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.
The paper reviews new power saving and efficiency regulations applied to server and telecom power supplies. It discusses aspects of system architectures with AC and DC uninterruptible bus on facility level, and then focuses on zero-voltage switching (ZVS), phase-shifted full-bridge DC/DC converter as a good candidate in such applications. The paper describes a new control strategy demonstrating power...
The paper presents and analyzes the efficiency of a 150 W LLC resonant converter in order to compare with the results obtained with a conventional 150 W flyback version. The experimental results of the LLC resonant converter show a maximum efficiency of 94%, and an efficiency of 92% under a full-load condition. Using the presented theoretical equations and design methods, the power losses of the LLC...
This paper presents a method to improve the efficiency of a standard asymmetric half-bridge converter for 3 phase, 12/8 switched reluctance motor (SRM) drives at low speed operation. At that speed range, the SRM converter operates mainly in current chopping modes either hard chopping or soft chopping control. This work emphasizes on minimizing the main power losses during the turn-off interval of...
This paper discusses the importance of a simulation study of the Taiwan Electrical Fuel Cell Power Scooter. This study applies a more detailed modeling which is complex as existing modeling methods, yet not more difficult to solve numerically. In most simulation studies, the influence of non-linearity (for example, saturation, losses, reluctance effects) of the power electronics and electrical machine...
Inserting an auxiliary switch to the conventional hard-switch full-bridge topology, a novel soft-switching full-bridge converter is proposed. Instead of the main switches, the auxiliary switch is pulse-width modulated to regulate the output voltage and soft-switching operation of the main switches can be easily achieved over full line and load ranges. Consequently, the reduced switching losses can...
It has been shown that the resolution of DPWM can be dramatically increased by either constant on-time modulation or constant off-time modulation as compared to that for constant frequency modulation. However, the switching frequency increases dramatically for constant on/off-time modulation method under heavy/light load conditions. The objective of this paper is to propose a hybrid control technique...
New bridgeless single phase AC-DC power factor correction (PFC) rectifiers based on Sepic and Cuk topologies are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle results in less conduction losses and improved thermal management compared to the conventional Sepic and Cuk PFC converters. The proposed...
In this paper, based on generalized zero vector a novel simple PWM control circuit for a three-phase inverter is presented. The proposed control circuit, consists of a simple analog circuit to achieve function of DPWM (Discontinuous Pulse Width Modulation), has several advantages such as lower switching losses, higher efficiency and voltage usage utility, pure sinusoidal output and cost down etc....
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.