is there a photo voltaic power source component for multisim 11?

[WillowWays2]

i am looking for a component for a photovoltaic cell source.does multisim 11 have anything like this.

[Tien_P]

Multisim doesn't have a photovoltaic cell, there are only generic power sources. Are you trying to model a specific behavior of a photo cell?

[WillowWays2]

yes i am trying to simulate 6 photo cells on series with a LED and resistor.

[Tien_P]

I am not familiar with the characteristic of a photo cells so these are just general info that I think you may find useful. 

There is a "Piecewise linear voltage"  source in the "Source" database, this component allows you to enter time vs. voltage in table and you can sure this in a voltage source to driver a circuit.

You can generate a non-linear source by using the Anolog Bahavoir model (ABM) by inserting math equations.  I can give you more information about this if you tell me the math equation.

A photo cell is just a voltage generator and you should be able to emulate the cell behavior with a voltage source.

[WillowWays2]

the best explination of the curcuit equivalent of a photo(solar cell) seems to be found in wiki

solar cell perameters to out put current and voltage

I = output current (amperes)

I_L = photogenerated current (amperes)

V = voltage across the output terminals (volts)

R_S = series resistance (Ω).

I₀ = reverse saturation current (amperes)

n = diode ideality factor (1 for an ideal diode)

q = elementary charge

k = Boltzmann's constant

T = absolute temperature

R_SH = shunt resistance (Ω)

then the edffected based on physical size of the cell

J = current density (amperes/cm²) 

J_L = photogenerated current density (amperes/cm²) 

J₀ = reverse saturation current density (amperes/cm²) 

r_S = specific series resistance (Ω-cm²) 

r_SH = specific shunt resistance (Ω-cm²).

not sure if this helps i will check with my professor on this matter as well.

[MrPV]

How can I implement a voltage source with the following (I=current dependent) behaviour?
U = ( 100 * LN ( ( 1600 - I + 0.18177723) / 0.18177723 ) ) - ( I * 0.00000043)
Thank you.

[Tien_P]

Hi MrPV,

Please have a look at the attached example.  I used a Current Controlled Voltage Source(CCVS) to convert current to voltage to make it easier to work with, next use an ABM source to read the voltage from the CCVS node 2. 

You can have a look at this knowledge base to learn more about the ABM source.

http://www.ni.com/white-paper/5632/en

[123abhu]

Will that attached model of ABM source emulates solar cell equation given in above equation??? 

[Tien_P]

Hi 123Abhu,

I am not familiar with the expression from the ealier post, but the ABM source is a component that can read a voltage somewhere in your circuit and apply that value to an expression to give you a new voltage.

[MrPV]

Yes, but the problem was the calculation accuracy due to the "LN" - function. So sometimes the UI-"operating-area" of the PV generator was not met.
Recently I saw an example from NI with LV & MS - Co-Simulation where the PV source in LabViev is implemented - I think this is the better way 😉