全桥逆变电阻焊电源零电压的开通条件
Conditions to Turn on Circuit of Full-bridge Inverted Resistance Welding Machine in Zero-voltage
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摘要: 软开关逆变电源是目前焊接电源研究的热点,移相式零电压逆变电路就是其中之一。本文通过对全桥移相式逆变电阻焊焊接电源工作状态及其各转换阶段的全面分析,得出了实现零电压开通的条件是焊接变压器有足够的储能和控制软件与电路参数的匹配,并对影响实现零电压导通的因素做了细致的分析。在此基础上对分析结果进行了试验验证,得出了与理论分析一致的结论。另一方面试验结果还揭示了采用移相式逆变电路工作方式,尽管由于某些原因使电路不能做到零电压开通,也会使IGBT所承受的电压应力大大降低,从而改善逆变电路的工作状态。Abstract: Soft-switching inverters have been the pupular subject in the welding power source study,and the phase-shifting zero-voltage inverted circuit is one of them.It was concluded that the conditions of realizing the zero-voltage turn-on are the enough energy stored in a welding transformer and the good watch between the control software and the circuit parameters.The comprehensive investigation on the working state and the various transfer stage of full-bridge phase-shifting inverted resistance welding machine and the analysis on the factors effecting the realization of zero-voltage turn-on were also investigated in this paper.The analyzed results were tested and verified through experiment.Moreover,although the zero-voltage turn-on can not be realized duo to some reason,the voltage stress borne by IGBT was greatly decreased and the working state of a inverted circuit was improved,applying the working way of phase-shifting inverted circuit.
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Keywords:
- soft-switching /
- zero-voltage /
- inverter /
- resistance welding machine
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