Method and apparatus for controlling the input impedance of a po

Details Method and apparatus for controlling the input impedance of a po Method and apparatus for controlling the input impedance of a po

1991-01-07

1992-07-21

Sterrett, Jeffrey

Electricity: power supply or regulation systems

Output level responsive

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

323272, 323285, 363 89, G05F 1563

Patent

active

051326060

ABSTRACT:
A DC-DC power converter adaptable for use with an AC input, uses feed forward control of the output power to control the input power and the dynamic resistance of the input to ensure a high power factor in the AC input embodiments of the converter. The dynamic response of the power converter is controlled by feed forward, either through scheduling the energy content of a storage capacitor as an explicit function of the output power, the input voltage and the time constant, or through energy deficit feed forward in which the energy deficit caused by a transient is fed forward as an increment of power under feed forward control. Line frequency ripple feed forward compensates the feed forward in the embodiments having an AC input for any half frequency harmonics present in full wave rectified input due to a DC offset or asymmetry in the AC input. With load anticipation feed forward control, input power transitions smoothly without overshoot for a step change of output load from no load to full load and back.

REFERENCES:
patent: 3768001 (1973-10-01), Thorberg
patent: 3914617 (1975-10-01), Corbel
patent: 4666020 (1987-05-01), Watanabe
patent: 4713742 (1987-12-01), Parsley
patent: 4783728 (1988-11-01), Hoffman
patent: 4816739 (1989-03-01), Sakurai et al.

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