Driving method and system of voice coil motor, camera module and mobile phone

Abstract

The application provides a driving method and system of a voice coil motor, a camera module and a mobile phone. The controller receives configuration parameters through a communication interface, and generates control commands according to the configuration parameters. The waveform generation unit can then receive and generate a sinusoidal current waveform in response to the control command. The digital-to-analog converter receives and converts the sinusoidal current waveform in response to the control command, obtains a driving current corresponding to the sinusoidal current waveform, and outputs the driving current to drive the voice coil motor. In this way, by using the sine wave current waveform to output the corresponding driving current, thereby reducing the high-frequency component in the current waveform, the overshoot value of the VCM can be effectively reduced, and therefore, the serious overshoot phenomenon in the prior art when driving the VCM can be solved. , leading to the problem of long VCM harmonic oscillation time.

Description

technical field [0001] The present application relates to the technical field of motor control, in particular to a method and system for driving a voice coil motor, a camera module and a mobile phone. Background technique [0002] With the development of science and technology, smart phones are updated faster and faster. In addition to the basic performance of mobile phones, mobile phone camera and camera performance have also become the focus of competition among various businesses. The driving core in the camera is the voice coil motor (Voice Coil Motor, VCM). VCM is a device that converts electrical energy into mechanical energy, and realizes linear and limited swing angle motion. The interaction between the magnetic poles in the magnetic field from the permanent magnet steel and the magnetic field generated by the energized coil conductor can be used to generate regular motion. Because VCM is a non-commutating power device, its positioning accuracy depends on the feedb...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in the method of using the VCM to drive the lens, when the VCM is driven, since the drive current contains a lot of high-frequency components, there is usually a serious overshoot phenomenon in the driving process, and if the overshoot is too large, it will affect the The consistency of the spring in the voice coil motor will cause metal fatigue over time, and the change of the elastic coefficient of the spring will affect the performance and reliability of the VCM

In addition, severe overshoot phenomenon will also lead to longer VCM harmonic oscillation time. The lens is linked to the VCM through physical materials. The longer the VCM harmonic oscillation time, the longer the lens stabilization time. Therefore, the lens cannot be stabilized quickly.

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