In this paper, a multifunctional welding machine is designed with the characters of high power factor, soft switching and portable remove.

本文设计了一种适用于中大功率、便携式逆变焊机，具有电源输入侧功率因数高，主功率器件实现软开关等特点。

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Soft, but sturdy wedges perfectly apply and blend foundation for a smooth, flawless look. Convenient portable case is perfect for cosmetic bag storage.

海绵表面柔软，内里结实，令粉底妆容更加顺滑、无暇。附有方便携带的盒子，可以放进随身化妆包里。

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This paper introduces the circuit topology of portable inverter arc welder with soft snubber, mainly power circuit is a double switch forward converter with assistant resonant circuit.

主电路采用具有无源辅助谐振网络的双管正激变换器，与普通双管正激变换器相比，功率管开关状态得到较好的改善，同时并没有增加电路的复杂性。

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