Converter comprising a piezoelectric transformer and a switching

Details Converter comprising a piezoelectric transformer and a switching Converter comprising a piezoelectric transformer and a switching

1996-02-26

1998-06-16

Berhane, Adolf

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 16, 363 95, 310316, 310318, H02M 3335, H01L 4108

Patent

active

057681112

ABSTRACT:
In a DC--DC converter comprising a piezoelectric transformer (25) having an input capacitance between a pair of transformer input teminals and a transformer resonant frequeney, an input switching stage (27) responsive to a DC input signal for supplying a sinusoidal transformer input signal, and an output rectifier stage (29) for producing a converter output voltage across a load resistor (23), the switching stage includes an input series inductor (39) connected in series to one of the transformer input terminals and having an input series inductance that defines a switching resonant frequency in cooperation with the input capacitance to be different from the transformer resonant frequency. It is preferred when the switching stage is operable in zero volt switching that the input series inductance be either between 1.0 and 2.2 .mu.H or between 3.0 and 3.4 .mu.H, or more preferably either between 1.4 and 1.8 .mu.H or about 3.0 .mu.H, if the input series inductance should be 2.8 .mu.H for rendering the switching resonant frequency equal to the transformer resonant frequency. The converter output voltage is controlled by a control stage (51) for feeding the converter output voltage back to the switching stage to reduce an on-off switching frequency of the DC input signal with an increase in load.

REFERENCES:
patent: 3683210 (1972-08-01), Kawada
patent: 3796897 (1974-03-01), Sakurai
patent: 4054806 (1977-10-01), Moriki et al.
patent: 5065301 (1991-11-01), Shioya et al.
patent: 5118982 (1992-06-01), Inoue et al.
patent: 5329200 (1994-07-01), Zaitsu
patent: 5438497 (1995-08-01), Jain
Toshiyuki Zaitsu, et al. "2MHz Power Converter with Piezoelectric Ceramic Transformer", pp. 430-436, 1992.
Toshiyuki Zaitsu, et al. "Piezoelectric Transformer Operating in Thickness Extensional Vibration and Its Application to Switching Converter", pp. 585-589, 1994.

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