Future work

In our operation circuit, the variable capacitor was charged initially by using an external DC voltage source such as a battery. But the lifetime and volume of the battery limited the application of this converter. Therefore, the converted energy transferred to the input power source will be considered. The external voltage source is replaced with the flyback circuitry, as shown in Fig. 5.1 [24].

Fig. 5.1 Energy harvester with (a) flyback circuitry (b) operation block diagram [24]

The circuit employs a charge pump in the forward path and inductive energy flyback to return net energy to a reservoir. The flyback circuitry has the advantage of

(a)

(b)

producing the steady DC output power without any external voltage source during the vibration. In addition, it has no complex fabrication such as electrets material [25].

Theoretical analysis for energy scavenging technology is an essential objective in our effort. Energy scavenging from the vibration can be converted into the electrical power through different methods such as electrostatic, electromagnetic, and piezoelectric. But it has difficulty in discussing difference each other due to the different characteristic between these methods. Thus, the common theoretical description or comparison foundation will be proposed. And then the optimal parameters are found out for device design or characteristic comparison standard.

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