A bidirectional dc-dc converter typically consists of a buck and boost converters. In order to have high-power density, the can be designed operate in discontinuous conducting mode (DCM) such that passive inductor minimized. The DCM operation associated current ripple alleviated by interleaving multiphase currents. However, tends increase turnoff loss because high peak its parasitic ringing due oscillation between device output capacitance. Thus, efficiency is suffered with conventional...

The transition to electric road transport technologies requires traction drive systems offer improved performances and capabilities, such as fuel efficiency (in terms of MPGe, i.e., miles per gallon gasoline-equivalent), extended range, fast-charging options. enhanced electrification transformed mobility are translating a demand for higher power more efficient that lead better economy given battery charge. To accelerate the mass-market adoption electrified transportation, U.S. Department...

Lithium-ion-based battery energy storage system has started to become the most popular form of for its high charge and discharge efficiency density. This paper proposes a high-efficiency grid-tie lithium-ion-battery-based system, which consists LiFePO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -battery-based bidirectional ac-dc converter. The management estimates state health each cell applies active equalization balance all cells...

A novel, high-efficiency inverter using MOSFETs for all active switches is presented photovoltaic, nonisolated, ac-module applications. The proposed H6-type configuration features high efficiency over a wide load range, low ground leakage current, no need split capacitors, and low-output ac-current distortion. detailed power stage operating principles, pulsewidth modulation scheme, associated multilevel bootstrap supply, integrated gate drivers the are described. Experimental results of 300...

This paper proposes a maximum power point tracking (MPPT) algorithm for small-scale wind energy conversion systems. The proposed uses the dc current as perturbing variable. detects sudden speed changes indirectly through dc-link voltage slope. slope is also used to enhance of and prevent generator from stalling under rapid slowdown conditions. method two modes operation: A perturb observe (P&O) mode with adaptive step size slow fluctuation conditions, prediction employed fast change...

The high-brightness white-light-emitting diode (LED) has attracted a lot of attention for its high efficacy, simple to drive, environmentally friendly, long lifespan, and compact size. power supply LED also requires life, while maintaining efficiency, factor, low cost. However, typical design employs an electrolytic capacitor as the storage capacitor, which is not only bulky, but with short thus hampering performance improvement entire lighting system. In this paper, novel factor correction...

Modular photovoltaic (PV) power conditioning systems (PCSs) require a high-efficiency dc-dc converter stage capable of regulation over wide input voltage range for maximum point tracking. In order to mitigate ground leakage currents and be able use high-efficiency, nonisolated grid-tied inverter, it is also desirable this microconverter provide galvanic isolation between the PV module inverter. This paper presents novel, isolated topology that meet high efficiency requirement. yields through...

Effective photovoltaic power conditioning requires efficient conversion and accurate maximum point tracking to counteract the effects of panel mismatch, shading, general variance in output during a daily cycle. In this paper, authors propose an integrated boost resonant converter with low component count, galvanic isolation, simple control, as well high efficiency across wide input load range. Provided is discussion synthesis, key operational features, design procedure, loss analysis,...

An improved twin-bus converter using n + 1 active switches is proposed for the n-string LEDs to be dimmable from true zero rated current level. The n-switches that perform current-loop regulation can operate at very high frequency because of significantly reduced voltage stresses, while achieving efficiency over a wide load range. dimming switch, however, low ensure high-efficiency operation without light flicker. detailed power stage operating principle and control scheme individual string...

In this paper, a novel isolated dc-dc converter topology for medium-voltage (MV) applications is proposed by combining the advantages of resonant converters and dual active bridge (DAB) converters. normal load scenario, operates in an open loop mode with fixed switching frequency equals to series tank. Thus, zero voltage turn on at primary side current off secondary are secured from full load. When overload happens, capacitors will be clamped output additional paralleled diodes. The...

This paper first introduces the design of an ultrahigh efficiency 50-kW bidirectional dc-dc converter at zero-voltage-switching operation, and then, a high-precision measurement method using regenerative approach. The is achieved with 1) use CoolMOS as main switch under zero-voltage soft switching condition; 2) multiple-phase legs for current sharing to reduce conduction loss; 3) coupling inductors between each two-phase core loss. Two identical hardware prototypes were designed, fabricated,...

A novel soft-switching inverter using two small coupled magnetics in one resonant pole is proposed to ensure the main switches operating at zero-voltage switching from zero load full and auxiliary zero-current with adaptability current stress. Since independent structure avoids unwanted magnetizing freewheeling loop, size of can be minimized low inductance, saturable inductor eliminated. Detailed circuit operation described, voltage-second balance condition expressed mathematically. 4-kW...

A novel, high-efficiency inverter using MOSFETs for all active switches is presented photovoltaic, non-isolated, AC module applications. The proposed H6-type configuration features high efficiency over a wide load range, low ground leakage current, no need split capacitors, and output AC-current distortion. detailed power stage operating principles, PWM scheme, novel bootstrap supply the are described. Experimental results of 300 W hardware prototype show that not only MOSFET body diode...

A novel soft-switching converter combining resonant half-bridge and phase-shifted pulsewidth modulation (PWM) full-bridge configuration is proposed to ensure the switches in leading-leg operating at zero-voltage switching from true zero-load full-load, lagging leg working zero-current with minimum duty cycle loss circulating conduction by significantly reducing leakage or series inductance. Experimental results of a 3.4-kW hardware prototype show that circuit achieves full-range soft 98%...

In this paper, a unified current controller is introduced for bidirectional dc-dc converter which employs complementary switching between upper and lower switches. The to use one both buck boost modes. Such may be designed with analog implementation that adopts injection control method, difficult implemented in high power applications due parasitic noises. averaged mode thus proposed paper avoid the sensing related issues. Additional advantage digital also found smooth transition battery...

Existing photovoltaic (PV) panels have widely varying input voltages based on the panel configuration and size. In this paper, a novel topology with single active switch - combining boost, flyback, charge-pump circuits is proposed in order to achieve wide range, high voltage gain, efficiency, low cost simultaneously. It meets input-voltage power-level needs of majority modern PV while still being suitable for connection highvoltage dc bus. The circuit has been designed, simulated,...

This paper presents the development of a distribution network solid state transformer (SST) based on high voltage (13kV) SiC MOSFET and JBS diode. SST is composed with medium ac/dc rectifier, frequency dc/dc converter low inverter. It's able to be interfaced 3.6kV grid output both 400V dc 240/120V ac. characterization devices, design rectifier converter. The test results its grid-connected operation including pre-charge, start up, regeneration, etc. are included show functionalities designed...

This paper introduces a high-efficiency and high-density single-phase dual-mode cascaded buck-boost multilevel transformerless photovoltaic (PV) inverter for residential application. topology combines regulated H-bridge stage with an unregulated GaN-based ac boost converter. The the share common inductor. Compared traditional PV inverter, this significantly enlarges input voltage range due to additional boost. And, flexible number of panels can be used. To control multiple dc-link voltages...

A novel carrier-based unipolar-sinusoidal pulse width modulation (SPWM)-oriented technique with synchronous rectification for isolated bidirectional single-stage high-frequency-ac link dc-ac converters using SiC MOSFET is presented in this paper. The converter composed of a full-bridge (FB) inverter cascaded cycloconverter through high-frequency transformer. unipolar-SPWM-oriented proposed to realize zero-voltage-switching (ZVS) the FB and zero-current or (ZVS/ZCS) all load ranges, suppress...

Virtual oscillator control (VOC) is a nonlinear grid-forming controller that simultaneously achieves the functionality of output voltage and primary layers in power electronics interfaced distributed generation (DG) unit. Unlike conventional phasor-based methods such as droop virtual synchronous machine control, VOC time-domain can guarantee almost global asymptotic synchronization. However, high-frequency dynamics has largely been ignored analysis prior art; result, VOC-based DGs fail to...

Two carrier-based unipolar-sinusoidal pulse width modulation (SPWM)-oriented techniques for an isolated bidirectional dc-ac converter are proposed, compared, and validated in this paper. The is composed of a full-bridge (FB) inverter cascaded with cycloconverter through high-frequency transformer. Both proposed paper can realize zero-voltage switching (ZVS) the FB zero-current or ZVS all load range, able to suppress voltage spikes introduced by transformer leakage inductance as well. In...

With the commercialization of wide bandgap power devices such as SiC MOSFETs and JBS diodes, electronics converters used in harsh environments hybrid electric vehicles aerospace attract more attentions. The low loss, high temperature fast switching capabilities are utilized to improve density efficiency. However, EMI problem caused by is a major constrain for improving frequency. For this reason, an integrated module with 1.2kV MOSFET ultra-fast gate drive circuits proposed developed. Two...

With growing interests in low-inductance silicon carbide (SiC)-based power module packaging, it is vital to focus on system-level design aspects facilitate easy integration of the modules and reap benefits. To effectively utilize modules, busbar interconnects should also be designed with low stray inductances. A holistic investigation flux path cancellations module-busbar assembly, which can treated as differentially coupled series inductors, thus mandatory for a design. This article...

A capacitor voltage balancing method is proposed for a full-bridge neutral point diode clamped (NPC) dual-active bridge (DAB) converter. In existing literature, achieved by actively selecting between the small vectors, i.e., connecting either upper or lower on dc bus to transformer winding, basis of measured mismatch. These methods are dependent direction power flow through DAB this work, we propose controller, which independent and does not require adjustments active vectors modulator....

Tetraploid oysters are artificially produced that do not exist in nature. The successful breeding of 100% triploid resolved the difficulties traditional drug-induced triploids, such as presence drug residues and a low induction rate. However, little is known concerning biochemical composition nutrient contents tetraploids. Therefore, we investigated compositional differences among diploid, triploid, tetraploid Crassostrea gigas well between males females diploids findings indicated glycogen,...