Actuator control device and method

A technology of a control device and a control method, applied in the field of actuator devices, capable of solving problems such as difficulty in generating actuator braking signals

Pending Publication Date: 2021-02-19
DONG WOON ANATECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Generally, in order to reduce the residual vibration of the actuator, it detects the zero-crossing point of the back electromotive force (BEMF) signal and the amplitude of the BEMF signal, and automatically generates and controls the brake signal, but when the driving time is short or the amplitude of the BEMF signal hours, it is difficult to generate an effective waveform of the braking signal capable of reducing the residual vibration of the actuator

Method used

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  • Actuator control device and method
  • Actuator control device and method
  • Actuator control device and method

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Embodiment Construction

[0050] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions such as related known functions or configurations may unnecessarily obscure the gist of the present invention, their detailed descriptions will be omitted. For example, an actuator control device according to an embodiment of the present invention is applicable to a tactile feedback system, and it is assumed that a device to which the present invention can be applied includes a touch-sensitive surface or other type of interface and an actuator, and it is assumed that the touch surface generates Vibration of the actuator.

[0051] Meanwhile, in terms used hereinafter, the term "driving waveform" refers to a waveform applied to an actuator during a driving time interval constituting a driving signal, and may be changed in such a way that adjusting the lengt...

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Abstract

The present invention relates to a haptic feedback system and, particularly, to a device and a method for controlling an actuator for haptic feedback, the method comprising: a first step of controlling the output of an oscillator such that a clock necessary in the generation of a driving signal for driving an actuator is oscillated at a reference clock frequency; a second step of calculating the resonance frequency of the actuator from a cycle of a BEMF signal according to the driving of the actuator; and a third step of calculating a clock frequency for following the calculated resonance frequency of the actuator so as to newly change and set same to the reference clock frequency, thereby controlling the output of the oscillator.

Description

technical field [0001] The present invention relates to haptic feedback systems, and more particularly, to apparatus and methods for controlling actuators for haptic feedback. Background technique [0002] Haptic feedback systems are installed and used in various devices for user interfaces. For example, tactile feedback is provided to the user through vibrations from a touch screen, softkey, home button, and fingerprint recognition sensor of the portable device. Recently, vibration feedback systems are also installed in many devices including touch screens, such as automobiles and home appliances. [0003] A Linear Resonance Actuator (LRA) is used as a device for generating vibration in a haptic feedback system. Linear resonant actuators have the property that only when the resonant frequency (f 0 ) to drive a linear resonant actuator, the maximum vibration with the best power efficiency is obtained. [0004] The resonant frequency of a linear resonant actuator can vary...

Claims

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Application Information

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IPC IPC(8): G06F3/01B06B1/02
CPCB06B1/0253B06B2201/70G06F3/016B06B1/0246
Inventor 李秀烈金喆会李坰录
Owner DONG WOON ANATECH
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