Shaping signal control method of camera voice coil motor actuator
A technology for shaping signals and voice coil motors, which is applied in electrical program control, program control in sequence/logic controllers, etc., and can solve the problems of motor oscillation, ignoring the damping coefficient of motor oscillation, and the influence of the clock cycle fault tolerance rate. The effect of fault tolerance
Active Publication Date: 2018-07-13
GIANTEC SEMICON LTD
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However, these methods ignore the vibration damping coefficient of the motor. When the motor damping coefficient is large to a certain extent, this method will have certain deficiencies in controlling the motor. Has a certain impact on the fault tolerance rate of the clock cycle
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[0039] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.
[0040] Aiming at the damping coefficient of the voice coil motor of the camera, the present invention provides the calculation principle of the shaping signal control method, and makes corresponding modifications to the control method in the patent document with the application number of 201510040282.2. The modified algorithm can eliminate the Undesirable effects due to the damping factor. By using the shaping signal obtained by the calculation method of the present invention, various under-damped oscillation motors can be better controlled.
[0041] Such as figure 1 As shown, a method for controlling a shaping signal of a camera voice coil motor actuator, the shaping signal is an N-order shaping signal, and controls the camera voice coil motor to rise to a target height A. The shaping signal control method incl...
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The invention discloses a shaping signal control method for a voice coil actuator of a camera. The method comprises the following steps that rise / fall time of each rise / fall step in a shaping signal is calculated; the initial rise / fall amplitude of the corresponding rise / fall step is calculated according to the rise / fall time of each rise / fall step; a rise / fall amplitude fine tuning coefficient of the shaping signal is calculated according to the initial rise / fall amplitude of each rise / fall step; and a given value of the rise / fall amplitude of each rise / fall step is calculated according to both the rise / fall amplitude fine tuning coefficient of the shaping signal and the initial rise / fall amplitude of each rise / fall step. According to the invention, the frequency and damping coefficient in oscillation characteristic of a motor are taken into full consideration, oscillation of the motor is inhibited, and error between a clock period and a natural oscillation period of the voice coil motor is highly tolerant.
Description
technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a shaping signal control method of a camera voice coil motor actuator. Background technique [0002] Voice coil motors are widely used in electronic products. In recent years, it has been widely used in the camera lens drive of smartphones and tablets. The voice coil motor driver (Lens Driver) chip receives an external signal (usually provided by the image processing chip in the main chip in the mobile phone) and provides a corresponding linear output current to control the position of the camera lens through the voice coil motor actuator (Voice Coil Actuator), thereby Achieve Auto Focus effect. With the improvement of the quality of life and consumption level, people's requirements for camera performance are also rising. How to shorten the focusing time of the camera and increase the speed of taking pictures of the camera is an important aspect of improving ...
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IPC IPC(8): G05B19/04
CPCG05B19/04
Inventor 陈珍珍张洪杨清
Owner GIANTEC SEMICON LTD