低压电力线载波通信的接口电路设计

为了利用低压电力线实现可靠的载波通信,接口电路的设计是问题的关键。其难点在于:一方面,要求载波信号的加载效率高;另一方面,要求电力网50Hz的工频信号不能给载波通信系统带来太大的干扰。为此,采用了"电磁耦合"与"阻容耦合"相结合的"复合耦合技术",很好地解决了这一难题。基于这种"复合耦合技术",分析并设计了"低压电力线载波通信的接口电路"。仿真结果和实验结果表明:该接口电路既有较高的载波信号加载效率,又能完全地隔离电力网50Hz的工频信号。因此,该接口电路可广泛应用于低压电力线通信系统。

Design of the Interface Circuit of Communication with Low-Voltage Power Line

In the interest of realizing carrier communication using LVPL, it is a sticking point to design the interface circuit of the communication. The difficulty is: one side,higher efficiency of loading carrier signals is demanded;on the other hand,very little disturbs from LVPL are required.So,the "complex-coupling-technology"of combining"electromagnetism-coupling"to"RC-coupling"is used to solve the difficulty. Based on the"complex-coupling-technology",the interface circuit of the communicationusing LVPL is analysed and designed. Simulation and experimentation results show that the interface circuit not only has higher efficiency of loading carrier signals but also can completely close off 50Hz signal from LVPL. Therefore, the interface circuit can apply to communication systems on LVPL.