Method and apparatus for automatic average current mode controll

Details Method and apparatus for automatic average current mode controll Method and apparatus for automatic average current mode controll

1997-08-29

1999-07-06

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 48, 363 80, 323288, H02M 112, H02M 542, G05F 140

Patent

active

059204710

ABSTRACT:
A method for preparing power factor control integrated circuits which generate linear pulse width modulation (PWM) waveforms is presented. The method of pulse width modulation waveform generation involves providing a capacitor; fast charging the capacitor; and controlling a discharge rate of the capacitor to ensure a constant switching period and a linear PWM waveform. The method is applicable for any single-phase ac/dc converter topology that performs power factor correction. Unlike conventional techniques which utilize three feedback loops, the method of the present invention reduces the total number of feedback loops to two, eliminates input voltage sensing and achieves the same objective. This method results in significant integrated circuit simplification, such as elimination of multiplier, squarer and divider circuits in the control integrated circuit and reduces the cost of the integrated circuit.

REFERENCES:
patent: 4816982 (1989-03-01), Severinsky
patent: 5095416 (1992-03-01), Ohms
patent: 5614810 (1997-03-01), Nostwick et al.
patent: 5617013 (1997-04-01), Cozzi
patent: 5742151 (1998-04-01), Hwang

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