In this article, based on the LLC resonant converter fundamental harmonic analysis model, modulation strategies for can be categorized into following three groups: 1) input voltage modulation; 2) tank elements and 3) secondary equivalent impedance modulation. Operational principles control diagrams different are given. Comprehensive comparisons between these in terms of topology complexity, gain range presented with respect to same system specifications. The advantages disadvantages each...

In order to realize power flow control among photovoltaic (PV) panel port, battery and load port in the distributed generation system, integrated three-port dc-dc converters (TPCs) are widely adopted. The objective of this article is provide a comprehensive, comparative, insightful analysis overview these TPCs. First, based on transmission requirements five topological structures conversion system (TPCS) composed two or three two-port presented. And comparatively analyzed. Second,...

In this paper, a dual half-bridge <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converter with magnetic control is proposed for the battery charger application. The primary switches are shared by two networks, and their outputs connected in series. One of converters designed to operate at series frequency, which also highest efficiency operating point, constant output voltage characteristic achieved point. second adopts...

The cascaded H-bridge (CHB) inverter is one of the most attractive multilevel topologies for renewable energy applications. Due to fact that CHB inverters employ a large number components, they suffer from higher probability fault, which reduces system reliability. A fault-tolerant operation described in this article. New features ensure reliable and robust converter event fault. proposed strategy uses an additional cross-coupled (X-CHB) unit companion with existing units support output...

The LLC resonant converters commonly adopt frequency modulation (FM) or combination of FM with phase-shift to regulate its output voltage. However, in these control schemes, a variable switching range is required, which makes the magnetic components design complicated. Therefore, this article, (or inductor control) adopted make converter operating at constant and duty cycle. fundamental harmonic analysis used because characteristic simplicity. accuracy method reduced considerable errors...

LLC resonant converters have been widely used in many different industrial applications. Analysis and design methodologies great effect on the converter performance. Accordingly, a complete step-by-step optimal methodology based time-domain analysis has proposed for an this article. The is implemented under worst operation condition, following considerations are included to obtain suitable area: mode; voltage stress capacitor; zero switching primary switches; tank root-mean-square current....

Energy-efficient and grid-friendly railway power system is critical for the sustainable development of electrified railways. In this paper, a cascaded energy storage (CESS) investigated efficiency quality improvement system. First, detailed operation principles CESS multiple control objectives, including regenerative braking (RBE) utilization, reactive compensation, negative sequence current suppression, are analyzed. On basis, hierarchical flow strategy developed achieving management...

High step-up boost converters with coupled inductor have attracted much attention in the fuel cell or photovoltaic grid-connected generation system, however, there are few literatures elaborated on construction ideas and derivation methods of them. Accordingly, order to obtain a clear roadmap inner connection these converters, comprehensive review analysis presented this paper. First, basic converter is regarded as topology, its merits demerits analyzed detail. Then, address demerits,...

Conventionally, LLC resonant converter adopts frequency control (FC) or combine FC with phase shift (PSC) to regulate the output voltage.However, for both strategies, a variable switching operation range is required, which makes magnetic component and driver circuit design complicated.In this paper, (MC) inductor adopted converter.Thanks MC, constant duty cycle can be implemented primary switches.A comprehensive analysis of magnetically controlled presented, includes principle, voltage gain,...

LLC resonant converter is one of the most popular isolated dc/dc converters owning to its advantages simple control, wide voltage gain regulation capability, and soft switching operation. Nevertheless, high efficiency power density are always goals for converters. To further increase conversion efficiency, synchronous rectification (SR) technology adopted, where uncontrolled diodes on secondary side replaced with SR MOSFETs. Due extreme low on-state resistance value MOSFET, considerable...

In this letter, a magnetically controlled single-stage ac-dc converter is proposed for low-power application which has the following features. First, operation achieved by sharing switches between LLC resonant and totem-pole bridgeless power factor corrector (PFC) converter. Second, correction function inherently designing PFC to operate in discontinuous conduction mode. Third, dc-link voltage almost constant. Fourth, fixed switching frequency duty cycle can be implemented switches,...

A five-degree-of-freedom (5-DOF) modulation scheme is proposed in this article for dual active bridge converter to improve its efficiency a wide operation range. First, the possible modes of under 5-DOF analyzed. As result, 11 effective are obtained and their steady-state characteristics expressions solved, including inductor root-mean-square (rms) current, peak-to-peak transmission power, etc. It worth mentioning that current expression simple it can be regarded as an indicator rms current....

Asymmetric duty modulation (ADM), as a recently proposed scheme, provides new chance to improve the performance of dual active bridge (DAB) converter. On this basis, an optimal ADM (OADM) scheme is in article minimize inductor peak-to-peak current over whole voltage and power range. First, DAB converter adopting analyzed frequency-domain time-domain, four operating modes are established. Then, minimum for each mode obtained under Karush-Kuhn-Tucker condition, corresponding closed-loop...

In order to further improve the efficiency of dual-active-bridge (DAB) converter, a hybrid five-variable modulation scheme with minimal root mean square (rms) current is proposed in this article, which combines traditional phase-shift and pulsewidth schemes. By adopting optimal scheme, wider zero-voltage switching (ZVS) operation range lower rms level are achieved simultaneously when compared other schemes, significantly improves DAB converter. Moreover, for complexity five variables,...

The LLC resonant converters have been widely used in many applications due to their features such as wide input voltage range, high efficiency, and power density. Therefore, the analysis methodology for converter is of great importance. Based on existing literature, there are mainly four methodologies: (i) fundamental harmonic analysis; (ii) frequency domain with time partial correction; (iii) complete (iv) or operation mode-based analysis. However, no systematic view study different...

Although LLC converters are attractive in industrial applications due to its advantages of soft switching, high efficiency, and simple control, wide voltage gain range applications, large switching frequency operating is required, which may cause the loss operation existence control instability issue. In this article, a novel converter with two resonant tanks proposed. The proposed has three modes, namely, dual full-bridge mode, half-bridge can cover range, medium low operations,...

In this article, an efficiency-oriented hybrid duty modulation (HDM) scheme is proposed for the dual active bridge (DAB) converter that can reduce inductor root-mean-square (rms) current and extend switch soft-switching range. First, a complete description of combination forms different schemes presented considering allocation zero-voltage portion. A unified these obtained in frequency domain. Second, symmetric-symmetric (SSDM) asymmetric-symmetric (A <sub...

This paper presents a performance investigation and design optimization of high efficiency three-level Active Neutral Point Clamped (ANPC) inverter topology using hybrid Si/SiC switches. It uses modulation strategy that produces cluster low frequency switches commutating at fundamental line (realized with Si IGBTs) carrier switches) to facilitate tradeoff between the cost. A generalized current rating ratio algorithm is presented for based on power loss profile ANPC inverter. determines...

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Hold-up time operation is a crucial requirement for distributed power systems and server supplies. LLC resonant converter widely used in these applications due to its high efficiency density characteristics. Conventional pulse frequency modulation (PFM)-controlled inductor-inductor-capacitor (LLC) requires wide switching range satisfy the hold-up requirement. In this article, novel control scheme proposed stacked structure converter. During normal operation, doubler strategy adopted reduce...

In the field of electric mobility, in particular heavy-duty vehicles and long-haul trucks, energy systems are susceptible to transients with different amplitudes dynamics due high power demand. With combination long distances, available battery technologies become insufficient as a single source for such system. Thus, integration hybrid storage (HESSs) capabilities, fuel cells, packs, supercapacitors, is highly required. this context, leveraging HESSs an efficient way, resonant multiwinding...