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Supporting your IoT system construction
Securing Power with Energy Harvesting Technology
Collecting power supply is important to IoT system.
However, replacing/charging battery can be difficult depending on the design, or the location where it is placed.
One possible way to supply power is using the energy harvesting technology.*
* Energy harvesting technology: A technology to harvest or scavenge rarefied energy exists in the environment such as light, vibration, and heat, and convert it into power.
Ricoh's buck DC/DC converter for a photovoltaic and vibration energy harvesting achieves a nano-watt-order low electromotive force. This product is suitable when the power supplied from harvester is very low.
Incorporating our low electromotive power management IC and the energy harvesting module supplied by the harvester which needs electromotive efficiency such as DSSC and OPV* enables a power extraction under an environment where illuminance is low.
*DSSC: Dye Sensitized Solar Cell, OPV: Organic Photovoltaics. They have been attracting attention as new batteries for energy harvesting. Their benefits are lightweight, easily formed into various shapes, and low cost. However, the efficiency of electromotive is limited comparing to the polysilicon type photovoltaic cell.
Inputting the following parameters enables to calculate the startup illuminance.*
Illuminance (lux) as a reference
The R1800 is a power-storing buck DC/DC converter for a photovoltaic and vibration energy harvester. It achieves a minimum starting power of 720 nW, one of the top electromotive force level in the industry, while having an ultra-low quiescent current of 144 nA (Typ.) at no load and normal temperature. It also provides a high efficiency of 90% at a light load with 10 µA output current. The maximum power control, which utilizes the harvester capability, optimizes a power supply from an energy harvester. The reverse current protection provides highly efficient power extraction with the lossless charge saved in the power storage element even if there is no supply of power from the energy harvester.
*1: Researched by Ricoh as of December 2017.
We highly recommend our power management IC that supports the power extracting of your IoT devices for energy harvesting with low electromotive force.
|Product Name||Function||IQ||VIN||Minimum Starting Power|
|R1800||Buck DC/DC Converter||144 nA||2.0 V to 5.5 V||0.72 µW|
|R1801||Buck DC/DC Converter with Adjustable Maximum Power Point Control, Adjustable Output Voltage and PG Function||200 nA||2.3 V to 5.5 V||1.00 µW|
|R1810||Boost DC/DC Converter with PG Function||600 nA||0.35 V to 2.1 V||9.0 µW|
IQ: Operating Quiescent Current