G - Physics – 05 – D
Patent
G - Physics
05
D
341/38, 341/88
G05D 13/02 (2006.01) G05D 7/06 (2006.01) G05D 13/62 (2006.01)
Patent
CA 1039833
Abstract of the Disclosure A proportional speed floating controller adapted in response to a process-variable signal to produce bidirectional time-proportional direct current signal pulses. The apparatus includes a deviation amplifier responsive to the departure of the process-variable signal from a set point produces an error signal the magnitude and polarity of which depends upon the extent and direction of departure of said process-variable signal from the set point. A triangular wave signal is produced by a triangular wave generator. A modulator which includes an error signal polarity detector for producing a first steady signal at a first terminal when the error is of one polarity and for producing a second steady state signal at a second terminal when said error signal is of the opposite polarity. This modulator further compares the triangular wave signal with the absolute value of the error signal for producing at a third terminal, a signal the duration of which var- ies in accordance with the relative magnitudes of the error and triangular wave signals. An output circuit produces bidirectional direct current pulses, the direction and duration of which vary in accordance with the polarity and amplitude of the error signal.
289766
Guicheteau Eugene H.
Johnson Justin O. (jr.)
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