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How do you calculate the power consumption of my board?

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samsoun

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Hello

I need to estimate the power consumption of my PCB, I used some capacior, Inductor and diodes

pls help me out :)
 

You need to be more specific, it could be from almost zero to infinitely high depending on how you have them connected. Can you post a schematic?

Brian.
 

Thanks :)
There is the schematic

4168101700_1406498657.png
 

I didnt have muttimeter :/, There are any formula I calculate it??
 

Yes of course there is but the formula would be very complicated.

I would suggest the simplest method (which ignores phase shifts and residual capacitances/inductances but will give a reasonably accurate result) is to convert it to a resistor model and treat the antenna voltage, assuming that is the input, as DC. In reality it will be very frequency dependent.

So do this:

1. convert all the capacitors to equivalent resistances using the formula:
1/(2 * pi * f * C)

2. convert all the inductances to equivalent resistances using the formula:
2 * pi * f * L

3. for the diodes, subtract Vf from the voltage across them and calculate the power loss as Vf * I

Use the resistor as it is. The power loss in it is (V * V)/R

In the calculation, f is the frequency in Hz, C is in Farads, L is in Henries and R is in Ohms. When you have converted everything to it's equivalent resistance and calculated the total across the source, the power consumption is (source voltage * source voltage)/ total resistance.

As I said, the calculation is quite complex and will be inaccurate unless you also take into account the phase shifts and shape of the input waveform.

Brian.
 
You can use a circuit simulation software. There are many spice-based software that are freeware.
 

Can you gives me any website that can help me!!!
 

If you are refertng to a website related to simulation software you can search LTSPICE, microcap, orcad; this last two have evaluation version which require registration
 

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