US3845374A — Circuitry for converting ac power to regulated dc…

Claim 1

Independent Claim 240 words

A circuit for supplying controlled power to a direct current motor having armature and field windings comprising: a. armature supply circuit means having first SCR switching means for controllably connecting electrical energy from a source to the armature windings of said motor; b. first control circuit means connected with the gate means of said first SCR means for controlling the percentage of source energy conducted through said first SCR means to said armature windings; c. first regulating means connected with said first control means for changing the amount of time said first SCR means conduct as required to maintain a preselected output at said armature windings irrespective of changes in the energy taken by the armature windings or changes in the energy appearing in the source; d. field circuit means having second SCR switching means for controllably connecting electrical energy from a source to the field windings of said motor; e. second control circuit means connected with the gate of said second SCR means for controlling the percentage of source energy conducted through said second SCR means to said field windings; and f. second regulating means connected with said second control means for changing the amount of time said second SCR means conducts as required to maintain a preselected output at said field windings irrespective of changes in the energy taken by the field windings or in the energy appearing in the source energy supplied to said field circuit means.

Claim 2

Dependent Claim 240 words

A circuit for supplying controlled power to a direct current motor having armature and field windings comprising: a. armature supply circuit means having first SCR switching means for controllably connecting electrical energy from a source to the armature windings of said motor; b. first control circuit means connected with the gate means of said first SCR means for controlling the percentage of source energy conducted through said first SCR means to said armature windings; c. first regulating means connected with said first control means for changing the amount of time said first SCR means conduct as required to maintain a preselected output at said armature windings irrespective of changes in the energy taken by the armature windings or changes in the energy appearing in the source; d. field circuit means having second SCR switching means for controllably connecting electrical energy from a source to the field windings of said motor; e. second control circuit means connected with the gate of said second SCR means for controlling the percentage of source energy conducted through said second SCR means to said field windings; and f. second regulating means connected with said second control means for changing the amount of time said second SCR means conducts as required to maintain a preselected output at said field windings irrespective of changes in the energy taken by the field windings or in the energy appearing in the source energy supplied to said field circuit means.

Claim 3

Dependent Claim 59 words

A circuit as defined in claim 1 wherein said armature supply circuit means includes means for blocking alternating current wave forms of a single polarity appearing in a three phase AC source and conducting selected percentages of the opposite polarity wave form from each of the phases to provide a controlled amount of DC energy to said armature windings.

Claim 4

Dependent Claim 53 words

A circuit as defined in claim 2 wherein said field circuit means includes means for full wave rectifying an AC waveform from a single phase power source and for conducting a selected percentage of each half wave to the field windings to provide a controlled amount of DC energy to said field windings.

Claim 5

Dependent Claim 33 words

A circuit as defined in claim 3 further including solid state switching means for changing the polarity of the voltage appearing across the field windings to reverse the direction of motor rotor rotation.

Claim 6

Dependent Claim 55 words

A circuit as defined in claim 4 further including separately operable control circuit means for each phase of said armature circuit means and for the single phase of said field circuit means whereby the amount of energy conducted through SCR means in each separately operable control circuit means may be separately adjusted and feedback regulated.

Claim 7

Dependent Claim 58 words

A circuit as defined in claim 5 further including ganged linkages between said separately operable control circuit means for simultaneously effecting changes in the output of each of said three phases in the armature circuit and the single phase of the field circuit to change the speed of motor rotor rotation or the torque output of the motor.

Claim 8

Dependent Claim 29 words

A circuit as defined in claim 6 further including circuit interrupting means for terminating feedback regulation when the direction of motor rotation is to be suddenly stopped and reversed.

Claim 9

Dependent Claim 37 words

A circuit as defined in claim 6 further including circuit interrupting means for terminating the supply of energy to said armature windings when voltage across said field windings falls below a predetermined minimum value or is lost.

Claim 10

Dependent Claim 136 words

A control system for regulating the energy transferred to electrical load terminals from a polyphase, alternating current electrical source comprising: a. switching means for each phase of said system for electrically connecting said terminAls to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; and d. adjustable setting means included in said control means for establishing a desired current and/or voltage value at said output terminals.

Claim 11

Dependent Claim 136 words

A control system for regulating the energy transferred to electrical load terminals from a polyphase, alternating current electrical source comprising: a. switching means for each phase of said system for electrically connecting said terminAls to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; and d. adjustable setting means included in said control means for establishing a desired current and/or voltage value at said output terminals.

