271 research outputs found
Clock pulse modulation for ripple reduction in buck-converter circuits
DC-DC switching converters which are frequently treated as hybrid dynamical systems exhibit complex behavior due to nonlinear and interrupt characteristics. For synchronous buck-converters, we propose a method to control chaotic behavior by pulse-frequency modulation. An input voltage, a duty ratio of PWMs, and so on, affect to the regulation characteristics of converters directly, but a frequency of PWMs is determined by the frequency characteristics of the converter and is set as a fixed value. The proposed chaos-control method suppresses chaotic responses by slightly perturbing the pulse frequency alone, therefore our method can stabilize unstable periodic orbits without influence on the voltage regulation scheme. To simplify the feedback controller, the condition of dimension reduction for the controlling gain vector is derived. The proposed controller acheves the stabilization without a current sensor. Numerical simulation and circuit implementation demonstrate the validity of this method
Studies on the grading of fruit maturity by specific gravity in the determinate varieties of processing tomatoes : (I) Changes of specific gravity with advances of fruit maturity
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Storage of Bananas Packed in Polyethylene Bags
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Effects of Accelerated or Delayed Ripening on Hardness, Sugar Content and Acidity of Bananas
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Vibrating Acceleration of Cartons in the Truck Transport of Fruits
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Ripening Characteristics of 'Latundan' Bananas (Musa AAB group) Imported from the Philippines
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