Abstract
According to the soft-switching pulsed SAW (Submerged arc weld) weld power supply based on the double closed-loop constant current control mode, a small signal mathematic model of main circuit of soft-switching SAW inverter was established by applying the method of three-terminal switching device modeling method, and the math-ematic model of double closed-loop phase-shift control system circuit was established by applying the method of state-space averaging method. Dynamic performance of the inverter was analyzed on base of the established math-ematic model, and the tested wave of dynamic performance was shown by experimentation. Research and experimentation show that relation between structure of the power source circuit and dynamic performance of the controlling system can be announced by the established mathematic model, which provides development of power supply and optimized design of controlling parameter with theoretical guidance.
Highlights
The full-bridge phase-shift zero-voltage soft-switching PWM inverter now is widely used in the weld field for its many excellent performances
According to the soft-switching pulsed SAW (Submerged arc weld) weld power supply based on the double closed-loop constant current control mode, a small signal mathematic model of main circuit of soft-switching SAW inverter was established by applying the method of three-terminal switching device modeling method, and the mathematic model of double closed-loop phase-shift control system circuit was established by applying the method of state-space averaging method
Research and experimentation show that relation between structure of the power source circuit and dynamic performance of the controlling system can be announced by the established mathematic model, which provides development of power supply and optimized design of controlling parameter with theoretical guidance
Summary
The full-bridge phase-shift zero-voltage soft-switching PWM inverter now is widely used in the weld field for its many excellent performances. Through establishing mathematic model and transfer function of soft-switching pulsed metal active gas welding power supply, the relation between structural parameters of circuit and dynamic performance of system is obtained, which is an effective method of designing and development of that power supply [1,2]. In the field of power electronics, problem of linear PWM DC-DC converter modeling was solved, there are many methods of modeling such as three-terminal switching device modeling method, data-sampling, symbol analysis and so on [3,4,5,6], and method of space state average applied to inverter modeling [7,8,9,10], which provide mathematic model of soft-switching pulsed metal active gas welding power supply with theoretical guidance. Dynamic performance of the inverter is analyzed, and tested wave of dynamic performance is shown to prove the rationality of the inverter by experimentation
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