多频点调频发射机的设计与制作

以高效功率开关器件MOSFET为核心器件,使用信号输入、音频放大、载波产生、调频、调频波发射等电路,实现了可预置多个频率点的调频发射机。该调频发射机可以应用于微型电台、远程听课或报告、婴儿、老人监护等。实际测试表明其具有一定的实用性。     

基于公用电话网络的单片机控制家电系统设计

基于公用电话网络的远程控制系统以51系列单片机和MT8870双音多频解码集成电路为核心,通过电话实现对远程设备智能化控制,模拟主人在家场景及用户留言功能。使用该装置,客户在世界各地随时都能实现对家电开关远程控制,且设备成本低,具有较高的实用价值。     

Proportional integral plus multi-frequency resonant current controller for grid-connected voltage source converter under imbalanced and distorted supply voltage conditions

This paper proposes a current control scheme for a grid-connected pulse width modulator （PWM） voltage source converter （GC-VSC） under imbalanced and distorted supply voltage conditions. The control scheme is implemented in the positive synchronously rotating reference frame and composed of a single proportional integral （PI） regulator and multi-frequency resonant controllers tuned at the frequencies of 2ω and 6ω, respectively. The experimental results, with the target of eliminating the active power oscillations and current harmonics on a prototype GC-VSC system, validate the feasibility of the proposed current control scheme during supply voltage imbalance and distortion.