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Method to Passively Charge a Portable Electronic Device Through Piezoelectric Charge Generation in a Protective Casing

IP.com Disclosure Number: IPCOM000240567D
Publication Date: 2015-Feb-09
Document File: 3 page(s) / 45K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method to charge a portable device through a fluid-filled protective case.

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This is the abbreviated version, containing approximately 80% of the total text.

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Method to Passively Charge a Portable Electronic Device Through Piezoelectric Charge Generation in a Protective Casing

This disclosure addresses passively charging portable electronic devices. Current solutions include incorporating piezoelectric elements under the touch screen of the device to generate a portion of energy back to the battery during screen interaction. The piezoelectric elements can also generate energy from the vibration of the device. The drawbacks to this solution is that the amount of energy that can be harvested from vibration is very small and does not provide enough energy to sustain the battery life for long periods of time.

    This disclosure utilizes a fluid chamber built into the portable electronic device or a protective casing that surrounds the device. The fluid chamber will be partially filled with fluid. Attached to the walls of the fluid chamber are piezoelectric elements. During movement of the device, the mass of the fluid will deflect the piezoelectric wires which will generate a current. This method is advantageous because the amount of deflection of the piezoelectric elements is greater as a result of the shearing forces provided by the fluid. The piezoelectric wires can then be connected directly to the battery through the case. This can be accomplished by attaching the wires to a printed circuit board in the fluid chamber and then connecting the output of the circuit board either directly to the battery or, more preferably,...