Implementation of a parallel zero-voltage switching forward converter with less power switches

Lin, Bor‐Ren; Shih, Huei-Yuan

doi:10.1049/iet-pel.2009.0258

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…In this paper, for simplicity, parallel pulse width modulation with an AC-side isolation transformer [26,27], as shown in Figure 3, is used to eliminate the circulating current that would otherwise arise from the parallel operation of the main and auxiliary grid-side converters.…”

Section: Auxiliary Gsc Controlmentioning

confidence: 99%

Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter

Dou

Chu

et al. 2013

Energies

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Abstract:In this paper, based on the similarity, in structure and principle, between a grid-connected converter for a direct-driven permanent magnet synchronous generator (D-PMSG) and an active power filter (APF), a new D-PMSG-based wind turbine (WT) system configuration that includes not only an auxiliary converter in parallel with the grid-side converter, but also a coordinated control strategy, is proposed to enhance the low voltage ride through (LVRT) capability and improve power quality. During normal operation, the main grid-side converter maintains the DC-link voltage constant, whereas the auxiliary grid-side converter functions as an APF with harmonic suppression and reactive power compensation to improve the power quality. During grid faults, a hierarchical coordinated control scheme for the generator-side converter, main grid-side converter and auxiliary grid-side converter, depending on the grid voltage sags, is presented to enhance the LVRT capability of the direct-driven PMSG WT. The feasibility and the effectiveness of the proposed system's topology and hierarchical coordinated control strategy were verified using MATLAB/Simulink simulations.

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Section: Auxiliary Gsc Controlmentioning

confidence: 99%

Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter

Dou

Chu

et al. 2013

Energies

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“…Single-ended forward converter is a common and popular power converter topology. It is widely used in consuming power supplies at 100-300 W power range because of its simple structure and less power electronic components, and its large current output capability and multiple outputs [1]. By analyzing the linear small signal transfer function, singularities can be avoided on the right side of the coordinate axis, which simplify the control method and ensure stable operation of the system [2].…”

Section: Introductionmentioning

confidence: 99%

Closed-Loop Gate Drive for Single-Ended Forward Converter to Reduce Conducted EMI

et al. 2020

IEEE Access

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Forward DC / DC converters are widely used in low and medium power circuits that are widely used in the aerospace and navigation fields. Power converters are usually sources of electromagnetic interference (EMI), which is due to their higher voltage and current transients. The traditional method is to add expensive filters on the primary side or the secondary side, but its disadvantages are high cost and poor adjustability. Based on the principle that the greater the number of derivations of voltage transients, the lower the high frequency electromagnetic interference contained in this voltage, a signal containing small high-frequency noise that is suitable for the hardware circuit as a reference signal is selected, and a closedloop gate drive method is used in this paper, which attenuate the conducted EMI noise in the input bus of the forward DC/DC converter. The reference signal shapes the output signal to achieve the purpose of suppressing electromagnetic interference through the closed loop circuit. The advantages of this method are making the output highly adjustable, reducing hardware size and weight and lower cost compared with filter method. Compared with the method of controlling current to reduce electromagnetic interference, the proposed method is easier to implement. Firstly, the relationship between the derivative order of voltage transient and electromagnetic interference is introduced. Secondly, the experimental principle of singleended forward circuit controlled by closed loop is introduced. Simulation and experimental results show that the proposed method can achieve voltage shaping and suppression of voltage overshoot effectively. Compared with the traditional hard-switching control method, the proposed method can make the highfrequency components of the drain-source voltage of the primary-side MOS transistor and the secondaryside output voltage have a greater attenuation.

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“…Furthermore, the output filter of the converter results in the low output voltage ripples. Similar to other switching converters, high d v /d t and d i /d t generate electromagnetic emissions in the forward converter [2]. The forward converter has a pulsating input current due to the nature of the buck topology.…”

Section: Introductionmentioning

confidence: 99%

“…The forward converter has a pulsating input current due to the nature of the buck topology. In addition, some parasitic elements such as leakage inductances and stray capacitances increase the d v /d t and d i /d t , especially at turn‐off instant [2] and this leads to electromagnetic interference (EMI). Generated electromagnetic emissions can disturb the operation of nearby electrical and electronic systems.…”

Section: Introductionmentioning

confidence: 99%

Conducted electromagnetic interference evaluation of forward converter with symmetric topology and passive filter

Yazdani¹,

Filabadi²,

Faiz

2014

IET Power Electronics

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Forward converter is popular for isolated switching power supply. Generally, power switching converters are the sources of electromagnetic interference (EMI) because of their high transient voltage and current. In this study, reduction of conducted EMI in the single-switch forward converter is examined using a symmetric topology. At this end, the forward converter topology is modified to achieve a symmetric topology. EMI model of the conventional forward converter and symmetric forward converter are derived taking into account the main parasitic of components and printed circuit tracks. Accuracy of the predicted EMI is verified by the measured EMI for two converters. In addition to the symmetric approach evaluation from the EMI viewpoint, the effect of this approach on the output voltage noise is examined. Finally, the combination of a passive EMI filtering with the symmetric method is utilised for EMC compliance.

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Implementation of a parallel zero-voltage switching forward converter with less power switches

Cited by 12 publications

References 12 publications

Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter

Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter

Closed-Loop Gate Drive for Single-Ended Forward Converter to Reduce Conducted EMI

Conducted electromagnetic interference evaluation of forward converter with symmetric topology and passive filter

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