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This paper proposes a new phase shedding scheme for interleaved Boost PFC converter to improve the light load efficiency. In the proposed scheme, the power level in the slave channels is reduced linearly as the output loading drops for optimization of light load efficiency. The new scheme also prevents the PFC slaves from switching between the ON and OFF states immediately after phase shedding, thereby...
This paper presents the modeling of a voice coil motor (VCM) used for the auto-focusing control of a digital camera in applications to high-performance mobile phones. The force constant and its associated back EMF constant of a VCM can be highly nonlinear with the mechanical structure. Conventional modeling technique using the derived flux distribution based on geometrical structure is quite involved...
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...
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