一种2阶小阻尼系数负载的快速补偿驱动法

提出了一种2阶小阻尼系数负载的快速补偿驱动方法。根据2阶系统传递函数,对2阶小阻尼系数负载的驱动信号进行变换,将具有相同衰减振荡周期的正、负向阶跃响应进行不同时间点的叠加,以补偿单个阶跃响应的衰减振荡振幅,实现了2阶小阻尼系数负载驱动响应的快速稳定。应用该补偿驱动法,采用0.18μm CMOS工艺设计并流片了一颗开环控制的音圈电机驱动芯片。结果表明,在10 ms谐振周期的条件下,与最优驱动电流对应的音圈电机位移振幅仅为0.925%,建立时间仅为7.8 ms。

A Fast Compensation Driving Method of the Second Order Load with Small Damping Coefficient

A fast compensation driving method of the second order load with small damping coefficient was presented. According to the transfer function of the second order system, the driving signal of the second order load with small damping coefficient was transformed, and the positive and negative step response with the same damping oscillation period were added with different time to compensate the damping oscillation amplitude of a single step response, so as to achieve the fast and stable driving response of the second order load with small damping coefficient. Applied in this compensation driving method, an open loop controlled voice coil motor driver chip was designed and tape-out in a 0.18 μm CMOS technology. The results showed that the displacement amplitude of voice coil motor corresponding to the optimal driving current was only 0.925%, and the establishment time was only 7.8 ms under the condition of the resonant period of 10 ms.