Claim 12

Dependent Claim 263 words

A control system for regulating the energy transferred to electrical load terminals from a three phase, alternating current electrical source comprising: a. switching means for each phase of said system including a silicon controlled rectifier (SCR) having its anode and cathode connected in series between said source and said load terminals for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated phase sources from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity connected to the load terminals; d. trigger pulse forming circuit means in each phase of said control means connected with the gate of the associated SCR for controlling conduction of said SCR during the occurrence in said phase of relatively positive wave forms of said source current; e. feedback means included in said control means for generating a feedback voltage representative of electrical changes in the source or electrical changes in a load connected to the load terminals, said feedback voltage in each phase being supplied to an amplifying, timing circuit to change the time of occurrence of grigger pulses produced by said pulse forming circuit means in each phase; and f. adjustable setting means included in said control means for establishing a desired current and/or voltage value at said output terminals.

Claim 13

Dependent Claim 263 words

A control system for regulating the energy transferred to electrical load terminals from a three phase, alternating current electrical source comprising: a. switching means for each phase of said system including a silicon controlled rectifier (SCR) having its anode and cathode connected in series between said source and said load terminals for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated phase sources from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity connected to the load terminals; d. trigger pulse forming circuit means in each phase of said control means connected with the gate of the associated SCR for controlling conduction of said SCR during the occurrence in said phase of relatively positive wave forms of said source current; e. feedback means included in said control means for generating a feedback voltage representative of electrical changes in the source or electrical changes in a load connected to the load terminals, said feedback voltage in each phase being supplied to an amplifying, timing circuit to change the time of occurrence of grigger pulses produced by said pulse forming circuit means in each phase; and f. adjustable setting means included in said control means for establishing a desired current and/or voltage value at said output terminals.

Claim 14

Dependent Claim 193 words

A control system for regulating the energy transfer to electrical load terminals from a three phase, alternating current electrical source comprising: a. switching means for each phase of said system including a silicon control rectifier (SCR) having its anode and cathode connected in series between said source and said load terminals for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; d. trigger pulse forming circuit means included in each phase and connected with the gate of the associated SCR for controlling conduction of said SCR during the occurrence in said phase of relatively positive wave forms of said source current; and e. electronic switching means for reversing the polarity of the voltage applied to said load terminals.

Claim 15

Dependent Claim 193 words

A control system for regulating the energy transfer to electrical load terminals from a three phase, alternating current electrical source comprising: a. switching means for each phase of said system including a silicon control rectifier (SCR) having its anode and cathode connected in series between said source and said load terminals for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminals; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; d. trigger pulse forming circuit means included in each phase and connected with the gate of the associated SCR for controlling conduction of said SCR during the occurrence in said phase of relatively positive wave forms of said source current; and e. electronic switching means for reversing the polarity of the voltage applied to said load terminals.

Claim 16

Dependent Claim 145 words

A control system for regulating the energy transferred to electrical load terminals from a polyphase, alternating current electrical source comprising: a. switching means for each phase of said system for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminal; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; and d. automatic output control means for supplying a predetermined, substantially constant current and voltage to said load terminals for loads which vary substantially from short circuit to open circuit values.

Claim 17

Dependent Claim 145 words

A control system for regulating the energy transferred to electrical load terminals from a polyphase, alternating current electrical source comprising: a. switching means for each phase of said system for electrically connecting said terminals to or disconnecting said terminals from the energy in the associated phase of said source; b. polarity responsive means in each of said switching means for continuously preventing current wave forms of a first polarity relative to the wave forms in associated source phases from connecting with said terminal; c. control means for each phase connected with each of said switching means for controlling the percentage of current wave forms of a second, opposite polarity conducted to the load terminals; and d. automatic output control means for supplying a predetermined, substantially constant current and voltage to said load terminals for loads which vary substantially from short circuit to open circuit values.

Claim 18

Dependent Claim 36 words

A control system as defined in claim 12 further including inductive feedback control means for automatically changing the energy supplied to said load terminals as required to maintain a predetermined voltage level across aaid inductive means.

Claim 19

Dependent Claim 30 words

A control system as defined in claim 12 further including automatic feedback control means employing an earth ground reference for maintaining a substantially constant energy supply to said load terminals.

Claim 20

Dependent Claim 36 words

A control system as defined in claim 12 further including input regulating means for suppressing noise spikes in said source to isolate said control means from signals which may cause undesired switching of said switching means.

Claim 21

Dependent Claim 34 words

A control system as defined in claim 12 further including adjustment means between each phase of said source and said system for separately adjusting the amplitude of each source phase supplied to said system.

Claim 22

Dependent Claim 46 words

A control system as defined in claim 12 further including automatic feedback control in each of said control means for independently changing the amount of energy supplied by each phase to said load terminals as required to maintain a predetermined energy supply to said load terminals.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-10-28	1978-04-29	1978-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-10-28	1982-04-29	1982-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-10-28	1986-04-29	1986-10-29	$7700.00	Window Closed / Lapsed

Circuitry for converting ac power to regulated dc power

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