A current-sharing interface circuit with new current-sharing technique

• Published in: IEEE transactions on power electronics Vol. 20; no. 1; pp. 35 - 43
• Main Authors: Cheng, D.K.-W., Yim-Shu Lee, Yi Chen
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2005; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Circuits; Current measurement; Current-sharing (CS) interface circuit; Electric currents; Electrical engineering; Electrical engineering. Electrical power engineering; Exact sciences and technology; Fault tolerant systems; Inductors; Integrated circuit interconnections; Multichip modules; parallel power modules (PPMs); Power electronics, power supplies; Power measurement; Power supplies; Power system interconnection; Voltage control; Voltage measurement; Power circuit; Voltage fall; Connection; Power system stability; Output circuit; Power supply; Power electronics; Interface circuit; Experimental study; parallel power modules (PPMs); Inductor; Voltage control; Implementation; Fault currents; Hysteresis loop; Current-sharing (CS) interface circuit; Parallel connection; Voltage stability; Current distribution; Fault tolerant system; Electric fault
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2004.839875

This paper proposes a current-sharing (CS) circuit for parallel power modules. The interface circuit enables the outputs of independent and nonidentical power modules to equally share the load current in a fault-tolerant oring-connection power supply system. No CS interconnections among the power modules are required. In the proposed interface circuit, the output currents of the parallel power modules are sensed by measuring the inductor voltage drops and controlled in a hysteresis manner. A practical CS interface circuit is implemented. The experimental results are in good agreement with the theoretical analyses.