Voltage compensated phase shifting circuit

Claim 2

A circuit for determining a prescribed shift in phase with respect to an alternating current input voltage comprising: a. a pair of transistors having substantially identical electrical characteristics, each of said transistors having a base, an emitter and a collector; b. means for providing the same voltage to the bases of each of said transistors; c. means for providing a first current proportional to average positive half cycle of the input voltage to the collector to emitter circuit of a first of said transistors; d. means to interconnect the collector and base of the first of said transistors; and, e. means for providing a second current proportional to the instantaneous value of the input voltage to the collector to emitter circuit of the other of said transistors whereby the values of said first and second currents are compared to provide an output signal from the collector to emitter circuit of said other transistor indicative of said prescribed shift in phase.

Claim 3

The invention in accordance with claim 1 further including a pulse generating means responsive to said output signal.

Claim 4

The invention in accordance with claim 1 further including means for selectively varying the magnitude of at least one of said first and second currents.

Claim 5

The invention in accordance with claim 3 wherein said last recited means includes at least one variable resistor.

Claim 6

A circuit for determining a prescribed displacement in phase with respect to an alternating current input voltage source comprising: a. a transformer having a primary winding in circuit with said voltage source and a center tapped secondary winding; b. full wave rectification means connected to said center tapped secondary winding to provide a rectified voltage; c. first and second transistors having substantially identical electrical chaRacteristics, each of said transistors having a base, an emitter and a collector; d. means interconnecting the bases of said first and second transistors whereby a common voltage may be applied to said bases; e. means interconnecting the base and the collector of said first transistor; f. first circuit means interconnecting said full wave rectification means and said first transistor for providing a first current proportional to said average rectified voltage to the collector to emitter circuit of said first transistor; and, g. second circuit means interconnecting said full wave rectification means with said second transistor for providing a second current proportional to the instantaneous value of said rectified voltage to the collector to emitter circuit of said second transistor whereby said first and second currents are compared to provide an output signal indicative of said prescribed displacement in phase.

Claim 7

A circuit for determining a prescribed displacement in phase with respect to an alternating current input voltage source comprising: a. a transformer having a primary winding in circuit with said voltage source and a center tapped secondary winding; b. full wave rectification means connected to said center tapped secondary winding to provide a rectified voltage; c. first and second transistors having substantially identical electrical chaRacteristics, each of said transistors having a base, an emitter and a collector; d. means interconnecting the bases of said first and second transistors whereby a common voltage may be applied to said bases; e. means interconnecting the base and the collector of said first transistor; f. first circuit means interconnecting said full wave rectification means and said first transistor for providing a first current proportional to said average rectified voltage to the collector to emitter circuit of said first transistor; and, g. second circuit means interconnecting said full wave rectification means with said second transistor for providing a second current proportional to the instantaneous value of said rectified voltage to the collector to emitter circuit of said second transistor whereby said first and second currents are compared to provide an output signal indicative of said prescribed displacement in phase.

Claim 8

The invention in accordance with claim 5 further including a pulse generating means responsive to said output signal.

Claim 9

The invention in accordance with claim 5 wherein at least one of said first and said second circuit means to vary the magnitude of its respective current.

Claim 10

The invention in accordance with claim 5 wherein said first and said second circuit means each includes means to vary the magnitude of its respective current.

Claim 11

The invention in accordance with claim 5 wherein said first circuit means includes filtering means.

Claim 12

The invention in accordance with claim 7 wherein said means to vary includes a variable resistor.