Unity power factor AC/DC converter

Details Unity power factor AC/DC converter Unity power factor AC/DC converter

1989-12-28

1991-09-03

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 323207, H02M 7217, G05F 170

Patent

active

050459910

ABSTRACT:
A control for an AC/DC power converter having first and second switches and which converts an AC voltage supplied by an AC source into a DC voltage on a DC output conductor includes circuitry for developing an error signal representing the deviation of the DC voltage from a desired level and a multiplier coupled to the developing circuitry and responsive to the AC voltage for deriving a reference signal representing a desired current magnitude from the AC source. A current sensor develops a current magnitude signal representing the magnitude of the current from the AC source and a circuitry having a hysteresis characteristic compares the current magnitude signal with the reference signal to obtain a comparison signal. Buffer and interface circuits operable the first and second switches in accordance with the comparison signal to in turn cause the DC voltage to approach the desired level and to cause the current from the AC power source to have a certain phase relationship with respect to the AC voltage supplied thereby.

REFERENCES:
patent: 4193111 (1980-03-01), Wester
patent: 4384321 (1983-05-01), Rippel
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4729082 (1988-03-01), Sato
patent: 4816985 (1989-03-01), Tanahashi
Article entitled, "A Current-Controlled PWM Transistor Inverter Drive", by A. B. Plunkett appearing in the publication Preceedings of the IEEE/IAS 1979 Annual Meeting, pp. 785-792.
Article entitled, "Electric Motor Drives and Control-Past, Present, and Future", by Paresh C. Sen appearing in the IEEE Transactions on Industrial Electronics, vol. 37, No. 6, Dec. 1990.
Article entitled, "Indirect Current Control of a Unity Power Factor Sinusoidal Current Boost Type Three-Phase Rectifier", by Dixon, et al., appearing in IEEE Transactions on Industrial Electronics, vol. 35, No. 4, Nov. 1988.

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