SPV1050 Charging Problem

Bard48 · ‎2025-10-15

Hello,

I designed a circuit, but there is a problem with it. My supercapacitor (C5) is charging very slowly. I am using Dracula's standard OPV. It receives an average of 500 lux. It is charging so slowly that it is almost not charging at all. What could be the problem?

Thank you.

Peter BENSCH · ‎2025-10-15

Welcome @Bard48, to the community!

First, I would check the electrical parameters or characteristic curve of the OPV (organic voltaic cell), as we do not have this data for 500lx).

Regards
/Peter

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Bard48 · ‎2025-10-15

Thank you for your response.

OPV specifications: In 500 lux; Voc=3,67V, Isc=190uA, Vm=2,95V, Im=162mA, Pm=478uA

I can see that it charges very slightly. When I connect a 50mA load, the 3.3V LDO in the system disables. As far as I understand, even though my supercapacitor has sufficient charge, the Internal Pass Transistor disconnects the connection.

What could be the problem?

Thank you.