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For a project, i would like to power a li-ion battery from a TEG. For that, i use a step-up converter called LTC3109 developed by linear technology but it was limited in current. I intend to create a system with supercapacitors storing energy and after releasing all to charge the battery. Is it a good idea?

my system

thank you in advance for your help. And sorry for my English.

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  • \$\begingroup\$ The LTC3109 won't cold start from 30 mV. \$\endgroup\$ – Andy aka May 16 '17 at 11:39
  • \$\begingroup\$ And exactly how much current can you TEG provide? \$\endgroup\$ – R Drast May 16 '17 at 12:42
  • \$\begingroup\$ The starting of LTC3109 isn't a problem. I 've a good gradient. Exactly, Short-circuit current is 0.424mA \$\endgroup\$ – Dipo May 16 '17 at 14:02
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Adding the super capacitors will result in extra losses as it is just an extra step in the process. You would also need to add a second circuit to control the charging process of your battery (whereas, when you go directly to the battery you can try and include that in your first step-up convertor). Charging the battery more slowly (in theory) also results in higher efficiency as you loos less energy to ohmic losses and the ESR of the battery.

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  • \$\begingroup\$ Ok. Even if i use a circuit to control to control the charging process of your battery, the problem is the same isn't it ? My circuit delivers 30mA and consumes 300mA. \$\endgroup\$ – Dipo May 16 '17 at 14:18

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