A new input-voltage feedforward harmonic-injection technique withnonlinear gain control for single-switch, three-phase, DCM boostrectifiers

摘要

A new input-voltage feedforward harmonic-injection technique for ansingle-switch, three-phase, discontinuous-conduction-mode boostnrectifier is introduced. With this technique, rectification with a lowntotal harmonic distortion that meets the IEC555-2 requirements can benachieved. In addition, the rectifier shows an excellent transientnperformance which dramatically reduces the rectifier's output voltagenovershoots during line-voltage step-up transients. Moreover, by thenaddition of a nonlinear gain-control circuit, the DC gain of the DCMnboost rectifier at light load is adaptively reduced so that thenstability of the rectifier at light load is achieved. The performance ofnthe proposed injection technique was verified on a 6 kW prototypenrectifier