Measuring Accurately To 10 MHz With Fluxgate Balanced-Core Current Transducers
by Roland Bürger, Morten Birkerod Lillholm and Henrik Elbæk, Danisense, Taastrup, Denmark , How2Power Today, Aug 15 2024
Focus:
For several decades, zero-flux current transducers have been used to extend the measuring
range of power analyzers. Common devices usually have a bandwidth in the three-digit
kilohertz range. However, when using wide-bandgap (SiC and GaN) semiconductor modules,
switching frequencies from 20 to 100 kHz are encountered with harmonics into the megahertz
range and with
active and reactive power components. To measure current accurately in such applications,
bandwidths wider than those of conventional current sensors are required. This 12-page
article presents a zero-flux current transducer developed by Danisense (the DW500UB-2V)
that can provide linear transmission behavior up to 10 MHz. This article discusses the
current sensor’s accuracy requirements for measuring efficiency, the sources of
measurement error (especially error due to phase displacement at higher frequencies), and
how Danisense’s zero-flux balanced-core transducer design overcomes typical bandwidth
limitations.
What you’ll learn:
- How to understand the operation of zero-flux current transducers and the factors affecting their bandwidth and accuracy
- How to understand how Danisense’s zero-flux balanced-core transducer design achieves 10-MHz bandwidth limitations
- How to understand the effect of current sensor error on power analyzer accuracy
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