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Multipulse thyristor converters are being employed in industrial applications to control output current/voltage through adjustment of the thyristors' triggering angle. For reduced loading conditions, the triggering angle may be raised resulting in low power factor and a high total harmonic distortion (THD) in the source current. In addition, under light loads, overall system efficiency is reduced...
A technique to achieve an efficient and low-cost three-phase controlled rectifier with a power factor of unity is described. This is based on replacing the bulky transformer/inductor commonly used for current injection by lightweight static switches. The proposed technique can be applied as a retrofit to a variety of existing thyristor converters. It consists of a three-phase thyristor bridge, three...
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