Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1987-10-13
1989-06-06
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323285, 363 21, G05F 146, H02M 3335
Patent
active
048374954
ABSTRACT:
A current mode converter with continuously variable optimized slope compensation and improved power factor is disclosed. In the slope compensation circuit, the output voltage of the converter is sensed and a ramp signal is generated with a slope that is determined by the loading of the converter. The ramp signal is combined with a conventional sensed current signal of the converter to generate a composite sensed current signal which is coupled to the comparator of the converter. The other input to the comparator is a conventional error amplifier and the comparator's output is used to control switching of the converter. In an alternate embodiment, the continuously variable slope compensation circuit is operative using an un-filtered full-wave rectified input voltage waveform. An output is produced for the comparator which is the multiplied product of this input voltage and the output of the converter's error amplifier thereby amplitude-modulating the error signal and providing a composite error voltage that will always be proportional to the unsmoothed input voltage waveform.
REFERENCES:
patent: 4002963 (1977-01-01), Hunter
patent: 4150424 (1979-04-01), Nuechterlein
patent: 4386311 (1983-05-01), Bafaro
patent: 4672518 (1987-06-01), Murdock
patent: 4674020 (1987-06-01), Hill
patent: 4683528 (1987-07-01), Snow et al.
Astec U.S.A. (HK) Limited
Wong Peter S.
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