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Charging a capacitor with an external source (Thermometric generator, TEG) with BQ25504EVM

BEZAK
Intellectual 465 points

Hi,

Why when we charge a capacitor an external source (Thermometric generator) with BQ25504EVM the charge profile is a combination of linear graphs? I thought capacitors have exponential charge (Voltage vs Time). I did several tests and in each test, I can see the voltage across the capacitor reaches 0.6V and then the slop changes up to 1.2V and then again up to 3 V. It also takes years :) to charge 4 capacitors in series (capacitance of each: 32F), maximum voltage of each capacitor is 1 V. When I connect the TEG in parallel with 1 capacitor it only takes 2 min to charge the capacitor to a voltage that TEG has maximum output.

I put my experimental results to explain it better:

Thanks,

Bee