【摘要】 提出了一种基于幅值△调制和时间△调制相结合的“双重△调制”电流跟踪控制新方法。将单边滞环电流比较器和开关周期定时器相结合,通过设定滞环比较器的下限值决定实际输出电流的下限,由定时器的定时周期决定实际输出电流的上限,该方法只需一个无滞环单阈值比较器,因而电路简单、动态响应快,特别是时间量化的载波定时保证了开关频率固定不变。给出了避免跟踪失步的一般性条件。仿真和实验结果均证明了该方法的有效性。更多还原

【Abstract】 A new current tracing control method based on double delta modulation, i.e., combining amplitude delta modulation with time delta modulation, is presented. The amplitude delta modulation is achieved by a tracking error comparator with a single comparing threshold, and the time delta modulation is realized by a timer of carrier frequency. The lower and upper limit of actual output currents are decided by setting the lower threshold of a hysteresis comparator and the timing period of a timer respectively, The tracking error comparator makes faster response and higher tracking accuracy, and especially the timer ensure an exactly constant carrier frequency. Theoretical analysis is done and the corresponding results to avoid tracking lose step are given. Simulation and experiment results demonstrated the better tracking control properties.更多还原