Determining current sharing criterion for parallel operation of power converters in multi-module bus systems

Abstract

A DC model for a computer backplane power distribution system with multiple sources and loads is proposed. Criteria are derived to determine the allowable range of variation in DC output voltage for a power module operating in a multiple-source, multiple-load system with a backplane interconnect. These criteria impose constraints on output voltage as a consequence of load voltage specifications, and of current-sharing accuracy required of the sources. An algorithm for implementing the solution of these criteria is presented. Computational results for two examples of power distribution systems using this algorithm are presented. The advantage of the system model is that a complete description is provided for a generalized power bus system, which may include ground and power planes of arbitrary geometry. The advantages of the algorithm are that the constraints determined for source voltage are valid under all combinations of load variation and source voltage variation.<>