st8500可否用在直流140v电缆上进行通信

[闰土]

st8500+stld1的方式进行调制解调与放大信号，然后通过高压薄膜电容耦合在直流DC140供电的线缆上进行通信，这样做是否可行，还有没有更好的方案与建议，谢谢

[Didier HERROUIN]

Dear Visitor,

Yes, this is feasible, the PLC design based on ST8500+STLD1 works on AC and DC networks.
You can optimize the coupling to the powered cable, meaning that the coupling capacitor and the transformer can be adapted to your DC network characteristics as you do not have the same constraints as in an AC network.

[闰土]

您好，请问有没有用电容耦合直流电缆的电路推荐或者设计有什么需要注意的地方？stld1出来是差分信号，两个差分信号分别直接通过电容去耦合在直流线缆的140v和140vGND上对吗

[Didier HERROUIN · Accepted solution]

Dear Visitor,

For optimal performances, you can keep the differential mode with a transformer as in the AC design.

You can also connect the STLD1 in single ended mode, removing the transformer : only PA1_OUT signals are connected to the coupling circuit. The coupling circuit being the capacitance (in series with a coil, depending on your resonant frequency bandwidth) + protection diodes. PA2_OUT stay not connected.

[闰土]

您好，你上一条回复说的是单端方式，如果继续使用差分方式可以吗，PA1_OUT和PA2_OUT分别通过电容耦合在线缆的140v和140v的GND上，再通过st8500的接收端进行接收，然后再做一些tvs防护和共模扼流圈