| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 88 === Due to the limited resources on earth, saving each kind of energy resource has become the most important thing in the world. And because of the quick development of economy, the proportion of illumination in Taiwan have been over 20%. As a result, how to improve the efficiency of man-made illuminants which we have today should be the main topic.
The purpose of this thesis is to design a electronic ballast that is low-cost and fine-property, by using a single stage and a single switch. The whole circuit consists of an electromagnetic interference filter, a bridge rectifier, a class-E frequency converter active power factor correction circuit, and a series-resonant parallel-loaded inverter. Among four parts mentioned above, in order to lowering cost and making overhauls be more convenient, the class-E frequency converter active power factor correction circuit and the series-resonant parallel-loaded inverter is integrated into a single stage, and use a single switch witch is implemented by a power MOSFET.
After understanding the operational theory on each part of the circuit and inferring the criterion which is needed for designing, we have proceeded an actual example as verification ── First, we selected basic values of every parameter. Then, we used OrCAD PSpice to model the operation of IC L6560 so we could correct the related parameters. At last, the example indeed showed the similar waveform and results with simulation: the operating frequency of the switch was about 25 kHz, the power factor was about 0.98, the crest factor of the lamp current was 1.58, the efficiency was able to reach 84% ── From this example, we know the electronic ballast is practicable , on the other hand, because only one single power MOSFET is used, the cost is much lower than two-stages and single-stage two-switchs ones.
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