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Light emmiting diode (LED) lighting is becoming more and more popular in both commercial and residential lighting system for its energy-efficiency and environmental-friendly merits. For high end lighting system, dimming and color control are always required, which are known as smart lighting. In this paper, a cost-effective power factor corrected (PFC) flyback pre-regulator is presented for smart...
A novel high efficiency transformer-based flyback dc-dc converter with maximum power point tracking (MPPT) and zero current switching (ZCS) control is proposed in this paper. By adding a new primary side, the transformer works in flyback mode and the ordinary n-well process is used rather than twin-well. The startup process is divided into two modes: oscillation mode and constant duty-cycle flyback...
This paper presents a boost converter used to harvest photovoltaic energy, one of the most important renewable energy sources, and to converter it into a power supply for micro power devices. To meet the low power requirements of applications such as wireless sensor network, the converter is designed to work at burst-mode to reduce power consumption. And a simple Maximum Power Point Tracking (MPPT)...
Aiming to SoC (System-on-Chip) power supply in portable devices, a high-conversion-ratio buck regulator is proposed. The operation duty cycle is expanded to 100% due to the emulated current mode. The 2.5 V to 4.5 V input voltage range makes it ideally suited for single cell Li-Ion battery supplied devices. The range of output voltage is from 1.2 V to input voltage accord to different kinds of SoC...
In this paper, a high dimming ratio LED drive controller without color shift issue was proposed, fabricated and tested. It is composed of a boost power stage and some dimming control circuits. To fit high ratio dimming, it is necessary for the power stage to have fast enough transient response during the LED load switching. Therefore, a constant on time (COT) controlled boost converter was proposed...
The software codec on mobile device introduces significant power consumption because the energy efficiency of general processor based system is much lower than that of the dedicated hardware such as ASIC based accelerator. Dynamical voltage scaling (DVS) is one of the most efficient techniques to promote the energy efficiency. Most existing papers on this topic use simple heuristics to predict processor...
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