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.
Due to a series of unique merits, Modular Multilevel Converters (MMCs) have been developing dramatically in the last decade. However in some applications like offshore power transmission the MMC modules are subjected to a variety of tough temperature profiles with adverse working condition, all of these could lead to thermo-mechanical fatigues in the components and joints of the power modules and...
In this paper, an efficiency comparison of neutral-point-clamped (NPC) inverters and bipolar switch NPC (T-Type) inverters is studied and the result shows that the T-Type inverter is more efficient at lower switching frequencies. Nevertheless, its efficiency suffers when the switching frequency increases due to high switching loss of the equipped high voltage power switches. In order to reduce switching...
LLC resonant converter is an attractive topology to achieve high power density with high efficiency. However, the high switching frequency and circulating current result the poor efficiency of a LLC resonant converter under light load condition. To improve efficiency further, a modified burst-mode control is implemented in the proposed controller. The switching frequency decreases gradually during...
This paper proposes an AC-AC converter, which consists of T-type three-level rectifier and inverter, for an on-line UPS. The switching loss of the proposed AC-AC converter is drastically reduced because the proposed converter is driven at a very low switching frequency which is six times of input side frequency. The T-type rectifier separates the maximum phase-voltage, medium phase-voltage and minimum...
IPT technology has been increasingly used in EV charging systems. However, fast charging using IPT technology is still a concern due to high-power high-frequency operation. This paper presents a low cost modified MOSFET-IGBT multi-level converter that is suitable for high power and high frequency IPT systems. The proposed converter with a reduced number of switches can be employed on both sides of...
An active snubber cell and its dual circuit for reducing switching losses of 1 to N phase dc-dc converters is presented. Main switch(s) of the converter can be turned-on and - off at zero-voltage (ZV); auxiliary switch of the proposed snubber cell can be turned-on at zero-current (ZC) and turned-off at ZV. There are no extra current and voltage stresses will be introduced on the main switch and the...
As the increase of large-scale distributed generation system, the interest in the efficiency of the inverter has been higher. In this paper, the power losses are classified and calculated according to the switching states of the three level NPC inverter and three level T-type inverter. And they are compared with the results from the PSiM thermal module simulation. These power loss comparisons are...
This paper presents the loss performance analysis of an isolated power supply that is designed for ultra-fast tracking converters. The results of the analysis provide insights into the operation of the proposed power supply, how each physical component contributes to the total loss, and how its efficiency may be further improved.
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.