H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/28 (2006.01) H05B 41/282 (2006.01)
Patent
CA 2159849
An apparatus for controlling a piezoelectric transformer is disclosed. A transformer driver supplies the transformer with a driving voltage the frequency of which is controlled by a frequency oscillator. A load current monitor observes a load current flowing through a load such as a fluorescent lamp which is powered by said transformer. A frequency sweep controller controls the frequency 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 a further downward frequency sweep if the load current reduces to a second preset level lower than a first preset level exhibited during the stable operation.
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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