| Summary: | 碩士 === 明新科技大學 === 電機工程研究所 === 98 === The goal of this thesis is to develop an integrated power supply with high efficiency and low cost by adopting power factor corrector and full-bridge inverter for the requirements of large-sized LCD TV.
The full-bridge inverter takes the OZ964 manufactured by O2Micro as the control IC, which uses the mode of Phase-Shift PWM Controller for dimming. So it can improve the thermometer effect caused by traditional dimming methods and obtain a wider dimming range. Besides, with Soft Start design, the full-bridge inverter can effectively prevent the lighting tube from rapid blackening which may shorten its life, and has low standby power consumption and other advantages. The output voltage of the half-bridge inverter is only a half of the input voltage, while the push-pull type inverter can output such square wave voltage as high as the input voltage. Meanwhile, the switching elements must bear more than double of the withstand voltage. Therefore, the full-bridge style design is adopted for retaining the advantages of the half bridge type and the push-pull type to provide higher output voltage and enable the switching elements to use lower withstand voltage.
This paper aims to manufacture an integrated power supply according to the design specifications and expounds the design and measurement results of the circuit. Besides the requirements such as high power and high quality, circuit design also takes the cost into consideration, with the expectation to design the functions that meet the requirements at lowest cost. Meanwhile, the analysis and discussion in this paper may lay the foundation for future development.
Final results show that this design framework can not only reduce the cost, but also greatly increase the whole efficiency. The experimental data is also further verified to confirm the stability of the product. In addition, the design framework is compared with the traditional power supply to confirm the difference.
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