Search - frequency tracking loop

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[Software Engineering] ACarrierTrackingAlgorithmBasedOnFPLL DL : 0: 介绍了一种基于锁频锁相环(FPLL)的载波跟踪算法。频率跟踪模块可以适应较大动态范围的频率变化，基于软件的数控振荡器(NCO)模块可以达到极高的频率跟踪精度。由于有锁频环的频率牵引，锁相环路滤波器可以设计得很窄，具有很好的抑噪性能，满足精确跟踪载波相位的要求。因此，该基于FPLL的载波跟踪算法可以适应信号存在较大的动态范围和噪声干扰的应用环境；同时，其鉴频鉴相算法表达式简单，易于用可编程数字器件实现。-Introduce an approach based on frequency-locking phase-locked loop (FPLL) carrier tracking algorithm. Frequency tracking module can adapt to a larger dynamic range of the frequency change, software-based numerical control oscillator (NCO) module can achieve the very high frequency tracking accuracy. Because of the frequency lock loop traction PLL filter can be designed very narrow, with very good noise suppression performance, to meet the precise requirements of carrier phase tracking. Therefore, the FPLL carrier-based tracking algorithm can be adapted to signal the existence of a larger dynamic range and noise of the application environment at the same time, the PFD algorithm expression is simple, easy to use programmable digital devices.
Date : 2025-12-23 Size : 159kb User : 何宁
[Software Engineering] photovoltaic-grid-connected-system DL : 0: 光伏并网系统以MSP430F169 单片机为核心，单片机输出SPWM 波形经IR2110驱动H桥，实现DC-AC 逆变。最大功率点跟（MPPT）绝对误差小于1 ，利用430单片机软件实现锁相环，用参考频率作为基准频率，对MSP430单片机的外中断和定时器测定相位，当反馈的电压信号相位滞后（超前）于参考信号的相位时，就增大（减小）SPWM的频率；达到相位和频率同步。包括阻性负载，以及非阻性负载，实现了频率跟踪，相位跟踪。DC-AC 转换效率达88 ，人机接口LCD液晶显示器，界面直观、简洁，显示输出电压、电流，具有良好的人机交互性能。-Photovoltaic (pv) grid system to MSP430F169 microcontroller as the core, the microcontroller output SPWM waveform by IR2110 driver H bridge, realize DC- AC inverter. Maximum power point (MPPT) with absolute error less than 1 , using 430 single chip microcomputer software phase-locked loop, with the reference frequency as a benchmark, external interrupt and timer of MSP430 single chip microcomputer phase, when the voltage feedback signal phase lag (advanced) in the phase of reference signal, will increase (decrease) of SPWM frequency To achieve phase and frequency synchronization. Including impedance load, as well as non resistance load, has realized the frequency tracking and phase tracking. DC- AC conversion efficiency up to 88 , and the man-machine interface LCD liquid crystal display, intuitive interface, concise, shows that the output voltage, current, has the good man-machine interactive performance.
Date : 2025-12-23 Size : 372kb User : Tim Denve