Patent US3649853A successfully refreshed from Google Patents.
US3649853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heat control system
Assignee: KALGLO ELECTRONICS CO Inc
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Filing: 1970-04-15
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Granted: 1972-03-14
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Expires: 1990-04-15
Abstract
Abstract The system of the invention includes a bridge circuit adapted to sense changes in the desired and set temperature of apparatus at a remote location. The system includes means for sensing unbalance in the bridge due to a change in the temperature of the apparatus at the remote location, the circuit including means for responding to the bridge unbalance and firing or operating a control circuit and a heating circuit for heating the apparatus.
Inventors
- 👤 Charles F Kerchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:53
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
223 words
An electronic heat control circuit comprising an input power source, a load and a first gate connected across said power source, said input power source being coupled to the primary winding of a transformer having a secondary winding, a pilot light connected across said secondary winding, one end of said secondary winding being connected to one end of a first circuit including a resistor, a pilot light, and the primary winding of a power transformer, all connected in parallel, said poWer transformer being coupled to said first gate and said load, the other end of said secondary winding and the other end of said first circuit being coupled through a full wave rectifier across a resistance bridge circuit, said bridge circuit including first and second legs, one of which includes fixed resistors and the other of which includes a thermistor and a variable resistor, a cross arm between said legs including active circuit elements which respond to bridge unbalance to generate a signal, a normally blocking second gate connected across said bridge, said active circuit elements including means coupled to said second gate for unblocking said gate and permitting current to flow therethrough whereby voltage is coupled through said power transformer to said first gate whereby said first gate is operated and unblocked to permit input power to be applied to said load.
Claim 2
Dependent Claim
223 words
An electronic heat control circuit comprising an input power source, a load and a first gate connected across said power source, said input power source being coupled to the primary winding of a transformer having a secondary winding, a pilot light connected across said secondary winding, one end of said secondary winding being connected to one end of a first circuit including a resistor, a pilot light, and the primary winding of a power transformer, all connected in parallel, said poWer transformer being coupled to said first gate and said load, the other end of said secondary winding and the other end of said first circuit being coupled through a full wave rectifier across a resistance bridge circuit, said bridge circuit including first and second legs, one of which includes fixed resistors and the other of which includes a thermistor and a variable resistor, a cross arm between said legs including active circuit elements which respond to bridge unbalance to generate a signal, a normally blocking second gate connected across said bridge, said active circuit elements including means coupled to said second gate for unblocking said gate and permitting current to flow therethrough whereby voltage is coupled through said power transformer to said first gate whereby said first gate is operated and unblocked to permit input power to be applied to said load.
Claim 3
Dependent Claim
48 words
The circuit defined in claim 1 wherein said active elements include a pair of transistors coupled to a capacitor which is charged when said transistors turn on, and a unijunction transistor coupled to said capacitor and having an output coupled to said second gate for operating the same.
Claim 4
Dependent Claim
131 words
An electronic heat control system comprising an alternating current voltage source providing a cyclically varying input voltage, a first transformer having a primary winding and a secondary winding with said primary winding being connected across said voltage source, a second transformer having a primary winding and a secondary winding with the primary winding being connected in series with the secondary winding of said first transformer and the secondary winding being connected to a load circuit, and a variable resistance circuit connected across the series combination of said secondary winding of said first transformer and the primary winding of said second transformer, the resistance of said variable resistance circuit determining whether current flows through the second transformer to said load circuit in any portion of the input signal from said voltage source.
Claim 5
Dependent Claim
131 words
An electronic heat control system comprising an alternating current voltage source providing a cyclically varying input voltage, a first transformer having a primary winding and a secondary winding with said primary winding being connected across said voltage source, a second transformer having a primary winding and a secondary winding with the primary winding being connected in series with the secondary winding of said first transformer and the secondary winding being connected to a load circuit, and a variable resistance circuit connected across the series combination of said secondary winding of said first transformer and the primary winding of said second transformer, the resistance of said variable resistance circuit determining whether current flows through the second transformer to said load circuit in any portion of the input signal from said voltage source.
Claim 6
Dependent Claim
63 words
The system defined in claim 3 wherein said variable resistance circuit comprises a Wheatstone bridge and circuit means are coupled thereto for reducing the effective resistance of said bridge to zero at a selected point during each cycle of said input alternating current, if said bridge is unbalanced, whereby operating voltage can be applied to said second transformer and to said load circuit.
Claim 7
Dependent Claim
24 words
The system defined in claim 3 wherein a plurality of load circuits in parallel are connected across the secondary winding of said second transformer.
Claim 8
Dependent Claim
29 words
The system defined in claim 3 wherein said load circuit includes a third power transformer coupled between said second power transformer and a series-connected switch and heating load element.
Claim 9
Dependent Claim
30 words
The system defined in claim 5 wherein each said load circuit includes a third power transformer coupled between said second power transformer and a series-connected switch and heating load element.
Claim 10
Dependent Claim
58 words
The system defined in claim 3 and including a first pilot light across the secondary winding of said first transformer and a second pilot light across the primary winding of said second transformer, said first pilot light indicating the presence of an input signal and said second pilot light indicating the state of conduction of said load circuit.
Claim 11
Dependent Claim
80 words
The system defined in claim 4 wherein said bridge includes a capacitor coupled thereto and chargeable due to current flow therefrom when said bridge is unbalanced, a first switch coupled to said capacitor and adapted to operate and generate a pulse when said capacitor reaches a selected charged state, a second switch coupled to said first switch and adapted to be operated thereby to short circuit said bridge and to thereby permit current to flow through said second power transformer.
Claim 12
Dependent Claim
153 words
An electronic heat control system comprising a source of input power connected to a first tranSformer, a second power transformer in series with said first transformer, a resistance bridge circuit including a first gate connected across said first and second power transformers, a load circuit including a third power transformer and a second gate connected across said second power transformer, said bridge circuit drawing current preferentially rather than said load circuit when said bridge circuit is unbalanced, said bridge circuit including active circuit elements responsive to bridge circuit unbalance to generate a signal and to couple said signal to said first gate and thereby to operate said first gate, operation of said first gate causing input power to flow through said second power transformer and then to said third power transformer to said second gate for operating the same and thereby permitting power from said input source to flow to said load circuit.
Claim 13
Dependent Claim
153 words
An electronic heat control system comprising a source of input power connected to a first tranSformer, a second power transformer in series with said first transformer, a resistance bridge circuit including a first gate connected across said first and second power transformers, a load circuit including a third power transformer and a second gate connected across said second power transformer, said bridge circuit drawing current preferentially rather than said load circuit when said bridge circuit is unbalanced, said bridge circuit including active circuit elements responsive to bridge circuit unbalance to generate a signal and to couple said signal to said first gate and thereby to operate said first gate, operation of said first gate causing input power to flow through said second power transformer and then to said third power transformer to said second gate for operating the same and thereby permitting power from said input source to flow to said load 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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |