Design and implementation of a voice-coil motor servo control IC for auto-focus mobile camera applications

Jhih D. Hsu*, Ching Lung Tsai, Ying-Yu Tzou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

This paper presents the design methodology to implement a fully digital control IC for the position control of the auto-focus (AF) lens module in applications to mobile phone camera using the field programmable gate array (FPGA). As compared with the conventional stepping motor control with a spring return fixture, the AF lens module is driven by a voice-coil motor (VCM) with a digital servo drive IC. The proposed digital servo drive IC includes a digital servo controller, a digital current controller, and a full-bridge dc-dc converter. The designed digital servo drive IC provides a total digital solution to the position control of the AF lens module in applications to highperformance light-weight slim-type mobile phone camera and video. The designed AF lens module can reach a control range of 0.6 mm within 30 ms with a control resolution less than 5 μm, a peak driving force of 30 mN, and a peak output current of 120 mA.

Original languageEnglish
Title of host publicationPESC 07 - IEEE 38th Annual Power Electronics Specialists Conference
Pages1357-1362
Number of pages6
DOIs
StatePublished - 1 Dec 2007
EventPESC 07 - IEEE 38th Annual Power Electronics Specialists Conference - Orlando, FL, United States
Duration: 17 Jun 200721 Jun 2007

Publication series

NamePESC Record - IEEE Annual Power Electronics Specialists Conference
ISSN (Print)0275-9306

Conference

ConferencePESC 07 - IEEE 38th Annual Power Electronics Specialists Conference
CountryUnited States
CityOrlando, FL
Period17/06/0721/06/07

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    Hsu, J. D., Tsai, C. L., & Tzou, Y-Y. (2007). Design and implementation of a voice-coil motor servo control IC for auto-focus mobile camera applications. In PESC 07 - IEEE 38th Annual Power Electronics Specialists Conference (pp. 1357-1362). [4342192] (PESC Record - IEEE Annual Power Electronics Specialists Conference). https://doi.org/10.1109/PESC.2007.4342192