Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

PSR CC/CV AC-DC converter with an adaptive high-precision closed-loop constant current control scheme

  • Gu, Yang (School of Microelectronics, Southeast University) ;
  • Ju, Dongqian (School of Microelectronics, Southeast University) ;
  • Wang, Lei (School of Microelectronics, Southeast University) ;
  • Ren, Jie (School of Microelectronics, Southeast University) ;
  • Chang, Changyuan (School of Microelectronics, Southeast University)
  • Received : 2020.11.10
  • Accepted : 2021.04.07
  • Published : 2021.07.20
⟨ Previous Next ⟩

Abstract

A primary-side regulation (PSR) constant current (CC) output and constant voltage (CV) output AC-DC converter is proposed and an adaptive high-precision closed-loop constant current control scheme is put forward in this paper. In the CC mode, the converter adopts the closed-loop control strategy to realize that the switching period adaptively converges to twice the demagnetization time, which realizes the CC output. In addition, exactly detecting the demagnetization time is a prerequisite for obtaining a high-precision output current. Therefore, a demagnetization time detection circuit is designed to provide accurate and reliable demagnetization information. The control IC was fabricated with the Nuvoton 0.5um BCD process, and a 5 V/2 A prototype circuit was implemented to verify its performance. Experimental results show that the CC deviation is within ± 1.4%, which is lower than the target value of ± 2.0%. Under different loads and AC inputs, the conversion efficiency in the CC mode varies between 76.3% and 80.7%.

Keywords

References

  1. Shao. J.: A highly accurate constant voltage (CV) and constant current (CC) primary side controller for offline applications. In: Proc. 28th Annu. IEEE Appl. Power Electron. Conf. Expo., pp. 3311-3316 (2013)
  2. He, L.Y., Chang, C.Y., Chen, C., Wang, L.: Design of a high accuracy PSR CC/CV AC-DC converter without auxiliary winding. IEEE Trans. Power Electron. 35(8), 8165-8172 (2020) https://doi.org/10.1109/tpel.2019.2960036
  3. 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), 9552-9561 (2019) https://doi.org/10.1109/tpel.2019.2893737
  4. Chen, Y., Chang, C.Y., Yang, P.L.: 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) https://doi.org/10.1109/TPEL.2014.2359585
  5. Wang, Z.Y., Lai, X.Q., Wu, Q.: A PSR CC/CV flyback converter with accurate CC control and optimized CV regulation strategy. IEEE Trans. Power Electron. 32(9), 7045-7055 (2017) https://doi.org/10.1109/TPEL.2016.2629846
  6. Chang, C.Y., Jiang, T.L., Yang, P.L., Xu, Y., Xu, C.X., Chen, Y.: Adaptive line voltage compensation scheme for a source-driving controlled AC-DC LED driver. IET Circuits Devices Syst. 11(1), 21-28 (2017) https://doi.org/10.1049/iet-cds.2016.0171
  7. Zhu, Z.M., Wu, Q., Wang, Z.Y.: Self-compensating OCP control scheme for primary-side controlled flyback AC/DC converters. IEEE Trans. Power Electron. 32(5), 3673-3682 (2017) https://doi.org/10.1109/TPEL.2016.2587803
  8. Wang, C., Xu, S., Lu, S.L., Sun, W.F.: A low-cost constant current control method for DCM and CCM in digitally controlled primary-side regulation flyback converter. IEEE J. Emerg. Sel. Topics Power Electron. 6(3), 1483-1494 (2018) https://doi.org/10.1109/jestpe.2017.2779136
  9. Wu, C.N., Chen, Y.L., Chen, Y.M.: Primary-side peak current measurement strategy for high-precision constant output current control. IEEE Trans. Power Electron. 30(2), 967-975 (2015) https://doi.org/10.1109/TPEL.2014.2312955