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Multiple-Modular High-Frequency DC Transformer With Parallel …
The direct-current transformer (DCT) plays a key role in bus connection, power transmission, and electrical isolation in medium-voltage (MV) and high-voltage …
Design considerations for very high frequency dc-dc converters
This document describes several aspects relating to the design of dc-dc converters operating at frequencies in the VHF range (30–300 MHz). Design considerations are treated in the context of a dc-dc converter operating at a switching frequency of 100 MHz. Gate drive, rectifier and control designs are explored in detail, and experimental …
DC-DC modular multilevel converter with high frequency …
This paper proposes the design considerations of a high-voltage-high-power dc-dc modular multilevel converter (MMC), which is consist of the half-bridge submodules and an isolation transformer. To adapt the power density requirements of the transportation applications, a modulation method with low switching frequency for …
A PWM strategy dedicated to RMS current reduction in DC link capacitor …
Request PDF | A PWM strategy dedicated to RMS current reduction in DC link capacitor of an embedded three phase inverter | This article presents an extension of the Double ...
High-Frequency-Link-Based Grid-Tied PV System With Small DC-Link Capacitor and Low-Frequency Ripple-Free Maximum Power …
This paper proposes a grid-tied photovoltaic (PV) system consisting of modular current-fed dual-active-bridge (CF-DAB) dc-dc converter with cascaded multilevel inverter. The proposed converter allows a small dc-link capacitor in the three-phase wye-connected PV system; therefore, the system reliability can be improved by replacing …
Why do we use capacitors in parallel with DC motors?
Generally a 0.01~0.1uF capacitor is wired across brushed DC motors to reduce radio frequency EMI caused by arcing between the brushes and commutator. Sometimes two capacitors are wired in series, …
High frequency DC-DC converter using GaN device
This article deals with the conception of a 42V-12V isolated DC-DC converter using new GaN power transistor technology. Those components allow working at higher frequencies compare to classical silicon power components. Thus they allow increasing the power density of converters. Due to their high switching frequency, voltage and current …
Ultra High Voltage Ceramic Capacitors
TDK''s ultra high voltage ceramic capacitors have over 40 years of development and sales history. They are used in various devices such as switches in distribution networks, circuit breakers in substations, and medical and industrial x-ray imaging devices.Due to the use of paraelectric ceramics, they realize stable voltage characteristics, thereby achieving high …
Capacitors in DC Circuits
Capacitors in DC Circuits - Capacitor & CapacitanceWhen any two conducting surfaces are separated by an insulating material, it called as a capacitor. The conducting surfaces are known as plates of the capacitor and the insulating material is known as dielectric.The ability of a capacitor to store charge is termed as capacitan
A low-inductance DC bus capacitor for high power traction motor drive inverters …
For a battery-powered traction motor drive, the inverter DC bus presents high-frequency pulsating current due to device switching. Conventional inverter design sizing DC-bus capacitor based on voltage ripple is no-longer effective. In order to handle high current in a high temperature environment, a low-inductance high-current film capacitor is proposed …
Choosing Inductors and Capacitors for DC/DC Converters
Choosing Inductors and Capacitors for DC/DC Converters . Christophe Vaucourt. ABSTRACT. Wireless handsets, PDAs, and other portable electronic devices continue to …
A low-inductance high-frequency film capacitor for electric vehicles
Current handling capability and frequency response have become the major concerns for the selection of dc bus capacitor in electric vehicle inverter. A low-inductance high-frequency film capacitor is then proposed to replace the conventional electrolytic bulk capacitors. This paper describes the modeling of the PWM AC drive with major parasitic …
The Ultimate Capacitors Guide: Learn How To Use Them
This is your ultimate guide on Capacitors. What they are, how they work, and how to use them in electronics. The best useful equations as well. This way, we can use k as the relative permittivity of our dielectric material times the permittivity of …
Review of very high frequency power converters and related …
With the increasing demand for volume reduction and efficiency improvement, very high frequency (VHF) power converters (30–300 MHz) have attracted great interest. Under such high operating frequency ... As Fig. 1b shown, only one low-side ground-referenced switch is needed in the SEPIC converter. ...
Review of High-Frequency High-Voltage-Conversion-Ratio …
The development of high-frequency power converters is continuously improving their power density, efficiency and fast dynamic response. Among them, high …
A High-Resolution Capacitance-to-Frequency Converter
This paper describes an integrated sampled-data sinusoidal oscillator with AGC amplitude stabilization, the frequency of which is proportional to an external low value capacitor (2-20 pF). The circuit, based on a switched-capacitor two-integrator loop, is insensitive to stray capacitances between sensing nodes and ground and features high resolution (16 bits) …
Murata Electronics High-Frequency Ceramic Capacitors
The GQM/GJM high-frequency ceramic capacitors are the best choice for high performance and high power RF designs requiring voltages up to 500V DC. These capacitors offer EIA sizes 0201, 0402, …
21.6: DC Circuits Containing Resistors and Capacitors
When you use a flash camera, it takes a few seconds to charge the capacitor that powers the flash. The light flash discharges the capacitor in a tiny fraction of a second. Why does charging take … Exercise (PageIndex{1}) When is the potential difference across
A Novel Configuration of DC Link EMI Filter Capacitors in Variable Frequency …
Direct Current (DC) link electro-magnetic interference (EMI) suppression filter capacitors are normally connected between the DC bus positive and negative nodes to the Earth node in variable frequency drives (VFDs) to minimize voltage overshoots from power device switching action as well as to suppress the electromagnetic interference (EMI) generated …
Introduction to Capacitors and Capacitance | Basic Direct Current (DC…
2. DC-DC Converter Output Filtering: Capacitors are used to filter out the high frequency switching noise generated in DC-DC converters. 3. Coupling: Capacitors are used to couple two circuits together, allowing AC signals to pass while blocking DC signals. 6.
Fast-transient techniques for high-frequency DC–DC converters
In Ref. [], an emulated AC+DC current sensor is proposed to accommodate immediate responses to load changes, but the implementation is complicated. In Ref. [], a …
DC-Link Capacitors RMS Current Reduction PWM Method Based High Frequency SiC Three-Phase Inverter …
In this paper a novel pulse-width-modulation (PWM) method is proposed for Silicon Carbide (SiC) based on high frequency three-phase, two-level, voltage-source inverters (VSIs) aiming at reducing the RMS current flowing through DC-link capacitors. Mathematical analysis shows that this new strategy is particularly effective in terms of reducing DC-link …
WeA3-1 : Design Considerations for Very High Frequency dc-dc …
This paper introduces circuit designs and methods suit-able for dc-dc converters operating at very high frequencies (VHF, 30-300 MHz). These developments are introduced in the …