Energy harvesting apparatus

An energy harvesting apparatus comprising:

• a housing divided into a flow space and a power generation space;
• a rotatable shaft in the housing and extending into the flow space and the power generation space;
• a blade in the flow space coupled to the rotatable shaft, the blade being configured to be rotated by flow of air in the flow space and configured to rotate the rotatable shaft in response to the blade rotating;
• and
• a power generation unit in the power generation space, wherein the power generation space in the housing is divided into a first space and a second space, and wherein the power generation unit comprises
• a power generation motor coupled to the rotatable shaft, the power generation motor being configured to convert power of the rotatable shaft into electrical energy,
• a piezoelectric power generator in the first space comprising piezoelectric elements, and
• a pressure generator comprising a guide member and a striking member, the striking member being movably coupled to the guide member, the striking member having striking protrusions extending therefrom, the guide member being coupled to the rotatable shaft and configured to be rotated by the rotatable shaft, the guide member extending into the first space and the second space, and the striking member being configured to move between the first space and the second space relative to the guide member, such that more of the striking protrusions are aligned with the piezoelectric power generator when the striking member is in the first space than when the striking member is moved into the second space, and wherein the striking protrusions are configured to strike the piezoelectric power generator so that the piezoelectric elements of the piezoelectric power generator convert impact energy into electrical energy.