External Energy: External energy that is in a form of pressure or vibration is applied into the piezoelectric element where it can be converted into electrical energy.
Energy Conversion: The energy from the piezoelectric element must then being converted from Alternating Current (AC) into a stable Direct Current (DC) that the circuit can use.
Harvesting Circuit: In the harvesting circuit it may consist of a liner regulator that will regulate the output so that it can be integrated in any device that use a USB port to charge. In the harvesting circuit, it also may contain a battery that will store the energy if there’s no device connected to the output.
Load circuit: Load circuit is the device that this circuit connected to.