基于电流变化率的准恒频滞环电流控制方法

针对滞环电流控制存在的开关频率不固定，设计输出滤波器困难的缺点，通过对开关频率与滞环环宽关系的分析，提出了一种根据电流变化率调节环宽的准恒频滞环电流控制方法。控制方法根据电流变化率来实时调节滞环控制的环宽，实现开关频率的恒定；具有响应速度快和稳定性好的优点，同时克服了滞环电流控制开关频率不固定的缺点；较已有方法计算量小，不依赖于系统参数，容易实现，并通过理论推导和仿真证实了方法的可行性和正确性。

Novel Control Method for Hysteresis-band Current with Quasi-constant Frequency based on Current Change Rate

Switching frequency of hysteresis-band current control is inconstant, which leads to the difficulties of filter design and the problem of sampling rate. On the basis of analyzing the relationship between hysteresis-band and switching frequency, a novel hysteresis-band current control method with quasi-constant frequency based on current change rate is proposed to solve this problem. With rapid response and good stability, the proposed method can adjust the hysteresis band according to the current change rate so as to keep the switching frequency constant. As this method doesn’t require the information about the system’s parameters, it is simple and easy to be implemented. Simulation and experimental results have validated the method’s effectiveness.