Vibration Energy Harvester for Converting Mechanical Vibrational Energy into Electrical Energy
First Claim
1. A vibration energy harvester for converting mechanical vibrational energy into electrical energy, the vibration energy harvester comprising a device for generating electrical energy when subjected to mechanical vibration, and a current control circuit electrically connected to the device for providing a substantially constant output current at an electrical output of the vibration energy harvester.
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Abstract
A vibration energy harvester for converting mechanical vibrational energy into electrical energy, the vibration energy harvester comprising a device for generating electrical energy when subjected to mechanical vibration, and a current control circuit electrically connected to the device for providing a substantially constant output current at an electrical output of the vibration energy harvester.
31 Citations
20 Claims
- 1. A vibration energy harvester for converting mechanical vibrational energy into electrical energy, the vibration energy harvester comprising a device for generating electrical energy when subjected to mechanical vibration, and a current control circuit electrically connected to the device for providing a substantially constant output current at an electrical output of the vibration energy harvester.
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12. A method of operating a vibration energy harvester for converting mechanical vibrational energy into electrical energy, the method comprising the steps of:
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a. providing on a vibratable support a device for generating electrical energy when subjected to mechanical vibration, and b. using a current control circuit electrically connected to the device for providing a substantially constant output current at an electrical output of the vibration energy harvester when the device is vibrated. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A vibration energy harvester for converting mechanical vibrational energy into electrical energy, the vibration energy harvester comprising an electromechanical generator for generating electrical energy when subjected to mechanical vibration, and a current control circuit electrically connected to the device for providing a substantially constant output current at an electrical output of the vibration energy harvester, the current control circuit comprising a first controllable variable resistance connected to the electrical output of the vibration energy harvester, the first controllable variable resistance being selected from the group consisting of a MOSFET and a bipolar junction transistor, a reference voltage generator for generating a preset reference voltage, and an error amplifier for comparing an input voltage from the device with the reference voltage for generating a first control signal for selectively adjusting the first controllable variable resistance when the input voltage is different from the reference voltage.
Specification