AJBotha
Newbie level 6
Hi Guys
I recently had a product that I designed tested at an EMC lab and at first it failed the conducted emissions test.
The PCB is very size constrained and I am looking for the most cost and size effective solution that cures the problem.
I replaced the polarity protection diode D1 with a 220uH inductor that I had on hand, and the PCB then passed,
but it was marginal, with the first spike almost exceeding the allowed value.
The issue was of course at the switching frequency, 500kHz. The first spike was at 500kHz and exceeded the limit.
The harmonics, all clearly vissible, was withing limit.
Should I leave it as it passed, should I implement a PI filter, or/and increase the inductance to increase the resistance to higher frequencies?
The plot is the plot of the modded PCB including the inductor, sorry for the bad quality, its the best I have atm.
Advice would be greatly appreciated! Thanks
**broken link removed**
**broken link removed**
I recently had a product that I designed tested at an EMC lab and at first it failed the conducted emissions test.
The PCB is very size constrained and I am looking for the most cost and size effective solution that cures the problem.
I replaced the polarity protection diode D1 with a 220uH inductor that I had on hand, and the PCB then passed,
but it was marginal, with the first spike almost exceeding the allowed value.
The issue was of course at the switching frequency, 500kHz. The first spike was at 500kHz and exceeded the limit.
The harmonics, all clearly vissible, was withing limit.
Should I leave it as it passed, should I implement a PI filter, or/and increase the inductance to increase the resistance to higher frequencies?
The plot is the plot of the modded PCB including the inductor, sorry for the bad quality, its the best I have atm.
Advice would be greatly appreciated! Thanks
**broken link removed**
**broken link removed**