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The rapid development of power devices in recent years has led to a proposal of high-power isolated DC-DC converters using medium-frequency (MF) transformers. To realize such converters, it is important to miniaturize magnetic devices such as the transformer and inductor, because the volume of the magnetic devices is larger than that of other components. This paper proposes a procedure for reducing...
In this paper, a center-tapped transformer based bidirectional dc-dc converter with full ZVS operating range is proposed for wide input voltage range applications. The soft switching analysis in different modes is carried out and a simple and effective control strategy, allowing extending the practical ZVS to the whole operating range, is proposed. By dynamically adjusting the phase-shift angle between...
This paper proposes a soft-switched three-port single-stage inverter (TPSI) for a photovoltaic (PV)-battery system. Compared to the existing soft-switched TPSIs, the proposed TPSI has the advantages of using the least number of switches and that all of the switches are capable of being turned on under the zero voltage switching (ZVS) condition. A prototype of the TPSI without using electrolytic capacitors...
In order to reduce the power loss of phase-shift full-bridge(PSFB) converter under light load and standby conditions, this paper proposes a simple control method to achieve zero-voltage switching (ZVS) at light load without any additional auxiliary components. The converter with the proposed control method operates in discontinuous conduction mode (DCM) by decreasing switching frequency and all the...
Point-of-load (POL) power supplies contribute significantly to the overall volume, weight, and cost of many electronic devices. This is mainly due to the fairly large inductor of the buck converter commonly used in these applications, which causes it to have a relatively low power density. The goal of this paper is to propose an alternative converter for POL applications which uses a much smaller...
A generic, Fourier-based method for the derivation of optimal, full-operating-range zero voltage switching (ZVS) modulation schemes for dual active bridge (DAB) converters is presented. Thereby, the AC-link voltages and currents, and the DAB's input current and power flow, are described using trigonometric Fourier series. Furthermore, the amount of charge that is available in the bridge currents to...
This paper introduces a new isolated resonant dc-dc converter topology based on the recently proposed impedance control network (ICN) converter architecture. This new converter maintains very high efficiency by achieving zero voltage switching (ZVS) and near zero current switching (ZCS) across a very wide operating range. Additional performance enhancement is achieved through a new design methodology...
This paper presents an improved efficiency impedance control network (ICN) resonant dc-dc converter that maintains zero voltage switching (ZVS) and near zero current switching (ZCS) across wide ranges in input and output voltages and output power. The improvement in efficiency in this burst mode operated converter is achieved through an optimized startup control that minimizes its startup transient...
This paper proposes a new control strategy for a single phase isolated-dual-active-bridge series resonant converter (IDBRC). The proposed strategy combines both frequency modulation and phase shifting between the two active bridges. The shifted phase is kept at a suitable value to maximize the average power factor of the system and to handle the direction of the power flow. Meanwhile, frequency modulation...
This paper proposes a novel hybrid PWM-resonant isolated boost converter which has a low filter capacitance requirement owing to the two-stepped current waveform driving the output capacitor. An auxiliary circuit comprising of two switches and a parallel LC network is used to achieve zero-voltage-switching (ZVS) operation of the main MOSFETs. Evolution of the topology and basic circuit operation with...
This papar proposes which the Dual Active Bridge (DAB) converter changes between Full Bridge (FB) converter's operation and Half Bridge (HB) converter's operation on the secondary side of the high frequency transformer depending on the output power. With the HB converter operation's, the iron loss of the transformer becomes small because the secondary voltage of the transformer becomes half compared...
A new AC/AC multilevel converter topology suitable for high power applications is presented. The proposed topology has less number of IGBT switches and capacitors compared with traditional approaches. In addition, more than half of the switches are operating in soft switching condition, which considerably decreases the switching losses. The theoretical calculations and simulation results are provided...
A novel transformerless DC/DC converter is proposed in this paper to meet the high step-up, high efficiency and high power requirements. In the proposed converter, the dual switches structure is introduced to reduced the voltage and current stress of the power switches; the active clamping technology is utilized to realize the ZVS switching of all the switches; all the windings are coupled to simplify...
In this paper, we introduce a step-down resonant dc-dc converter architecture based on the newly-proposed concept of an Impedance Control Network (ICN). The ICN architecture is designed to provide zero-voltage and near-zero-current switching of the power devices, and the proposed approach further uses inverter stacking techniques to reduce the voltages of individual devices. The proposed architecture...
This paper presents an interleaved totem-pole bridgeless power factor correction (PFC) rectifier which consists of a coupled inductor and two interleaved bridge arms. The core utilization and power density are improved with the use of coupled inductor. However, it also introduces a serious diode reverse-recovery problem and increases the turn-on loss obviously due to the poor parasitic body diode...
Nowadays there has been an important increase of electric equipment in modern aircraft which leads to a rising demand of electrical power. This highlights the necessity of efficient, reliable and high energy density power converters which rectify three-phase 115V ac to 270V dc for power distribution. This paper presents an isolated single-stage PWM rectifier with the integration of a current injection...
For energy conversion systems that require bidirectional energy transfer between two DC sources, the generally preferred converter topology is a Dual Active Bridge (DAB), particularly when galvanic source isolation is required. However, for maximum efficiency the two bridges should operate under Zero-Voltage-Switching (ZVS) conditions, and hence it is important to be able to accurately identify this...
To increase power conversion density, it is inevitably necessary to increase switching frequency. However, doing so has detrimental effects, including reduced efficiency and increased EMI under hard-switching operation. To prevent the side effects of high switching frequencies, soft switching methods present advantages. In this paper, a lossless passive snubber circuit that operates based on the flyback...
In this paper, we present the design and fabrication of a high density laptop adapter with a Clamped Series Resonant Converter (CSRC), as a possible alternative to traditional Flyback converters for power adapters in portable electronics. The target is to design for universal AC input up to a power of 100 W with power density of 6–7 W/in3. The converter is frequency controlled, and all switches exhibit...
This paper proposes a plug-and-play PV system for DC microgrid based on an analog interleaved flyback converter implementation. The scheme's flexibility allows for the operation to be at the maximum power point tracking (MPPT) or at any power curtailment level, as directed by the DC microgrid control or any suitable analog voltage signal. This novel technique is a very low cost one that utilizes a...
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