CuK DC-to-DC switching converter with input current shaping for

Electric power conversion systems – Current conversion – With condition responsive means to control the output...

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363 16, H02M 7217

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active

054425395

ABSTRACT:
A DC voltage to a load is provided from a rectified AC power line source with unity power factor using Cuk dc-to-dc switching converter, either unisolated or isolated extensions, operated as an automatic current shaper with unity power factor performance. This is obtained by operating the Cuk converter in a discontinuous inductor current mode (DICM) at a constant switching frequency and constant duty ratio without input current feedback control customarily used, but operating in an open-loop fashion. Even though the Cuk converter is operated in DICM, its input current is nonpulsating and flowing throughout the switching cycle, unlike other converters having pulsating input current in DICM, thus reducing input harmonic currents due to switching frequency and its harmonics. Further improvement is obtained and even the remaining ripple in the input current is entirely eliminated to result in ideal, clean, harmonic-free input current waveform with unity power factor performance, when the coupled-inductor and/or integrated magnetics extensions of the Cuk converter conditions are implemented. They could be operated at low to moderate switching frequency, thus providing high efficiency and without the need for additional input filtering customarily used in other converters.

REFERENCES:
patent: 4184197 (1980-01-01), Cuk et al.
patent: 4257087 (1981-03-01), Cuk
S. D. Freeland, "Input Current Shaping for Single-Phase Ac-Dc Power Converters," Ph.D. Thesis, Part II, California Institute of Technology, Dec. 1988 pp. 174-192 only.
L. H. Dixon, Jr., "High Power Factor Pre-regulators for off-line Power Supplies," Unitrode Power Supply Design Seminar SEM-800, Dec. 1991, pp. I2-1-I2-16.
M. J. Kocher, et al., "An Ac to Dc Converter with High Quality Input Waveforms," IEEE Power Electronics Specialists Conference, Jun. 1982 Record, pp. 63-75, (IEEE Publication 82CHI762-4).
J. Sebastian, et al., "Improving Power Factor Correction in Distributed Power Supply Systems Using PWM and ZCSQR Sepic Topologies," IEEE Power Elec. Spec. Conf., Apr. 1991 Record, pp. 780-791, (IEEE Pub. 91CH3008-0).
D. Chambers, et al., "Dynamic P.F. Correction in Capacitor Input Off-Line Converters," Proc. Sixth National Solid-State Power Conference (POWERCON 6), Miami Beach, Fla., May 2-4, 1979, pp. B3.1-6.
B. Andreycak, "Controlled On-Time, Zero Current Switched Power Factor Correction Technique," Unitrode Switching Regulated Power Supply Design Seminar Manual, SEM-800, Sep. 1991, pp. 3.1-3.10.
R. Erickson, et al., "Design of a Simple High-Power-Factor Rectifier Based on the Flyback Converter," IEEE Applied Power Electronics Conference, Oct. 1990 Record, pp. 792-801.
S. Cuk, "Discontinuous Inductor Current Mode in the Optimum Topology Switching Converter," IEEE Power Electronics Specialists Conference, Syracuse, N.Y., Jun. 13-15, Jun. 1978, pp. 105-123.
S. Cuk, et al., "Coupled-Inductor Analysis and Design," IEEE Power Electronics Specialists Conference, Vancouver, Canada, Jun., 1986.

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