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pic inside a power line inverter!

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UroBoros

UroBoros

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Hello,
I am planning to do a small add on card on A power line inverter of 1KVA. The purpose is to add a LCD Display.Should I expect any abnormal behavier from the part of PIC because of high current switching inside the box of inverter. If So, what are the prequotions I should or I can take?

Picstudent
 

There should be no problems. Make sure there are no ground loops. Use a seperate return path for the add-on section.

bimbla.
 

Picstudent,

caution, because often the power ground for electronic is live(connected to neutral or 120V), so when you make some testing don't use instrument with a connected electric ground.
 

You will be using 12V or 24V DC in the primary section of your inverter and if you have access to a scope, you will be able to find 50 or 60hz noise pulses in the primary section. This noise is much higher and contains several multiples of harmonics of 50 or 60hz if your inverter output is square wave. You will need a good power supply filter to your add on PIC circuit or a DC-DC converter to isolate the power supply and noise.
 

I would go the DC-DC converter route,I have used them,they work well and are not too expensive also they are nice and compact.
 

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