Patent ID: 11870371
Assignee: POLIGHT ASA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 8:
9. An actuator system comprising a piezoelectronic actuator (PEA), a piezo driver connected to drive the PEA, and a processing unit connected to the piezo driver and holding software for controlling the piezo driver, wherein:
the processing unit further holds a relation d(tt) between a displacement measure (d) and transition time (tt) established during an initial calibration of the actuator system, wherein the transition time is a charging or discharging time ΔT between two voltages VA and VB applied to the PEA; and
the software is configured to, after repeated biasing of the PEA, control the driver to apply a sequence of voltages to the PEA and measure the transition times between the voltages to determine a relation ttnew(V) between transition time and voltage (V), and to substitute ttnew(V) in d(tt) to calculate a compensated relation dc(V).