan three. switching power supply schematic and design [M], Beijing: Electronic Industry Press, 1999. [4] Xue Dingyu. feedback control system design and analysis - MArI 'IAB language applications [hI]. Beijing: Tsinghua University Press,abercrombie paris, 2000 [5] Shi-Sheng Huang. a new arc welding power source and intelligent control, Beijing: Mechanical Industry Press, 2000.

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