Energy harvesting for wireless sensor operation and data transmission
First Claim
1. An energy harvesting system, comprising:
- a wheel;
an energy harvesting circuit including a piezoelectric material, said energy harvesting circuit mounted on said wheel, wherein said energy harvesting circuit includes a reactive device having an impedance for storing energy derived from said piezoelectric material, wherein said impedance approximately matches impedance of said piezoelectric material, wherein said energy harvesting circuit further includes a low impedance high capacity storage device having a lower impedance and a higher capacity than said reactive device, wherein said low impedance high capacity storage device is switchably connected to receive charge from said reactive device; and
an energy using circuit connected to receive power derived from said energy harvesting circuit, said energy using circuit including a sensor and a transmitter, said transmitter for wirelessly transmitting sensor information.
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Accused Products
Abstract
A device for powering a load from an ambient source of energy is provided. The device includes an energy harvesting device for harvesting energy from the ambient source of energy wherein the rate energy is harvested from the ambient source of energy is below that required for directly powering the load. A storage device is connected to the energy harvesting device. The storage device receives electrical energy from the energy harvesting device and is for storing the electrical energy. A controller is connected to the storage device for monitoring the amount of electrical energy stored in the storage device and for switchably connecting the storage device to the load when the stored energy exceeds a first threshold. The system can be used for powering a sensor and for transmitting sensor data, such as tire pressure.
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Citations
27 Claims
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1. An energy harvesting system, comprising:
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a wheel; an energy harvesting circuit including a piezoelectric material, said energy harvesting circuit mounted on said wheel, wherein said energy harvesting circuit includes a reactive device having an impedance for storing energy derived from said piezoelectric material, wherein said impedance approximately matches impedance of said piezoelectric material, wherein said energy harvesting circuit further includes a low impedance high capacity storage device having a lower impedance and a higher capacity than said reactive device, wherein said low impedance high capacity storage device is switchably connected to receive charge from said reactive device; and an energy using circuit connected to receive power derived from said energy harvesting circuit, said energy using circuit including a sensor and a transmitter, said transmitter for wirelessly transmitting sensor information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An energy harvesting system, comprising:
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a substrate; an energy harvesting circuit, wherein said energy harvesting circuit includes a piezoelectric material, a first capacitance, a second capacitance, and a voltage conversion circuit, wherein said voltage conversion circuit is for converting a higher DC voltage to a lower DC voltage, wherein said piezoelectric material is mounted on said substrate, wherein said piezoelectric material has a piezoelectric material capacitance, wherein said second capacitance is about equal to said piezoelectric material capacitance, wherein said first capacitance is substantially larger than said piezoelectric material capacitance, wherein said voltage conversion circuit is switchably connected to provide charge from said second capacitance to said first capacitance; and an energy using circuit connected to receive power derived from said energy harvesting circuit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification