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Light emitting diode (LED) lights are becoming more popular nowadays due to their advantages such as low cost, design flexibility and environmental friendliness. Piezoelectric transformer (PT) is suitable to drive LED because it reduces its overall size, component count and cost. Advantage of PT is that it has no electromagnetic interference as compared to conventional electromagnetic transformer...
This paper proposes a new resonant circuit enhanced with a new tracking control approach for a piezoelectric transformer-based LED lighting system. In this method, the LED driver architecture features full bridge phase shift converter with C-L-C series-resonant circuit along with the piezoelectric transformer. Then, the concept of tracking control is well designated into the FPGA controller such that...
A comparison of inductor-half-bridge (IHB) and class-e (CLE) resonant converters using piezoelectric transformer (PT) is presented in this paper. The analysis approach is based on state space normalized solutions which allows precise analyzing and comparing the two topologies for different applications with mathematics software. The obtained mathematic results can be directly used to design and to...
An up to 5 Watts wide range power supply LED driver demonstrator with a piezoelectric transformer (PT) has been built to show the static and dynamic behavior as an off-line power supply. The target of the power converter controller using a PT, with 2.3 mm thickness and 17 mm diameter at frequency of 155-175 kHz, designed in a resonant circuit of class-E topology, is to maintain a constant output current...
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