Current-mode sensorless control of single-phase brushless DC fan motors

Wei Chao Chen*, Ying-Yu Tzou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

This paper proposes a new control scheme for the implementation of a low-cost and high efficiency sensorless speed control IC for single-phase brushless dc (BLDC) fan motors. The proposed control scheme detects the zero-crossing-point (ZCP) of the measured back-EMF to generate commutation signals without Hall sensor. A current mode soft switching scheme is used to smooth the current spikes induced by the reduction of the back-EMF when the rotor is crossing the commutation boundary. An adaptive blanking time control strategy is used to adjust the time interval to ensure correct detection of the ZCP. An open-loop constant Ampere/Hertz ramping control scheme is developed for the startup control from zero speed and switching to sensorless mode once the ZCP is detected. The proposed sensorless control scheme has been verified by using computer simulation based on a developed single-phase BLDC fan motor model. Experimental verification of the proposed control scheme has been carried out by using digital implementation technique. Experimental results reveal the superior performance of the proposed control scheme.

Original languageEnglish
Title of host publication2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011
Pages659-663
Number of pages5
DOIs
StatePublished - 1 Dec 2011
Event2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011 - Singapore, Singapore
Duration: 5 Dec 20118 Dec 2011

Publication series

NameProceedings of the International Conference on Power Electronics and Drive Systems

Conference

Conference2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011
CountrySingapore
CitySingapore
Period5/12/118/12/11

Keywords

  • adaptive blanking time control
  • digital motor control IC
  • sensorless control
  • single-phase brushless dc fan motor
  • soft commutation
  • soft start-up control

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