Patent ID: 9214887
Filing Date: 2015-12-15
Classification: H02P

Abstract:
1. An apparatus for driving a voice coil motor (VCM), the apparatus comprising: an instruction signal generating unit generating an instruction signal according to a digital signal generated from an input signal; and a driving unit driving the VCM by selecting a path for a driving current applied to the VCM according to a value of the digital signal and controlling a duty of the driving current according to a current level of the instruction signal, the instruction signal having a maximum current level at a minimum digital level and a maximum digital level of the digital signal, and the instruction signal having minimum current level at a first digital level of the digital signal, and the instruction signal decreasing linearly, as the digital level is increased from the minimum digital level to the first digital level, and the instruction signal increasing linearly, as the digital level is increased from the first digital level to the maximum digital level.