Current distribution for parallel-connected DC power sources without remote sensing

Abstract

The analytical proof showing that output voltage droop characteristics of parallel-connected DC-DC power converters are only appropriate for limited applications is presented. Because power converters are very seldom identical, near-uniform current-sharing without additional control can be achieved only when paralleled power converters have similar characteristics and behave like ideal current sources. This can be achieved at the expense of poor voltage regulation. As an alternative, a current-sharing control technique, which requires no remote sensing, is proposed. This technique ensures uniform or designated current distribution throughout specified load range. A control circuit module is independently implemented without any preliminary knowledge or any circuit modification of the source power converters.<>