Low‐power design for DC current transformer using class‐D compensating amplifier

Veinović, Slavko; Ponjavic, Milan; Milić, Saša; Djuric, Radivoje

doi:10.1049/iet-cds.2017.0324

Cited by 12 publications

(16 citation statements)

References 21 publications

(42 reference statements)

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“…If the internal SWT dissipation, related to I1 and I2, is not large enough, problem occurs, since unidirectional power supply is incapable to absorb negative 1 D I or 2 D I . The problem is similar to well-known effect in theory of audio amplifiers, named as buss pumping effect [15]. In that situation, power bus with negative supply current increases voltage level, increasing in a same time internal consumptions inside of the SWT, in order to dissipate energy returned from the secondary winding.…”

Section: I I mentioning

confidence: 74%

“…could overcame SWT limitations, but in practice their complexity and efficiency are reasonable for much higher powers then powers found in DCTs. Absorption of negative current of power is certainly possible to be solved by more or less complex electronics [15], but in this case the question arises of what is being obtained and what is lost, which is an analysis that goes beyond the scope of this paper. Power consumtion of two transducer types IT and SWT.…”

Section: Discussionmentioning

confidence: 99%

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Optimization Possibilities for DC Current Transformer

Ponjavic¹,

Veinović²,

Ðurić³

et al. 2019

IJEEC

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The paper analyzes the consumption performance of DC current transformers based on linear class B, and half bridge classD compensation amplifiers, as well as self-oscillating flux gate current transformers based on push-pull and source–sink output stages.Compensation amplifiers, push-pull and source-sink output stages are used to generate feedback current in order to compensatemagnetic flux in the magnetic concentrator core, produced by electrical current flowing through a conductor under measurement. Thefocus of the analysis is the investigation of conditions for appearance of the bus-pumping effect to which all switching versions of DCcurrent transformers are prone. All sufficient conditions for bus pumping effect appearance are explained for the most critical case ofDC current measurement; the main issues are analyzed, giving better insight to power consumption, and possible hazards to DCcurrent transformer circuitry. It is highlighted the existence of particular exploitation conditions that lead to the state where the class Dbased DC transformers are inferior to conventional class B based counterparts. Finally, when a linear compensating amplifier isreplaced with a switching counterpart, it has been demonstrated that it is possible to expect a feasible improvement in energyconsumption in the middle of the ideal half-class D class and classical B class realisations.

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Section: I I mentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Optimization Possibilities for DC Current Transformer

Ponjavic¹,

Veinović²,

Ðurić³

et al. 2019

IJEEC

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show abstract

“…As the dependence of the second harmonic component voltage on the DC current is non-linear, fluxgate current sensors usually work in the feedback loop compensating the measured DC current to zero. These sensors are also called DC current transformers [72], [73], [74]. We have shown that this mechanism can be used on a standard current transformer by injecting the excitation current into the secondary winding [75].…”

Section: Fig 3 Rogowski Coil Integrated Into the Laminated Busbar -Amentioning

confidence: 99%

Contactless measurement of electric current using magnetic sensors

Ripka

2019

Tm - Technisches Messen

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We review recent advances in magnetic sensors for DC/AC current transducers, especially novel AMR sensors and integrated fluxgates, and we make critical comparison of their properties. Most contactless electric current transducers use magnetic cores to concentrate the flux generated by the measured current and to shield the sensor against external magnetic fields. In order to achieve this, the magnetic core should be massive. We present coreless current transducers which are lightweight, linear and free of hysteresis and remanence. We also show how to suppress their weak point: crosstalk from external currents and magnetic fields.

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“…For DC current measurement, current transformer based on diverter principle and zero flux DC current transformer are widely used [10]- [12]. Although these transformers feature high measurement accuracy, its large volume and heavy weight restrict their practical field applications on site.…”

Section: Introductionmentioning

confidence: 99%

Research on a Composite Voltage and Current Measurement Device for HVDC Networks

Jiang

Abu-Siada

et al. 2021

IEEE Trans. Ind. Electron.

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With the global trend to develop digital substation automation systems, measurement devices are required to be reliable, of small size and light weight and of acceptable accuracy in a wide frequency band. This paper presents a combined high voltage direct current (HVDC) measurement method which comprises the abovementioned features that makes it suitable for smart grids protection and control applications. The proposed measurement method utilizes Hall sensor array for DC current measurement. DC voltage is measured using a voltage divider circuit while the harmonic currents are measured using a square Rogowski coil made of four straight bars along with a high precision digital integration algorithm. A four-spectral line interpolation fast Fourier transform algorithm based on trapezoidal convolution window is proposed to improve the extraction accuracy of the DC and harmonic components from the measured signal. Experimental results show that the error variation of the proposed method is less than 0.098% for voltage measurement while it is less than 0.104% for current measurement. The harmonic measurement ratio error is less than 0.2% and the angle error is less than 8'.

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Low‐power design for DC current transformer using class‐D compensating amplifier

Cited by 12 publications

References 21 publications

Optimization Possibilities for DC Current Transformer

Optimization Possibilities for DC Current Transformer

Contactless measurement of electric current using magnetic sensors

Research on a Composite Voltage and Current Measurement Device for HVDC Networks

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