Progressive start up device for a switching power supply

Details Progressive start up device for a switching power supply Progressive start up device for a switching power supply

1989-03-03

1992-01-28

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

323901, H02M 3335

Patent

active

050848119

ABSTRACT:
In a switching power supply controlled by modulated width pulses obtained by comparison between a saw-tooth voltage (15) oscillating between first and second levels and a servo control voltage (19), the servo control voltage is initially set to a value external to the oscillation interval of the saw-tooth, then, in a first phase, varies up to a first level (dead time) and, in a second phase, varies from the first to the second level for supplying control pulses having progressively increasing widths. A circuit (45, 50) ensures the variation of the servo control voltage during the first phase according to a first slope and then the variation of said servo control voltage during the second phase according to a second slope, lower than the first one, and a circuit (60) causes the slope switching after the detection of the first control pulse.

REFERENCES:
patent: 3879647 (1975-04-01), Hamilton et al.
patent: 3959714 (1976-05-01), Mihelich
patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4272805 (1981-06-01), Iguchi et al.
patent: 4405975 (1983-09-01), Overstreet et al.
patent: 4494048 (1985-01-01), Van Den Driessche
"Switching Regulator Soft Start Circuit", IBM Technical Bulletin, vol. 29, No. 5, Oct. 1986, pp. 2019-2020.

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