I'm planning on building a single cell AA NiMH battery charger and in the process I decided that I must also build a battery simulator to help me debug the charger. In my research, the best simulator circuit I came across was the one described in the Linear Technologies Application Note 58, Appendix B (page 35), which relevant part of its schematic is below.
In the circuit description, the AN says:
R10 and C5 simulate the AC characteristics of the battery.
Well, I have no idea what that means. I did search the net for a description but couldn't find anything useful.
So, my questions are:
- What exactly are the AC characteristics of a battery?
- Are there AC characteristics that are particular to NiMH cells?
- Out of curiosity, what happens if I don't add those components to my simulator?