A New High-Current Large-Bandwidth DC Active Current Probe for Power Electronics Measurements

Abstract

This paper is focused on the design and the realization of two high current probes (up to 100 A) whose bandwidths range from DC to 50 MHz. These performances have been met by the association of an active Hall sensor and a passive current transformer. This association will be named "active current transformer" (ACT). It will be shown that it has better frequency performances than the classical closed-loop current transducer, usually used for high current measurements but frequency limited. The EMI issues, due to the sensor electrical environment are respected thanks to the shielded structure and special inner arrangements of the Hall sensors. Because of its large bandwidth, its large current ranging and its EMI ruggedness, this current probe is well matched to power electronics measurements.

Using Current Surface Probe to Measure the Current of the Fast Power Semiconductors

“…However, this probe brings an insertion impedance in the measurement power circuit, which may have influence on both switching current and switching voltage waveforms. Otherwise, the HECP maximum measurement current decreases with the frequency increase [14]. According to their technical datasheets, the maximum value generally decreases to a factor of 6 above 10 MHz.…”

A prototype optical fibre direct current sensor for HVDC system

“…In the last few decades, large direct current measurement devices have been widely used in particle accelerators and the electro-winning industry (Appelo et al, 1977;Campostrini and Sonato, 1991;Crisp et al, 2012;Ogawa et al, 2011;Petter et al, 1991;Poulichet et al, 2005;Suzuki et al, 1993Suzuki et al, , 1994Unser, 1981). Among them, zero-flux direct current transducers or Kraemer-type current transducers have been used in high-voltage fields to measure the direct current of HVDC transmission lines.…”

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“…While a few current sensing technologies make use of Ohm's law [1]- [3], many others rely on magnetic field phenomena, including Hall effect [4], [5], Faraday's law of induction [6], [7], and Faraday effect [8], [9].…”

“…These applications require both high frequency AC and DC current measurement [5]. For measuring the AC of a circular conductor, CT and HCT are equipped with a magnetic toroidal core (e.g., silicon steel or ferrite material) for magnetic field concentration.…”

“…current is estimated using (12)-(13) and(3)-(5). The LCD display and the analog amplifier gain are also controlled by the MCU.Each magnetic field sensor measures the magnetic flux density on x and y axes (e.g., GMW 2SA-10G or Melexis MLX91204), therefore totally six ADCs are needed.…”