Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-01-22
1999-08-31
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 89, 363 97, 363134, H02M 3335
Patent
active
059462027
ABSTRACT:
Boost Mode Regulator techniques are used to provide regulated a.c. or d.c. output from a.c. or d.c. sources. One embodiment involves regulation of the output of an a.c. source to provide a regulated d.c. voltage. The source inductance becomes part of the boost mode circuit, thus avoiding the losses associated with the addition of external inductors. When a three-phase alternator is the power source, the circuit comprises a six diode, three-phase rectifier bridge, three FET transistors and a decoupling capacitor. The invention involves shorting the output of the power source to allow storage of energy within the source inductance. During this time, the decoupling capacitor supports the load. When the short is removed, the energy stored in the inductances is delivered to the load. Because the circuit uses the integral magnetics of the source to provide the step-up function, the efficiency of the design can be quite high. In another embodiment, the leakage inductance of an isolation transformer is used to provide regulated a.c. or d.c. outputs from an a.c. source and to provide regulated a.c. or d.c. output from a d.c. source. Where a d.c. source is used, chopper circuits are used on the primary side of the transformer. The invention provides for regulation of the output voltage or for maintaining a power factor substantially close to unity.
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Prasad, et al. "Active Input Current Waveshaping Method for Three-Phase Diode Rectifiers with Zero Switching Losses", IEEE/IAS Annual Meting , May 1991, Conference Record, pp. 932-938.
Baker Hughes Incorporated
Sterrett Jeffrey
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