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The need for efficient, smaller, lighter and cheaper power supply units drive the investigation of using high switching frequency soft switching resonant converters. This work presents an 88% efficient 48V nominal input converter switching at 6 MHz and output power of 21 Watts achieving power density of 7 W/cm3 for Power-over-Ethernet LED lighting applications. The switching frequency is used to control...
Increasing the switching frequency for switch mode power supplies is one of methods to achieve smaller, lighter weight and cheaper power converters. This work investigates the opportunity of using two layer circular spiral inductors implemented in a 150 µm finished thickness printed circuit board for a high frequency DC-DC converter. The inductor was tested in a 5 W buck converter switching at 10...
An increased attention has been detected to develop smaller and lighter high voltage power converters in the range of 50V to 400V domain. The main applications for these converters are mainly focused for Power over Ethernet (PoE), LED lighting and AC adapters. This work will discuss a study of using enhancement mode gallium nitride switches to form a 50V quasi-square-wave zero-voltage-switching buck...
In order to achieve tiny point of load converters, higher switching frequencies should be used to minimize the magnetic component sizes and enable the integration process. High frequency hard switching buck converters dissipate a lot of power due to the high switching losses. This paper discusses the utilization of Quasi-Square Wave Zero Voltage Switching (QSW-ZVS) integrated buck converter with adaptive...
Thyroglossal duct cysts are the most common cause of midline congenital cyst formation in the neck that may present at any age. Classically, it presents as an anterior midline neck swelling that moves with deglutition and protrusion of the tongue. Occasionally, thyroglossal duct cyst presents in atypical manner either clinically or radiologically, which may pose a diagnostic challenge.The aim of this...
In this paper, a very high switching frequency Point of Load (POL) buck converter is proposed. The main feature of the proposed converter is small footprint, high efficiency, very low output ripple and excellent transient response. These superior features enable the replacement process of the inefficient LDO in many battery powered applications. The improved transient response has been achieved through...
This paper proposes an integrated, high switching frequency, zero-voltage-switching quasi-square-wave (ZVS-QSW) point of load (POL) buck converter for portable applications. The design and analysis of a fully integrated synchronous buck dc-dc converter with integrated inductor is presented. The converter has been optimized to convert 5V input voltage to 1.2V at 3A maximum load current at a 5MHz switching...
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