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Patent US3751212A successfully refreshed from Google Patents.
US3751212A
Expired / Lapsed
US
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Fuel burner control system
Assignee: Honeywell Inc
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Filing: 1972-06-29
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Granted: 1973-08-07
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Expires: 1992-06-29
Abstract
Abstract An all solid state control system which is adapted to be connected to a fuel burner is disclosed that uses a pair of solid state switches each having a radiation responsive gating means that is responsive to a single radiation generator means. The first solid state switching means is gated ''''on'''' to energize the fuel burner or load, while the second radiation responsive gating means is gated ''''on'''' to continuously energize the radiation generator means to act as a latching mechanism to hold the system energized. The radiation generator means is initially energized through a flame responsive circuit and thermostat to initiate operation of the system.
Inventors
- 👤 R Hron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:28
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N5/203; F23N5/02; F23N5/08; F23N5/082; F23N2223/00; F23N2223/20; F23N2229/00; F23N2239/00; F23N2239/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A fuel burner control system including: transformer means having a primary winding and a secondary winding with said primary winding adapted to be connected to a source of voltage; gated solid state switch means including radiation responsive gating means for control of said switch means with said switch means adapted to connect a fuel burner to said source; flame responsive circuit means having normally closed safety switch contact means and second gated solid state switch means; said second gated solid state switch means adapted to be connected to flame responsive resistor means; said second gated solid state switch means, safety switch operator means, and radiation generator means forming a series circuit which is adapted to be connected to said secondary winding through said normally cLosed safety switch contact means by condition responsive means; and third gated solid state switch means including second radiation responsive gating means for control of said third solid state switch means connecting said secondary winding to a junction between said operator means and said radiation generator means; both said radiation gating means being responsive to only the radiation from said radiation generator means.
Claim 2
Dependent Claim
187 words
A fuel burner control system including: transformer means having a primary winding and a secondary winding with said primary winding adapted to be connected to a source of voltage; gated solid state switch means including radiation responsive gating means for control of said switch means with said switch means adapted to connect a fuel burner to said source; flame responsive circuit means having normally closed safety switch contact means and second gated solid state switch means; said second gated solid state switch means adapted to be connected to flame responsive resistor means; said second gated solid state switch means, safety switch operator means, and radiation generator means forming a series circuit which is adapted to be connected to said secondary winding through said normally cLosed safety switch contact means by condition responsive means; and third gated solid state switch means including second radiation responsive gating means for control of said third solid state switch means connecting said secondary winding to a junction between said operator means and said radiation generator means; both said radiation gating means being responsive to only the radiation from said radiation generator means.
Claim 3
Dependent Claim
48 words
A fuel burner control system as described in claim 1 wherein said first solid state switch means is a triac, said second and third solid state switch means are silicon controlled rectifiers, and said secondary winding has a tap for connection to said third solid state switch means.
Claim 4
Dependent Claim
22 words
A fuel burner control system as described in claim 2 wherein both of said radiation responsive gating means are light responsive resistors.
Claim 5
Dependent Claim
19 words
A fuel burner control system as described in claim 3 wherein said radiation generator means is an incandescent light.
Claim 6
Dependent Claim
54 words
A fuel burner control system as described in claim 4 wherein said series circuit includes a parallel combination of a diode and a resistor to allow said incandescent light to be energized by voltage from said secondary winding on each half cycle of said source by conduction of both of said silicon controlled rectifiers.
Claim 7
Dependent Claim
64 words
A fuel burner control system as described in claim 5 wherein a thermostat heater resistor is placed in parallel circuit with said parallel combination of said diode and resistor, and said incandescent light to provide for an adequate current flow in said condition responsive means when said condition responsive means is activated to energize said incandescent light through said last named silicon controlled rectifier.
Claim 8
Dependent Claim
73 words
A fuel burner control system as described in claim 6 wherein said safety switch operator means is a resistor, and said operator means is operatively energized during the absence of a flame in said burner to open said normally closed safety switch contact means to de-energize and mechanically lock out said flame responsive circuit means and said incandescent light after a pre-selected time to be determined by the heating of said heater means.
Claim 9
Dependent Claim
29 words
A fuel burner control system as described in claim 7 wherein said light responsive resistors are both cadmium sulfide cells having relatively long memories of the light incident thereon.
Claim 10
Dependent Claim
20 words
A fuel burner control system as described in claim 1 wherein said radiation generator means includes light emitting diode means.
Claim 11
Dependent Claim
25 words
A fuel burner control system as described in claim 1 wherein said radiation generator means includes a full-wave rectifier bridge and a light emitting diode.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |