基于TI F280049的宽频高动态数字锁相环实验研究

Research on Wide-Frequency and High Dynamic Digital Phase-Locked Loop Experiment Based on TI F280049

摘要: 在发电机控制、高频感应加热和电源并联等应用场合中，由锁相环检出的电压幅值、频率和相位变化直接影响系统稳定性。针对现有锁相环动态响应不足、锁频范围较窄的问题，该文提出了一种适用于宽频范围的快速锁相环，在阐述锁相和锁频原理的基础上，将锁频环输出的角频率作为环路滤波器输出的前馈项，以提高锁相环的响应速度，并对其二阶广义积分器这类二阶系统设计了IIR滤波器等效的通用数字实现方法，且通过具体实验验证了所设计方法的有效性。该实验可加深学生对数字信号处理的认识和理解，并培养学生将控制理论或数学知识转化为数字实现的能力。

Abstract: The voltage amplitude, frequency, and phase gained by a phase-locked loop directly affects system stability under generator control, high-frequency induction heating, and parallel operation of the power supply. A rapid phase-locked loop with a wide frequency range is proposed to aim at the problems of lower dynamic response and a narrower frequency range. The center frequency of frequency-locked loop is added to the feed-forward term of loop filter to speed the response of the phase-locked loop based on the theory of phase lock and frequency lock. The equivalent and general digitization method between the second-order generalized integrator and IIR filter is designed. Finally, the effectiveness of the designed method is verified by experiments. This experiment can make students know and understand digital signal processing and train their abilities to realize control theory and mathematical knowledge by the digital process.