High-frequency small-signal model of ferrite core inductors

Kazimierczuk, Marian K.; Sancineto, G.; Grandi, Gabriele; Reggiani, Ugo; Massarini, A.

doi:10.1109/20.799066

Cited by 97 publications

(44 citation statements)

References 3 publications

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“…The PWM switching frequency was selected to avoid high energy dissipation into the switching element and the amorphous core [17], and to reduce the emission of electromagnetic radiations (EMRs) which are directly related to the increase in the switching frequency. The PWM switching frequency was therefore chosen with a value of f s = 2 kHz which is close to the lower established theoretical limits [18].…”

Section: Dynamic Modeling Of the Convertermentioning

confidence: 99%

“…The winding resistance in [17] is not increased at / s < 20 kHz and the main inductance is considered to be frequency independent up to 1 MHz. Both limits are quite far from the chosen switching frequency.…”

Section: Control Systemmentioning

confidence: 99%

“…1 illustrates a typical Buck converter with a switch implemented as an N depletion mode MOSFET transistor. The coil L is modeled with an amorphous magnetic core and is represented with two parallel lines [17]. Both the transistor and the diode are considered as ideal components, and their heating is considered only from the point of view of the choice of modulation frequency.…”

Section: Introductionmentioning

confidence: 99%

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Space-state robust control of a Buck converter with amorphous core coil and variable load

et al. 2013

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Pulse-width modulation is widely used to control electronic converters. One of the most frequently used topologies for high DC voltage/low DC voltage conversion is the Buck converter. These converters are described by a second order system with an LC filter between the switching subsystem and the load. The use of a coil with an amorphous magnetic material core rather than an air core permits the design of smaller converters. If high switching frequencies are used to obtain high quality voltage output, then the value of the auto inductance L is reduced over time. Robust controllers are thus needed if the accuracy of the converter response must be preserved under auto inductance and payload variations. This paper presents a robust controller for a Buck converter based on a state space feedback control system combined with an additional virtual space variable which minimizes the effects of the inductance and load variations when a switching frequency that is not too high is applied. The system exhibits a null steady-state average error response for the entire range of parameter variations. Simulation results and a comparison with a standard PID controller are also presented.

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Section: Dynamic Modeling Of the Convertermentioning

confidence: 99%

Section: Control Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Space-state robust control of a Buck converter with amorphous core coil and variable load

et al. 2013

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“…7.1a [42][43][44][45]. The impedance magnitude of a practical inductor as a function of frequency is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Advanced Filters and Components for Power Applications

Neugebauer¹,

Pierquet²,

Perreault³

2006

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The objective of this thesis is to improve the high frequency performance of components and filters by better compensating the parasitic effects of practical components. The main application for this improvement is in design of low pass filters for power electronics, although some other applications will be presented.In switching power supplies the input and output filters must attenuate frequencies related to the fundamental switching frequency of the converter. The filters represent a major contribution to the weight, volume and price of the power supply. Therefore, aspects of the design of the switching power converter, especially those related to the switching frequency, are limited by the high frequency performance of the filters. The usual methods of improving the high frequency performance of the filter includes using larger, better components. Filter performance can improve by using higher quality inductors and capacitors or by adding high frequency capacitors in parallel with the filter capacitor. Also, an additional filter stage can be added. All of these methods add significant cost to the design of the power supply.If the effect of high-frequency parasitic elements in the components can be reduced (at a low cost) the performance of the filter can be enhanced. This allows the development of filters with much better high frequency attenuation, or the reduction of filter size and cost at a constant performance level. In filtering and other applications, the ability to reduce the effect of parasitic elements will be a technique that will enable many high-frequency designs.Specifically, this thesis will present two techniques that can be used to reduce the effects of parasitic inductance and capacitance. One technique, called inductance cancellation, is used to reduce the amount of parasitic inductance in a path of interest. The other technique, capacitance cancellation, will reduce the effect of a parasitic capacitance in an inductor. The techniques introduced here cannot be used to improve performance of passive components in all applications. These techniques, though, do provide major improvements in most filtering applications, an application in which parasitic components play an important role in the design.

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“…where p is the number of winding layers, and is the ratio of winding thickness to skin depth [6]. The resistance and inductance contribution from the core due to eddy currents can be determined by:…”

mentioning

confidence: 99%