Voice coil motor shaping signal and driving control method and driving chip circuit

A technology of voice coil motor and control method, which is applied in the direction of AC motor control, control system, pulse shaping, etc., and can solve the problems of shortening battery life, unsatisfactory autofocus, and accelerated autofocus speed, etc.

Active Publication Date: 2015-01-28
东莞市展鑫电子科技有限公司
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Problems solved by technology

One way is to increase the damping coefficient of the system, thereby reducing or even eliminating residual oscillation and speeding up autofocus; but this requires greater power consumption and will significantly shorten battery life
Another method is to divide a long driving stroke into many short strokes, and then drive the voice coil motor in step divisions, and finally reach the target position; this method reduces the amplitude of the residual oscillation at each step, but It does n

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  • Voice coil motor shaping signal and driving control method and driving chip circuit
  • Voice coil motor shaping signal and driving control method and driving chip circuit
  • Voice coil motor shaping signal and driving control method and driving chip circuit

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Embodiment Construction

[0079] The shaping signal and driving control method of the voice coil motor and the driving chip circuit of the present invention will be described in more detail below in conjunction with the schematic diagram, which shows a preferred embodiment of the present invention. It should be understood that those skilled in the art can modify the description herein. the present invention while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as the broad knowledge of those skilled in the art, but not as a limitation of the present invention.

[0080] In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions and constructions are not described in detail since they would obscure the invention with unnecessary detail. It should be appreciated that in the development of any actual embodiment, numerous implementation details must be...

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Abstract

The invention provides a voice coil motor shaping signal control method, a driving chip and a control method of the driving chip. According to input shaping, convolution is conducted on a pulse sequence and an input signal of a system, and thus a shaped input signal is generated; the shaped signal acts on the system, the remnant oscillation of the system can be eliminated or greatly reduced, the adaptive error range of system parameters of a voice coil motor can be enlarged, and the cost for designing, producing and testing a voice coil motor module can be reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits and is used for the control of camera voice coil motor drives, in particular to a control method for a second-order underdamped system. Background technique [0002] Voice coil motors (VCMs) are widely used in driving camera lenses in smartphones and tablets. The voice coil motor driver chip receives the control signal provided by the system driver chip, outputs the corresponding linear current, and controls the position of the camera lens through the voice coil motor, thereby realizing autofocus. The voice coil motor can be equivalent to a second-order underdamped oscillation system. When the voice coil motor reaches the target position, it does not stop immediately, but performs damped oscillation centered on this position, and it takes a long time to stabilize. This residual oscillation greatly prolongs autofocus time. [0003] Generally, there are several methods that can be used to reduce...

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Application Information

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IPC IPC(8): H03K5/01H02P25/06G02B7/09
Inventor 周海峰李仁果
Owner 东莞市展鑫电子科技有限公司
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