I explained in detail how to create a system that uses electric double layer capacitors (EDLC, supercapacitors) like rechargeable batteries.
table of contents
00:00 1. The purpose of this video
00:42　2． Comparison of capacitors and rechargeable batteries
01:06 3. Features of capacitors
03:57 4. Structure of capacitor
06:38 5. Capacitor energy comparison
08:25 6. Comparison of discharge characteristics of batteries and capacitors
10:15 7. Fabrication of PFM boost converter
15:25 8. Production of overvoltage prevention circuit
19:08 9. Production of overcurrent prevention circuit
20:55　10． Supercapacitor rechargeable battery system
22:37　11. electronic mainspring
23:11　12. Experiment failure video
When using EDLC in an electronic circuit instead of a battery, the voltage changes greatly, so a circuit to keep the voltage constant is required.
A large current flows when charging the EDLC. The withstand voltage is low at around 2.5V. For these reasons, special measures are required to charge with an AC adapter.
The production of the overvoltage prevention circuit and overcurrent prevention circuit introduced in the video is not necessary if you have a constant voltage power supply that can shift to constant current operation. I also made a switching type constant current constant voltage power supply circuit, but the circuit is a bit complicated so I gave up on showing it in a video. We will create a production video if requested.
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The energy stored in a 120F EDLC is about one-tenth that of Daiso or Seria's AAA nickel metal hydride, which is not a lot, but if you charge it with this circuit for about 10 minutes before use, it can run for about 2 hours. It will be. It may be said that it is a new style of rechargeable battery. (If fast charging is possible, charging will be completed in no time)
P.S. “Things to check after posting a video”
1. Improving radio sound quality
As a result of inserting a filter into the output of the PFM D/D converter using a 330μH coil and a 470μF capacitor, there is no output noise, the slight noise that was present in AM radio disappears, and the sound quality is comparable to that of batteries. Became.
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2. Leakage current of electric double layer capacitor
According to calculations, a radio that operates for 2 hours becomes inaudible after about 1 hour and 20 minutes. The cause was that when a 120F capacitor was charged to 2.4V and left unattended, the voltage dropped to 1.8V after 2 hours. Maybe the capacitor I bought a long time ago has inferior performance compared to the one I have now? .
3.120F specification table
Rated voltage 2.5V Surge voltage 2.7V
Rated current: 18.75A Maximum current: 37.50A
VOICEVOX: Shuji Susumatsu
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