Improvements in power quality and efficiency with a new AC/DC high current converter

A very flexible AC/DC converter featuring high-output current, reduced voltage ripple and highly adjustable current control is described. The whole system consists of four stages and uses a proper switching technique in conjunction with a feedback control performed by means of a PID regulator. Moreover, the built prototype exhibits high efficiency and reduced harmonic pollution. In order to evaluate the harmonic distortion on the current drawn from the supply network, an FFT (Fast Fourier Transform) analysis is performed. Finally, experimental and computation results for output currents up to 400A, which confirm the correct behavior of the proposed converter, are presented and discussed.

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