Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1997-01-27
1998-07-07
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 89, 323222, H02M 706, H02M 542, G05F 1652
Patent
active
057778663
ABSTRACT:
A power factor correction system with an EMI line filter at the input includes circuitry to sense the capacitor current of the EMI filter to improve the accuracy of the power factor enhancement. The circuitry consists of a current sensing means connected after the EMI filter, and a voltage sensing capacitor which derives its input signal from a pair of diodes separate from the conventional 4-diode rectifier bridge, which are connected either before or after the EMI filter. The current-sensing means, which may be a resistor, and the voltage-sensing capacitor are tightly coupled to the current control loop of the power factor correction system to compensate for the current in the EMI filter capacitors.
REFERENCES:
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4683529 (1987-07-01), Bucher, II
patent: 5001620 (1991-03-01), Smith
patent: 5012058 (1991-04-01), Smith
Electronic Design, Douglas Thom, Capacitor Drops Voltage with Little Heat for Low-Cost, Low-Voltage Power Supply, Nov. 22, 1975, p. 148.
Kelkar and Lee, "A novel Input Filter Compensation Scheme For Switching Regulators", PESC, Jun. 14, 1982, pp. 260-271.
Kelkar and Lee, "Adaptive Input Filter Compensation For Switching Regulators", IEEE Trans. Aerospace and Electronic Systems, vol. AES-20, No. 1, pp. 57-66, Jan. 1984.
Todd, "UC3854 Controlled Power Factor Correction Circuit Design", Unitro Application Note, (Unitrode Integrated Circuits of Merrimack, NH; Integrated Circuits/U-134, pp. 10-303 through 10-322).
Andreycak, "Optimizing Performance in UC3854 Power Factor Correction Applications", Unitro Design Note, (Unitrode Integrated Circuits of Merrimack, NH; Integrated Circuits/DN-39E, pp. 10-527 through 10-531).
Jacobs Mark Elliott
Jiang Yimin
Liu Rui
Thottuvelil Vijayin Joseph
Lucent Technologies - Inc.
Vu Bao Q.
Wong Peter S.
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