Patent ID: 7719162
Filing Date: 2010-05-18
Classification: H02N

Abstract:
1. An electrostatic actuator comprising: an actuator control signal generator which generates an inverted actuator control signal and an actuator control signal by pulse-width modulating an actuator driving signal and a carrier signal; an actuator unit which comprises fixed comb electrodes and a moving comb electrode, adjusts a first voltage between a first fixed electrode among the fixed comb electrodes and the moving comb electrode according to the actuator control signal, and adjusts a second voltage between the moving comb electrode and a second fixed comb electrode among the fixed electrode combs according to the inverted actuator control signal, to control displacement of a target object, a sensor which senses a change of charges accumulated between the fixed comb electrodes and the moving comb electrode by using a Low Pass Filter (LPF); and an actuator driving signal controller which compares the sensed change of the charges with a reference value and generates an actuator driving signal based on a result of the comparison.