Apparatus for driving actuator of camera module in mobile device

摘要

Embodiments of the invention provide an apparatus for driving an actuator of a camera module in a mobile device. The apparatus includes a proportional-integral-derivative (PID) controller configured to compare an output of a gyro sensor with an output of a hall sensor configured to sense a position of an actuator to output a digital signal of plural bits, and a differential current digital-to-analog converter configured to convert the digital signal output from the PID controller into an analog current signal. The apparatus further includes a linear driver configured to receive the signal output from the differential current digital-to-analog converter to output a linear driving signal, an H-bridge circuit configured to control magnitudes of a forward driving current and a reverse driving current flowing in the actuator based on the output of the linear driver, and a driving direction controller configured to output a signal controlling a direction of current flowing in the actuator to the H-bridge circuit based on the digital signal output from the PID controller.

主权项

1. An apparatus for driving an actuator of a camera module in a mobile device, the apparatus comprising:
a proportional-integral-derivative (PID) controller configured to compare an output of a gyro sensor with an output of a hall sensor configured to sense a position of an actuator, and to output a digital signal; a differential current digital-to-analog converter configured to convert the digital signal output from the PID controller into an analog current signal; a linear driver configured to amplify the signal output from the differential current digital-to-analog converter, and to output a linear driving signal; an H-bridge circuit configured to apply a forward driving current, or a reverse driving current having a linear characteristic with respect to the output of the differential current digital-to-analog converter, to the actuator; and a driving direction controller configured selectively output the linear driving signal to the H-bridge circuit, based on the digital signal output from the PID controller, thereby controlling a direction of current flowing in the actuator to the H-bridge circuit.