A new soft-switched AC/DC PWM power converter structure is presented. It is useful for current-fed inverters and PWM rectifiers. Typical applications are magnet power supplies, high-power AC motor drives and active power filters with magnetic energy storage. Soft switching is provided at the expense of a limited increase of the circuit complexity as compared to usual hard switching solutions. A discussion of the soft commutation process is presented. By a proper switching sequence, overvoltages across the power converter switches can fully be eliminated. Moreover, light-load operation can be achieved. Both typical limitations of soft-switched current-fed topologies are therefore overcome. Simulation and experimental results demonstrate the actual power converter capabilities.
Performance Improvement of Soft-Switched PWM Rectifiers with Inductive Load
ROSSETTO, LEOPOLDO;TENTI, PAOLO;
1994
Abstract
A new soft-switched AC/DC PWM power converter structure is presented. It is useful for current-fed inverters and PWM rectifiers. Typical applications are magnet power supplies, high-power AC motor drives and active power filters with magnetic energy storage. Soft switching is provided at the expense of a limited increase of the circuit complexity as compared to usual hard switching solutions. A discussion of the soft commutation process is presented. By a proper switching sequence, overvoltages across the power converter switches can fully be eliminated. Moreover, light-load operation can be achieved. Both typical limitations of soft-switched current-fed topologies are therefore overcome. Simulation and experimental results demonstrate the actual power converter capabilities.
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