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In this paper, a fully digitalized current sharing strategy without any analog-to-digital converter (ADC) is presented and applied to light-emitting diode (LED) lighting. By doing so, the cost for digital control is reduced significantly due to no ADC used. Aside from this, LED dimming is easy to realize. Above all, the proposed current sharing method has the capability of resisting variations in input voltage and component parameter. Such a control topology is demonstrated by some experiments and hence is very suitable for LED street lighting. [ABSTRACT FROM AUTHOR]

A multifunction circuit is presented herein and applied to a synchronously rectified flyback converter, with the circuit not only playing the role of an LC snubber but also detecting the zero crossing of the current to reduce switching loss and feeding the peripheral circuit. Hence, such a converter has high efficiency all over the operating range and, together with one front-end power-factor-correction ac–dc converter, is applied to feeding a LED streetlight. In this paper, the basic operating principles of the proposed topology are first illustrated in detail, and second, some simulated and experimental results are provided to demonstrate the effectiveness of the proposed topology. [ABSTRACT FROM AUTHOR]

In this paper, a simple dimming control is presented and applied to a cold cathode fluorescent lamp (CCFL). Traditionally, the digital dimming takes back-and-fro start and cutoff of the CCFL, thereby causing current spike and hence reducing the life of the CCFL. Consequently, to overcome these problems, a dimming strategy is presented according to the frequency shift. Moreover, a full-bridge phase-shift resonant inverter is utilized to power the CCFL. Some experimental results are provided to demonstrate the effectiveness of the proposed scheme. [ABSTRACT FROM PUBLISHER]

This paper presents three types of low-side gate drivers to drive n-channel power metal--oxide-semiconductor field-effect transistors (MOSFETs). Most important of all, each gate driver has a single positive-voltage source fed, and any one of these three types is used according to applications. In addition, the main purpose of the proposed gate drivers is to reduce the losses created from power MOSFETs. In this paper, the detailed operating principles of the proposed gate drivers are illustrated, along with some experimental results provided to verify the feasibility of the proposed topologies. [ABSTRACT FROM AUTHOR]