Discontinuous conduction/current mode analysis of dual interleaved buck and boost converters with interphase transformer

Wu, Ding; Calderon-Lopez, Gerardo; Forsyth, A.J.

doi:10.1049/iet-pel.2014.0924

Cited by 15 publications

(9 citation statements)

References 27 publications

(41 reference statements)

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“…μ o and μ r are the magnetic permeabilities of air and the core material, respectively. The core and air-gap reluctances are calculated as < core = < t + < s + 2< c (13) < gap = < gc + 1 2 < gs (14) Simplifying (13) and (14), using < gc = 0.5< gs and < c = 0.5< s , the total reluctance is calculated as…”

Section: Boost Inductance Calculationmentioning

confidence: 99%

“…The high-frequency circulating current is due to turning on the top switch of one converter and bottom switch of the second converter, which belong to the same phase group, at the same time. This circulating current is limited by the help of inter-phase transformer or coupled inductor [13]. The low-frequency component is due to output voltage mismatch between the converters.…”

Section: Introductionmentioning

confidence: 99%

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Integrated common‐mode inductor design for parallel interleaved converters

Hedayati

2016

IET Power Electronics

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Paralleling power converters can increase the power rating and reliability of the overall system. Interleaving the carrier in parallel converters helps in reduction of output current distortion, and in reduction of electromagnetic interference noise. This study presents a common-mode inductor design for parallel interleaved converters, which integrates the inter-phase and boost inductors together in a novel structure. It is shown that the proposed magnetic structure accommodates a wider range of desirable electromagnetic parameters. Step-by-step design procedure of the proposed integrated common-mode inductor (ICMI) is presented. The proposed ICMI design results in fewer components, reduces the size and the cost of overall system. The proposed ICMI is compared with a design available in literature using an example. Existing design procedure imposes constraints on the core geometry that are not suitable for high-power designs. The proposed design makes use of standard C cores that improves manufacturability. Experimental results from a 7.5 kVA parallel single-phase power converter show the effectiveness of the proposed ICMI.

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Section: Boost Inductance Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated common‐mode inductor design for parallel interleaved converters

Hedayati

2016

IET Power Electronics

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“…Today ac-dc converters are widely used in many applications, ranging from power supplies for domestic apparatus to wind energy conversion systems [1][2][3][4][5]. The dc voltage is easily provided from ac voltage by using diode or thyristor rectifier; however, this approach leads to injection of significant current harmonics into the ac power supply, and suffers from low power factor.…”

Section: Introductionmentioning

confidence: 99%

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

Alsokhiry

Abdelsalam

Adam

et al. 2019

Electric Power Systems Research

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This paper proposes three topologies of single-stage three-phase ac-dc buck-boost converters suitable for medium-voltage and high-power wind energy conversion systems (WECS). The proposed converters draw sinusoidal input currents with nearly unity power factor from wind generators over wide range of ac voltages and frequencies. The proposed converters reduce the voltage and current stresses on the self-commutated switching device compared to existing solutions; thus, promising for new generation of relatively cheap WECSs. The proposed converters operate in Discontinuous Condition Mode (DCM), with their ac terminals connected to three-phase generator with open ended windings, or to ac supply using three single-phase transformers with isolated windings at converter side. The validity of the proposed converters and its detailed theoretical analysis and discussions are confirmed using PSCAD/EMTDC simulations, and further corroborated by experimentations, considering different operating conditions. Nomenclature δ: Duty cycle. δc: Critical duty cycle ωg: Generator speed ωopt: Optimal speed CCM: Continuous conduction mode DCM: Dissentious conduction modes DBD1 to DBD3 : Sub-converter blocking diodes DFW1 to DFW3 : Sub-converter freewheeling diodes fs : Switching frequency f : Supply fundamental frequency Ic : dc-link capacitor current Ic_avr : Average dc-side capacitor current Ip : Peak fundamental supply current I * p : Reference peak fundamental supply current Ldc1 to Ldc3 : dc-link inductances Ldc_slc :Selected dc-link inductance for given circuit operation ILa, ILb , and ILc : dc-link inductance current ILmax_a, ILmax_b, and ILmax_c : Peak dc inductor currents is1 to is6 : Currents in the switches of the sub-converters ira ,irb ,and irc : Fundamental component of the pre-filter input current ir_rms : Pre-filter input root mean square current MPPT :Maximum power point tracking PI : Proportional integral R : Load resistance txa, txb and txc Deplete times of the energy stored in the dc-link inductors Ts : Switching period Vdc : dc link voltage Vm : Peak of phase voltage vs(a),vs(b), and vs(c) : Three-phase supply voltages WECS : Wind energy conversion system ZCS : Zero current switching

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“…The DC-DC converter is required to maintain constantly high power conversion efficiency with all the three modes of buck, boost, and buck-boost. The common structure for the buck-boost converter is the interleaved technique [9][10][11], where a number of converter sets are integrated into one. The benefit of the interleaved technique is to release the stress on the switch devices, and to obtain a high-power density converter.…”

Section: Introductionmentioning

confidence: 99%

A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications

Nga

Park

et al. 2018

Energies

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This paper presents a wide range buck-boost direct current to direct current (DC-DC) converter for wireless power transfer (WPT) systems. To implement the wide range DC-DC converter, a Hysteresis triple-mode selector is proposed and designed to effectively adjust the DC-DC converter to operate in one of the three modes: buck, boost or buck-boost, according to the input voltage level. Hysteresis control technique eliminates the unstable state at the mode transition. An output soft start-up circuit is proposed to reduce the inrush current in the switch transistor. A min-max duty generator is introduced to improve the accuracy of DC-DC converter. When the output voltage is too low or too high in comparison to the desired value. The min-max duty generator can control the DC component of the error signal to eliminate the unwanted dead state of the pulse width modulation signal. In addition, only one external inductor is shared between two power stages, thus minimizing the system cost by reducing the external components. The proposed buck-boost DC-DC converter is implemented using 180 nm Complementary Metal-Oxide-Semiconductor (CMOS) technology. The output voltage is regulated to 5 V when the input voltage ranges 3-8 V, and output load current ranges 100-500 mA. The die area is 1.55 mm × 1.14 mm (1.767 mm 2). The measured peak efficiency of the buck-boost DC-DC converter is 94.8%.

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Discontinuous conduction/current mode analysis of dual interleaved buck and boost converters with interphase transformer

Cited by 15 publications

References 27 publications

Integrated common‐mode inductor design for parallel interleaved converters

Integrated common‐mode inductor design for parallel interleaved converters

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications

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