Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1979-08-02
1981-09-15
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318674, 318681, 318294, 318434, 318474, 318476, 318635, 361 30, G05B 902
Patent
active
042900000
ABSTRACT:
A power amplifier is disclosed for controlling the current flow through a load, such as a d-c servo motor. The amplifier includes a plurality of switching elements connected in bridge fashion with the load and a predetermined power source for coupling the load across alternate output terminals of the power source in accordance with the levels of a plurality of control signals respectively coupled to the plurality of switching elements. Logic circuitry, when enabled, couples each of the control signals to their respective switching elements for controlling same. Sensing circuitry is coupled to the load for generating an actual current signal indicative of the actual level of current flow through the load. A current limiter is coupled to the sensing circuitry for comparing the actual current signal with high and low level limit signals and for generating a current disable signal when either the actual current signal exceeds the high limit signal or the low limit signal exceeds the actual current signal. Disable circuitry coupled to the current limiter disables the logic circuitry when a true current disable signal is present.
REFERENCES:
patent: 3378699 (1968-04-01), Bruinsma et al.
patent: 3388307 (1968-06-01), Prapis et al.
patent: 3422326 (1969-01-01), White et al.
patent: 3471759 (1969-10-01), Broverman
patent: 3525029 (1970-08-01), Joslyn et al.
patent: 3526819 (1970-09-01), Graf
patent: 3538353 (1970-11-01), Hanger
patent: 3588650 (1971-06-01), Bevis
patent: 3686557 (1972-08-01), Futamura
patent: 3688157 (1972-08-01), Spears
Lytel, "Electronic Motor Control", Howard W. Sams & Co., Oct. 1974, pp. 143-147.
Indyk Eugene S.
Smith Barry Paul
Truhe J. V.
Xerox Corporation
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