Performance evaluation of a simplified multi-function current transformer for high frequency power converters

Abstract

A multi-function current transformer introduced some years ago is revisited in an effort to improve its manufacturability. The original current sensor has the ability to accurately represent load and phase-arm currents in single phase full-bridge dc-dc-converter topologies under normal operating conditions. In the event of a phase-arm fault the shoot-through current can also be detected and the information used in the protection scheme. This sensor is however very complex to manufacture and this work presents a simplified version of the sensor, which still gives the most important information with a far less complex structure. This paper briefly discusses the original current sensor, proposes a simplified sensor and evaluates the new sensor in terms of performance.