Time ratio switching control system

Claim 2

In a control shifting device for changing from one mode of operation to another a controllable mEchanism having more than one mode of operation, the change being accomplished with a minimum of transient effect on the mechanism, the combination comprising pulse generating means, having at least two outputs, for producing at one output a series of pulses varying from zero percent to 100 percent duty cycle and producing at a second output the complement of said first series of pulses, at least two control means, each operating said mechanism in a particular mode, and switch means connected to the outputs of the pulse generating means for activating each control means in accordance with the duty cycle of each series of pulses.

Claim 3

The combination according to claim 1, wherein the pulse generating means comprises: a unijunction transistor oscillator producing a repetitive ramp voltage, a source of time varying voltage, comparator means producing a series of pulses whose duty cycle is proportional to the length of time said time varying voltage exceeds said ramp voltage, and inverting means coupled to said comparator for providing the inverse of the pulse series produced by the comparator.

Claim 4

The combination according to claim 1 wherein each of said control means comprises: a plurality of operational amplifiers, each adapted to be coupled in parallel to a set of control signals, wherein said switch means are connected to block or pass the control signals going to each of said plurality of amplifiers.

Claim 5

The combination according to claim 3, wherein the pulse generating means comprises: a unijunction transistor oscillator producing a repetitive ramp voltage, source to time varying voltage, comparator means producing a series of pulses whose duty cycle is proportional to the length of time said ramp voltage exceeds said time varying voltage, and inverting means coupled to said comparator for providing the inverse of the pulse series produced by the comparator.

Claim 6

In a control shifting device for changing from one mode of operation to another a controllable mechanism having more than one mode of operation, the change being accomplished with a minimum of transient effect on the mechanism, the combination comprising: pulse generating means having an output for producing at said output a series of pulses varying from zero to 100 percent of duty cycle, or vice-versa, control means for operating said mechanism in one of several modes, depending upon an input signal supplied to the control means, and switch means connected to the output of the pulse generating means and coupled to the control means for modifying the input signal to the control means in accordance with the duty cycle of the pulses.

Claim 7

In a control shifting device for changing from one mode of operation to another a controllable mechanism having more than one mode of operation, the change being accomplished with a minimum of transient effect on the mechanism, the combination comprising: pulse generating means having an output for producing at said output a series of pulses varying from zero to 100 percent of duty cycle, or vice-versa, control means for operating said mechanism in one of several modes, depending upon an input signal supplied to the control means, and switch means connected to the output of the pulse generating means and coupled to the control means for modifying the input signal to the control means in accordance with the duty cycle of the pulses.

Claim 8

The combination as set forth in claim 5 wherein said control means comprise: operational amplifier means having a plurality of parallel input impedance circuits, and wherein said switch means is connected to said input circuits so as to vary the impedance of said input circuits.