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cannot get expe cted result

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redsunwit 4 years ago

hello, I design a piece of circuit in the following first image in easyeda for simulation. the purpose is that i just want to get 72Khz signals from power line (AC power with 220-110v 60hz) but when i simulate is with AC analysis , i get the following second image. so sad, .... actually, i want to get the following third image. hope some one can help me. i am a freshman to do this. ![Screenshot from 2019-05-29 23-09-02.png](//image.easyeda.com/pullimage/VhYIbzWXSmZqxgKYtcYnWfynEOJPDTp53q4VqWfn.png) ![Screenshot from 2019-05-29 23-14-08.png](//image.easyeda.com/pullimage/8aXv6Sb62p1zryQ8fE9pY68KHXlvRdE2bRip6lpN.png) ![Screenshot from 2019-05-29 23-14-26.png](//image.easyeda.com/pullimage/TRwLxqcungGNSatsUZxVaP4TnrocKoceAjZ9MeWT.png)

Firefox 67.0 Ubuntu EasyEDA 6.1.49

Comments

andyfierman 4 years ago

Some of the plotting in WaveForm is not very good and needs to be improved but although the results that you get in EasyEDA for your coupler circuit: ![image.png](//image.easyeda.com/pullimage/6Our5AiruP9iTZaICV7euQe3oI6h202f7XO7xaYl.png) are not well plotted: ![image.png](//image.easyeda.com/pullimage/ZrkvJPBUlGvc6xGJqTkzQnSqApcDB3D29Fa8aBzI.png) but they are basically the same as in LTspice: ![image.png](//image.easyeda.com/pullimage/5GcMwwag0w1mwpAYi1Een2MNdnpGpeKacSnsoUZL.png) Even if you plot the magnitude linearly: ![image.png](//image.easyeda.com/pullimage/ntUhKoHtamQSVOhyNkxrUjsmcglWOGmh2rQMGtqk.png)

Chrome 74.0.3729.169 Windows 10 EasyEDA 6.1.49

redsunwit 4 years ago

Thanks a lot. i have a following question. how can i get the following result, which is from the internet. (AC Power is 220-110v, 50-60Hz. how can the following circuit just show us frequency around 72khz?) ![Screen Shot 2019-05-30 at 13.39.28.png](//image.easyeda.com/pullimage/4dtwRBelGXJsdcuHV5Jga1oIsaGnPaHTEd7HCuVV.png)

Chrome 74.0.3729.169 OS X 10_13_6 EasyEDA 6.1.49

redsunwit 4 years ago

hi all, i have figured it out. thanks a lot .

Chrome 74.0.3729.169 OS X 10_13_6 EasyEDA 6.1.49

andyfierman 4 years ago

@redsunwit, Where on the internet? Please post the link to it. I have already demonstrated that the Bode plot you have posted is not for the circuit you have posted. Where does the 11.5kV come from? How is the voltage source set up?

Chrome 73.0.3683.86 Ubuntu EasyEDA 6.1.49

redsunwit 4 years ago

@andyfierman Hello, thanks for continuing discussing and concerning. the link is as follows. I am sorry that I am a freshman about PCB design. after i try to add a transformer to the above circuit and simulate it in ltspice. i get the expected result (only 27khz signal is allowed). [http://www.candrian.gr/index.php/category/microcontrollers/avr/power-line-communication/](http://www.candrian.gr/index.php/category/microcontrollers/avr/power-line-communication/)

Chrome 74.0.3729.169 OS X 10_13_6 EasyEDA 6.1.49

redsunwit 4 years ago

@andyfierman I use ltspice to simulate the coupler in above website. and the result is as follows. when i use transformer with 1.4m, 1.4m for each inductor of transformer. the circuit can just allow 13khz rather than 27khz. ![Screenshot from 2019-05-31 15-29-47.png](//image.easyeda.com/pullimage/hLQvjpduNoykz2GfuabqzV3xJuCRUQmZeI0yf9H3.png)

Firefox 67.0 Ubuntu EasyEDA 6.1.49

andyfierman 4 years ago

@redsunwit, With all due respect, sorry but these are questions for the author of the web pages: [http://www.candrian.gr/index.php/category/microcontrollers/avr/power-line-communication/](http://www.candrian.gr/index.php/category/microcontrollers/avr/power-line-communication/)

Chrome 73.0.3683.86 Ubuntu EasyEDA 6.1.49

你现在访问的是EasyEDA海外版，使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程，下载后在https://lceda.cn/editor 打开保存即可。
有问题联系QQ 3001956291 不再提醒

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