Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-04-13
1995-09-05
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363132, 363136, H02M 5458
Patent
active
054484677
ABSTRACT:
The invention relates to a series-resonant converter circuit, which includes a capacitive energy storage network coupled to an inductive energy storage network for supplying a load. A current switching network comprising a pair of controlled switches is provided for switching the converter circuit between discrete successive cycles. Voltage clamping means, such as a pair of clamping diodes, are used to control the magnitude and polarity of the voltage across the capacitive energy storage network. A freewheel inductance is arranged to supply freewheel current for allowing zero voltage switching of the controlled switches at a switching frequency which is less than the resonant frequency of the resonant tank. At least one snubber capacitance is shunted across the controlled switches for reducing turn-off switching losses, the freewheel inductance being arranged to discharge into the snubber capacitance during a resonant transition interval just prior to turn-on of the controlled switch for equalizing the voltage across the switch and allowing zero voltage turn-on. The invention extends to a method of operating a circuit of this type.
REFERENCES:
patent: 4017784 (1977-04-01), Simmons et al.
Practical Switching Power Supply Design, Marty Brown, pp. 119-125, Copyright 1990.
Zero Voltage Switching Technique in High Frequency Off Line Converters, Jovanovic et al., IEEE, 1988, pp. 23-32.
IEEE Power Electronic Symposium, "Pseudo-Resonant Full Bridge DC/DC Converter", Patterson et al., Jun. 21-26, 1987, pp. 424-430.
Article: "Capacitor Voltage Clamped Series Resonant Power Supply With Improved Cross Regulation", Agrawal et al, 1989 IEEE (pp. 1141-1146).
Article: "Characteristics of a New Series-Resonant Converter With a Parallel Resonant Circuit", Kuwata et al, 1987 IEEE (pp. 204-210).
Article: "An Improves Method of Resonant Current Pulse Modulation for Power Converters", Schwarz, 1976 IEEE (pp. 133-141).
Riley Shawn
Stephan Steven L.
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