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In this paper, a frequency-doubling LLC resonant converter with high step-down voltage gain for high input voltage applications is proposed. The three-level structure consisting two series half bridges is adopted in the converter to reduce the voltage stresses of the primary-side switches to only half of the input voltage. Thus the low-voltage rated power devices could be used to improve the converter...
This paper presents the analysis of the mechanism of failure modes in bi-directional phase-shift full-bridge converters, composed of MOSFET, based on the circuit operation and parameters considering parasitic components of MOSFET. In addition, the relation between circuit operation and parameters are suggested through the experimental comparison. Using the relation, the suitable ranges of parameters...
A new method to selectively control the amount of dc-link voltage ripple by processing the desired reactive power by a DC/DC converter in an isolated AC/DC or AC/DC/AC system is proposed. The concept can reduce the dc-link capacitors used for balancing the input and output power and thereby limiting the voltage ripple. It allows the use of a smaller dc-link capacitor and hence a longer lifetime and...
The main objective of this paper is to study a seven level multi string converter topology for distributed energy resources based DC-AC conversion system. This paper proposes the Karnaugh mapping technique (which was rarely used in power electronic converters) for modeling the multi string seven level converter. The proposed method can also be extended to ‘n’ level converter. This paper also proposes...
Engineering design of structure and bus bar for a three phase 1.2MVA hybrid clamped five-level (HCFL) converter module is presented in this paper. Firstly, the commutation characteristics of the HCFL topology are analyzed. Based on the analysis, a decoupling structural design is proposed to eliminate the negative effect of high frequency current. Secondly, a laminated design for bus bar is employed...
This paper presents an advanced switching sequence based on boundary control for the Dual Active Bridge (DAB) DC-DC converter applied in a Solid-State Transformer (SST). The implementation of the switching sequence follows the recent advancements in curved switching surfaces for DAB converters — the Natural Switching Surface (NSS) — and contributes to higher efficiency and transient regulation. The...
The proposed active three-phase rectifier circuit utilizing a Flying Converter Cell (FCC) based on the concept of third harmonic injection allows the extension of a passive three-phase diode bridge rectifier to a low-harmonic input stage (THDi < 5%) for applications where dc-link voltage control is not required. In this work the design and experimental verification of a 10kW laboratory prototype...
This paper is focused on the assessment of a modular architecture based on the Dual Active Bridge (DAB) converter in input series, output parallel (ISOP) connection. Previous works have dealt with modeling and control techniques to ensure a proper voltage and power sharing among the modules. In this paper an experimental evaluation of the behavior of the DAB in ISOP connection is carried out in order...
A hybrid phase shifted full bridge (PSFB) and LLC half bridge (HB) dc-dc converter for low-voltage and high-current output applications is proposed in this paper. The PSFB shares its lagging leg with the LLC-HB and their outputs are parallel connected. When the output current is small, the energy of LLC circuit in combination with the energy stored in the leakage inductance of PSFB's transformer can...
The small-signal modeling of dual active bridge (DAB) converter dynamics in discrete time is a useful analysis tool due to the ability to incorporate behavior during zero-voltage switching (ZVS) intervals explicitly, and is advantageous for the direct design of digital compensators. While the control-to-output transfer function has been modeled previously, accurate models of the output impedance of...
This paper presents a compact bi-directional solidstate transformer (SST) based on a current-source topology, featuring high-frequency galvanic isolation and only two minimal power conversion stages. The topology, referenced as Dynamic Current or Dyna-C, can be configured for multiterminal DC and/or multi-phase AC applications. The Dyna-C is robust, can be stacked for MV applications, and be paralleled...
The current technology applied in power electronic converter designs is based on stationary placement of power switches. Most fault tolerant realizations require additional switches (redundancy approach). The motivation behind this paper is to engineer a solution which can allow for a dynamic circuit topology, thereby elevate the size, cost, and complexity issues associated with current technology...
A high frequency, high efficiency bi-directional battery charger for Plug-in Hybrid Electric Vehicle (PHEV) is built with high voltage normally-off GaN-on-Si HFETs. The battery charger topology consists of a 500 kHz Full Bridge (FB) AD/DC stage and a 500 kHz Dual Active Bridge (DAB) DC/DC stage. The system functionality is verified and measured efficiency is 97% for the AC/DC stage and 97.2% for the...
In this paper, a plug-in electric vehicle battery charger is proposed based on SEPIC PFC and LLC topologies. In addition, a new approach in introduced to actively control the dc link voltage and track the maximum efficiency point of a LLC converter over the wide voltage range of the high voltage battery pack. Comprehensive circuit modeling and loss analysis at maximum efficiency point of LLC converter...
A grid-tie solar inverter with capacitor-supported series voltage compensator for reduction of high-voltage dc-link capacitance is proposed in this paper. The series compensator generates a voltage to counteract the voltage ripple on dc-link capacitor. As the magnitude of the AC voltage ripple is smaller than the dc-link DC voltage, the required voltage-current rating of the compensator is small....
This paper introduces a single phase AC/DC converter with unity power factor input at grid side. The proposed topology consists of a diode bridge followed by an asymmetrical DAB circuit working in boost mode. The DAB is utilized to regulate both DC output voltage and averaged input current. With single-side PWM modulation, the DAB can possess advantages such as lower RMS currents and larger soft switching...
This paper proposes the use of the modular multilevel converter (MMC) for ac-dc conversion using medium frequency transformers in a two-stage topology with unidirectional switches. The losses analysis of the propose converter are presented with a comparative studyamong others two topology well know in the literature for traction applications. The basic description of the topology and some simulation...
This paper proposed the design and optimization of parallel DC-DC system for high power applications. A current-driven phase shift full bridge (CD-PSFB) converter with fewer components, lower voltage stress and no snubber is chosen as one of the modules in parallel system and several attractive features that are fit for parallel are analyzed in detail. The amount of CD-PSFB module is first selected...
A single-phase Dual Active Half Bridge (DAHB) DC-DC converter topology is evaluated for medium voltage (MV) application. A 15kV SiC-IGBT based three-level half-bridge is connected to the high voltage (HV) primary side of a high frequency (HF) transformer operating at 10kHz link-frequency. A 1200V SiC-MOSFET based two-level H-bridge is connected on the low voltage (LV) secondary side. This topology...
A compact, isolated, current-source based bidirectional solid state transformer (SST) with configurability for supporting low- or medium-voltage DC and AC application is discussed in this paper. More specifically, design considerations and practical implementation techniques for realizing a 50 kVA 3-phase to 3-phase SST are presented. Results from experimental measurements are shown and discussed.
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