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A novel energy-retaining power supply for AC arc welding machines is proposed in this paper. In this kind of power supply, current-steering diodes connected across the output chokes keep the inductor current continuous and retain the energy during the commutation period, hence reducing the commutation time to ensure a better welding performance. In addition, the stored energy can be released in the next energy transfer cycle to raise the conversion efficiency. The circuit operations and design procedures are likewise examined thoroughly. Experimental results on a prototype inverter for driving a 100-A AC arc welding machine are recorded to validate the effectiveness of the presented scheme.

Summary This paper proposes a simple control scheme for single‐phase power factor correction (PFC) regulators, which provides the advantages of low current harmonic distortion and rapid transient response. Moreover, the proposed scheme needs only to add two sample‐and‐hold control circuits into the feed‐forward voltage loop and feedback‐voltage loop of PFC regulators. Accordingly, the system is not influenced by the 120‐Hz ripple voltage but improves the transient response time and input current harmonic distortion. The operating principles and control scheme are analyzed in detail. A 300‐W boost power factor corrector prototype is implemented to verify the feasibility of the proposed scheme. The experimental results are satisfactory. Copyright © 2014 John Wiley & Sons, Ltd.

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