The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes an improved partially interleaved structure for high-voltage (Several kV) high-frequency (Several hundred kHz) multiple output applications. Six structures are compared with the leakage inductance, AC capacitance and the rate of AC/DC resistance taken into consideration. The proposed structure features lower leakage inductance, smaller AC capacitance and lower rate of AC-DC resistance,...
On-load tap changer (OLTC) is essential in regulating the operation status of power transformers employed in modern power systems. While exploring power flow analysis, electromagnetic and electromechanical simulations by using the on-load tap changer, it is found that inaccuracy problem may occur with the assumption in conventional transformers that tap positions only affect the turns ratio parameter;...
In the paper is used the Simpowersystems program which is used for calculating the static mechanical characteristic and operating characteristics within the range of variation of rotor slippage. Also, the program can be used to determine the starting moment corresponding to the rotor resistance and reactance values in the startup process. This program does not allow for the modification of rotor parameters...
Passive elements are indispensable in RF systems and are used for matching networks, LC tank circuits, filtering, … etc. Passive elements can be simply classified into distributed elements including transmission lines and waveguides. As the operating frequency moves into the microwave spectrum, the distributed circuits have a higher Q factor, and thus they are usually used for high-frequency applications...
Magnetic coupled resonant wireless power transmission technology has broad prospects for development; this paper takes this as the object of study. Based on the traditional wireless power transmission system, a new three-winding system is proposed. Firstly, the transmission efficiency expressions of two systems and the factors influencing the efficiency are derived. Secondly, based on the chaotic...
Frequency Response Analysis (FRA) has been used as a comparative diagnosis method to explore mechanical defects in transformer. FRA is quite sensitive method and it can be influenced by different factors in transformer simply; however, this sensitivity will make it superior rather than other transformer winding deformation diagnosis techniques. This study has concentrated on tap-changer position influence...
Coil design is one of the critical part to get high power transfer efficiency for wireless power transfer (WPT) system. There exists coil figure of merit (FOM), which is used to evaluate coil design in the aspect of WPT system efficiency. WPT coil FOM is function of coil quality factor (Q-factor) and coupling coefficient, k and higher Q and k guarantees higher coil-to-coil efficiency. Coil DC loss,...
Design and simulation problems of high power full-bridge boost converter with 175…320 VDC supply voltage are considered. The converter under investigation consists of a full-bridge inverter, a boost high-frequency transformer, a diode rectifier connected to a capacitive filter and an active load. Additional inductance, connected in series with the transformers primary winding, is brought in the converters...
This paper presents an investigation into the applicability of a new fractional slot concentrated winding with improved magneto motive force, however with low winding factor for the fundamental wave, for traction machines. For comparison, a common used distributed winding is considered as reference design. Two different synchronous reluctance motors have been designed and analyzed under the same geometric...
To improve the power density of a switching power supply, we attempt to reduce the transformer loss using a magnetoplated wire (MPW). Contrary to using a copper wire, the use of an MPW allows for a reduction of the winding loss component due to the proximity effect. In particular, we investigate the 1-MHz LLC resonant converter using an MPW. A 4.5% decrease in the power loss is achieved, giving 29...
Resonant inductive coupling wireless power transfer (RIC-WPT) is attractive as a convenient power supply method to small mobile apparatus. However, limited size of the receiving coil can limit the efficiency and the power transfer capability. This paper addresses this difficulty by proposing a novel receiving coil structure. The proposed structure has a coil wound on a drum core with a thin axis....
For analysis of power consumption of resistance spot welding systems field-circuit modelling is required. It includes both 2D eddy-current FEA analysis for estimation of the leakage impedance of transformer and P-Spice program for the circuit simulation. It is shown that the design of the transformer influences on the output current and power consumption. We used the equivalent circuit of three-winding...
Due to ever-increasing demand for high-level integration, high system (mechanical) flexibility, small form factor, and/or thermal conductivity, the integrated circuits (ICs) need to be thin, preferably <200µm. One potential drawback of thin IC is that the efficiency of the RF transformer may be degraded, hence resulting in reduced overall system efficiency and increased power dissipation. In this...
In this paper a real-time electrical parameter estimation algorithm of single-phase transformer using Labview - FPGA has beenproposed. In order to estimate the equivalent circuit parameters of a single phase transformer, input and output voltage and currents have been sensed and sampled at a suitable rate. Series winding parameters are recalculated by using differential equation algorithm which uses...
Today, adopters of high power wireless chargers are faced with a dilemma: is the appropriate figure of merit kQ or kra? Wireless Power Transfer, WPT, throughput power is generally taken as the product of the high frequency inverter kVA rating multiplied by a function of kQ, with emphasis on high Q. On the other hand, an optimal matching condition relies on kra, which provides a guide to matching to...
This paper presents a methodology to estimate the parameters of a single-phase induction motor (SPIM) equivalent circuit using a dc test, a locked-rotor test, and a no-load test. By neglecting the core-loss resistance, the SPIM parameters can be first directly calculated using a simplified equivalent circuit. However, an equivalent circuit using the resultant parameter values fail to match the power...
High efficiency power supply solutions for data centers are gaining more attention, in order to minimize the fast growing power demands of such loads, the 48V Voltage Regulator Module (VRM) for powering CPU is a promising solution replacing the legacy 12V VRM by which the bus distribution loss, cost and size can be dramatically minimized. In this paper, a two-stage 48V/12V/1.8V–250W VRM is proposed,...
Abstract Planar spiral windings have garnered a significant amount of attention recently due to the popularity of slim consumer electronics combined with their low-profile, high reproducibility, and simple manufacturing. Unfortunately they still suffer from high internal capacitance which limits their use at high frequencies. This work presents the novel inverse Track-Width-Ratio (TWR) planar structure,...
Inductors are one of the largest and heaviest components of the DC-DC converter in medium/high power applications. As volume/weight of the converter becomes more important, high frequency is considered in the design of the converter and inductors with low inductance and high currents are required. Air-core inductors can be considered as good alternative, since they are not subject to saturation problems...
This paper discusses the potential impact on the reduction of volume and weight of power inductors allowed by the adoption of partial saturation operation. The problem of volume and weight is particularly important in the frame of More/All Electric Aircraft design. It is even more critical in applications like unmanned aircrafts and micro/nano satellites, where very tight specifications are imposed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.