US3710216A — Scr motor speed control with plug sensing circuit

Claim 1

Independent Claim 349 words

A control system for controlling energy supplied from a power source to a motor comprising first controlled rectifying means having a conductive and nonconductive condition connected to the motor for controlling the energization thereof, first generating means for generating a plurality of repetitive pulses of a predetermined period, second generating means connected to said first generating means for directing firing pulses to said first controlled rectifying means to render said first controlled rectifying means conductive at a predetermined time during each of said predetermined periods, third generating means for generating commutating pulses, commutating circuit means responsive to said third generating means for rendering said first controlled rectifying means nonconductive at the end of each of said predetermined periods, fourth generating means for generating a ramp signal upon acceleration of the motor from a zero speed condition, first control means for controlling the direction of rotation and the speed of the motor, speed and direction sensing means for affecting a substantially zero output from said fourth generating means when said speed and direction sensing means senses the rotation of said motor to be opposite the direction of rotation called for by said first control means, second control means having an input connected to said fourth generating means and an output connected to said second generating means for controlling the period of conduction of said first controlled rectifying means, dynamic braking means responsive to said speed and direction sensing means for applying an input to said second control means when said speed and direction sensing means senses the direction of rotation of the motor to be opposite the direction of rotation called for by said first control means to enable said second control means to effect conduction of said first controlled rectifying means at a predetermined minimum level to thereby dynamically brake the rotation of the motor, power supply means connected to the power source for applying predetermined potentials, and bypass means for rendering said first controlled rectifying means nonconductive and connecting the power source directly to the motor when said first control means is actuated to a full speed condition.

Claim 2

Dependent Claim 349 words

A control system for controlling energy supplied from a power source to a motor comprising first controlled rectifying means having a conductive and nonconductive condition connected to the motor for controlling the energization thereof, first generating means for generating a plurality of repetitive pulses of a predetermined period, second generating means connected to said first generating means for directing firing pulses to said first controlled rectifying means to render said first controlled rectifying means conductive at a predetermined time during each of said predetermined periods, third generating means for generating commutating pulses, commutating circuit means responsive to said third generating means for rendering said first controlled rectifying means nonconductive at the end of each of said predetermined periods, fourth generating means for generating a ramp signal upon acceleration of the motor from a zero speed condition, first control means for controlling the direction of rotation and the speed of the motor, speed and direction sensing means for affecting a substantially zero output from said fourth generating means when said speed and direction sensing means senses the rotation of said motor to be opposite the direction of rotation called for by said first control means, second control means having an input connected to said fourth generating means and an output connected to said second generating means for controlling the period of conduction of said first controlled rectifying means, dynamic braking means responsive to said speed and direction sensing means for applying an input to said second control means when said speed and direction sensing means senses the direction of rotation of the motor to be opposite the direction of rotation called for by said first control means to enable said second control means to effect conduction of said first controlled rectifying means at a predetermined minimum level to thereby dynamically brake the rotation of the motor, power supply means connected to the power source for applying predetermined potentials, and bypass means for rendering said first controlled rectifying means nonconductive and connecting the power source directly to the motor when said first control means is actuated to a full speed condition.

Claim 3

Dependent Claim 95 words

A control system for controlling energy directed from a power source to a motor as defined in claim 1 wherein said commutating circuit means includes a second controlled rectifying means and energy storage means connected parallel to said second controlled rectifying means, said energy storage means being charged to a first polarity and charging to a second polarity opposite said first polarity upon conduction of said second controlled rectifying means, said energy storage means when having said second polarity, reverse biasing said first and second controlled rectifying means to render said controlled rectifying means nonconductive.

Claim 4

Dependent Claim 149 words

A control system for controlling energy directed from a power source to a motor as defined in claim 2 wherein said energy storage means including an inductor and a capacitor series connected to form a LC resonant circuit, said second controlled rectifying means being connected parallel to said first controlled rectifying means, said LC resonant circuit being connected parallel to said second controlled rectifying means, said capacitor charging to a first polarity when said second controlled rectifying means is nonconductive and discharging through said inductor and said second controlled rectifying means upon conduction of said second controlled rectifying means, said capacitor charging to a second polarity, opposite said first polarity, upon discharge thereof through said inductor and said second controlled rectifying means, said capacitor when charged to said second polarity reverse biasing said first and second controlled rectifying means to render said first and second controlled rectifying means nonconductive.

Claim 5

Dependent Claim 50 words

A control system for controlling energy directed from a power source to a motor as defined in claim 1 wherein said power supply means includes an astable multivibrator and a diode-capacitor matrix connected to the output of said astable multivibrator for applying a regulated voltage to said second control means.

Claim 6

Dependent Claim 235 words

A control system for controlling energy directed from a power source to a motor as defined in claim 4 wherein said astable multivibrator includes first and second NAND gates connectable to the power source, each of said NAND gates having first and second output conditions, said first NAND gate having said first output condition when said second NAND gate has said second output condition and said first NAND gate having said second output condition when said second NAND gate has said first output condition, and said diode-capacitor matrix includes a first capacitor connected to the output of said first NAND gate, a second capacitor connected to the output of said second NAND gate, and a third capacitor connected to said first and second capacitors for applying a predetermined voltage, said first capacitor charGing when said first gate is in said first condition and discharging when said first gate is in said second condition, said second capacitor charging when said second gate is in said first condition and discharging when said second gate is in said second condition, said third capacitor being charged by said first capacitor when said first NAND gate is in said second condition and being charged by said second capacitor when said second NAND gate is in said second condition, said third capacitor being charged by said first and second capacitors to a predetermined negative potential with respect to the power source.

Claim 7

Dependent Claim 45 words

A control system for controlling energy directed from a power source to a motor as defined in claim 5 wherein said power supply further includes a Zener diode connected parallel to said third capacitor for regulating the negative output voltage applied by said third capacitor.

