Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1977-05-05
1980-02-26
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 363 96, 363 97, H02M 328
Patent
active
041908821
ABSTRACT:
A power supply arrangement that substantially eliminates the effects of the sidebands and harmonics at the switching frequency of the power supply on the RF carrier of an amplifier or other unit being supplied power. The switching frequency of the power supply arrangement is continuously varied in frequency at an appropriate rate and deviation with the result that a band of frequencies replaces the fundamental switching frequency of the power supply and all harmonics so that noise created by the switching frequency signal and the RF signal are then similarly diffused. The net power present as spurious noise in the amplifier unit is constant with the maximum amplitude of the noise as viewed, for example, in a doppler filter being substantially reduced. In a radar transmitter, for example, the transmitted pulse frequency appears as PRF sidebands of the CW frequency and the extraneous modulation from the switched power supply provides sidebands of the PRF sidebands. At each of these PRF sidebands, the switching frequency modulation, in accordance with the invention, causes the sidebands resulting from the switching frequency to be spread over a relatively wide band so as to substantially decrease the amplitude of the spurious signals.
REFERENCES:
patent: 3260921 (1966-07-01), Brahm
patent: 3406328 (1968-10-01), Studtmann
patent: 3735235 (1973-05-01), Hamilton et al.
patent: 3742330 (1973-06-01), Hodges et al.
patent: 3821630 (1974-06-01), Kornrumpf et al.
patent: 3859586 (1975-01-01), Wadlington
patent: 3913000 (1975-10-01), Cardwell, Jr.
patent: 3959710 (1976-05-01), Hill, Jr.
patent: 4050006 (1977-09-01), Stich
Electronics Design 6, "Choose Switching Regulators," Mar. 15, 1975, pp. 54-58.
Chevalier Arthur C.
McGarrity Richard P.
Rosen Robert
Zinkin Arthur S.
Adam Walter J.
Hughes Aircraft Company
MacAllister W. H.
Shoop William M.
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