Recent content by sodoyle

Looking at it from the time constant point of view it looks like the resistance would need to decrease proportionally to the increase in capacitance. In other words, if I have 4 capacitors in parallel, the balancing resistors would need to be 4x lower than the value with no parallel caps...

Did you ever get this figured out? I've had the same problem and don't know why.

I am going to have several series/parallel capacitors so need balancing resistors. I understand that for series capacitors, it is wise to use voltage balancing resistors so mismatch in individual series capacitors leakage current can flow through the resistors which prevents individual...

I've never heard of it as "soft commutation" just because of the diode. The anti-parallel diode is used in a lot converters with "soft commutation" though. That's largely because the schottky diode is often a better diode than the FET's body diode. Some type of diode is needed, body or...

It's just possible to get a higher efficiency with synchronous. Of course that comes at the cost of increased control complexity and an extra FET so it's really just a matter of playing the tradeoff game. Here's a few open access paper discussing soft switching in synchronous converters...

For a synchronous buck converter, does soft switching have to be implemented? I assume there will be some ringing if not. If soft switching is required/recommended, can it be implemented on just one of the switches to simplify control and still have most of the benefit?

Thanks, that's exactly what I was looking for. Even though C0G is a temperature coefficient, it's also interesting that they're have a lot flatter CV curve.

What type of ceramic is an NP0 capacitor made from? I know X7R is barium titanite, but I can't find NP0.

I will be using MPPT in the future, but for this I need to these equations to estimate the power available in the system under various conditions. I plan to use Perturb & Observe for the MPPT I think should be fairly straight forward. It won't need to differentiate between local and global maximums.

Yes, at the end of the day I would like to vary irradiation and temperature of the module while operating to analyze the systems performance. The method used in this paper may be good enough. I didn't see where they calculated the ideality factor which would effect the roll off so maybe they...

I want a software function. I can start with some guestimates and iterate in Spice until I get a close enough fit. I as just hoping to find a more analytical approach to obtaining a good fit. Any ideas on how to obtain I0? That's just property of the cell material itself isn't it?

I found a paper that provides an equation to estimate Rs and Rp based on Voc, Isc, Vmp, and Imp. I try using the values they provide for these parameters in a table but I do not get the same results. That means I'm interpreting the equations wrong, but I'm not sure how. A link to the article and...

Yes, that is what I want to generate. For that, my thought is that I would use the single diode equation which includes series resistance (Rs) and parallel resistance (Rp). I'm not sure how to determine Rs and Rp though.

I am looking at a solar panel and would like to be able to plot the IV curve for it. I have Isc, Voc, Imp, and Vmp from the datasheet so I can get the fill factor. I know each cells dimension and the number of cells too so I can find the current density if required. Is there a way to use the...

I don't have an exact accuracy as of now (<5% difference). That's an interesting idea to measure the voltage but I already have a voltage sensor. I may be able to modify it by removing some of the unused signal conditioning circuits but I'm mainly trying to power what I already have. It would be...