The synchronous buck circuit is in widespread use to provide “point of use” high current, low voltage power for CPU’s, chipsets, peripherals etc. In the synchronous buck converter, the power stage has a “high-side” (Q1 below) MOSFET to charge the inductor, and a “Low-side” MOSFET which replaces a conventional buck regulator’s “catch diode” to provide a low-loss recirculation path for the induct...

Previous vehicle-to-pedestrian simulations and experiments using pedestrian dummies and cadavers have shown that factors such as vehicle shape, pedestrian anthropometry and pre-impact conditions influence pedestrian kinematics and injury mechanisms. Generic pedestrian bucks, that approximate the geometrical and stiffness properties of current vehicles, would be useful in studying the influence ...

The synchronous buck circuit is in widespread use to provide “point of use” high current, low voltage power for CPU’s, chipsets, peripherals etc. In the synchronous buck converter, the power stage has a “high-side” (Q1 below) MOSFET to charge the inductor, and a “Low-side” MOSFET which replaces a conventional buck regulator’s “catch diode” to provide a low-loss recirculation path for the induct...

– A buck converter controlled by naturally-sampled constant frequency pulsewidth modulation in continuous mode of operation is analysed. For a fixed set of converter parameters and varying the dc supply voltage only the buck converter can be driven into chaos through a process of period doublings. A good agreement between simulation and experiments is obtained. Key-words: buck converter , ident...

An epidemiological survey of haemoparasitic infection in trade cattle was carried out at Lafenwa abattoir, Abeokuta, from August to November 2008. Thin Blood film and Haematocrit Centrifugation Techniques were used detect haemoparasites. A total 452 that comprised 174 cows 278 bulls examined. The breeds included 78 'Red Bororo', 14 'Sokoto Gudali' 360 'White Fulani'. Packed cell volume (PCV), r...

1 This work is supported by Philips Research, Briarcliff Manor, NY, through Colorado Power Electronics Center Abstract – Single-switch step-up/step-down converters, such as the buck-boost, SEPIC and Cuk, have relatively high voltage and current stresses on components compared to the buck or the boost converter. A buck-boost converter with two independently controlled switches can work as a boos...

This paper presents an integrated power factor correction (PFC) buck-boost buck converter based voltage source inverter (VSI) fed brushless DC motor (BLDC) drive using a single voltage sensor. The speed is controlled by controlling the DC bus voltage of the VSI. An electronic commutation of the BLDC motor is used which utilizes a fundamental frequency switching (FFS) of VSI which in-turn offers...

1 Department of Haematology and Blood Transfusion Science, Faculty of Medical Laboratory Science, Usmanu Danfodiyo University, Sokoto, Sokoto State, Nigeria. 2 Department of Obstetrics and Gynecology Usmanu Danfodiyo University Teaching Hospital, Sokoto. *Corresponding Author’s E-mail: [email protected] It has been figured that sometime this fall, the world’s population will reach 7 billion peo...

BACKGROUND Maternal mortality ratio and infant mortality rate are as high as 1,576 per 100,000 live births and 78 per 1,000 live births, respectively, in Nigeria's northwestern region, where Sokoto State is located. Using applicable monitoring indicators for tracking progress in the UN/WHO framework on continuum of maternal, newborn, and child health care, this study evaluated the progress of S...