Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
1997-08-15
2001-01-23
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S040000, C323S225000, C323S300000
Reexamination Certificate
active
06178101
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention pertains to power supplies, and, more particularly, to power supplies with power factor correction (PFC) involving both the limitation of the input current distortion and the phase relationship between the input current and the input voltage.
BACKGROUND OF THE INVENTION
Power supplies, in order to be most efficient, must provide a load to the primary power source such that the power factor of the voltage and current into the power supply is close to 1.0. Any degradation of this power factor results in power which is not available to the power supply, and thereby requires the primary power source to be able to provide more apparent power than the actual power necessary. As a result power factor input specifications, such as IEEE 519, are more and more being placed on power supplies.
The power factor, the real power divided by the apparent power, is determined principally by two factors: The phase relationship between the voltage and current, and the distortion of the current.
SUMMARY OF THE INVENTION
In accordance with the invention, a power supply monitors both the voltage applied to the power supply input and the current transferred between the power source and the power supply and regulates the current transferred so that the input current has substantially the same waveform as the input voltage and is substantially in phase with the input voltage.
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Han Jessica
Howison Gregory M.
Howison Chauza Handley & Arnott
Unitron, Inc.
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