Digitally controlled A.C. to D.C. power conditioner

Details Digitally controlled A.C. to D.C. power conditioner Digitally controlled A.C. to D.C. power conditioner

1987-10-13

1988-08-02

Salce, Patrick R.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

323241, 323283, H02M 114

Patent

active

047617250

ABSTRACT:
An A.C. to D.C. power conditioner, which draws sinusoidal input current utilizes digital proportional-integral control to provide output voltage regulation by adjusting the gain of a current program loop. The current program loop controls the state of a power switch to force the instantaneous average current in an inductor to follow the instantaneous rectified line voltage. Variable hysteresis control provides noise immunity by increasing the ripple current in an iron-cored filter inductor when the instantaneous input voltage is high. Digital proportional-integral (PI) control provides output voltage regulation by adjusting, in discrete steps, the gain of the current program loop. A multiplying digital-to-analog converter serves as an interface between the voltage regulation loop and the current program loop. The sampling rate of the PI controller is determined by the input line frequency, which allows good transient response to be obtained. The current program loop forces the current drawn by the power conditioner to follow the input A.C. line voltage, thereby electronically emulating a resistor.

REFERENCES:
patent: 3761797 (1973-09-01), Spooner
patent: 4109194 (1978-08-01), Miller
patent: 4630187 (1986-12-01), Henze
patent: 4680689 (1987-07-01), Payne et al.
Heightman, "New Methods of Regulation for Stabilized Power Supplies", Marconi Review 21(130), 1958, pp. 110-130.
Edwards, "A New Offline Converter Topology Draws Sinusoidal Input Current", Proceeding of Powercon 11, F-4, pp. 1-5.
Mahadevan et al., "A Converter with Three Switched-Networks Improves Regulation, Dynamics, and Control", Powercon 10, E-1, pp. 1-19.
Chambers, "A New High Frequency Resonant Technique for Dynamic Correction of Offline Convert Input Current Waveforms", Powercon 10, F-1, pp. 1-7.
Edith Kamm, "New Military EMI Specifications Affecting the Input Circuit Architecture of AC to DC Converters", Proceedings of Powercon 8, Power Concepts, Inc. 1981, pp. 1-11.
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Keller & Baker, "Unity Power Factor Off Line Switching Power Supplies", 1984, IEEE, pp. 332-339.
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