Patent US3700933A successfully refreshed from Google Patents.
US3700933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit
Assignee: Waynco Inc
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Filing: 1970-09-28
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Granted: 1972-10-24
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Expires: 1990-09-28
Abstract
Abstract An electrical circuit is provided wherein pulsed energy samples are applied to a load at spaced intervals and monitored to determine the condition of the load and any changes in pulse energy through the load are compared to a reference and used to initiate control action.
Inventors
- 👤 Robert J Harkenrider
- 👤 John L Moe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:20
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; H; H02; H02H; H02H3/00; H02H3/02; H02H3/06; H02H3/066
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
169 words
A controller comprising, a power source, a load having a predetermined coefficient of resistance, switching means operably connected between said load and said power source, said switching means having an input and an output, means for monitoring the current passing through said load and adapted to develop a sampling voltage, a comparatOr circuit including a reference voltage means, the output of said monitoring means being operably coupled to said comparator circuit, said comparator circuit having its output coupled to the input of said switching means, said comparator circuit operating to energize said switching means to apply power to said load when the voltage of said monitoring means is different than the voltage of said reference voltage means, a pulser means also operatively coupled to the input of said switching means and being operable to apply pulses of energy to said switching means at periodic intervals and to periodically energize said switching means to apply power to said load when said switching means is not energized by said comparator circuit.
Claim 2
Dependent Claim
169 words
A controller comprising, a power source, a load having a predetermined coefficient of resistance, switching means operably connected between said load and said power source, said switching means having an input and an output, means for monitoring the current passing through said load and adapted to develop a sampling voltage, a comparatOr circuit including a reference voltage means, the output of said monitoring means being operably coupled to said comparator circuit, said comparator circuit having its output coupled to the input of said switching means, said comparator circuit operating to energize said switching means to apply power to said load when the voltage of said monitoring means is different than the voltage of said reference voltage means, a pulser means also operatively coupled to the input of said switching means and being operable to apply pulses of energy to said switching means at periodic intervals and to periodically energize said switching means to apply power to said load when said switching means is not energized by said comparator circuit.
Claim 3
Dependent Claim
168 words
A circuit comprising, a power supply, a load, switching means operably connected between said load and said power source, and adapted to apply full load current to said load when energized, said switching means having an input and an output, pulsing means coupled to the input of said switching means to send an energizing pulse to said switching means at spaced intervals and cause said switching means to apply pulses of full load current to said load, monitoring means for determining the condition of said load coupled to receive energizing pulses to enable it to generate a signal indicative of the load condition, and a comparator circuit coupled to said monitoring means and independently of said pulsing means adapted to initiate the application of full load current to said load when the current through said load reaches a predetermined level as determined by said monitoring means and to cease the application of full load current to the load when said current through said load reaches another predetermined level.
Claim 4
Dependent Claim
168 words
A circuit comprising, a power supply, a load, switching means operably connected between said load and said power source, and adapted to apply full load current to said load when energized, said switching means having an input and an output, pulsing means coupled to the input of said switching means to send an energizing pulse to said switching means at spaced intervals and cause said switching means to apply pulses of full load current to said load, monitoring means for determining the condition of said load coupled to receive energizing pulses to enable it to generate a signal indicative of the load condition, and a comparator circuit coupled to said monitoring means and independently of said pulsing means adapted to initiate the application of full load current to said load when the current through said load reaches a predetermined level as determined by said monitoring means and to cease the application of full load current to the load when said current through said load reaches another predetermined level.
Claim 5
Dependent Claim
26 words
A circuit as claimed in claim 2 wherein said monitoring means includes a sampling resistor which provides a signal proportional to the current through the load.
Claim 6
Dependent Claim
35 words
A circuit as claimed in claim 3 wherein the sampling resistor provides a voltage signal and said comparator circuit includes a means of generating a reference voltage against which the sampling resistor voltage is compared.
