Controller for two-switch buck-boost converter

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

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323344, 323351, 363101, G05F 140

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active

054020603

ABSTRACT:
A controller for a two-switch buck-boost converter accomplishes one-at-a-time switch control by simultaneously employing an analog error signal to control one drive output and an analog inversion of that error signal, with respect to a voltage that is equal to the voltage excursion limit of a timing ramp signal, to control the other drive output. In a second embodiment of the invention, a controller employs a comparator to compare an analog error signal against a given voltage excursion limit of a timing ramp signal to perform the functions of determining which of two drive outputs is to be enabled to be modulated and of modifying the voltage excursion limits of the timing ramp signal such that the voltage excursion limit compared by the comparator is switched between two different voltage excursion limits.

REFERENCES:
patent: 4161771 (1979-07-01), Bates
patent: 4549254 (1985-10-01), Kissel
patent: 4639844 (1987-01-01), Gallios et al.
patent: 4685040 (1987-08-01), Steigerwald et al.
patent: 4686617 (1987-08-01), Colton
patent: 4864213 (1989-09-01), Kido
patent: 5289361 (1994-02-01), Vinciarelli

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