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 interleaved flyback converter which is remarked with zero-voltage-switched active switches and reduced reverse recovery loss on the rectifying diodes. The configuration is composed of two identical flyback converters and an auxiliary inductor shunted between the diodes. This converter can provide up to 500 W power with highest efficiency as high as 91%.
The life time of lighting emitting diode (LED) can reach 100,000 hours. Compared to other power supplies, the power supply for LED requires long life time in addition to high efficiency and high power factor. Electrolytic capacitor has the shortest life in switching power supplies. In order to prolong the life time of power supply, it is necessary to reduce the storage capacitance and use other kind...
It is well known that there exist second-order harmonic current and corresponding ripple voltage on dc bus for single phase PWM rectifiers. The low frequency harmonic current is normally filtered using a bulk capacitor in the bus which results in low power density. This paper studies the energy storage capacitor reduction methods for single phase rectifiers. The minimum ripple energy storage requirement...
State-of-the-art low voltage (LV) medium and high power variable speed drives are voltage source converters. Frequently, frond-end stage is a diode rectifier. To reduce the amount of input current harmonics multi-pulse rectifiers are used. Due to the high cost of active front-end and the specific transformer requirements of multi-pulse rectification, alternative harmonic filtering solutions are sought...
The quick equalization technology of ultra-capacitor stacks in series can protect ultra-capacitors and make full use of limited capacitance. Ultra-capacitorpsilas high specific power and charging current require a higher equalization speed. Therefore a method related with buck-boost conversion for switched capacitorspsila equalization was developed. The design method for circuit parameters and corresponding...
A new two-stage buck topology for voltage regulators (VRs) is proposed in this paper. Continuous input current, intermediate bus current and output current can be achieved without intermediate bus capacitor. Good stability of the cascade converter and better transient response than conventional buck converter can also be achieved. Detailed theoretical analyses have been presented. A 1 V/25 A experimental...
Remarkable progresses have been made over the past decade in power conversion technologies, including advanced power semiconductor devices, power management ICs, innovative circuit topologies, and packaging and integrated system solutions. These technological advancements have been manifested in a wide range of products and applications with ever increasing performances, efficiency, and power density...
A primary source of common-mode (CM) electromagnetic interference (EMI) in high frequency switching converters is the parasitic capacitance between switching element and its heat sink. A passive method for cancellation of CM-EMI is analyzed in detail in this paper. Compared to with active cancellation techniques, it is much simpler and requires no additional switches or semiconductor components. The...
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.