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.
B-SIT has an advantage that its on-resistance is extremely low compared to those of other power semiconductor switching devices. Accordingly, we can suppress its conduction losses during large current operation. Then, high conversion efficiency is expected when B-SITs are utilized as the switching devices of high frequency inverters. Here, we adopt newly developed B-SITs which have the maximum ratings...
The paper proposes a new topology for multiple outputs DC supplies allowing for implementation of commercial low power AC/DC converters. A special attention is paid to supplying mixed analogue/digital circuits that give rise to permissive voltage deviations when discontinuous load currents are applied. To avoid this problem, the paper is particularly concerned with the back-end requirements of the...
The contact less energy transfer requires a transformer with air-gap. So organized transformer suffer with the no-negligible leakage inductance. When hard switching principle has been used the undesirable high surge voltage appears on the semiconductor elements. This paper treats the 500 W AC-DC converter based on HF-AC resonant link circuit in order to avoid the high surge voltage problems
In this paper a new snubber circuit design for three-level inverter will be presented. The so-called "dual snubber circuit" still comprises most of the positive features as a low number of components, improved efficiency due to the low snubber element and power semiconductor losses, reduced over-voltage across the semiconductor devices and no balancing problems. With these advantages, the...
In recent years, power electronic energy storage systems using super capacitor bank have been widely studied and developed for the electronic vehicles. In this paper, a full-bridge/centertapped push-pull circuit-based bidirectional DC-DC converter and its control method are proposed and discussed. From the results of detailed experimental demonstration, the proposed system is able to perform adequate...
The paper presents practical investigations of DC/DC multilevel, multicell converter with DSP/CPLD control. A flying capacitors topology, natural balancing process and method of control of three-cell DC/DC converter are presented. Practical realization of the controller with use of programmable logic, discrete regulators in signal processor, procedures of initial flying capacitors charging, protection...
This paper deals with estimation of losses and efficiency of switched reluctance motor (SRM), which is supplied from converter and motor is working under load conditions with different torques and at different speeds. The losses in a SRM consist mainly of stator winding losses and core losses. The winding losses are proportional to the square of the r.m.s current whereas the core losses are function...
A haptic system consists in an articulated mechanical structure with motors and position sensors, as well as embedded electronics allowing force feedback. It is driven by a haptic interface, which enables the user to interact with an image in a virtual reality application, through the sense of touch. This paper presents a simple identification protocol using inverse models and least-squares techniques...
The design of synchronous multiphase DC-DC converters allows improvements of the characteristics of high power systems. The automotive industry forecast that future power demands inside a car will oscillate between 2.5 kW and 3.5 kW, keeping a dual system of 42/14 V batteries. In this paper, an optimal fuzzy controller has been developed to control a synchronous multiphase converter of 1.6 kW for...
For reduction of the switching power losses developer of three-phase inverters thinks increasingly about discontinuous modulation strategies. This applies in particular for high power inverters such as for starter generator-or hybrid drive systems. The DC-link current of these discontinuous modulated voltage source inverter are analyzed in this paper. First the DC- and the rms-current of the DC-link...
This paper describes a method to identify and assess power loss mechanisms in power MOSFETs for switched circuits. An accurate behavioural MOSFET model is employed in a circuit simulator to analyse the performance of a trench MOSFET technology. A synchronous buck converter for point of load (PoL) applications underlies the study of MOSFETs' switching behaviour. The methodology aims at the derivation...
The paper investigates the effects of EMI filter in the dynamics of a buck converter. It is shown theoretically that the EMI filter may increase significantly the load sensitivity of the voltage-mode-controlled converter but the peak-current-mode-controlled converter is quite insensitive to the EMI filter interactions. Experimental validations are carried out using a buck converter under three different...
Operation regimes of modern power semiconductor devices (such as IGCT thyristors or IGBT transistors) are characterized by switching high currents of the order of kA at the voltage level of several kV. Although their internal and eventual contact resistances are very low, the Joule losses in them reach quite high values and corresponding heat may lead to unacceptable (local or global) temperature...
The global electrical energy consumption is still rising and there is a steady demand to increase the power capacity. It is expected that it has to be doubled within 20 years. The production, distribution and use of the energy should be as technological efficient as possible and incentives to save energy at the end-user should also be set up. Deregulation of energy has lowered the investment in larger...
A large number of distributed generation (DG) units are being integrated into power systems at distribution level. The DG units play an essential role in affecting the efficiency and performance of power systems. This paper describes some possible controlling modes of DG units. The operation and control of the power systems consisting of DG units, in particular separated subsystems, are discussed...
A smoothed-power output topology for battery of stand-alone renewable power system (SARPS) using EDLC (electric double layer capacitor) is presented. To prolong the service life of battery, decrease maintenance cost and power loss of SARPS by realizing smoothed-power output supply, an EDLC is paralleled with battery as a part of storage system, and connected by a bi-directional buck/boost compensation...
The permanent magnet linear servo system has some advantages of high speed, high response and direct drive, but the servo performance is influenced by the load disturbances, end-effects, nonlinear friction and the parameters variations. In order to eliminate the influences of the above-mentioned uncertain factors on the basis of ensuring better tracking performance, a robust tracking control strategy...
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator active and reactive power, which is based on the condition of the system operation for not only the extracted...
For supplying adequate driven force with high operational precision in semiconductor manufacturing industry, construction of a low cost device that can be integrated with the micro-electromechanical system (MEMS) fabrication scheme has been investigated. With both the degraded material property after electroplating process and the geometric constraints of MEMS constructions being considered, magnetic...
This paper investigated the reactive power increase when the cage rotor induction machine is connected to the utility system through the full rating VSC link system. The calculation using equivalent circuit indicates that the increase in the reactive power consumption may be suppressed by the decrease in the reactive power consumption of the secondary circuit. The combination of the cage rotor induction...
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.