Sol Chip Energy Harvester is a unique Photo Voltaic (PV) cell which produces six selectable voltage levels: 0.75 volt, 1.5 volt, 2.25 volt, 3 volt, 4.5 volt, 9 volt.
Each selectable voltage delivers different current.
The maximum power which can be extracted in full daylight is ~3.3 mWatt and in office lighting the power extracted is
up to 20 μWatt, dependent on ambient lighting intensity.
Additional voltage levels and also several voltage and power levels can be delivered simultaneously from separate pins of the device.
|ISC(1) at full daylight:||7 mAmp|
|Pmax at full daylight:||3.3 mWatt|
|Pmax at office light(2):||up to 20 μWatt|
|(1) For the case of Voc=0.75v.
(2) Depends on light conditions
System Schematic Diagram
System schematic diagram: Example 1 - no system battery
With System Primary Battery
System schematic diagram: Example 2 – with system primary battery
Advantage:Dual Charge Storage: When Load current < PV current, the Storage Cap 1 is charged and enables charge buffering. This will increase the energy efficiency.
1. Vbat defines Load voltage – Vload tracks Vbat voltage drop
2. Vload = Vbat-0.7v
3. During light condition, Ibat is not 0 Ampere.
PV supplies current Ipv to load & Storage Cap 2 @
Ibat = Ipv / beta