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A 3-Leg Inverter-Based High-Frequency Welding Power Supply Capable of AC 220 and 440-V Operation
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2021-05-25 , DOI: 10.1109/tpel.2021.3082945
Duk-Hyeon Yun , Woo-Seok Lee , Jun-Young Lee , Il-Oun Lee

In this article, a dc/dc topology is proposed for welding power supply that achieves a high conversion efficiency of over 94%, requiring ac 220 and 440 V operation. The secondary-side structure of the proposed topology is the same as that of conventional welding power supplies but the primary side consists of a three-leg inverter structure and a high-frequency transformer with two primary windings connected in series. Due to this structure, it is possible to operate in a wider input voltage range than conventional welding power supplies without significant loss of performance. In addition, it has the advantage of achieving high conversion efficiency over the entire input voltage range by reducing primary current stress and secondary rectifying voltage stress due to an increase in turn-ratio, and a reduction in circulating current. This advantage allows the use of mosfet s rather than insulated gate bipolar transistor (IGBTs) with low operating frequency, which are often used in conventional welding power supply applications. Using a mosfet reduces the size of the power-stage passive devices, thereby reducing the overall system size. The performance of the proposed topology is verified in prototypes with a switching frequency of 100 kHz, an input voltage of 311/622 V, an output of 50 V, and a 6.0 kW class specification.

中文翻译:

一种基于 3 脚逆变器的高频焊接电源,能够在 220 伏和 440 伏交流电压下运行

在本文中,提出了一种用于焊接电源的 DC/DC 拓扑,该拓扑实现了超过 94% 的高转换效率,需要在 220 和 440 V 交流电压下运行。所提出拓扑的次级侧结构与传统焊接电源相同,但初级侧由三脚逆变器结构和具有两个初级绕组串联的高频变压器组成。由于这种结构,可以在比传统焊接电源更宽的输入电压范围内工作,而不会显着降低性能。此外,它还具有通过降低由于匝数比增加和环流减小引起的初级电流应力和次级整流电压应力,在整个输入电压范围内实现高转换效率的优点。mosfet s,而不是具有低工作频率的绝缘栅双极晶体管 (IGBT),后者通常用于传统的焊接电源应用。用一个mosfet 减小了功率级无源器件的尺寸,从而减小了整个系统的尺寸。所提出的拓扑的性能在具有 100 kHz 开关频率、311/622 V 输入电压、50 V 输出和 6.0 kW 等级规格的原型中得到验证。
更新日期:2021-07-30
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