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In this paper, a zero-voltage switching DC-AC inverter is designed and realized. The neutral point clamped topology and fix-frequency PWM control are used in the proposed inverter to implement a single-phase DC-AC inverter. Also, an auxiliary inductor and two auxiliary switches are adopted to achieve zero-voltage switching, which can improve the inverter efficiency. In this paper, the proposed DC-AC...
A High Efficiency two-stage AC/DC converter is presented and discussed in this paper, which can be applied in on-board charger for electric vehicles. The front-end converter is a high efficiency ZVS half bridge power factor correction (PFC) topology with only one device in the current flowing path. Owing to the high voltage stress of the half bridge rectifier, the SiC MOSFET is applied to reduce the...
This paper proposes a wireless power transfer system with Class E inverter and half-bridge Class DE rectifier. The proposed system consists of a Class E inverter, a half-bridge Class DE rectifier, and a loosely coupling transformer. Both the inverter and the rectifier achieve zero-voltage switching (ZVS) and zero-voltage derivative switching (ZVDS) at an optimum coupling coefficient. Therefore the...
In this paper, three different phase-shift control schemes for a bidirectional series resonant converter are selected for comparative investigation. Based on the fundamental harmonics approximation approach, steady state solutions are obtained for single-phase-shift control, dual-phase-shift control and modified dual-phase-shift control respectively. An extended study is then performed in terms of...
This work develops a novel single-switch current-fed series-parallel resonant converter for use in direct current (DC) energy conversion systems. The converter comprises a class-E inverter and a series-parallel resonant tank with a bridge rectifier. It uses a single active power switch to reduce the cost of the energy conversion system and control circuits. With a simple circuit configuration and...
In this paper, a Buck-Boost operation in a bidirectional ZVS DC-DC converter is proposed. Initially, the static analysis of the proposed operation is presented, providing fundamental knowledge for a project methodology. Finally, in order to prove the theoretical analyses, simulation results are presented and discussed.
Although SiC-MOSFET has shown significant advantages on switching performance compared with traditional Si counterpart, the dynamic loss of the hard switching SiC-MOSFET converter rises quickly with the increasing of the switching frequency. To further pushing the power density of SiC-MOSFET gird inverter, soft switching inverter with Zero-Voltage-Switching (ZVS) SVM technique is investigated. In...
Due to the realization of zero voltage switching (ZVS) under the full load range, LLC resonant converter is widely adopted in the telecom, battery charger and several applications, characterized with high efficiency, high frequency and high power density, to realize DC conversion. Recently, by using Gallium Nitride (GaN) HFETS, switching frequency of LLC converters is further increased. However, ZVS...
In this paper, based on a double-sided LCC compensation network, the leakage inductance equivalent model of the loosely coupled transformer (LCT) is built and the constant current (CC) output with load independent is analyzed in an inductive power transfer (IPT) system. This paper proposes four resonance conditions for achieving constant voltage (CV) output in various load conditions for the compensation...
Output-inductor-less full-bridge converter for a High-Voltage Direct-Current power distribution system has been proposed. This proposed circuit topology suppresses the surge voltage due to the secondary-side diode's recovery, and miniaturizes the converter because the number of circuit components is reduced. On the other hand, some problems occur, such as the increasing switching-loss of primary switches...
Due to variations of misalignment and clearance, the parameters of the contactless transformer (CT) change a lot, creating great challenge in the design and control of the inductive power transfer systems. In this paper, the characteristics of a S/P compensated resonant converter is analyzed by introducing relative self-inductance coefficient and relative mutual-inductance coefficient to describe...
In this paper, a high power-density output-inductor-less full-bridge converter for the HVDC power distribution system is proposed. The new reduction techniques of switching loss and noise in the output-inductor-less full-bridge converter by using SiC-MOSFETs are applied. As the result, the power loss is reduced by 20W in a wide load range, and the noise is also reduced. Furthermore, a high power density...
This paper presents steady-state analysis and simulation of full bridge current fed dc-dc converter with Synchronous rectification. This converter is best suited for Grid connected Fuel Cell applications. Synchronous rectifier circuit with voltage doubler was implemented on the secondary side of H/F isolation Transformer. Secondary modulation technique helps in reducing blocking voltage spike of the...
With the growth of telecommunication systems in remote areas, demand of wind solar hybrid systems is demanding in this industry. In this paper a 3 MHz DC-DC converter for standalone wind/solar application is proposed. The proposed converter is able to operate at a high frequency and to function in a wide range of input voltage. These specs make the system ideal for wind/solar energy systems. All MOSFETs...
This paper proposes a control method to extend the range of ZVS in the phase-shifted full-bridge(PSFB) converter without any additional auxiliary components. During the dead-time, ZVS is achieved by using the energy stored in the inductors to discharge and charge the output capacitance of switches. By analyzing the equivalent circuit of the converter during dead-time, the relationship between the...
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...
This paper presents a new three-port soft switching dc-dc converter topology based on the bidirectional version of the three-state switching cell, feasible to interconnect battery banks with a dc link and photovoltaic panels. All active switches are designed to operate in Zero Voltage Switching (ZVS). The theoretical analysis and experimental results a 2 kW prototype are presented.
This paper presents a three-port soft switching dc-dc converter topology based on the bidirectional version of the three-state switching cell (3SSC) and dual active bridge (DAB), feasible to interconnect battery banks with a dc link and photovoltaic panels. The converter features high voltage gain and current reduced stress in the converter primary switches. All active switches are designed to operate...
Originated from the dual-bridge resonant converter, a semi-dual-bridge resonant converter is proposed for unidirectional applications in this paper. The single phase-shift modulation is adopted for power regulation. It is proved that the proposed converter is capable to work in either continuous-current mode or discontinuous-current mode. Compared with the dual-bridge resonant converter with single...
A comparison of HF transformer isolated, soft-switched 3-phase LCC-type and (LC)(L)-type dc-dc resonant converters with capacitive output filters including the effect of the HF transformer magnetizing inductances are presented. These converters are designed for the same specifications based on the approximate analysis approach. Intusoft simulation results for both designed converters are given for...
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