Method for driving a linear resonant actuator

By measuring the voltage and current phase difference of the LRA and adjusting the drive signal frequency using a feedback control loop, the problem of inaccurate resonant frequency determination in the prior art is solved, achieving high-precision resonant frequency control and improved vibration performance.

CN122374970APending Publication Date: 2026-07-10GOODIX TECH HK CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GOODIX TECH HK CO LTD
Filing Date
2024-12-12
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately determine the resonant frequency of a linear resonant actuator (LRA) during tactile events, resulting in poor vibration performance or unwanted ringing. Furthermore, existing methods are complex and may lead to energy loss.

Method used

By measuring the phase difference between the voltage and current on a linear resonant actuator (LRA), a feedback control loop is used to adjust the frequency of the drive signal so that it converges to the predetermined phase difference at resonance, thereby achieving precise control of the resonant frequency.

Benefits of technology

It achieves high-precision resonant frequency determination during tactile events, avoids unnecessary vibration interference, improves vibration intensity and reduces energy loss, and avoids the generation of audible noise.

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Abstract

A method, processing system, and control circuit for driving a linear resonant actuator in an electronic device include generating a drive signal to drive the linear resonant actuator, wherein the frequency of the drive signal is initially set to an initial frequency (f). i The method involves determining the phase difference (Δφ) between the voltage and current on the linear resonant actuator, and adjusting the frequency of the drive signal using a feedback control loop such that the determined phase difference (Δφ) converges to a non-zero predetermined phase difference (Δφ0) at resonance. This application also relates to an electronic device having a linear resonant actuator, processing system, or control circuit driven using this method.
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