I made a power meter with ade7753 and everything woeks well. Circuit has been attached. Power supply is isolated as you see on circuit diagram
When I measuring an inductive load (like a motor,fan) and when I unplugged the load the data has been crashed and I after the IC has been reset by software everything goes well again. How can I solve this problem?
My assumptions and some tries:
IF you face with this issue please help me....
Please connect the ground on the bottom as indicated. You can solder copper tape or solder wick across the gnds to test. This should help with your problem.
For low freq performance the split you have is fine but for emc high freq transients this is bad. You are getting a voltage difference on each side of the gnd tie and this is causing either a power on reset or the reset pin is moving and resetting the part.
Please let me know how this works.
I've done what you said. Redesign my PCB and put a uniqe ground. But nothing happend and the problem exists yet!
Problem: When a inductive load connect and disconnect from the meter ,sometimes the ADE will crash and I must restart the ADE to back to normal
Please attach a clean schematic and layout. You can send to me by email for better detail.
The inductive load should not have an effect on our part if the input to the adc are within the specified range. You could remove the anti-alias resistors to remove the signals to the ADC for a test. Does the reset stop?
Please verify the iso power is not failing with an inductive and your are not getting a reset to the ADE.
Actually I Just edited the ground plane and all things are the same as the schematic I sent in my first post.
About ISO power: I see some high frequency spikes on power supply on oscilloscope when I switch inductive load On and Off. I guess that these spikes put the ADE in a unknown mode or sometimes restart that by restarting and then reconfiguring the registers again the chip will back to normal. I think by eliminating or preventing the propagation of this spikes to ISO power rail, the ADE chip will be immune and works well.
Now my question is how to do this? How can I filter out this spikes?
From what I can see you have no decoupling on the isopower module. Add a 10uf to 47uf cap and a .1uf (just random cap values I pulled out of thin air. look up the module and see what caps the module requires)at the output of the isopower module. The decoupling on your isolators could also be improved. see the manufactures recommended decoupling.