A first evaluation on the usage of threshold triggered magnetic field sensors for current polarity detection in power conversion systems
A first evaluation on the usage of threshold triggered magnetic field sensors for current polarity detection in power conversion systems
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关于在功率转换系统中使用阈值触发磁场传感器进行电流极性检测的首次评估
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
W. Hofmann
中科院分区：
文献类型：
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作者：
S. Krauss;W. Hofmann
由于功率变换系统中功率开关的开关时间有限，死区效应已被研究了很长一段时间。在过去几年中，已经提出了多种消除或减少死区效应的技术。除了减少半导体开关次数外，其主要思想是用平均死区误差电压来补偿死区效应。一种更可行的方法是基于相电流极性的知识，而只有那些半导体是有源开关的，它们能够在实际方向上传导电流。由此产生的换向策略，已经被称为一步换向，是适合于电压源型变换器以及矩阵变换器。除了基于霍尔效应的传统电流传感器之外，还描述和测试了用于相电流极性确定的替代技术，例如根据所用半导体的正向电流-电压特性进行调整的电流检测。本文重点介绍了阈值触发磁场传感器的潜力。作为离散位置和速度测量的传感器，脉冲线传感器似乎适合作为相电流符号的信息源。接下来的传感器参数的统计调查，解决方案的建议，关于两个基本问题，这伴随着该传感器的操作，给出并验证了实验结果。
Dead-time effects as consequence of the finite switching time of the power switches in power conversion systems have been investigated over a long period. Multiple techniques to eliminate or reduce the dead-time effect have been proposed over the last years. Beside the reduction of the semiconductor switching times, the main idea is to compensate the dead-time effect with the averaged dead-time error-voltage. A more feasible method is based on the knowledge of the phase current polarity, whereas only those semiconductors are active switched, which are able to conduct the current in the actual direction. The resulting commutation strategy, already known as one-step commutation, is suitable for voltage source converters as well as for matrix converters. Beside conventional current sensors, based on the hall-effect, alternative techniques for phase current polarity determination, like the current detection adapted from the forward current-voltage characteristic of the used semiconductors, were described and tested. This paper focusses the potential of threshold triggered magnetic field sensors. Already known as sensor for discrete position and velocity measurement, the pulse wire sensor seems to be suitable as information source for phase current sign. Next to a statistical investigation of the sensor parameter, a proposal for solution, concerning the two basic problems, which accompany the operation of this sensor, is given and verified with experimental results.