Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1997-01-27
1998-08-18
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
H02M 545
Patent
active
057965986
ABSTRACT:
An electric circuit for the conversion of a multiplicity of commercial power voltages to a predetermined supply voltage which is independent of the respective commercial power voltage, for a device with high electrical power requirements of high output, in the range up to 40 kW, such as a bobbin winding machine. The circuit contains a rectifier stage for generating a primary intermediate circuit DC voltage, a converter stage with power switches for generating a rectangular AC voltage, a high-power transformer with a connected secondary control circuit and a control stage which triggers the power switches at zero voltage in a phase-shift mode with a variable frequency and pulse width of the rectangular AC voltage as a function of the input voltage of the rectifier stage, the transformer primary winding current and both the voltage and the current in the secondary intermediate circuit.
REFERENCES:
patent: 4719550 (1988-01-01), Powell et al.
patent: 5297015 (1994-03-01), Miyazaki et al.
patent: 5504667 (1996-04-01), Tanaka et al.
patent: 5644483 (1997-07-01), Peng et al.
Fu-Sheng Tsai, "Small-Signal and Transient Analysis of a zero-Voltage-Switched, Phase-Controlled PWM Converter Using Averaged Switch Model", 1993, pp. 493-499.
Kutkut et al, "An Improved Full-Bridge Zero-Voltage Switching PWM Converter Using a Two-Inductor Rectifier", 1995, pp. 119-126.
Flamm Franz-Josef
Nowak Hans-Georg
Quante Michael
Wefers Frank
Nguyen Matthew V.
W. Schlafhorst AG & Co.
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