Input current shaper based on the series connection of a voltage source and a loss-free resistor

Sebastián, J.; Hernando, M.M.; Fernández, Arturo; Villegas, P.; Díaz, Juan José del Coz

doi:10.1109/28.913725

Cited by 43 publications

(42 citation statements)

References 12 publications

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“…The additional winding in the primary side is known as a reset winding in the forward-type converter. The reset winding of the transformer replaces the boost inductor presented in [28]- [31]. Moreover, the proposed converter design reduces the volume and weight of the magnetic material by almost half compared to existing boost-based single-stage PFC converters.…”

Section: Introductionmentioning

confidence: 96%

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Power Factor Improvement With High Efficiency Converters

Babu¹,

Chandrudu²

2012

IOSRJEN

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Abstract-New recommendations and future standards have increased the interest in power factor improvement circuits.There are multiple solutions in which line current is sinusoidal. In addition, in the recent years, a great number of circuits have been proposed with non sinusoidal line current. In the proposed circuit, the power factor is improved by using an auxiliary winding coupled to the transformer of a cascade DC/DC fly back converter. The auxiliary winding is placed between the input rectifier and the low-frequency filter capacitor to serve as a magnetic switch to drive an input inductor. The proposed approach is primarily based on the concept of inductive effect, from which PFC cells composed of energy buffers and high-frequency signals are introduced. Since the DC/DC fly back converter is operated at high-switching frequency, the auxiliary windings produce a high frequency pulsating source such that the input current conduction angle is significantly lengthened and the input current harmonics is reduced. Properly selecting an eligible PFC cell and inserting it in between input rectifier and dc-link capacitor can yield an SSC which can improve the input power factor significantly.

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Section: Introductionmentioning

confidence: 96%

“…The AC/DC converter with non sinusoidal line current employs a simple topology, such as single-stage-single-switch, and costs less in practical applications [28]- [31]. Although the circuits [29]- [31] lack a unity power factor, they comply with IEC 61000-3-2 [26]. A family of such circuits was described in [23] and [24].…”

Section: Introductionmentioning

confidence: 99%

Power Factor Improvement With High Efficiency Converters

Babu¹,

Chandrudu²

2012

IOSRJEN

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“…The minimum conduction angle compatible with compliance with the regulations will be obtained by equalling the value of the more restrictive harmonic (which is a function of the conduction angle, as in the case of any harmonic) to the limit value specified in the regulations. Once the minimum value of qccompatible with compliance with the regulation is known, then the value of LD can be calculated as follows [4,6]: where f, is the switching frequency and K is a coefficient determined by the AICS topology (K=4 for the AICS shown in Fig. 3a).…”

Section: Design Of Active Input Current Shapersmentioning

confidence: 99%

“…3a). As far as achieving compliance with the IEC 1000-3-2 when the equipment has been classified in Class D is concerned, the conditions are very simple: the converter must be designed in such a way that the conduction angle at 230 Vac and at full load is wider than 64.47' (see [4]). This value was obtained in [4] by assuming that the value of the bulk capacitor C, is large enough to allow us to neglect its voltage ripple.…”

Section: Design Of Active Input Current Shapersmentioning

confidence: 99%

“…As far as achieving compliance with the IEC 1000-3-2 when the equipment has been classified in Class D is concerned, the conditions are very simple: the converter must be designed in such a way that the conduction angle at 230 Vac and at full load is wider than 64.47' (see [4]). This value was obtained in [4] by assuming that the value of the bulk capacitor C, is large enough to allow us to neglect its voltage ripple. The theoretical result obtained is very close to the experimental results measured in several prototypes [4-61 (even with different values of the bulk capacitor) and, therefore this easy method can be used to design AICS complying with the IEC 1000-3-2 in Class D. Regarding the conditions to achieve compliance with the IEC 1000-3-2 when the equipment has been classified in Class A, a similar procedure can be followed.…”

Section: Design Of Active Input Current Shapersmentioning

confidence: 99%

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Designing single-stage power factor correctors and LC passive filters to comply with the new version of the IEC 1000-3-2 regulations

Lin

Villarejo

Sebastián

et al.

2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289)

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Abstract-The design of low-cost power supplies is influenced by the regulations on the low-frequency harmonic content in the line. As IEC 1000-3-2 regulations have just been modified, the design procedure of low-cost power supplies should also be modified. According to the new version of the above-mentioned regulations, many power supplies classified as Class D in the past are classified as Class A now. This fact allows a remarkable saving in the sue of the reactive elements used to reduce the line harmonics if they have been properly designed. The minimum values of the magnetic elements used in two well-known PFC solutions (one is an S*PFC and the other is a passive fdter) have been obtained in this paper for equipment classified in both the new Class A and the new Class D and for any power level between 75W and 600W.

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