Switching controller directly operable from AC

Details Switching controller directly operable from AC Switching controller directly operable from AC

1981-12-15

1985-01-22

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318345B, 363 10, 363 87, 363127, 363129, H02P 1326

Patent

active

044955570

ABSTRACT:
A high response motor controller is disclosed which operates directly from a multi-phase AC power line without a DC link. The controller directly converts power from a fixed frequency multi-phase input to a D.C. or variable frequency output current. The output frequency is not limited by the AC power line frequency and the switching frequency is independent of the AC power line frequency. Controlled switching devices are connected between the multi-phase power input line and the power output line. Analog input signals are compared with signals representative of actual motor currents to produce current error signals. These current error signals control the conduction state of the controlled switching output transistors by a two state modulation process. The controlled switching output devices required to conduct the commanded motor current are selected by sensing and logically comparing the relative voltages of the various AC input line phases to utilize the phase lines having the greatest potential difference therebetween.

REFERENCES:
patent: 3246228 (1966-04-01), Wickenhagen
patent: 3470447 (1969-09-01), Gyugui et al.
patent: 3538417 (1970-11-01), Nijhof et al.
patent: 3909698 (1975-09-01), Nill
patent: 4017777 (1977-04-01), Bailey
patent: 4346432 (1982-08-01), Gurr
International Journal of Electronics, vol. 41, No. 6, pp. 537-587, Dec. 1976.

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