Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1986-10-03
1987-08-11
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 37, 363 49, 363143, H02M 3335
Patent
active
046866167
ABSTRACT:
A power supply provides the stable DC voltages needed for a computer terminal from a wide range of line voltages and frequencies. The line is rectified and fed to a flyback transformer wherein primary current is controlled in duration for providing the desired energy transfer to the secondary winding. The outputs from the flyback transformer are rectified and filtered. A separate start-up circuit uses a transformer across the line voltage, and a positive coefficient resistor provides a time limit to allow the use of a small transformer even though the line voltage may be high. The start-up circuit must produce a minimum voltage for the switching transistor in the flyback arrangement to allow operation of the power supply, and the start-up transformer is disconnected from the circuit after operation to prevent electromagnetic interference within the terminal. The output from the power supply is used in the control of the switching transistor so that, once the start-up circuit has achieved the needed voltage level, the power supply can assist in maintaining the operation.
REFERENCES:
patent: 3697854 (1972-10-01), Berger
Dolbachian, "Design and Construction of a 200W Switched Mode Power Supply", Toute Electron. (France), No. 458, pp. 73-78, Nov. 1980.
Groves et al, "Capacitive Start-Up Circuit for Switching Power Supply", IBM Tech. Discl. Bul., vol. 27, No. 4B, p. 2320, Sep. 1984.
"110 VAC/200 VAC Detector Switch", IBM Tech. Discl. Bul., vol. 27, No. 10B, pp. 6214-6215, Mar. 1985.
Beha Jr. William H.
Intecolor Corporation
Middleton James B.
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