Method and apparatus for the generation of voltage pulses

Details Method and apparatus for the generation of voltage pulses Method and apparatus for the generation of voltage pulses

1989-01-10

1990-07-03

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323288, G05F 1565

Patent

active

049394436

ABSTRACT:
The present invention relates to a method and apparatus for the generation of voltage pulses for controlling the switching operation in switching power supplies. A voltage increase of a pulse generator is respectively started when reaching a first, lower threshold (A). Resetting of the voltage increase is carried out in free-running mode, when the voltage increase reaches a second (D) or a third (C) threshold lying between the first (A) and the second (D) one. In sync mode, the pulse edges occurring in the synchronization signal (V.sub.sync) effect resetting of the voltage increase. The advantages of the invention lie in the fact that the switching current, occurring at the change form free-running mode to sync mode due to the frequency difference, is minimized and that the generator operates reliably.

REFERENCES:
patent: 3579090 (1971-05-01), Madsen
patent: 4146830 (1979-03-01), Foster
patent: 4186336 (1980-01-01), Weinberg et al.
patent: 4414501 (1983-11-01), Bedard et al.
patent: 4634956 (1987-01-01), Davis et al.

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