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Vibration energy harvesting is attracting attention as a driving power supply for wireless sensor nodes. Piezoelectric elements are used for piezoelectric energy harvesting (PEH). Because piezoelectric elements provide AC power, a full bridge rectifier is used to obtain DC power. However, a parasitic capacitor of the piezoelectric elements causes a power loss in conventional PEH circuits. Synchronized...
A new type of Class E rectifier that can regulate the output voltage or power is proposed. The proposed rectifier is composed of a conventional Class E zero-voltage-switching rectifier and the controlled shunt capacitor whose capacitance is variable according to the state of the active switches. With turning the active switches ON or OFF, the shunt capacitance of the rectifier can be changed, which...
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