基于FPGA的直接驱动阀用音圈电机功率驱动器

音圈电机的功率驱动器对控制器运算速度要求较高,传统方法普遍采用模拟控制,但其存在调试不便、特性漂移、不易实现复杂控制算法、无法与数字控制器直接实现接口等固有缺点.介绍了基于现场可编程门阵列(FPGA,Field Programmable Gate Array)的采用全数字式控制的直接驱动阀用音圈电机功率驱动器.利用FPGA通过模块化设计,实现了产生脉宽调制(PWM,Pulse Width Modulation)信号、电流信号采样及其数字滤波、电流闭环控制以及与其它数字控制器的通讯等功能.仿真及实验结果表明:所设计的基于FPGA的音圈电机功率驱动器具有良好的电流跟踪性能,可以满足直接驱动阀系统的控制要求.FPGA的运用,大大简化了系统硬件结构,提高了系统的控制性能,且便于扩展功能以及与其它数字控制器实现接口.

FPGA-based power drive device for voice coil motor used in direct drive valve

As the power drive device for voice coil motor requires a controller with higher computation speed, analog control is used in traditional method. There are inherent shortcomings, such as characteristics of drift, disabilities of interfacing with digital controller directly. A field programmable gate array (FPGA)-based power drive device for a voice coil motor used in direct drive valve is presented. The functions of generating pulse width modulation (PWM) signal, A/D sampling control, current sampling and digital filter, closed-loop current control, as well as communication with other digital controller were implemented by FPGA through modular design. Simulation and experimental results suggest the efficiency of FPGA-based power drive device to achieve high performances, and it can meet the requirements of direct drive valve system. The use of FPGA can greatly simplify the system hardware structure and improve the control system performances, and easily expand function and interface with other digital controllers.