Abstract:

In order to enhance the output power of a piezoelectric generator(energy conversion system),power calculation models were established for the AC and DC-output circuits and their simulation analysis and test validation were performed.The analysis results showed that there were different optimal load resistances for the two output circuits to obtain maximal output power under a given open voltage of piezoelectric oscillator,which depends on its size and librating frequency.The optimal load and maximal power of the AC-output-circuit are 2/π and π/2 times those of the DC -output-circuit,respectively.The open voltage of the tested piezoelectric oscillator(58 mm×30 mm×0.7 mm) is 14.8 V at vibrating frequency of 44.3 Hz.Accordingly,the optimal analytical/tested load resistance of the AC and DC-circuits are 72/71 kΩ and 113/110 kΩ,and the maximal analytical/tested power are 0.76/87 mW and 0.49/4.7 mW,respectively.

Key words: technology of instrument and meter, piezoelectric, piezoelectric generator, output power, energy conversion