Abstract
This paper presents an interface circuit with power control features for electrostatic vibration energy harvesting. A DC-DC convertor is used to control the output voltage of a diode-based charge pump circuit. Therefore, the maximum and minimum voltage across the variable capacitor of the energy harvester may be adjusted to track the maximum power point of the system. The power conversion function of the DC-DC convertor depends on the switches configuration. An example of Maximum Power Point Tracking (MPPT) for different conversion function is presented in this paper. Simulation results show that at least 10 μW is generated.
Highlights
Replacement or recharging of batteries is a major problem for wide development of microscale devices such as wearable electronics, medical implants and wireless sensor networks
The use of a reversible converter enables dynamic control of the voltage VCres by controlling energy flows between the battery and the capacitor Cres in both directions
One can clearly see that there exists an optimal voltage value of VCres for which the harvested power is maximum
Summary
Replacement or recharging of batteries is a major problem for wide development of microscale devices such as wearable electronics, medical implants and wireless sensor networks. The simplicity and the high efficiency of this interface circuit enabled to implement ultra-low-power electrostatic energy harvesters [3]. This diode-based circuit cannot optimize the performance of the system by itself. The operating point can be controlled by adjusting the output voltage value of the N-cells circuit The association of this circuit with a DC-DC converter enables to achieve this control. The N-cells diode-based interface circuit is used to provide initial charge to the variable capacitor and transfer the generated energy to the storage capacitor (or bulk) Cres. The use of a reversible converter enables dynamic control of the voltage VCres by controlling energy flows between the battery and the capacitor Cres in both directions
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