I have an NB-IOT Transmitter which sleeps most of the time, but one a day wakes up and transmits a file over FTP to my web server. My device runs on 3.7V and needs at least 1A for very short bursts during tranmissions.
I wish to use the following power supply:
- 5.5V, 200mA Solar Panel
- 2.7V 100F - 500F Super Capacitor, which will be charged via the above solar panel
- 2.7V to 3.7V DC-DC Up Converter, which will be connected to the Super Capacitor
- A non-Rechargable 3.7V Battery
I wish my IoT device to use the power from the Super Capacitor, unless its depleted, in which case it will use power from the non-rechargable battery.
The building blocks seems to be
- Current Limiting Super Cap Charger, between solar panel and the super capacitor
- DC-DC convertor to take the 2.7V from the Super Cap to the required 3.7V
- Some kind of switch to decide if power comes from 6) or from the non-rechargable battery.
The device is a remote monitoring sensor.
I have searched everywhere to find a circuit that comes close to what I want to do, but can't find it, so am hoping to get some pointers here. How can I do what I want to?