Due to the rapid development of consumer electronics, the demand for power adapters is increasing. Therefore, a high-precision, high-reliability, low-cost flyback AC-DC converter without auxiliary winding was proposed in this paper. The converter adopted a primary-side regulation (PSR) topology to s...
Due to the rapid development of consumer electronics, the demand for power adapters is increasing. Therefore, a high-precision, high-reliability, low-cost flyback AC-DC converter without auxiliary winding was proposed in this paper. The converter adopted a primary-side regulation (PSR) topology to sample the output voltage and current from the primary inductor, and adjusted the switching frequency to achieve a constant output voltage. By alternately switching the main power BJT and the auxiliary MOSFET, with the advantage of the base charge storage effect, the chip was powered by the primary-side current. A primary-side sampling resistor was placed at the negative terminal of the ground potential of the chip, which approached real-time monitoring of the primary-side current. This improved the reliability and output accuracy of the system. To verify the feasibility and performance of the proposed circuit, an IC controller was designed and fabricated under the NEC 1 ㎛ BCD process. Experimental result showed that deviations of the output voltage and current do not exceed±1.4% and±2.3%, respectively. These results also showed that the maximum conversion efficiency can reach a level of 78.7%, which satisfies the consumer market very well.
Due to the rapid development of consumer electronics, the demand for power adapters is increasing. Therefore, a high-precision, high-reliability, low-cost flyback AC-DC converter without auxiliary winding was proposed in this paper. The converter adopted a primary-side regulation (PSR) topology to sample the output voltage and current from the primary inductor, and adjusted the switching frequency to achieve a constant output voltage. By alternately switching the main power BJT and the auxiliary MOSFET, with the advantage of the base charge storage effect, the chip was powered by the primary-side current. A primary-side sampling resistor was placed at the negative terminal of the ground potential of the chip, which approached real-time monitoring of the primary-side current. This improved the reliability and output accuracy of the system. To verify the feasibility and performance of the proposed circuit, an IC controller was designed and fabricated under the NEC 1 ㎛ BCD process. Experimental result showed that deviations of the output voltage and current do not exceed±1.4% and±2.3%, respectively. These results also showed that the maximum conversion efficiency can reach a level of 78.7%, which satisfies the consumer market very well.
Meng, X.Z., Li, C.Y., Meng, T., An, Y.H.: Analysis and design of transformer windings schemes in multiple-output flyback auxiliary power supplies with high-input voltage. J. Power Electron. 19(5), 1122-1132 (2019)
Chang, C.Y., He, L.Y., Cao, Z.X., Zhao, D.D.: Flyback AC-DC converter with low THD based on primary-side control. J. Power Electron. 18(6), 1642-1649 (2018)
Chang, C.Y., He, L.Y., Bian, B., Han, X.: Design of a highly accuracy PSR CC/CV AC-DC converter based on a cable compensation scheme without an external capacitor. IEEE Trans. Power Electron. 34(10), 9522-9561 (2019)
Zhou, S.H., Zhou, G.H., Zeng, S.H., Xu, S.G., Cao, T.Q.: Sampled-data modeling and dynamic behavior analysis of peak current-mode controlled flyback converter with ramp compensation. J. Power Electron. 19(1), 190-200 (2019)
Liang, T.J., Chen, K.H., Chen, J.F.: Primary side control for flyback converter operating in DCM and CCM. IEEE Transs. Power Electron. 33(4), 3604-3612 (2018)
Xu, S., Zhang, X.M., Wang, C., Sun, W.F.: High precision constant voltage digital control scheme for primary-side controlled flyback converter. IET Power Electron. 9(13), 2522-2533 (2016)
Shao, J.W.: A highly accurate constant voltage (CV) and constant current (CC) primary side controller for offline applications. In: Proceedings of IEEE on Applications of Power Electronics Conference, pp. 3311-3316 (2013)
Chang, C.Y., Xu, Y., Bian, B., Zhao, X.: A high-precision CV/CC AC-DC converter based on cable and inductance compensation schemes. IEEE Trans. Power Electron. 31(9), 6372-6382 (2015)
Chen, Y., Chang, Y., Yang, P.I.: A novel primary-side controlled universal-input AC-DC LED driver based on a source-driving control scheme. IEEE Trans. Power Electron 30(8), 4327-4335 (2015)
Shagerdmootaab, A., Moallem, M.: A novel primary-side LED power regulation without auxiliary winding. In: Annual Conference of the IEEE Industrial Electronics Society (IECON). pp. 3720-3725 (2015)
Bai, Y.J., Chen, W.J., Yang, X.Y., Yang, X., Xu, G.Z.: A novel constant voltage primary-side regulation topology to eliminate auxiliary winding. In: 2016 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1-6 (2016)
AI-Helper
※ AI-Helper는 부적절한 답변을 할 수 있습니다.