Shaping signal control method with high clock cycle fault tolerance

Abstract

A shaping signal control method with a high clock cycle error rate, so that the voice coil motor is driven by the following input control signals sent by the actuator: up a step to reach the second height at time T0; down a step to reach the first height at T1 time ;Up one step reaches the second height at time T2; up one step reaches the third height at T3 time; descends one step to reach the second height at T4 time; ascends one step to reach the fourth height at T5 time; ascends one step at T6 Reach the fourth height at any time; descend one step to reach the third height at T7; ascend one step to reach the fourth height at T8, ascend one step to reach the fifth height at T9, descend one step to reach the fourth height at T10, Go up a step to reach the fifth height at T11 and reach the target position. The invention can prevent the output of the motor from generating large jitter when the frequency of the motor deviates greatly from the clock frequency, and achieve stability quickly.

Description

Technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to a shaping signal control method with high clock cycle error tolerance of a camera voice coil motor actuator. Background technique [0002] Voice Coil Motor is widely used in electronic products. In recent years, it has been widely used in camera lens driving of smart phones and flat computers. The voice coil motor driver (Lens Driver) chip accepts external signals (the signal usually comes from the image processing chip in the main chip of the mobile phone) to provide the corresponding linear output current, which is controlled by driving the voice coil actuator (Voice Coil Actuator) The position of the camera lens to achieve AutoFocus effect. The voice coil motor actuator can be described by a second-order underdamping system. As the volume of the voice coil motor becomes smaller and the material improves, the damping coefficient of the system will also decrease....

AI Technical Summary

Problems solved by technology

In practical applications, there are errors in the natural oscillation period of the motor, the natural oscillation period of the motor changes at any time, the clock period in the circuit is inaccurate, and other reasons, which will make the difference between the clock period when the input signal is shaped and the natural oscillation period of the motor. There is an error between them, so that the oscillation of the motor output cannot be completely offset, resulting in aftershocks

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