Reference signal generator, particularly for the control of a direct-current motor

Claim 2

Reference-signal generator, particularly for the control of a direct-current motor, comprising a regulated-voltage source supplying on of two inputs of a comparator via a resistive bridge, the output of said comparator connected by resistive means to an integrator-connected operational amplifier, the output of said amplifier being connected to the other input of said comparator.

Claim 3

Generator according to claim 1, characterized in that the resistive means of connection between the comparator and the operational amplifier comprise at least one potentiometer capable of varying the integration constant of the integrator formed by said resistive means and a capacitor associated with said operational amplifier.

Claim 4

Generator according to claim 1, characterized in that the resistive bridge arranged between the regulatedvoltage source and the comparator comprises a variable element to modify the amplitude of the plateaus of the generator''s output signals.

Claim 5

Generator according to claim 1, characterized in that a filter is arranged in the connection between the output of the operational amplifier and the other input of the comparator.

Claim 6

Generator according to claim 1, characterized in that the comparator is of the two-channel transistorized differential amplifier type in which the emitter-collector paths comprise a constant-current generator.

Claim 7

Generator according to claim 5, characterized in that the comparator comprises two emitter-follower-connected transistorized input stages each associated with one of said channels, with a constant-current generator being mounted in the emitter-collector path of each of said transistors of said input stages.

Claim 8

Reference signal generator, particularly for the control of a direct current motor, comprising: a regulated-voltage source of the pulse-controlled type; a resistive bridge connected to the output of said regulatedvoltage source and comprising a variable element to modify the amplitude of the plateaus of the generator''s output signal; a two-channel transistorized differential amplifier type comparator with one of its inputs connected to the midpoint of said resistive bridge, wherein the emitter-collector paths comprise a constant-current generator, and further comprising two emitter-follower-connected transistorized input stages each associated with one of said channels, with a constant-current generator being mounted in the emitter-collector path of each of said transistors of said input stages; an integrator-connected operational amplifier with a shunting capacitor associated therewith; resistive means connecting the output of said comparator with the input of said operational amplifier comprising at least one potentiometer capable of varying the integration constant of the integrator formed by said resistive means and said shunting capacitor; and means to connect the output of saiD operational amplifier to the other input of said comparator comprising a filter.

Claim 9

Reference signal generator, particularly for the control of a direct current motor, comprising: a regulated-voltage source of the pulse-controlled type; a resistive bridge connected to the output of said regulatedvoltage source and comprising a variable element to modify the amplitude of the plateaus of the generator''s output signal; a two-channel transistorized differential amplifier type comparator with one of its inputs connected to the midpoint of said resistive bridge, wherein the emitter-collector paths comprise a constant-current generator, and further comprising two emitter-follower-connected transistorized input stages each associated with one of said channels, with a constant-current generator being mounted in the emitter-collector path of each of said transistors of said input stages; an integrator-connected operational amplifier with a shunting capacitor associated therewith; resistive means connecting the output of said comparator with the input of said operational amplifier comprising at least one potentiometer capable of varying the integration constant of the integrator formed by said resistive means and said shunting capacitor; and means to connect the output of saiD operational amplifier to the other input of said comparator comprising a filter.