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By utilizing one coupled inductor and two auxiliary diodes, the bridgeless boost rectifier has a lower conduction loss and no diode reverse recovery problem. Detailed analysis of the novel boost rectifier is presented in this paper. The experimental results of a 300W prototype was analyzed and the excellent performance of the bridgeless boost rectifier was also shown. Dual Boost PFC brings higher...
A frequency modulation scheme is proposed for a Capacitor-Inductor-Inductor-Capacitor (CLLC) Resonant Dual Active Bridge (RDAB) that relies on dynamic retuning of the resonant capacitors to the switching frequency as it is modulated. The proposed modulation scheme greatly reduces the circulating reactive currents in the High Frequency Link (HFL) by operating at a range of fixed discrete switching...
This paper presents a novel micro-inverter topology for a single-phase grid-connected photovoltaic (PV) system which is based on two stages. The first stage is forward-flyback DC-DC isolated high step-up converter for achieving high voltage gain and efficiency while the second stage is the soft switching full bridge inverter. The full-bridge DC/AC inverter is implemented with one leg operating in...
Constant current distribution systems such as under-sea power distribution systems use power converters with a constant input current as a source of input power. This paper analyzes minimum requirements for passive zero-voltage-switching (ZVS) components of dc-dc series resonant converters (SRCs) in dc distribution systems. A steady state analysis of the technique shows that the input voltage varies...
A very simple, low component count snubber is used in order to get ZCS for all the switches of a three-level voltage step-down converter. ZCS allows for the implementation of the switches with insulated-gate bipolar transistor which are able to withstand large input voltages at large power. The snubber is placed in the secondary-side, before the rectifier. The transformer leakage inductance is used...
Silicon Carbide (SiC) MOSFETs are being increasingly utilized in medium and high power electronics converters (>1 kW) because of the significantly lower switching and conduction losses when compared with conventional power switches such as the Si IGBT. SiC MOSFET based converters operating at high frequency can achieve high efficiency and high power density at the same time. Minimum switching loss...
LED lighting has attained maximum acceptance in the recent past for indoor, outdoor and special purpose applications. In most of the battery driven / PV based applications, efficient constant current driving of LED arrays is essential. Therefore, adopting soft switching for the power switch is important to achieve greater efficiency at higher frequencies, simultaneously realizing better power densities...
This paper proposes a switched capacitor based non-isolated zero voltage switching (ZVS) bi-directional dc-dc converter. By implementing a switched capacitor loop, it can provide high step up and step down gain. The converter is operated in continuous current mode (CCM) mode where all the power transistors are soft switched by means of dedicated auxiliary resonant networks. Each network consists of...
This paper proposes an asymmetrical high-step-up DC-DC power converter for photovoltaic (PV) power system applications. The proposed topology presents a combination of soft switching technique and high-step-up features, and can be used to boost the low PV output voltage to an adjustable high voltage with high efficiency. The proposed topology has been validated by PSIM simulation and experiments.
The introduction of micro-converter is effective in order to extract maximum energy from solar power. Boost and buck-boost type dc-dc converters generally consist of the micro converter. Downsizing the micro-converter is required because it is installed to each solar cell. The operation in the high frequency is required for downsize the power converter. Soft switching technology is effective in such...
Medium voltage DC (MVDC) grid has quite a lot advantages for the application of large power electric ships, while the DC breaker and DC distribution are the key equipment. Solid state transformer (SST) composed by power electronics transformer and high-frequency transformer has high power density and high efficiency, so it can be used for the power conversion from MVDC to low voltage DC or AC, especially...
This paper compares the efficiency of DC/DC Boost converter using SiC fly-wheel diode or synchronous rectifier in different working modes. Analyze the high current spike during turn-on transient of main switch based on simulation. The method to realize soft switch without additional devices is discussed and the problems existing in this method can be solved by the application of the new device effectively.
An improved non-isolated coupled-inductor-based high-step-down converter is presented in this paper. Compared with other coupled-inductor-based high-step-down converters, the proposed converter features zero DC-offset current and non-pulsating output current. In the proposed converter, one of the DC-blocking capacitors is connected between the input voltage and the coupled inductor. Therefore, the...
This paper presents an innovative resonant multilevel modular bidirectional dc-dc switched-capacitor converter based on GaN switching devices. Proposed converter achieves the following advantages; soft switching, low voltage device rating, boost or buck mode, common ground, high conversion ratio, variety of environment temperature operation, simple control algorithm and modular structure. The proposed...
SiC and GaN power transistors switching energy are compared in this paper. In order to compare switching energy Esw of the same power rating device, a theoretical analysis is given to compare SiC device conduction loss and switching losses change when device maximal blocking voltage reduces by half. After that, Esw of a 650V GaN-HEMT is measured in hard switching condition and is compared with that...
A fully Soft switched current-fed parallel resonant full-bridge converter with closed loop control is proposed for PV applications. The proposed converter is capable to achieve soft switching in all the active switches with the aid of new modulation technique. Efficiency of the proposed converter is high as there are no lossy snubbers used. The proposed converter maintains soft switching and tight...
Performance of a current-fed bidirectional LLC resonant converter for energy storage system in DC grid applications is analyzed and tested. The well match of the voltages on two sides of the LLC circuit is ensured by varying the duty cycle of buck-boost circuit under wide battery voltage range. Hence LLC circuit is operated like a DC transformer to improve efficiency. In the battery discharging mode,...
In this paper new dc/dc converter with zvs and high gain is proposed. The proposed circuit decreases the switches voltage impulse at turn off time because of inductance. Soft switching condition will be take place for all switches. Converter control gate signals are PWM and the switch for soft switching pulse is negate of other switch. In suggested converter, Extra inductor is inserted in old converter...
This paper presents a novel circuit topology of the class-E rectifier by introducing the concept of the class-F rectifier into the basic class-E rectifier. In the proposed class-E rectifier, a harmonic component is added to the switching device of the basic class-E rectifier. Therefore, the proposed class-E rectifier possesses the strengths of both the class-E and -F rectifiers, enabling simple configuration,...
Basic Boost converter topology is the most popular topology used in power factor correction circuits. The efficiency and performance of the boost converter depends on the switching frequency affecting the switching loss. This paper presents a soft-switching boost converter that used to convert photovoltaic panels output level. The converter is suitable for variable boosting factor and high efficiency...
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