Methods and systems for in-system estimation of actuator parameters

Patent metadata

Field	Value
Publication number	US-11933822-B2
Application number	US-202217574188-A
Country	US
Kind code	B2
Filing date	Jan 12, 2022
Priority date	Jun 16, 2021
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A method for estimating actuator parameters for an actuator, in-situ and in real-time, may include driving the actuator with a test signal imperceptible to a user of a device comprising the actuator during real-time operation of the device, measuring a voltage and a current associated with the actuator and caused by the test signal, determining one or more parameters of the actuator based on the voltage and the current, determining an actuator type of the actuator based on the one or more parameters, and controlling a playback signal to the actuator based on the actuator type.

First claim

What is claimed is:

1. A method for estimating, in-situ and in real-time, actuator parameters for an actuator, the method comprising:
driving the actuator with a test signal imperceptible to a user of a device comprising the actuator during real-time operation of the device;
measuring a voltage and a current associated with the actuator and caused by the test signal;
determining one or more parameters of the actuator based on the voltage and the current;
determining an actuator type of the actuator based on the one or more parameters; and
controlling a playback signal to the actuator based on the actuator type.

2. The method of claim 1 , wherein the one or more parameters comprise mechanical impedance parameters of the actuator.

3. The method of claim 1 , wherein the one or more parameters comprise electrical impedance parameters of the actuator.

4. The method of claim 1 , wherein the test signal has a non-perceptible duration.

5. The method of claim 4 , wherein the non-perceptible duration is less than approximately 5 milliseconds.

6. The method of claim 1 , wherein the test signal has a non-perceptible amplitude.

7. The method of claim 6 , wherein the non-perceptible amplitude is between approximately 170 millivolts and approximately 130 millivolts.

8. The method of claim 1 , wherein the test signal has a frequency significantly different than a resonant frequency of the actuator.

9. The method of claim 1 , wherein measuring the current comprises measuring a sense voltage across terminals of a sense resistor in series with the actuator.

10. The method of claim 9 , further comprising operating the device in a plurality of modes comprising:
a characterization mode in which the sense resistor has a first resistance and in which the current is measured; and
an activation mode in which the sense resistor has a second resistance significantly smaller than the first resistance.

11. A system for estimating, in-situ and in real-time, actuator parameters for an actuator, the system comprising:
a test signal generator configured to generate a test signal imperceptible to a user of a device comprising the actuator in order to drive the actuator during real-time operation of the device; and
a measurement subsystem configured to:
measure a voltage and a current associated with the actuator and caused by the test signal;
determine one or more parameters of the actuator based on the voltage and the current;
determine an actuator type of the actuator based on the one or more parameters; and
control a playback signal to the actuator based on the actuator type.

12. The system of claim 11 , wherein the one or more parameters comprise mechanical impedance parameters of the actuator.

13. The system of claim 11 , wherein the one or more parameters comprise electrical impedance parameters of the actuator.

14. The system of claim 11 , wherein the test signal has a non-perceptible duration.

15. The system of claim 14 , wherein the non-perceptible duration is less than approximately 5 milliseconds.

16. The system of claim 11 , wherein the test signal has a non-perceptible amplitude.

17. The system of claim 16 , wherein the non-perceptible amplitude is between approximately 170 millivolts and approximately 130 millivolts.

18. The system of claim 11 , wherein the test signal has a frequency significantly different than a resonant frequency of the actuator.

19. The system of claim 11 , wherein measuring the current comprises measuring a sense voltage across terminals of a sense resistor in series with the actuator.

20. The system of claim 19 , the measurement system further configured to operate the device in a plurality of modes comprising:
a characterization mode in which the sense resistor has a first resistance and in which the current is measured; and
an activation mode in which the sense resistor has a second resistance significantly smaller than the first resistance.

Assignees

• Cirrus Logic Int Semiconductor Ltd
• Cirrus Logic Inc

Inventors

• Reynaga Jorge L
• Janko Marco A
• Marchais Emmanuel A
• Melanson John L

Classifications

• G01R19/0046 Primary

  characterised by a specific application or detail not covered by any other subgroup of G01R19/00 · CPC title

• G01R27/02

  Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant (by measuring phase angle only G01R25/00) · CPC title

• G08B6/00

  Tactile signalling systems, e.g. tactile personal calling systems · CPC title

• H02P29/00

  Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors (arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00) · CPC title

• H02P25/034 Primary

  Voice coil motors (voice coil motors driven by DC H02P7/025) · CPC title