Claim 8

Dependent Claim 95 words

A control system for controlling energy directed from a power source to a motor as defined in claim 4 wherein said commutating circuit means includes a second controlled rectifying means and energy storage means connected parallel to said second controlled rectifying means, said energy storage means being charged to a first polarity and charging to a second polarity opposite said first polarity upon conduction of said second controlled rectifying means, said energy storage means when having said second polarity reverse biasing said first and second controlled rectifying means to render said controlled rectifying means nonconductive.

Claim 9

Dependent Claim 208 words

A control system for controlling energy directed from a power source to a motor including a first controlled rectifying means connected to the motor for controlling the energization thereof by pulse width modulation, a firing pulse generator connected to the gate of said first controlled rectifying means for periodically rendering said first controlled rectifying means conductive, a commutating circuit including a second controlled rectifying means connected parallel to said first controlled rectifying means, a resonant circuit connected parallel to said second controlled rectifying means, a commutating pulse generator connected to the gate of said second controlled rectifying means for periodically rendering said second controlled rectifying means conductive, said resonant circuit acting upon conduction of said second controlled rectifying means to reverse bias said first controlled rectifying means thereby rendering said first controlled rectifying means nonconductive, first control means for determining the direction of rotation of said motor, plug sensing means for sensing when the motor is rotating in a direction opposite to that called for by said first control means and dynamic braking circuitry for maintaining said firing pulse generator operating at a predetermined minimal value while the motor is traveling in a direction opposite that called for by the first control means to dynamically brake the motor.

Claim 10

Dependent Claim 208 words

A control system for controlling energy directed from a power source to a motor including a first controlled rectifying means connected to the motor for controlling the energization thereof by pulse width modulation, a firing pulse generator connected to the gate of said first controlled rectifying means for periodically rendering said first controlled rectifying means conductive, a commutating circuit including a second controlled rectifying means connected parallel to said first controlled rectifying means, a resonant circuit connected parallel to said second controlled rectifying means, a commutating pulse generator connected to the gate of said second controlled rectifying means for periodically rendering said second controlled rectifying means conductive, said resonant circuit acting upon conduction of said second controlled rectifying means to reverse bias said first controlled rectifying means thereby rendering said first controlled rectifying means nonconductive, first control means for determining the direction of rotation of said motor, plug sensing means for sensing when the motor is rotating in a direction opposite to that called for by said first control means and dynamic braking circuitry for maintaining said firing pulse generator operating at a predetermined minimal value while the motor is traveling in a direction opposite that called for by the first control means to dynamically brake the motor.

Claim 11

Dependent Claim 67 words

A control system for controlling energy directed from a power source to a motor as defined in claim 8 further including a regulated negative power supply including an astable multivibrator connected to the power source and a diode-capacitor matrix connected to the output of said astable multivibrator for directly inverting the power supplied to said astable multivibrator by the power source to produce a negative output voltage.

Claim 12

Dependent Claim 122 words

A control system for controlling energy directed from a power source to a motor as defined in claim 8 further including an oscillator, a sawtooth generator, and a reference operational amplifier, for producing a DC control signal at the output thereof, said output of said reference operational amplifier being summed with the output of said sawtooth generator and being applied to said firing pulse generator, said summed output of said sawtooth generator and said reference operational amplifier actuating said firing pulse generator upon exceeding a predetermined threshold voltage to thereby effecT conduction of said first controlled rectifying means, said commutating pulse generator having an input from said oscillator and actuating said commutating circuit at the end of each cycle of said oscillator.

Claim 13

Dependent Claim 68 words

A control system for controlling energy directed from a power source to a motor as defined in claim 10 further including a reference ramp generator, for producing an output applied to a positive input of said reference operational amplifier and a maximum current limit circuit for sensing the current flow through the motor and applying a negative input signal to the positive input of said reference operational amplifier.

Claim 14

Dependent Claim 178 words

A control system for controlling energy directed from a power source to a motor as defined in claim 11 wherein said plug sensing means has an output directed to said reference ramp generator when the motor is rotating in a direction opposite to that called for by said first control means to effect a substantially zero output from said reference ramp generator and said dynamic braking circuitry responsive to the output of said reference ramp generator, said dynamic braking circuitry having an output therefrom directed to the positive input of said reference operational amplifier when the output of said reference ramp generator goes to substantially zero, said output of said dynamic braking circuit effecting a minimal output from said reference operational amplifier to enable the summed output of said reference operational amplifier and said sawtooth generator to exceed the threshold voltage of said firing pulse generator to thereby effect firing of said first controlled rectifying means to dynamically brake the motor when it is traveling in a direction opposite to that called for by said first control means.

Claim 15

Dependent Claim 106 words

A control system for controlling energy directed from a power source to a motor as defined in claim 9 further including bypass circuit means, said bypass circuit means including a pair of normally open contacts connected parallel to said first controlled rectifying means, said contacts closing in response to an output from said bypass circuit means to apply full potential from the power source to the motor, means responsive to the speed of the motor for closing said contacts when the motor is running at full speed and means for rendering said first controlled rectifying means nonconductive when the motor is running at the full speed.

Claim 16

Dependent Claim 71 words

A control system for controlling energy directed from a power source to a motor as defined in claim 9 further including first control means including at least a pair of contacts connected to the motor for effecting energization thereof and delay circuit means for delaying the output of said firing pulse generator after closing of said contacts to prevent bouncing of said contacts from interfering with the energization of the motor.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-01-09	1976-07-10	1977-01-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-01-09	1980-07-10	1981-01-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-01-09	1984-07-10	1985-01-09	$7700.00	Window Closed / Lapsed

Scr motor speed control with plug sensing circuit

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