A multi-module parallel current-sharing circuit and control strategy for brick power supplies

Abstract

To address the issue of unbalanced output currents in multi-module parallel power applications, this paper proposes a novel parallel current-sharing circuit structure and control strategy, which is suitable for the standard packaging of brick power supplies. This approach eliminates the need for additional controllers and current-sharing circuits and can enhance system stability and reliability. Furthermore, this paper introduces a design method for multi-order RC low-pass filters in series, effectively reducing voltage ripple and improving ADC sampling accuracy. To validate the proposed theory, a simulation model was developed using two 2 kW full-brick power converters. The results demonstrate that the proposed method significantly improves current-sharing accuracy compared to systems without a current-sharing control strategy.