Sheng-Fu Hsiao

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This paper presents the interpole-type magnetic actuator for navigation of magnetic drug. In the proposed magnetic actuator system, the magnetic actuator generates the magnetic field to magnetize the magnetic drug, and then the magnetic force is induced on the magnetic drug. However, the magnetic force is enhanced by increasing the phase current. Therefore,(More)
A constant on-time (COT) controller for dc converters has received much attention recently because of its unique feature of high light-load conversion efficiency. In this paper, a control model is developed for the boost converters with the current-mode COT controller. Models are developed for predicting the loop stability and the step-load transient(More)
In recent years, LEDs have been increasingly used for back-light illumination for high-performance digital television applications. This is usually a wide-screen TV application in which array-connected LED strings and boost converter configuration are used, and dimming capability is a necessity. In such a control scheme, the LED current is precisely(More)
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