| Summary: | 碩士 === 明新科技大學 === 電機工程研究所 === 96 === This thesis aims to explore the study and design of a fully bridged converter in order to generate a high-power and low-cost dimmable electronic ballast for larger-size TFT monitor.
A full bridged inverter, which uses Phase-Shift PWM dimmable controller, adopts a OZ964 IC controller generated by Micro which is better than traditional ways in order to improve the effectiveness of the thermometer and get a wider dimmable range. Moreover, the design of soft starter, has the advantages of low stand-by power consumption, and can decrease Tube-Blacking quickly to gain a longer tube life. Because the output voltage of half bridged inverter is only one half of input voltage, and the output voltage of push-pull inverter is equal to the input voltage, switch components for push-pull inverter should uphold the impact of more than twice of the input voltage. Therefore, with higher output voltage and lower impact, we choose a full bridged inverter to combine the advantages of these two inverters.
This thesis is based on our new specifications to design and implement dimmable ballast and it is not only explains the ballast circuit functions in detail but also measures the circuit performances. In addition to high power efficiency and high quality, our circuit design also took cost into account which fulfills the function of needs. Finally, we analyze the results and present suggestions as a foundation for future possibilities.
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