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Chen Shujun
College of Mechanical Engineering & Applied Electronics
Technology,
Beijing University of Technology,
Beijing 100022, China
Wang Jun
College of Material Science
and Engineering,
Hebei University of Science
and Technology,
Shijiazhuang 050054, China
Huang Pengfei
Lü
Yaohu
Yin Shuyan
College of Mechanical Engineering & Applied Electronics
Technology,
Beijing University of Technology,
Beijing 100022, China |
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SIMULATION AND EXPERIMENTATION OF THE
ARC WELDING INVERTER
USING THE SOFT SWITCHING
TECHNIQUE*
Abstract:
The FB-ZVZCS-PWM converter is realized by the way of subjoining block-capacitor into the FB-ZVS-PWM converter. At the freewheeling interval, the primary current is attenuated fast to zero and maintained. And then, power device of the static leg becomes a zero-current-switch (ZCS), power device of the shifted leg becomes a zero-voltage-switch(ZVS). Thus, on one hand IGBT (Insulated gate bipolar transistor) with tail current can be easily used in full-bridge soft-switching converter; on the other hand additional circuiting energy is greatly reduced. At the same time, less duty cycle loss, lower secondary parasitic resonance, wider soft-switching load range can be achieved. Based on the existing component models in the Pspice software package, a combined model of IGBT is established, in which a non-linear capacitor is introduced to replace the parasitic capacitor. Using this model, computerized simulation is conducted for the FB-ZVZCS-PWM soft-switching converter, the switching and energy-transferring characteristics of the power device are analyzed. Finally, based on the achievement above, a 10 kW arc welding inverter with FB-ZVZCS-PWM converter is developed. The simulation results are testified by experiments. It is proved that by adopting appropriate models, computerized simulation is an effective and useful tool for the development of the arc welding inverter.
Key words: Arc welding inverter Soft switching Zero-voltage-switching(ZVS) Zero-currentswitching(ZCS)
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