Patent ID: 6078154
Filing Date: 2000-06-20
Classification: H02P,Y10S

Abstract:
Circuitry for determining actuator position, comprising:a first drive device having a signal input adapted for connection to a supply voltage, an output adapted for connection to a first input of an actuator and a control input responsive to a first control signal for conducting a first load current through an internal resistance of said first drive device defined between said signal input and said output thereof, said first load current thereby defining a first load voltage at said output of said first drive device;a second drive device having a signal input adapted for connection to a second input of the actuator, an output adapted for connection to a reference potential and a control input responsive to a second control signal for conducting said first load current therethrough from said signal input to said output of said second drive device, said first load current defining a second load voltage at said signal input of said second drive device, said first and second drive devices adapted for driving the actuator in a first direction via said first load current;means responsive to one of said first and second load voltages for detecting voltage pulses associated therewith; andmeans responsive to said voltage pulses for controlling activation and deactivation of said first and second control signals.