Wide bandwidth, large AC current probe for power electronics and EMI measurements

Costa, François; Labouré, Éric; Forest, F.; Gautier, Cyrille

doi:10.1109/41.605626

Cited by 46 publications

(27 citation statements)

References 8 publications

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“…The current measurement is carried out using a 1 O/2 GHz TMS Research non-inductive shunt [15]. Two voltage probes Tektronix P6139A are connected differentially to measure the diode voltage.…”

Section: Experimental Methodsmentioning

confidence: 99%

A novel approach to extract accurate design parameters of PiN diode

Salah¹,

Ghedira²,

Garrab³

et al. 2007

Int J Numerical Modelling

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SUMMARYAccurate modelling of PiN diode transient behaviour is necessary to extract design parameters which are not documented in datasheets. To meet this requirement, this paper introduces a novel approach giving the possibility to identify accurate parameters of a given device. The used technique is based only on two stages. First, the design parameters are initialized and optimized. Second, they are refined by minimizing the cost function which depends on the transient switching parameters (I RM , V RM and t rr ).With a simple and CPU time-saving approach this technique leads to extract design parameters without necessarily knowing the exact technological architecture of the PiN diode. Moreover, in order to validate the proposed approach and the parameter extraction procedure three commercial diodes are tested. A good agreement between experimental and simulation data is obtained.

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Section: Experimental Methodsmentioning

confidence: 99%

A novel approach to extract accurate design parameters of PiN diode

Salah¹,

Ghedira²,

Garrab³

et al. 2007

Int J Numerical Modelling

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show abstract

“…However, the expression in (3) is only valid as long as a good coupling between primary and secondary can be ensured, which is not the case at low frequencies [4]. As a consequence, current transformers feature a high-pass characteristic and are therefore not suitable for measurement of DC and/ or low frequency signals.…”

Section: ) Current Transformermentioning

confidence: 98%

Concept and experimental evaluation of a novel DC- 100MHz wireless oscilloscope

Lobsiger

Ortiz

Bortis

et al. 2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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A wireless oscilloscope featuring 100 MHz analog bandwidth and ultra-high isolated measurement channels is presented in this paper. In order to visualize the benefits of this potential-free measurement system, the paper starts with a revision of commonly utilized isolated voltage and current measurement concepts. With a clear understanding of the benefits given by a high-bandwidth, high-isolated and highly common mode immune measurement system laid down, the details about the wireless oscilloscope and its potential-free input channels are presented. Experimental measurements comparing the state of the art isolated voltage and current measurement concepts with the proposed wireless oscilloscope regarding common mode rejection ratio and signal-to-noise ratio are presented, showing the excellent performance of the introduced measurement system.

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“…3 a) the resulting spectrum of the flux B(t), with an upper cutoff frequency of WLF, is shown. Based on (1) and the given spectrum of the flux B(t), the spectrum of the flux sensor's output signal vs(t) can be calculated as AM Modulated Excitation (2) and is illustrated in Fig. 3 b).…”

Section: B Ac Excitationmentioning

confidence: 99%

“…Rogowski Coil [I] AC Current Transfonner [2] Magnetoresistive [3] Magneto-Optical [4] Hall Effect [6] Saturable Inductor [5] Magnetostriction Proposed Concept Piezo Disc Open Loop [8] …”

Section: Isolatedmentioning

confidence: 99%

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Novel principle for flux sensing in the application of a DC + AC current sensor

Mauerer

Schrittwieser

Ortiz

et al. 2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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Magnetostriction describes the geometrical change in length of a ferromagnetic material in dependence of its internal magnetic flux density value. By detecting the vibrations caused by these dimensional changes with a piezo-electric transducer, the instantaneous value of the magnetic flux inside a magnetic core can be sensed from DC up to a few kilohertz. This principle, together with a high bandwidth current transformer, was utilized in order to construct a current sensor capable of measuring currents ranging from DC to several MHz. As will be shown in this paper, an additional sinusoidal AC-excitation of the core material provides higher sensitivity of the length measurement and overcomes the high-pass characteristic of the piezo sensor. In order to prove the principle and to demonstrate the capabilities of this new sensor, a series of experimental measurements and implementation results are presented. I. INTRODU CTIONPrecise current measurement is a mandatory requirement of modern power electronic systems as it enables the im plementation of high performance current control loops, monitoring and safe shut-down in case the maximum allowed current value has been exceeded, among others.Depending on the specific application and the required performance of the measurement system, the existing current measurement concepts can be classified according to their key operating principles. Fig. 1 gives an overview of the most common current measurement methods that are applicable in power electronics whereby their key features are presented in the following. A. Isolated Current Measurement ConceptsIf a galvanic isolation between the current to be mea sured and the sensor is required, the measurement principle is typically based on Ampere's Law where effects caused by the magnetic field of the current are exploited. There, Rogowski coils or AC current transformers are commonly used when only AC currents need to be measured, e.g. in power transmission systems [1] [2]. On the other hand, if AC as well as DC current compo nents need to be captured, several techniques are applicable. Magneto-resistive sensors make use of the fact that some ma terials change their resistance in the presence of a magnetic field [3]. Magneto-optical current sensors exploit the Faraday Effect and are usually applied in high-current applications [4]. There are many methods involving a saturable magnetic material in order to measure current. Sensors of this kind can be operated in open or closed loop systems and usually require more than one magnetic core [5]. Current can also be measured by introducing a semiconductor Hall-effect sensor in the magnetic path in order to directly measure the magnetic field caused by the current. These current sensors can be operated in open or closed loop configurations as well and they can be combined with a current transformer to achieve a higher bandwidth [6]. B. Non-isolated Current Measurement ConceptsIf no galvanic isolation is required, the current can be measured by using Ohm's Law and a shunt resistor [6].In...

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Wide bandwidth, large AC current probe for power electronics and EMI measurements

Cited by 46 publications

References 8 publications

A novel approach to extract accurate design parameters of PiN diode

A novel approach to extract accurate design parameters of PiN diode

Concept and experimental evaluation of a novel DC- 100MHz wireless oscilloscope

Novel principle for flux sensing in the application of a DC + AC current sensor

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