Want to know about ground isolation in power electronics any one will help?

Electronics work on DC supply and one of the leg of DC supply (Normally +ve terminal is made common) is connected to earth. This common terminal is at times not connected to earth and kept isolated. This is done so that this point remains floating. This is called ground isolation in power electronics.Want to know about ground isolation in power electronics any one will help?
I don't know what you mean really. But if you mean it dose not require an earth protection than it must have a low voltage or be completely in-cased so no conductive parts are exposedWant to know about ground isolation in power electronics any one will help?
Well, one interpretation of your question has to do with ground loops, and the steering of ground currents when you have switching circuits where very large transient currents flow in the return paths, which are a common node called ground. An example of this is in the design of switching power supply. In the physical layout of the circuitry on a PCB, it is very important to place the components which have very high transient loop currents such that:


1. The loop areas are minimized.


2. Use short, wide traces (on thick copper)


3. Avoid vias (they add loop inductance)


4. If you have to use vias, use enough of them, and use large vias.


5. Keep the quiet ground of the controller IC away from the high current ground. These two grounds must be connected together so that the large currents don't cause voltage drops within the ground path for the quiet ground, otherwise operation will be erratic.





A 2nd interpretation is simply ';floating grounds'; where the output voltage ground is completely isolated from the input power ground. This is done typically by using magnetic coupling via transformers. So power supplies can be divided into two types: Common return (ground) or Isolated return (ground).

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