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AssigneeHitachi, Ltd.
InventorsTakayuki Yosioka, Tadashi Komada, Akira Sugano, Takafumi Fukumaru
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A proportional-integral circuit comprising a proportional element, an integrator and an adder. In an automatic mode, the proportional element delivers an output signal V.sub.P which is proportional to an input signal V.sub.i, the integrator delivers an output signal V.sub.I by integrating the input signal V.sub.i, and the adder delivers an output signal V.sub.PI which is the sum of the output V.sub.P of the proportional element and the output V.sub.I of the integrator. In a handling mode, the input signal V.sub.i is not applied to the integrator, and the output V.sub.P of the proportional element and an output V.sub.H of a manual handling source are applied to the integrator. A resistor is connected in parallel with a feedback capacitor in the integrator so that the integrator possesses an adding function. The adder adds up the output V.sub.P of the proportional element and the output V.sub.I of the integrator. Further, in this circuit, the gain of the integrator output V.sub.I relative to V.sub.P and V.sub.H is selected to be l/n, and the gain of the adder output V.sub.PI relative to V.sub.I is selected to be n.
A proportional-integral circuit provided with means for change-over between an automatic mode and a handling mode comprising an input signal V.sub.i, an output signal V.sub.o , a proportional means composed essentially of an operational amplifier for delivering an output proportional to said input signal V.sub.i , an integrator composed essentially of an operational amplifier for integrating said input signal V.sub.i , an adder means composed essentially of an operational amplifier for obtaining the sum of the output of said proportional means and the output of said integrator means, a manual handling source means delivering an output substantially equal to the output of said adder in the automatic mode and a manual handling signal in the handling mode, and means for alternately switching the source of said output signal V.sub.o between the output of said manual handling source means and said adder means, said proportional-integral circuit further comprising means for blocking application of said input signal V.sub.i to said integrator means when the handling mode is selected, means for applying the output of said proportional means and the output signal of said manual handling source means to the input terminal of said operational amplifier constituting the essential part of said integrator means when the handling mode is selected, and means for connecting a resistor across the input and output terminals of said operational amplifier constituting the essential part of said integrator means when the handling mode is selected, the gain of the output of said integrator means relative to the output of said proportional means and the output signal of said manual handling source means being selected to be 1/n, and the gain of the output of said adder means relative to the output of said integrator means being selected to be n where n is greater than unity.
Dependencies are inferred from the claim text.