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In this paper, a variable dc bus control strategy is evaluated for a bidirectional grid connected electric vehicle (EV) charger topology. The EV charger under consideration comprises of an ac-dc 3-φ active rectifier stage followed by a dc-dc dual active bridge (DAB) converter. The voltage of the common dc-link between the ac-dc stage and the dc-dc stage is regulated such that it follows the voltage...
This paper presents a novel zero-voltage-switching approach for predictive boundary conduction mode PFC converter for LED lighting. In the proposed method, instead of being detected by a sensing circuit, the switching off-time for achieving zero-voltage-switching is determined by analytical equations of PFC converter. Therefore, the efficiency reduction caused by sensing circuit can be eliminated...
The single-ended forward converter is a buck derived Isolated DC-DC Converter. Forward converter is most suitable for low voltage and high current applications microprocessors, battery chargers, EHV etc. The active clamp transformer reset technique offers many advantages over conventional single-ended reset techniques, including lower voltage stress on the main switch, the ability to switch at zero...
This paper presents a soft switching technique to improve the efficiency of isolated and non-isolated power converters in the high-frequency range. The designed converter uses two switches i.e. main switch and auxiliary switch which are operated in Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) respectively. Here, different circuit modes of ZVS PWM buck converter with the proposed ZCS...
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...
This paper presents a comparative study on high-frequency active rectifier-based zero voltage soft-switching (ZVS) resonant dc-dc power converters with Gallium Nitride Heterojunction-Field-Effect-Transistor (GaN-HFET) for inductive power transfer (IPT) systems. The two types of active rectifiers, i.e. high-frequency bridgeless rectifier (BLREC) and totem-pole rectifier (TPREC) are adopted for the...
High voltage and wide bandgap (WBG) semiconductor devices like the 15 kV SiC MOSFET have attracted a lot of attention because of their potential applications in high voltage and high power converters. However, they are not commercially available at present and their high cost might be a hindrance to their widespread adoption in future. To address the commercial unavailability and the high cost issues...
This paper proposes a single-stage high-power-factor asymmetrical half-bridge AC-DC converter for power factor correction. The proposed converter is developed by integrating an asymmetrical half-bridge DC-DC converter with a set of coupled inductors and a blocking diode to achieve the single-stage AC-DC conversion with the buck-boost type power factor correction. By using the coupled inductors, the...
This paper proposes a high efficient soft-switching multiple-input positive buck-boost converter. Multiple-input converters (MIC) use usually forward-conducting-bidirectional-blocking (FCBB) switches to control their input voltages and currents. However, these FCBB switches may decrease the overall system efficiency because of their switching losses. This paper applied a soft-switching method into...
An edge-resonant soft-switching time-sharing (TS) multiple-input (MI) dc-dc converter is introduced in this paper. The proposed converter can achieve high efficiency with zero-current switching (ZCS) and zero-voltage switching (ZVS). The zero-current switching (ZCS) can be realized on switch turned-on states, and the zero-voltage switching (ZVS) can be realized on switch turned-off states. In addition,...
This paper analyzes a DC-DC Dual Active Bridge (DAB) converter in order to obtain Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS) in all the switches for any power range. This analysis shows the conditions that should be fulfilled to achieve ZVS and ZCS; also, it presents all the DAB switching modes that appear when a triple phase shift (TPS) modulation is used. Soft switching reduces...
A novel modulation technique for single phase grid-tied inverter is proposed in this paper. In normal discontinuous current mode (DCM) operation, the output current becomes distorted due to the resonant between parasitic output capacitors of switching devices and inductor during zero current periods if no current control method is applied. This low frequency distortion can be improved in the boundary...
This paper presents a single-stage isolated softswitching tri-port converter for integrating a renewable resource like solar PV, and energy storage with single-phase AC grid through high-frequency galvanic isolation. The single-stage approach reduces the component count, and the full-range softswitching feature realizes higher efficiencies compared to the state-of-the-art methods. A significant advantage...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
One of the primary requirements of dual active bridge (DAB) dc-dc converters is to operate under zero voltage switching (ZVS), to reduce switching losses and increase operating efficiency. However, three-phase DAB converters are known to have limited capability to operate in ZVS, particularly at low power levels, because of their inherent two-level six-step phase shifted square wave modulation strategy...
In modern aircraft designs, there is a need for new high power isolated DC/DC converters. Full bridge derived topologies are appropriate for these specifications. Aircraft specifications are demanding and a high power density is needed. In order to decrease volume, reactive component, such as the transformer have to be optimized in volume, weight and loses. High frequency is needed to decrease inductive...
Improving the power density of a power converter has many benefits for systems integration. Aspects such as thermal management, weight, conformation to mounting locations, and the footprint of the converter all become critical factors as systems continue to scale down in size. The flying-capacitor multilevel (FCML) converter topology is of interest because it has characteristics which contribute to...
This paper presents a single-stage soft-switching high-frequency link isolated converter for bidirectional motor drive applications. The ‘minimal’ topology is based on the recently proposed soft-switching solid-state transformer (S4T) with a single current-source power conversion stage. This single stage approach reduces total switch rating, provides sinusoidal input and output voltages, and uses...
Single stage power factor corrected (SSPFC) AC-DC converters are attractive in particular applications because they are less expensive than conventional two-stage converters. One of the main drawbacks of SSPFC converters, however, is that their intermediate DC bus voltage varies considerably when used in universal voltage range applications. A new method for reducing the DC bus voltage variation for...
Hybrid renewable energy systems (HRESs) have been introduced to provide reliable green energy by combining different renewable resources as renewable resources are intermittent in nature. Renewable resources are typically compatible with DC distribution. Therefore, highly efficient high voltage DC (HVDC) distribution is the way to the future for HRESs. Multi-input converters (MICs) have been presented...
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