US3679872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self compensating control circuit
Assignee: Individual
•
Filing: 1971-08-03
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Granted: 1972-07-25
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Expires: 1991-08-03
Abstract
Abstract A temperature compensating control device for blankets, wall wire or outlet or fuse breaking devices, which incorporates solid on/off control. The use of solid on/off control with resistance temperature compensation sensors rather than a phase control renders the circuit free of ''''gate trigger'''' means normally associated with simplified thyristor circuits. This simplifies greatly the transistor stage gain or transistor shunt controls previously demonstrated in the art. Intrinsic simplification with fewer parts and solid state temperature resistance compensating means of the thyristor itself are innovative, besides requiring fewer parts. The circuits incorporates, preferably a temperature override electromechanical heat sensitive, fail safe control regulator and additionally in one aspect a double-stranded wire fail safe means for temperature responsive means. A thyristor SCR is incorporated in the circuit and functions in such a manner as to give snap on or off control.
Inventors
- 👤 Peter Lauck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1909; G05D23/1927
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
In an electrical heating system and control circuit therefor including a heating element, capacitive resistance voltage divider circuit means, at least one temperature responsive sensor and a heating element actuator, controllable by an in accordance with temperature responsive sensor to operatively energize and de-energize the heating element, the improvement comprising: A. A series-parallel positioning of temperature responsive sensor means associated with said actuator and electrically connected in said voltage divider circuit means; and B. Said capacitive resistance voltage divider circuit means including the series connection of a capacitor and resistors operable to break input voltage to a reference voltage adapted to trigger said actuator in snap ''''on'''' and ''''off'''' control.
Claim 2
Dependent Claim
110 words
In an electrical heating system and control circuit therefor including a heating element, capacitive resistance voltage divider circuit means, at least one temperature responsive sensor and a heating element actuator, controllable by an in accordance with temperature responsive sensor to operatively energize and de-energize the heating element, the improvement comprising: A. A series-parallel positioning of temperature responsive sensor means associated with said actuator and electrically connected in said voltage divider circuit means; and B. Said capacitive resistance voltage divider circuit means including the series connection of a capacitor and resistors operable to break input voltage to a reference voltage adapted to trigger said actuator in snap ''''on'''' and ''''off'''' control.
Claim 3
Dependent Claim
45 words
A system as claimed in claim 1, said actuator comprising and SCR thyristor and said circuit having solid ''''on'''' and solid ''''off'''' conditions, the solid ''''on'''' of said SCR thyristor constituting a negative wave, said solid ''''off'''' SCR thyristor condition constituting a full sign wave.
Claim 4
Dependent Claim
15 words
A system as claimed in claim 2, said circuit voltage being a solid on/off control.
Claim 5
Dependent Claim
30 words
A system as claimed in claim 3, wherein at least one temperature responsive sensor is adapted to containment at the source of electrical energy to comprise the heat control period.
Claim 6
Dependent Claim
55 words
The system of claim 3, the temperature responsive sensor comprising a double layer coaxial wire, the outer layer of which contains the heating element, and the inner layer containing temperature responsive means whereby thermal run away of the thyristor is prevented in the event of a break in the wire and failsafe condition is maintained.
Claim 7
Dependent Claim
57 words
In a system as claimed in claim 3 and including a double layer coaxial wire having an inner core attached to and forming a portion of said temperature responsive means, an insulating layer over said core and an outer layer being formed as a continuity of the control area in the blanket and to the control therefor.
Claim 8
Dependent Claim
39 words
In a system as claimed in claim 6, said wire further including a polyvinyl chloride coating, functioning of said inner core being unaffected by breakage of said outer layer whereby the inner core is operable for control shut off.
Claim 9
Dependent Claim
47 words
A system as claimed in claim 1, said actuator comprising an SCR thyristor, a first positive and a first negative temperature co-efficient temperature sensors connected to said SCR thyristor gate node whereby internal solid state junction molecular change and temperature build up during thyristor conduction is compensated.
Claim 10
Dependent Claim
35 words
A system as claimed in claim 8, said first positive and first negative coefficient temperature sensors connected to the gate node of said SCR thyristor being physically located on or in proximity to said thyristor.
Claim 11
Dependent Claim
49 words
A system as claimed in claim 8, comprising said first negative and said first positive coefficient temperature sensors connected to the gate node of said SCR thyristor in parallel to at least one second negative coefficient temperature sensor positioned physically in the area where temperature is to be controlled.
Claim 12
Dependent Claim
41 words
A system as claimed in claim 10, comprising at least one second positive coefficient temperature sensor connected electrically in parallel to said second negative coefficient temperature sensor and being positioned physically in the area where over heating is likely to occur.
Claim 13
Dependent Claim
33 words
A system as claimed in claim 8, wherein said SCR thyristor, said first positive and said first negative temperature coefficient temperature sensors are grown together comprising a single component integrated chip or circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |