TY - GEN
T1 - Quasi-resonant flyback converter with new valley voltage detection mechanism
AU - Wu, Wei Chia
AU - Liang, Tsorng Juu
AU - Chen, Kai Hui
AU - Li, Cheng Yuan
PY - 2018/4/18
Y1 - 2018/4/18
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85046945888&partnerID=8YFLogxK
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U2 - 10.1109/APEC.2018.8341098
DO - 10.1109/APEC.2018.8341098
M3 - Conference contribution
AN - SCOPUS:85046945888
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 767
EP - 770
BT - APEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
Y2 - 4 March 2018 through 8 March 2018
ER -