Quasi-resonant flyback converter with new valley voltage detection mechanism
| Autor: | Wei-Chia Wu, Cheng-Yuan Li, Tsorng-Juu Liang, Kai-Hui Chen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
business.industry
Computer science Flyback converter 020208 electrical & electronic engineering 05 social sciences Detector Electrical engineering Process (computing) High voltage 02 engineering and technology Power (physics) CMOS Control theory Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering 0501 psychology and cognitive sciences business 050107 human factors Voltage |
| Zdroj: | 2018 IEEE Applied Power Electronics Conference and Exposition (APEC). |
| Popis: | In quasi-resonant (QR) controller, sensing the current of the power switch and using a delay time are commonly used to achieve valley-voltage-switching. However, the accuracy of valley-voltage switching instant in both methods are affected by the components variations during manufacturing. A primary-side QR-control IC for flyback converter with a novel valley detector is proposed to solve this problem. By sensing the auxiliary winding voltage, the controller estimates the quarter of the resonant period. And the time which the voltage across the power switch decreasing to valley is estimated accurately. Additionally, the primary-side control is adopted to reduce the size and cost of circuit. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed-signal general purpose process, and applied to an input voltage of 90–264 Vrms, output voltage of 12 V, and output power of 30 W flyback converter to verify the feasibility of proposed control. |
| Databáze: | OpenAIRE |
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