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In three-phase dual-active-bridge (DAB) converter, the zero-voltage-switching (ZVS) range, DC capacitor ripple current and converter efficiency are significantly impacted by the selectable system parameters, including transformer turn ratio n, switching frequency f and leakage inductance Lk. The converter performance also varies with different operation conditions, i.e., input voltage, output voltage...
Wireless power transfer has been introduced as a proper replacement for conventional cable power transfer systems recently. With the developments of the electric transportation, transferring power wirelessly has been found to introduce several advantages in charging Lithium-Ion batteries. Among different configurations of wireless power transfer, Series Parallel structure is found to be more interesting...
Performance analysis and output voltage regulation of a cascaded step-up switched-capacitor converter (SCC) under zero voltage switching (ZVS) condition is analyzed in this paper. The ZVS condition (converter operation above its resonant frequency) provides 1) zero-voltage switching, which leads to a relatively higher efficiency compared to zero current switching (ZCS) under the resonant frequency...
A single-stage direct ac-dc bidirectional resonant converter is proposed. It features natural power factor correction and theoretically gives rise to an ideal sinusoidal ac current. It confines high-frequency circulating current to one bridge as a means to reduce conduction loss. Zero-current switching is achieved in all ac-side switches while zero-voltage switching is achieved in at least two dc-side...
In this paper, the circuit topology of single-stage isolated charging/discharging DC-AC converter with second harmonic current suppression is proposed. Based on which an analogous-rectifying unipolar phase-shifted control strategy with constant charging/discharging current is also proposed, which rectifies the Sinusoidal Pulse Width and Position Modulation(SPWPM) wave of high-frequency(HF) transformer...
This paper presents the influence of switching frequency on the dual active bridge (DAB) dc-dc converter on the power transmission characteristics and the soft switching realization. Based on this, a switching frequency optimization of dual phase shift control is proposed to realize ZVS over the whole load range. It is an optimization of the PWM plus phase-shift control, which can reduce switching...
An optimized modulation based on model predictive control for current-fed dual active bridge converter achieving high efficiency in wide load range is proposed in this paper. The low voltage side switches can realize zero current switching by secondary clamping technique. The pulse width modulation of secondary side switches is encoded with instantaneous power. When in light load, the turn-on moment...
This study presents a new high step-up resonant converter for renewable energy applications. Since, renewable sources introduce relatively low voltage, it is necessary to step up the voltage in order to be used in regular applications. The proposed converter has employed a coupled inductor and a switched capacitor to step up the output voltage. An active clamp circuit has been adopted to guarantee...
This paper describes the analysis of a Dual Active Bridge converter (DAB) with soft switching and the minimum RMS current for the whole power range, using Triple Phase Shift (TPS) modulation. This analysis shows the conditions needed to have zero voltage switching (ZVS) and zero current switching (ZCS), furthermore the minimum RMS current, for all output power range. The validation has been done by...
The aim of this work is to realize a system which ensures the wireless power transfer to supply a load situated at a distance from the source. This system consists mainly of two circuits: one primary and other secondary. In its design one have used the Zero Voltage Switching (ZVS) technique in the primary circuit to improve the efficiency by reducing losses caused by MOSFET switches, and the resonant...
This paper presents a model predictive current control method for a class E resonant inverter for piezoelectric ceramic transducer (PCTs) applications. The capacitor voltage is used to predict a future value of the load current of the PCT. The class E resonant inverter is operated at the suboptimal mode to minimize switching losses of the power switch. Power switches operate under zero voltage switching...
Recent design trends for induction heating appliances are leading to higher power burners that offer unprecedented performance levels to the user. However, this evolution is usually constrained by the maximum power that can be drained from the mains, which is usually limited by the maximum current per phase. To overcome this limitation, the design of multi-phase converters is tackled to increase the...
The input capacitors' voltages are unbalanced under the conventional control strategy in a dual half-bridge cascaded three-level (TL) DC/DC converter, which would affect the high voltage stresses on the capacitors. This paper proposes a pulse-wide modulation (PWM) strategy with two working modes for the dual half-bridge cascaded TL DC/DC converter, which can realize the zero-voltage switching (ZVS)...
The dual active bridge (DAB) topology has been widely used in the industrial field, especially when bidirectional power transfer is required. However, the efficiency improvement of DAB converters is facing challenges and it is worthwhile devoting much effort to it. This paper presents a novel model based on the triple phase shift (TPS) modulation scheme to improve the efficiency of the dual active...
This paper aims to study an active-clamped resonant flyback converter. The proposed resonant technique can increase the zero-voltage switching (ZVS) range. Gallium Nitride high electron mobility transistor (GaN HEMT) devices are also applied in this study to reduce the switching losses at high-frequency operation. Synchronous rectifier is designed on secondary side to minimize the conduction losses...
This paper proposed a new soft-switched non-isolated bidirectional converter for energy storage systems. The hard-switched non-isolated bidirectional converter is improved with additional soft-switch cell incorporated with auxiliary active switches, diodes and passive elements. The main operating characteristics of this topology are to transfer the power flow in both directions from low voltage to...
This paper presents a new ZVZCS three-level inverter with T-type structure. The proposed inverter can achieve ZCS on arm switches and ZVS on neutral point switches by series connecting the arm switches with resonant inductors and parallel connecting the neutral point switches with resonant capacitors. The proposed inverter can achieve a significant reduction in power loss dissipation. In this paper,...
A grid-tied inverter can be designed to operate in boundary conduction mode or discontinuous current mode to achieve high efficiency and high power density. However, the switching frequency variation in boundary conduction mode can be a problem. Although the switching frequency in discontinuous current mode is fixed, the output current becomes distorted due to the resonant between inductor and parasitic...
Effects of the parasitic capacitance Coss of MOSFET devices on soft-switching converters are investigated, especially in terms of power losses, considering that the influence of the nonlinearity of this parameter has been proved. An experimental workbench, which allow measuring the frequency and voltage dependence of the parasitic capacitance, has been realized. A comparison of different super junction...
In this paper, an LLC resonant converter design methodology for battery charger based on mode analysis is presented. The accuracy of DC gain curve obtained by mode analysis is much higher than that by FHA. Conduction loss and switching loss can be minimized by reasonably configuring charging trajectory on the mode distribution map. ZVS and ZCS can be realized during whole charging process. Finally,...
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