Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1999-02-24
2000-06-20
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
31031601, H01L 41107, H02M 700
Patent
active
060781246
ABSTRACT:
A piezoelectric transformer driving circuit and method can prevent degradation of characteristics of a piezoelectric transformer. A repetition frequency of a drive voltage lower than a predetermined value, sweeping range narrower than a predetermined range and an output voltage of the piezoelectric transformer higher than a predetermined reference value are detected by a load current comparing circuit and an output voltage comparing circuit. In response to the results of the comparisons, a sweeping range varying means varies the repetition frequency to be higher than an upper limit value of the sweeping range in a frequency sweeping oscillator. By variation, the sweeping of the output voltage of the piezoelectric transformer is initiated from a small value to correct an effective value of a piezoelectric transformer vibration velocity to prevent degradation of characteristics of the piezoelectric transformer.
REFERENCES:
patent: 4703213 (1987-10-01), Gasler
patent: 5654605 (1997-08-01), Kawashima
patent: 5866969 (1999-02-01), Shimada et al.
patent: 5894184 (1999-04-01), Furuhashi et al.
Furuhashi Naoki
Yamaguchi Shuuji
Dougherty Thomas M.
NEC Corporation
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