Fabio Bisogno

Learn More
This paper deals with the thermal characteristics of the <i>I</i> -<i>V</i> curve of GaN-based white light-emitting diodes (LEDs), focused on the variations of the dynamic resistance. The final goal of this study is to improve the static and dynamic operations of the LED driver within a wide range of temperatures. Four LEDs from different manufacturers were(More)
This paper presents an adaptive universal control IC with error protection functions for high loaded factor (Q&#x003E;5) resonant converters as in Piezo-Transformer (PT) applications. It has wide frequency tuning range from 25 to 500 kHz. Duty cycle (Dc) tracking and synchronization (SY) are included to ensure Zero Voltage Switching (ZVS) and to extend the(More)
This paper presents a comparative analysis of dimmable self-oscillating electronic ballast for fluorescent lamps. A review of general dimming methods presented in the literature is performed. A general analysis of each dimming method is made, and the operation with power factor correction was considered in order to evaluate the characteristic of each(More)
Design for specific customer service plays a crucial role for the majority of the market in modern electronics. However, adaptability to an individual customer results in increasing design costs. A key to manage these opposite requirements is a wide application of computer aided design tools for multi-objective optimisation of existing IP blocks. In this(More)
This paper presents an electronic ballast to operate HO fluorescent lamps with power ratings of 24 W, 39 W and 49 W. The proposed circuit detects the lamp type by its operation voltage and sets duty cycle of the power factor correction circuit to adequate the output power. Experimental results are shown to demonstrate the feasibility of the proposed(More)
This paper presents a simple alternative of automatic luminous control for electronic ballasts operating in selfsustained oscillating mode feeding fluorescent lamps to energy saving. The luminous flux level control is based on a signal from a lighting dependent resistor, which measures the luminous flux level. The dimming feature is obtained using switching(More)
This paper presents an analysis and design of a Light Emitting Diode (LED) driver aiming to eliminate/substitute the electrolytic capacitors. Considering the low lifetime of electrolytic capacitors compared to LEDs, this topology aims for reducing the storage capacitance and replaces it by a film capacitor, increasing the system lifetime. This reduction is(More)