Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-08-25
1999-07-13
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 97, 363131, H02M 112
Patent
active
059235462
ABSTRACT:
A piezoelectric transformer is driven with the PWM driving method by means of a driving voltage with a waveform obtained by time-dividing a first frequency with a binary pulse of a second frequency lower than the first frequency. A harmonic component of said second frequency component contained in said first frequency component can be suppressed by decreasing a slope of an envelope of said driving voltage waveform. A parasitic vibration of the piezoelectric transformer in the piezoelectric transformer-inverter controlled with the PWM system can be suppressed by controlling such inverter as described above and construction of the piezoelectric transformer support mechanism can be simplified.
REFERENCES:
patent: 5548189 (1996-08-01), Williams
patent: 5654605 (1997-08-01), Kawashima
patent: 5675484 (1997-10-01), Shimada
patent: 5705877 (1998-01-01), Shimada
patent: 5705879 (1998-01-01), Abe et al.
patent: 5731652 (1998-03-01), Shimada
patent: 5739622 (1998-04-01), Zaitsu
patent: 5739679 (1998-04-01), Takehara et al.
patent: 5751092 (1998-05-01), Abe
Kawashima Shingo
Shimada Yasuhei
NEC Corporation
Sterrett Jeffrey
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