Dead-Time for Zero-Voltage-Switching in Battery Chargers with the Phase-Shifted Full-Bridge Topology: Comprehensive Theoretical Analysis and Experimental Verification

Zhang, Taizhi; Fu, Junyu; Qian, Qinsong; Sun, Weifeng; Lu, Shengli

doi:10.6113/jpe.2016.16.2.425

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…In the half-bridge converter, asymmetric control is required to use the zero-voltage switching (ZVS) method, and causes unbalanced voltage and current stress of the switches. Contrary to other insulated converters, in the full-bridge converter, the ZVS method can be used without asymmetric control thus its control method can be simplified [11]. Therefore, in general, the full-bridge converter is used for the LDC.…”

Section: Introductionmentioning

confidence: 99%

Control Method for Phase-Shift Full-Bridge Center-Tapped Converters Using a Hybrid Fuzzy Sliding Mode Controller

2019

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This paper presents a control method for phase-shift full-bridge center-tapped (PSFB-CT) converters using hybrid fuzzy sliding mode controllers (SMCs). Conventionally, the output voltage of a PSFB-CT converter is controlled by using a proportional-integral (PI) controller. However, the dynamic characteristic of the converter is undesirable, and the converter is not robust to disturbances. In order to overcome these disadvantages, the SMC based on PI control has been applied for the PSFB-CT converter. However, there is a chattering problem when the SMC gain is increased to improve the dynamic characteristic. In this paper, a control method for the PSFB-CT converter using fuzzy logic control is proposed. By varying the gain of the SMC through the fuzzy logic control, not only can the dynamic characteristic of the PSFB-CT converter be improved, but the chattering problem can also be relieved. The effectiveness of the proposed control method for the PSFB-CT converter was verified by the simulation and experimental results.

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Section: Introductionmentioning

confidence: 99%

Control Method for Phase-Shift Full-Bridge Center-Tapped Converters Using a Hybrid Fuzzy Sliding Mode Controller

2019

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“…Descriptions of state equation are given because the characteristics of MOSFET in the process of turning-on and turning-off are combined. In [16], the influence of load current on miller platform of MOSFET is considered in the equivalent model. Furthermore, the dead time of two bridges can be effectively adjusted.…”

Section: Introductionmentioning

confidence: 99%

An improved power loss model of full-bridge converter under light load condition

Yao

Liu

2018

PLoS ONE

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When the full-bridge converter works under the light load condition, the power efficiency obtained by the theoretical model is much different from that of the actual converter. Facing with this situation, an improved power loss model based on the typical power loss model is proposed. In this paper, the typical power loss model is called typical model for short and the improved power loss model is called proposed model for short. Firstly, the antiparallel freewheeling diodes at the arms of full-bridge circuit are taken into account. Every barrier junction capacitance of Schottky diode in the rectifier circuit is neglected. Then, the turning-off loss of full-bridge and the core loss of inductive components (the transformer and the filter inductor) in the typical model are compensated and modified by combining the theoretical values with the measured input current under the minimum and the maximum output current. In addition, it also corrects the equivalent resistance related to the conduction loss of converter. Eventually, the proposed model is established. The rise time and fall time of the midpoint voltage of two arms, and the fluctuation degree of the reverse bias voltage related to the Schottky rectifier diodes are regarded as the local indexes. The conduction time of the metal oxide semiconductor field effect transistor (MOSFET) in each switching period, and the power efficiency of converter are regarded as the global indexes. Based on the analyses, the local indexes are compared qualitatively, while the global indexes are compared quantitatively. It is found that the differences of the local indexes between the proposed model and the experiment are smaller than those between the typical model and the experiment. Meanwhile, the global indexes of the proposed model are closer to the experimental results. Therefore, it can be further demonstrated that the proposed model is more approximate to the actual converter than the typical model.

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“…Besides, the higher I minZV S , the higher turn-off losses, although E OF F are much lower than E ON in WBG semiconductors (Table 2.3), and also more CM EMI is generated [68]. However, it can be noticed that to set the most optimal I minZV S , t DB should change for any d to exactly match Once I minZV S is calculated, the time needed to charge/discharge the parasitic capacitance can be deduced by analyzing the equivalent circuit [136]. Referring to the transition depicted in Figure 4.30, which corresponds to the angle α 1 while T 14 is on (see Figure 4.27(b)), the left full-bridge current path just after turn-off can be depicted as in Figure 4.…”

