Developments and Applications of Flyback Converter

[[abstract]]本論文主要目的為對返馳式轉換器作分析與探討，並將返馳式轉換器應用於直流-直流、交流-直流、功率因數修正、電子點火系統上。應用直流-直流電能轉換時，實際研製一100W的返馳式轉換器，以閉迴路控制方式，穩定輸出電壓。在交流-直流的應用上，則研製一多輸出的小型電源供應器，其體積小，能穩定提供四組直流電壓。此外，功率因數修正的應用上，以單週期控制機制，來實現功率因數修正的功能，並實際研製一台80W的功因修正器，來驅動LED陣列。將返馳式電路應用於電子點火器，藉以提升燃料的燃燒效率、降低油耗，達到節能減碳之目的，點火器以微處理器為控制核心，因此，在體積、硬體元件數、控制彈性上均具優勢。論文中，將以實測波形與數據，來驗證各種轉換器的可行性與功能性。[[abstract]]The purpose of this thesis is to study flyback converter and then, applying this type of converter to design dc/dc converter, dc power supply, power factor corrector (PFC), and engine electronic igniter. In dc/dc converter application, a 100W flyback-type converter is implemented with closed-loop control to regulate output voltage. To serve as a dc power supply, flyback-type converter is adopted and designed to provide four different voltages for low power applications. Based on one-cycle control, the flyback-type converter is also developed for power factor correcting. In this thesis an 80W one-cycle-controlled PFC prototype is built to drive LED arrays. For vehicle application, the structure of flyback-type converter is modified and applied to engine electronic igniter, which can promote combustion efficiency, save oil consumption, fuel efficiency and CO2 reduction. The control core of the electronic igniter is implemented on a single chip to lower discrete component count, reduce volume, and increase control flexibility. Hardware waveforms and practical measurements have verified the feasibilities and functionalities of the all designed converters in this thesis