A DC current transformer for large bandwidth and high common-mode rejection

Ghislanzoni, L.; Carrasco, J.A.

doi:10.1109/41.767072

Cited by 18 publications

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“…Unfortunately, these concepts have a very limited upper bandwidth. Several other core flux cancellation techniques were reported in the literature [23], [24]; however, they show limited upper bandwidth and higher complexity. Pulse currents, as they occur in the switch or in the diode of a dc/dc converter, can be measured using a CT [25], if the CT is demagnetized periodically between the current pulses.…”

mentioning

confidence: 99%

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

Hartmann

Biela

Ertl

et al. 2009

IEEE Trans. Power Electron.

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In many applications, a current measurement that can measure ac currents with dc offset is required. This is not possible using conventional current transformers (CTs) due to the core saturation because of the dc offset. In this paper, a new sensor concept is presented, which consists of a wideband CT and a demagnetizing circuit. The sensor concept is capable of measuring ac currents with dc offset, which have periodic zero crossings, as given in power-factor-corrected (PFC) circuits. Using the demagnetization circuit, the core is actively reset during the zero crossing intervals. The operation principle and design equations are discussed in detail in this paper. For validating the presented concept, three sensors have been built using different core materials, and measurements of the transfer functions as well as operation in a PFC system are presented. A bandwidth from dc up to 20 MHz has been achieved.

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confidence: 99%

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

Hartmann

Biela

Ertl

et al. 2009

IEEE Trans. Power Electron.

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“…Current transformers, together with voltage transformers (VT) (potential transformers (PT)), are known as instrument transformers. When the current in a circuit is too high for direct application to measuring instruments, a current transformer produces a reduced current accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments [1][2][3][4][5].…”

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confidence: 99%

Electromotive Force Characteristics of Current Transformer According to the Magnetic Properties of Ferromagnetic Core

Kim¹

2015

Transactions on Electrical and Electronic Materials

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The most common structure of the current transformer (CT) consists of a length of wire wrapped many times around a silicon steel ring passed over the circuit being measured. Therefore, the primary circuit of CT consists of a single turn of the conductor, with a secondary circuit of many tens or hundreds of turns. The primary winding may be a permanent part of the current transformer, with a heavy copper bar to carry the current through the magnetic core. However, when the large current flows into a wire, it is difficult to measure its magnitude of current because the core is saturated and the core shows magnetic nonlinear characteristics. Therefore, we proposed a newly designed CT which has an air gap in the core to decrease the generated magnetic flux. Adding the air gap in the magnetic path increases the total magnetic reluctance against the same magnetic motive force (MMF). Using a ferrite core instead of steel also causes the generation of low magnetic flux. These features can protect the magnetic saturation of the CT core compared with the steel core. This technique can help the design of the CT to obtain a special shape and size.

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Hochdynamische Stromerfassung in der Leistungselektronik

Hofer-Noser

Karrer

Leistungselektronische Bauelemente

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A DC current transformer for large bandwidth and high common-mode rejection

Cited by 18 publications

References 0 publications

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

Electromotive Force Characteristics of Current Transformer According to the Magnetic Properties of Ferromagnetic Core

Hochdynamische Stromerfassung in der Leistungselektronik

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