Design of Bootstrap Power Supply for Half-Bridge Circuits using Snubber Energy Regeneration

  • Chung, Se-Kyo (Dept. of Control and Instrumentation Eng., Gyeongsang National University) ;
  • Lim, Jung-Gyu (Dept. of Control and Instrumentation Eng., Gyeongsang National University)
  • Published : 2007.10.20


This paper deals with a design of a bootstrap power supply using snubber energy regeneration, which is used to power a high-side gate driver of a half-bridge circuit. In the proposed circuit, the energy stored in the low-side snubber capacitor is transferred to the high-side bootstrap capacitor without any magnetic components. Thus, the power dissipation in the RCD snubber can be effectively reduced. The operation principle and design method of the proposed circuit are presented. The experimental results are also provided to show the validity of the proposed circuit.


  1. R. L. Lin and F. C. Lee, 'Single power supply based transformerless IGBT/MOSFET gate driver with 100% high-side turn-on duty cycle operation performance using auxiliary bootstrapped charge pumper,' in Conf. Rec. IEEE PESC '97, pp. 1205-1209, 1997
  2. 'HV floating MOS-gate driver ICs,' International Rectifier Application Note AN978-b, International Rectifier Co., El Segundo, CA, 2003
  3. J. Adams, 'Bootstrap component selection for control IC's,' International Rectifier Design Tip DT98-21, International Rectifier Co., El Segundo, CA, 2001
  4. G. F. W. Khoo, D. R. H. Carter, and R. A. McMahon, 'Analysis of a charge pump power supply with a floating voltage reference,' IEEE Trans. Circuit & Systems-I: Fund. Theory & Appl., vol. 47, no. 10, pp. 1494-1501, 2000
  5. C. G. Steyn, 'Analysis and optimization of regenerative linear snubbers,' IEEE Trans. Power Electron., vol. 4, no. 3, pp. 362-370, 1989
  6. J. F. Stephen, B. W. Williams, and T. C. Green, 'RCD snubber revisited,' IEEE Trans. Ind. Appl., vol. 32, no. 1, pp. 155-160, 1996
  7. S. Park and T. M. Jahns, 'A self-boost charge pump topology for a gated drive high-side power supply,' in Conf. Rec. IEEE APEC 2003, pp. 126-131, 2003
  8. D. W. Hart, Introduction to Power Electronics, Prentice Hall, NJ, 1997