How do you calculate the power consumption of my board?

[samsoun]

Hello

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

pls help me out

 

[betwixt]

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.

 

[samsoun]

Thanks
There is the schematic

 

[horace1]

could you put a muttimeter in the power line to measure mAmps?

 

[samsoun]

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

 

[betwixt]

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.

 

[albbg]

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

 

[samsoun]

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

 

[albbg]

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