Design and Implementation of a DCM Flyback Converter with Self-biased and Over-Current Protection Circuit
This paper presents a low-cost design of flyback converter in high-voltage and low-power application. The flyback converter is designed with the E–I Ferrite core MTC transformers with high permeability and high saturation point. The control circuit is designed around the integrated chip of UC3844 fixed frequency current mode controller incorporated with error amplifier, current sensing comparator, and a high totem pole output driver. External biasing is not required for the control circuit as it is directly biased from the high-voltage line and high-frequency transformer. Isolation is provided by transformer and optocoupler for input–output and power control circuit, respectively. Voltage and current are sensed through the resister divider circuit and shunt resistor, respectively. Control characteristics and performance of the flyback converter are simulated using PSIM software, and 20 W flyback converter hardwire circuit is built to validate the analytical results under variable load current and variable source voltage. Performance of the converter with variable input voltage (25–55 V) and variable load (50–200 Ω) is reported.
KeywordsMultiple output flyback PWM Steady state response Current control loop
This work has been supported by DST-PURSE, Savitribai Phule Pune University. R. Rashmi is thankful to University Grant Commission for SRF.
- 2.T.H. Chen, W.L. Lin, C.M. Liaw, Dynamic modelling and controller design of Flyback converter. IEEE Trans. Aerosp. Electron. Syst. 35(4) (1999). https://doi.org/10.1109/7.805441
- 3.J.-W. Yang, H.-L. Do, Soft-switching dual-flyback dc–dc converter with improved efficiency and reduced output ripple current. IEEE Trans. Ind. Electron. 64(5) 3587–3594 (2017). https://doi.org/10.1109/tie.2017.2652404
- 4.P.-L. Huang, D. Chen, C.-J. Chen, Y. Ming, An adaptive high-precision overpower protection scheme for primary-side controlled Flyback converters. IEEE Trans. Power Electron. 26(10), 2817–2824 (2011). https://doi.org/10.1109/tpel.2011.2106223
- 5.Y. Liu, D. Zhang, Z. Li, Q. Huang, B. Li, M. Li, J. Liu, Calculation method of winding eddy-current losses for high-voltage direct current converter transformers. IET Electric Power Appl. 10(6), 488–497 (2016). https://doi.org/10.1049/iet-epa.2015.0559
- 6.G. Chryssis, High Frequency Switching Power Supplies: Theory and Design, 2nd edn. (McGraw-Hill Publishing)Google Scholar
- 7.A.I. Pressman, Switching Power Supply Design, 2nd edn. (McGraw-Hill Publishing), pp. 209–222Google Scholar
- 8.K. Billing, T. Morey, Switchmode Power Supply Handbook, 3rd edn. (McGraw-Hill Publishing), pp. 3.139–3.350Google Scholar
- 9.R. Rashmi, A. Lembhe, P.A. Kharade, M.D. Uplane, Current controlled single-phase interleaved boost converter with power factor correction. Int. J. Adv. Res. Electr. Electron. Instrum. Eng. 5(4) (2016). https://doi.org/10.15662/ijareeie.2016.0504055
- 10.L. Umanand, Power Electronics Essentials and Application (Wiley India Pvt. Ltd., 2013), pp. 549–560Google Scholar
- 11.R. Leeans, S.-H. Hsu, Design and implementation of self-oscillating flyback converter with efficiency enhancement mechanisms. IEEE Trans. Ind. Electron. 62(11), 6956–6964 (2015). https://doi.org/10.1109/tie.2015.2436880