Control circuit and method

摘要

In accordance with an embodiment, an actuator control circuit includes a driver circuit connected to a ringing characteristic determination circuit. A signal generator that is configured to generate an output signal having first period that has first and second portions where the first portion longer than the second portion is connected to the ringing characteristic determination circuit. Another embodiment includes a method for controlling an actuator by determining a resonant frequency and a ringing amplitude of an actuator signal; generating a control signal in response to the resonant frequency and the ringing amplitude of the actuator signal; and causing the actuator to move in response to the second drive signal.

主权项

1. A method for controlling an actuator, comprising:
providing a drive circuit having an input and a first input/output terminal and an actuator coupled to the first input/output terminal; causing the actuator to move in response to a first drive signal generated by a signal generator coupled to the input of the drive circuit; determining a resonant frequency and a ringing amplitude from a movement of the actuator using a ringing characteristic determination circuit, wherein the ringing characteristic determination circuit has an input coupled to the first input/output terminal of the drive circuit and to the actuator; generating a second drive signal from the signal generator in response to resonant period data and ringing amplitude data received from the ringing characteristic determination circuit and in response to actuator position data, wherein the actuator position data is derived by summing or subtracting a new position of the actuator generated by a first position indicator to or from a previous position of the actuator generated by a second position indicator; and causing the actuator to move in response to the second drive signal.