Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1993-11-08
1995-08-08
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
315209R, H02M 112, H05B 3702
Patent
active
054404754
ABSTRACT:
Power factor is increased and harmonic distortion is decreased in a boost circuit by varying the current drawn in phase with the ripple voltage from a rectifying bridge. The boost circuit includes a series connected inductor and switching transistor and the control electrode of the switching transistor is connected to a second inductor. The second inductor is magnetically coupled to the first inductor and provides feedback for sustaining high frequency oscillations in the boost circuit. A third inductor is magnetically coupled to the first and second inductors and to the control electrode of the switching transistor. The voltage from the third inductor is rectified and filtered to remove the high frequency pulses but not the ripple and the voltage is coupled to the control electrode of the switching transistor for changing the power consumed by said boost circuit in phase with the ripple.
REFERENCES:
patent: 4222096 (1980-09-01), Capewell
patent: 4654774 (1987-03-01), Lemmers
patent: 4862041 (1989-08-01), Hirschmann
patent: 4959591 (1990-09-01), Hirschmann
patent: 5115347 (1992-05-01), Nilssen
patent: 5122712 (1992-06-01), Hirschmann
patent: 5214356 (1993-05-01), Nilssen
patent: 5311102 (1994-05-01), Du
Crouse Kent E.
Russell Randy G.
Dougherty Thomas M.
Energy Savings, Inc.
Nguyen Matthew V.
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