Patent ID: 6762745
Filing Date: 2004-07-13
Classification: G06F

Abstract:
A circuit and method for commanding a desired force from an actuator provided in a force feedback device, the method comprising providing two drive signals, each of said drive signals operative to cause current to flow in a different direction in said actuator, thereby causing force to be output by the actuator in two different corresponding directions; when a desired force to be output is below said predetermined threshold force, alternating between said two drive signals for each period of said drive signals to cause a corresponding current in the actuator, thereby switching said direction of said desired force for each of said periods; when said desired force is above said predetermined threshold force, using only one of said drive signals to cause current in said actuator in one direction and said desired force to be output in one direction; and wherein said drive signal are PWM (PULSE-WIDTH MODULATOR) drive signals.