Claim 7
Dependent Claim
36 words
A circuit as claimed in claim 4 wherein the voltage difference between said sampling resistor and said reference voltage means is applied to an amplifier, and wherein the amplifier output is coupled to said switching means.
Claim 8
Dependent Claim
67 words
A control circuit as claimed in claim 2 wherein said switching means includes a first SCR having its gate coupled to the output of said comparator circuit, and wherein the power circuit of said first SCR is coupled to the gate of a second SCR of reverse polarity, with said SCR''s being connected to provide full wave power to said load when said switching means is on.
Claim 9
Dependent Claim
43 words
A circuit as claimed in claim 6 wherein said means for sending an energy pulse to said switching means includes a unijunction transistor having its base coupled a source of pulsing signals and its output coupled to the gate of said first SCR.
Claim 10
Dependent Claim
24 words
A circuit as claimed in claim 2 wherein said means for sending an energizing sampling pulse to said switching means includes a unijunction transistor.
Claim 11
Dependent Claim
75 words
A control circuit as claimed in claim 2 wherein a pair of SCR''s are connected back to back with respect to one another with the gate of a first SCR being coupled to the output of said comparator and the output of said first SCR being coupled through a capacitor to the gate of the second of said SCR''s, and wherein said monitoring means is coupled to the output of the second of said SCR''s.
Claim 12
Dependent Claim
16 words
A circuit as claimed in claim 2 wherein said load has a predetermined coefficient of resistance.
Claim 13
Dependent Claim
18 words
A circuit as claimed in claim 2 wherein said monitoring means is on one arm of a bridge.
Claim 14
Dependent Claim
23 words
A circuit as claimed in claim 11 wherein said comparator circuit includes a reference voltage means in an opposite arm of said bridge.
Claim 15
Dependent Claim
34 words
A circuit as claimed in claim 11 wherein the oUtput of said bridge is coupled to a flip-flop circuit and wherein the output of said flip-flop circuit is adapted to energize said switching means.
Claim 16
Dependent Claim
66 words
A control circuit as in claim 2 wherein said comparator circuit includes a flip-flop circuit, and wherein the output of said flip-flop is coupled to the control circuit of a unijunction transistor to energize said unijunction transistor in one state of said flip-flop, and wherein separate means are also coupled to the control circuit of said unijunction to pulse and energize said unijunction at spaced intervals.
Claim 17
Dependent Claim
42 words
A circuit as in claim 14 wherein the output of said unijunction transistor is coupled to a pulse transformer, and wherein said switching means is a triac and the output of said pulse transformer is coupled to the gate of said triac.
Claim 18
Dependent Claim
19 words
A circuit as in claim 2 wherein said monitoring means functions on half-wave intervals of an AC line source.
Claim 19
Dependent Claim
53 words
A circuit as claimed in claim 2 wherein said power supply provides an AC supply, and wherein a capacitor is in series with a zener across said supply, and wherein a rectifying element is in series with a second capacitor, the said rectifying element and second capacitor then being paralleled with said zener.
Claim 20
Dependent Claim
116 words
A circuit comprising, a power source, a load having a preselected coefficient of resistance, control means operable to apply full load current to said load from said power source, means for monitoring the relative resistance of said load and adapted to provide a signal indication thereof, comparator means operable to energize said control means so as to apply full load current to said load when the load resistance varies in a predetermined amount as determined by said monitoring means, and pulsing means operable to apply substantially full load current pulses to said load to enable said monitoring means to determine the condition of said load when said control means is not energized by said comparator circuit.
Claim 21
Dependent Claim
116 words
A circuit comprising, a power source, a load having a preselected coefficient of resistance, control means operable to apply full load current to said load from said power source, means for monitoring the relative resistance of said load and adapted to provide a signal indication thereof, comparator means operable to energize said control means so as to apply full load current to said load when the load resistance varies in a predetermined amount as determined by said monitoring means, and pulsing means operable to apply substantially full load current pulses to said load to enable said monitoring means to determine the condition of said load when said control means is not energized by said comparator circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |