High-efficiency and compact single-phase inverters are desirable in many applications such as solar energy harvesting electric vehicle chargers. This paper presents a 2-kW, 60-Hz, 450-VDC-to-240-VAC power inverter, designed tested subject to the specifications of Google/IEEE Little Box Challenge. The inverter features seven-level flying capacitor multilevel converter, with low-voltage GaN switches operating at 120 kHz. also includes an active buffer for twice-line-frequency pulsation...

Traditionally, switched-capacitor (SC) converters have suffered from high transient currents, which limit both the efficiency and power density of such converters. Soft-charging operation can be employed to eliminate current transients greatly improve SC In this approach, a second-stage magnetic converter is cascaded with stage act as controlled load. Another approach use resonant zero-current switching. This paper shows that soft-charging operations are closely related, technique will...

Abstract 2D perovskites demonstrate higher moisture stability, oxygen content, thermal and a significantly lower ion migration/phase transition occurrence in comparison to 3D perovskite. These advantages imply huge potential for perovskite commercial applications the photovoltaic field. However, horizontal arrangement of organic layer severely hinders transport carriers, thus, power conversion efficiency solar cells (PSCs) is than that 3D. Controlling crystallization orientation achieve...

Abstract Zero‐dimensional (0D) structure‐based manganese metal halides (MHs) are believed to be the most promising candidates for next‐generation X‐ray scintillators due their intense radioluminescence and environmental friendliness. However, low‐temperature (<180 °C), large‐area integration with more efficient detection remains a tremendous challenge. Herein, from perspective of cation (ionic liquids) structure design, basic physical parameters 0D MHs regulated. And calculations...

A high-efficiency, high-power-density buffer architecture is proposed for power pulsation decoupling in conversion between dc and single-phase ac. We present an active solution that yields improved efficiency reduced circuit complexity compared to existing solutions. In the architecture, main energy storage capacitor connected series with converter across bus. The series-stacked blocks majority of bus voltage reduce stress on converter, such fast, low-voltage transistors can be employed...

Switched-capacitor (SC) converters are gaining popularity due to their high power density and suitability for on-chip integration. Soft-charging resonant techniques can be used eliminate the current transient during switching instances, improve efficiency of SC converters. In this paper, we propose a split-phase control scheme that enables Dickson converter achieve complete soft-charging (or resonant) operation, which is not possible using conventional two-phase control. An analytical method...

This paper investigates the use of multilevel conversion in dc-dc applications that require a large voltage ratio. A quantitative method can serve as guide to compare and design topologies for ratio is presented. The proposed keeps conduction loss switching constant across different converters employs passive component volume single performance metric. As examples, flying capacitor hybrid switched-capacitor (SC) are compared conventional two-level buck converters, shown analytically have...

Resonant switched-capacitor (ReSC) converters have efficient utilization of both active and passive components, hold the potential to achieve higher efficiency power density than conventional (SC) magnetic-based converters. This article presents a new hybrid/resonant SC converter topology, comprising two cascaded 2-to-1 ReSC converters, address high-conversion-ratio applications. The proposed resonant has simple structure operation principle can one best overall metrics among popular...

High efficiency and compact single phase inverters are desirable in many applications such as solar energy harvesting household appliances. This paper presents a 2 kW, 60 Hz, 450 VDC to 240 VRMS power inverter, designed tested subject the specifications of Google/IEEE Little Box Challenge. The inverter features 7-level flying capacitor multilevel converter, with low-voltage GaN switches operating at 120 kHz, highest switching frequency date this level. also includes an active buffer for...

Capacitor voltage natural balancing is an attractive feature of flying capacitor multilevel (FCML) converters. However, with the commonly used phase-shifted pulsewidth modulation, voltages still can deviate, and active often required. Although mechanism its dynamics have been extensively studied in existing literature, some sources that are responsible for imbalance engineering practice unclear. This article experimentally investigates origins practical implementations such It presents...

The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has increased rapidly to 25.7% in 2022. There is growing curiosity about whether it will increase further up the PCE limit. Understanding fundamental energy loss mechanism and targeted treatment crux step forward, especially definite management photons PSCs. Here, we first briefly review main modes photon PSCs illustrate significance recycling. Next, historical research trials overcome these mechanisms are highlighted,...

Metal halide semiconductors have huge potential on X-ray detection, due to their high atomic number, adjustable photoluminescence wavelength, superior stability, and simple fabrication process. Here, cesium lead nanocrystals (CsPbX3 NCs) are fabricated paper substrate as scintillator screen for the first time. By means of all-solution processed spray-coating method with optimization polymethyl methacrylate, large-area (>600 cm2) low-cost (0.0975 dollar cm−2) flexible screens obtained...

This review introduced the research progress and present situation of solar blind detectors based on metal halide perovskite (MHP) in recent years from different dimensions: three-dimensional, two-dimensional, one-dimensional zero dimensional.

Multilevel topologies are an appealing method to achieve higher power density inverters for both mobile and stationary systems. This work discusses the design development of a 13-level, flying capacitor multilevel (FCML) inverter. Operating from 800 V bus, this inverter requires switches with voltage blocking capability less than 80 V. A 120 kHz switching frequency is enabled through use GaN FETs custom integrated cells, which reduce commutation loop inductance allow modular design....

This paper presents a power factor correction (PFC) front end based on seven-level flying capacitor multilevel (FCML) boost converter. Compared to the conventional two-level converter, proposed FCML converter features use of low-voltage-rated transistors, reduced voltage stress, and high effective switching frequency filter inductor. These characteristics lead drastic reduction in inductor size while maintaining efficiency and, therefore, significantly improve density PFC compared solutions....

A major challenge in the implementation of flying capacitor multilevel (FCML) converters and hybrid switched-capacitor (SC) is providing gate drive power to large number floating switches. common solution uses isolated dc/dc converters, which are bulky, expensive, energy inefficient. To design more compact efficient supply circuits, five methods presented compared this article: bootstrap at deadtime, cascaded with low-dropout (LDO) regulator, double charge pump, gate-driven synchronous...

Multilevel topologies are an appealing method to achieve higher power density converters for both mobile and stationary systems. This article discusses the design high-performance hardware implementation of a 13-level, flying capacitor multilevel (FCML) inverter. Derivation sizing ac output voltages (for arbitrary level FCML) is provided. Operating from 800-V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> bus, this prototype utilizes...

This work investigates the use of multilevel conversion in dc-dc applications that involve a large voltage ratio. A quantitative method can serve as guide to compare and design topologies for ratio is presented. The proposed keeps conduction loss switching same across different converters employs passive component volume single performance metric. As examples, flying capacitor (FCMC) hybrid switched-capacitor (SC) are compared conventional two-level buck converters, shown analytically have...

Single-phase inverters and rectifiers require the use of an energy buffer to absorb twice-line-frequency power ripple present on AC side. Historically this challenge has been addressed by large electrolytic capacitors. However reliability constraints need for improved system performance have motivated designers seek other capacitor technologies such as ceramic metal film which are frequently used in conjunction with active filtering converters reduce volume required capacitance. Active cycle...

Owing to the need for low power consumption, portable and wearable electronics operate at voltages, typically below 1V, with recent designs in near- subthreshold operation resulting voltages down 0.3 0.5V. Meanwhile, voltage range of most common energy source - Li-ion battery is 3 4.2V, motivating compact converters capable large conversion ratio wide efficient regulation.