Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1994-04-14
1996-07-02
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 80, 363126, 323222, H02M 7155
Patent
active
055329187
ABSTRACT:
A high-power-factor power supply has a full-wave rectifier for rectifying an AC line voltage, a power regulator including switch means responsive to a control signal for controlling the application of the rectifier output to a load; and a control circuit for producing a switching control signal. The control signal includes a pair of AC line detectors: a first connected in a closed-loop automatic gain control arrangement, and the other connected in an open-loop arrangement. The control circuit initially produces a CURRENT DEMAND REFERENCE signal that is directly related to the difference between the power supply DC output voltage and a self-generated constant reference, and to the waveform shape of the AC line voltage, and is inversely related to magnitude changes of the AC line voltage. The control signal then produces the switching control signal in response to both the CURRENT DEMAND REFERENCE signal and the current flowing in the power supply. The invention avoids the square law dependency of prior art high-power-factor power supplies, can operate over a broad input dynamic range, and is "self-biasing" in that the power supply itself generates any needed reference voltages.
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Unitrode Switching Regulated Power Supply Design Seminar Manual, 1990, pp. 7-1 through 7-12, pp. 12-1 through 12-16, pp. P1-1 through P1-12, as described in the "Background" section of the application. The referenced pages include chapters entitled High Power Factor Switching Preregulator Design Optimization, High Power Factor Preregulators For Off-line Power Supplies, and Switching Power Supply Topology Review.
Gregorich James
Mayrand James F.
Berhane Adolf
Casey Mark J.
Digital Equipment Corporation
Fisher Arthur W.
Maloney Denis G.
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