Electronics > Projects, Designs, and Technical Stuff
Supercapacitor charging methods from 0 V.
station240:
--- Quote from: drummerdimitri on February 26, 2018, 03:14:55 pm ---So I tried using my 500W 0.2 Ohm resistor bank and although it worked, the charging time is still quite slow since the current draw decreases rapidly as the charge of the capacitors goes up.
I am now convinced I need a CC power source that switches to a CV algorithm midway to get the fast charging I need.
--- End quote ---
Have you tried using a contactor to bypass the charge 0.2ohm resistor once you reach a certain voltage.
drummerdimitri:
--- Quote from: station240 on March 02, 2018, 03:52:04 am ---
--- Quote from: drummerdimitri on February 26, 2018, 03:14:55 pm ---So I tried using my 500W 0.2 Ohm resistor bank and although it worked, the charging time is still quite slow since the current draw decreases rapidly as the charge of the capacitors goes up.
I am now convinced I need a CC power source that switches to a CV algorithm midway to get the fast charging I need.
--- End quote ---
Have you tried using a contactor to bypass the charge 0.2ohm resistor once you reach a certain voltage.
--- End quote ---
No since I don't know how to make that work...
Ideally some kind of voltage regulated automatically variable high powered resistor would be perfect for this. It would start out at 0.2 Ohms of resistance and slowly decrease it's resistance in a way that more of the power supply's power can be dumped into the supercaps. Not sure if such a thing exists!
Bendba:
Automotive light bulb in series? Relatively high resistance when high current goes through, resistance drops when it get close to charged. Just choose the wattage depending on your charging rate.
ogden:
--- Quote from: drummerdimitri on March 02, 2018, 09:33:14 am ---Ideally some kind of voltage regulated automatically variable high powered resistor would be perfect for this. It would start out at 0.2 Ohms of resistance and slowly decrease it's resistance in a way that more of the power supply's power can be dumped into the supercaps. Not sure if such a thing exists!
--- End quote ---
Simpler and much more effective solution is "generic" supercapacitor charger which is based on buck converter. Instead of inventing exotic chargers, better look at supercapacitor as high current battery with discharge voltage equal to 0V.
drummerdimitri:
I found a 600 W power supply capable to delivering a constant 50A to the bank from 0V and starts dropping when the bank's voltage near 14V.
I am now capable of charging them in under 2 minutes!
Model is a Mean Well PSP-600-12.
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