Journal of Guangdong University of Technology ›› 2017, Vol. 34 ›› Issue (02): 69-73.doi: 10.12052/gdutxb.160064

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A Study of Non-existent Current Intrusion in Forward Synchronous Rectifier Circuit under the Condition of Light Load

Sun An-quan, Chen Lin-hai, Pan Yong-xiong   

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2016-04-26 Online:2017-03-09 Published:2017-03-09

Abstract:

To overcome the reduction of efficiency of circuit caused by the Buck filter inductor current flow backward in the circuit of voltage self-driven synchronous rectifier under light load, the relation between the demagnetization reset time of common forward converter topology and the current of Buck filter inductor back to zero time is analyzed. Based on this relation, the reason of the Buck filter inductor current flowing backward so that the forward converter with voltage self-driven synchronous rectifier circuit works at light load have been found. An active fast discharge circuit is proposed to be added in synchronous rectifier MOS transistor driven circuit whose function is freewheeling. And this circuit forces synchronous rectifier MOS to close rapidly after the magnetic field flux of main transformer reset. Thus it can prevent the inductor current flow backward. The prototype test results show that this design has been verified effective and feasible by the experiment result.

Key words: industrial power, forward converter, synchronous rectification, DCM mode, inductor current intrusion

CLC Number: 

  • TM502

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