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针对磁共振成像对梯度放大器的性能要求,提出一种状态反馈和比例积分相结合的控制算法。介绍了放大器的主电路结构,对输出滤波器进行了优化设计。基于滤波器和负载模型,采用状态量反馈法,设计了二次型最优调节器以使系统具有良好的动态性能。为减小模数转换的有限有效位数对控制算法稳态性能的影响,进一步使用了差值放大结合比例积分的调节器。仿真和实验结果证明,系统具有良好的动态和稳态性能。
Aimed at the performance requirements of gradient amplifier for magnetic resonance imaging, a control algorithm based on state feedback and proportional integral is proposed. The main circuit structure of the amplifier is introduced, and the output filter is optimized. Based on the filter and load model, the quadratic optimal regulator is designed by using state quantity feedback method to make the system have good dynamic performance. In order to reduce the influence of the finite effective number of analog-to-digital conversion on the steady-state performance of the control algorithm, the regulator of differential amplification combined with proportional integral is further used. Simulation and experimental results show that the system has good dynamic and steady-state performance.