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Shown on this and the following slide are some useful terms in discussing energy harvesting. The first term is energy harvesting itself. This is the process of capturing and converting tiny amounts of energy, for example energy from light, vibration, or heat, into electricity. An energy harvesting Power Management IC, or PMIC Is an IC that converts intermittent harvested power to stable power, with low start-up power and low quiescent current. An energy harvesting device harvests energy, for example from solar cells which harvest light, piezoelectric and electromagnetic induction devices which harvest energy from vibration, and thermoelectric generators which harvest energy from heat. An energy storage device retains energy, and features low leakage and low impedance. Capacitors are commonly used for harvested energy storage. For example, ceramic tantalum, aluminum electrolytic, or electric double layer capacitors are often used for this purpose. An energy harvesting system, EHS, is a system used to deliver power to a wireless sensor node, or other lower power system, which includes an energy harvesting device, a PMIC for energy conversion, and an energy storage device. Shown in the diagram is the relationship between the different components in an energy harvesting system. Starting with the energy source, feeding in an energy harvesting device, then into an energy harvesting PMIC, and finally into an energy storage device. The energy harvesting system then provides power to the system represented here by the EHS load. This example shows weather station where temperature, humidity, and pressure might be sensed and that data is transmitted over an RF signal.
