Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-10-05
1997-08-05
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310318, H01L 4108
Patent
active
056546050
ABSTRACT:
An apparatus for controlling a piezoelectric transformer is disclosed. A transformer driver (12) supplies the transformer with a driving voltage the frequency of which is controlled by a frequency oscillator (18). A load current monitor (20, 22, 24, 26) observes a load current flowing through a load such as a fluorescent which is powered by said transformer. A frequency sweep controller (16) controls the frequently oscillator, when the transformer is initially energized, so as to execute a downward frequency sweep wherein the frequency of the driving voltage is swept from a predetermined upper frequency to a predetermined lower frequency. The frequency sweep controller further controls the frequency oscillator, after the transformer has been brought into stable operation, so as to execute the downward frequency sweep when the load current reduces to a second preset level lower than the first preset level.
REFERENCES:
patent: 4459505 (1984-07-01), Lim
patent: 5329200 (1994-07-01), Zaitsu
patent: 5341061 (1994-08-01), Zaitsu
patent: 5394048 (1995-02-01), Yamashita et al.
Budd Mark O.
NEC Corporation
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