Development of current measurement techniques for high frequency power converters

Current sensing plays dominant role in power converters, where current information can be used for controlling, monitoring and protection. One of the most challenging goals in modern power electronics converters is to increase switching frequency for the purpose of miniaturization, and improve the performance especially for end-users. Therefore, the need for accurate, lossless, and fast response current sensors is more highlighted. This paper presents a comprehensive review of different current sensing schemes for power electronics applications. The Challenges for implementation of conventional methods for high frequency (>1MHz) and high current converters will be addressed. More specifically, technical issue and hardware difficulties for developing Rogowski-based as well as Hall effect current sensors are discussed and finally, a new technique for improving the performance of Anisotropic Magneto-Resistive (AMR) at 1MHz and 30V with a new technique is shown.