Section: Determination Of Minimum I Minzv S By Parasitic Capacitancementioning

confidence: 99%

Design optimization of dual active bridge converter

Capó Lliteras

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(English) The proliferation of batteries for local storage and electric vehicles (EVs) is rising steadily. The EV market’s prospects point to exponential growth in the coming years. This trend has also contributed to the promotion of local storage using second-life batteries. The emerging electrical landscape aims for an environmentally friendly energy system. However, this new paradigm brings along various technological challenges. Electronic power converters are crucial in managing battery energy in both charging and discharging directions, offering grid flexibility services. Compliance with international safety standards mandates galvanic isolation, particularly in high-power systems. Furthermore, power density is significant in the automotive industry, where space and weight constraints are significant factors. The same holds for dwellings, where land value continues to escalate, especially in urban areas. In this context, the Dual Active Bridge (DAB) converter emerges as a highly suitable power electronics-based component that fulfills all the mentioned requirements. This Isolated Bidirectional DC-DC converter (IBDC) is appealing due to its impressive power density, galvanic isolation, and bidirectional power flow capability. Firstly, this thesis explores the potential of IBDC and addresses a state of-the-art. The next step focuses on the DAB converter, establishing the unification of criteria for the different DAB modulations and obtaining generalized equations for any DAB converter. Moreover, the different parasitic elements of the DAB converter are extensively analyzed. On the one hand, this thesis presents a Triangular Current Modulation with Zero Current Switching (TCM-ZCS). The analysis highlights that six of eight semiconductors operate under ZCS conditions, concentrating turn-off switching losses in the same leg regardless of the power flow direction. This finding suggests the potential for utilizing more cost-effective semiconductor technologies for those operating under ZCS conditions. As a result, a hybrid Si-SiC DAB configuration is considered the preferred hardware option to take advantage of this proposal. On the other hand, the work proposes two DAB modulations that consider all three degrees of freedom to optimize conduction losses and turn-off losses across the entire load and voltage rate range. The optimization algorithms and equations are presented and normalized for clarity, with nomograms as graphical representations. One key contribution of this thesis is the development of equations for implementing minimum conduction loss modulation while guaranteeing Zero Voltage Switching (ZVS) constraints and maintaining stability. The proposed approximation offers precise optimal solutions across the entire operating range, allowing real-time evaluation with low execution time and ensuring a fast dynamic response for any DAB converter. Finally, the last chapter focuses on the positive impact of the transformer’s magnetization inductance on extending the ZVS operation region of the DAB converter. The focus is on understanding the consequences of this extension, particularly in terms of increasing the Root Mean Square (RMS) current and conduction losses. The chapter provides a manageable analytical approximation for real-time modulation implementation. (Català) La proliferació de bateries per emmagatzematge local i vehicles elèctrics (EVs) està augmentant constantment. Les perspectives del mercat d’EV preveuen un creixement exponencial en els propers anys. Aquesta tendència també ha contribuït a la promoció de l’emmagatzematge local utilitzant bateries de segona vida. El nou panorama elèctric té com a objectiu un sistema energètic respectuós amb el medi ambient. No obstant això, aquest nou paradigma comporta diferents reptes tecnològics. Els convertidors electrònics de potència són crucials en la gestió de l’energia de les bateries en ambdues direccions de càrrega i descàrrega, oferint serveis de flexibilitat a la xarxa. El compliment de les normes de seguretat internacionals implica l’aïllament galvànic, especialment en sistemes d’alta potència. A més, la densitat de potència és significativa a la indústria automobilística, on les restriccions d’espai i pes són factors importants. El mateix s’aplica a les llars, on el valor del terreny continua augmentant, especialment en àrees urbanes. En aquest context, el convertidor de pont dual actiu (DAB) emergeix com un component basat en electrònica de potència altament adequat que compleix amb tots els requisits esmentats. Aquest convertidor bidireccional aïllat CC-CC (IBDC) és atractiu per la seva alta densitat de potència, aïllament galvànic i capacitat de flux de potència bidireccional. En primer lloc, la tesi explora el potencial dels convertidors IBDC i n’aborda l’estat de l’art. A partir d’aquest punt, la tesi es centra en el convertidor DAB, establint la unificació de criteris per a les diferents modulacions de DAB i obtenint equacions generalitzades per a qualsevol convertidor DAB. A més, s’analitzen extensament els diferents elements parasitaris del convertidor DAB. Respecte les estratègies de control, d’una banda, aquesta tesi presenta una modulació de corrent triangular amb commutació en zero corrent (TCM-ZCS). L’anàlisi destaca que sis dels vuit semiconductors funcionen en condicions de ZCS, concentrant les pèrdues de commutació d’apagament a la mateixa branca independentment de la direcció del flux de potència. Aquesta fet possibilita utilitzar tecnologies de semiconductors més econòmiques per aquells que operen en condicions de ZCS. Com a resultat, es considera que una configuració híbrida Si-SiC DAB és l’opció de selecció de semiconductors escollida per aprofitar aquesta proposta. D’altra banda, aquesta tesi proposa dues modulacions de DAB que consideren tots els tres graus de llibertat per optimitzar les pèrdues de conducció i les pèrdues de commutació d’apagament en tot el rang de càrrega i relació de tensions dels costats de contínua. Les equacions i algoritmes d’optimització es presenten i es normalitzen, a més, les solucions òptimes son també representades de forma gràfica. Una contribució clau d’aquesta tesi és el desenvolupament d’equacions per implementar la modulació que minimitza les pèrdues per conducció, garantint alhora les restriccions de commutació en tensió zero (ZVS) i mantenint l’estabilitat. L’aproximació proposada ofereix la possibilitat d’aplicar la solució òptima de forma precisa en tot el rang de funcionament, permetent l’avaluació en temps real amb baix temps d’execució i assegurant una resposta dinàmica ràpida per a qualsevol convertidor DAB. Finalment, l’últim capítol es centra en l’impacte positiu de la inductància de magnetització del transformador en l’ampliació de la regió de funcionament ZVS del convertidor DAB. L’enfocament és comprendre les conseqüències d’aquesta ampliació, especialment en termes d’increment de les pèrdues de conducció. El capítol acaba proporcionant una aproximació analítica manejable per implementar la modulació en temps real.

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Dead-Time for Zero-Voltage-Switching in Battery Chargers with the Phase-Shifted Full-Bridge Topology: Comprehensive Theoretical Analysis and Experimental Verification

Cited by 6 publications

References 20 publications

Control Method for Phase-Shift Full-Bridge Center-Tapped Converters Using a Hybrid Fuzzy Sliding Mode Controller

Control Method for Phase-Shift Full-Bridge Center-Tapped Converters Using a Hybrid Fuzzy Sliding Mode Controller

An improved power loss model of full-bridge converter under light load condition

Design optimization of dual active bridge converter

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