Apparatus and method for controlling actuator in camera module

摘要

An apparatus for controlling an actuator in a camera module is provided. The apparatus includes a position controller for producing a control voltage to move a lens of the camera module, a hall sensor for detecting an amount of change in magnetic lines of force generated by a magnet as a hall voltage, a voice coil motor for moving the lens according to a current applied thereto, and a current controller for using a voltage applied to the voice coil motor to detect an interference voltage created by the current applied to the voice coil motor, for generating an interference-eliminated hall voltage by removing the interference voltage from the hall voltage, and for controlling the current applied to the voice coil motor based on the control voltage and the interference-eliminated hall voltage.

主权项

1. An apparatus for controlling an actuator in a camera module, the apparatus comprising:
a position controller configured to produce a control voltage to move a lens of the camera module; a hall sensor configured to detect an amount of change in magnetic lines of force generated by a magnet to output a hall voltage; a voice coil motor configured to move the lens according to a current applied thereto; and a current controller comprising at least one operational amplifier (OP Amp) and a current booster, the current controller being configured to:
detect an interference voltage that is generated under the influence of the current applied to the voice coil motor, based on a voltage across a resistor that is connected to the voice coil motor through the current booster, the voltage across the resistor corresponding to the current applied to the voice coil motor,generate an interference-eliminated hall voltage by removing the detected interference voltage from the hall voltage,output a moving voltage, which is generated based on the control voltage and the interference-eliminated hall voltage, to the current booster, andcontrol, through the current booster, the current applied to the voice coil motor based on the moving voltage, wherein the at least one OP Amp is input with the hall voltage in a first terminal and input with the interference voltage in a second terminal to generate the interference-eliminated hall voltage, and wherein the current booster applies the current to the voice coil motor, based on the moving voltage.