US3619097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety timed burner control system
Assignee: Honeywell Inc
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Filing: 1970-02-27
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Granted: 1971-11-09
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Expires: 1990-02-27
Abstract
Abstract A burner control system adapted to be connected to a fuel burner wherein a safety timing circuit is used to assure ignition of the burner fuel and subsequent proper operation of the burner. The safety timer circuit utilizes a capacitive voltage divider network that initially is supplied with energy at start up of the system, and which is subsequently supplied with energy from a flame rectification sensor in order to assure the ignition and continued operation through an ignition control means and a silicon-controlled spark-generating circuit. The sensing of flame also causes the shutdown of the silicon controlled spark ignition portion of the system.
Inventors
- 👤 Homer B Clay
- 👤 William Lloyd Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:08
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/12; F23N5/123; F23N5/20; F23N5/203; F23N2223/00; F23N2223/22; F23N2223/26; F23N2227/00; F23N2227/36; F23N2229/00; F23N2229/12; F23N2231/00; F23N2231/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
A burner control system adapted to be connected to a fuel burner and a source of alternating current voltage for safe operation of said fuel burner, including: safety timer means including energy storage means having slow energy drain means initially energized to an operable stage by application of said alternating current voltage to said system; said safety timer means having an input connected to rectification flame sensor means which upon sensing the existence of flame is capable of supplying energy to said energy storage means at a faster rate than said energy drain means is capable of depleting energy from said energy storage means; said safety timing means further having output circuit means; fuel control means and ignition means connected to said output circuit means to initiate operation of said system as long as said energy storage means maintains an adequate energy level; and said ignition means including rectification sensitive means connected to said rectification flame sensor means with said rectification sensitive means disabling said ignition means upon the existence of flame at said rectification flame sensor means.
Claim 2
Dependent Claim
178 words
A burner control system adapted to be connected to a fuel burner and a source of alternating current voltage for safe operation of said fuel burner, including: safety timer means including energy storage means having slow energy drain means initially energized to an operable stage by application of said alternating current voltage to said system; said safety timer means having an input connected to rectification flame sensor means which upon sensing the existence of flame is capable of supplying energy to said energy storage means at a faster rate than said energy drain means is capable of depleting energy from said energy storage means; said safety timing means further having output circuit means; fuel control means and ignition means connected to said output circuit means to initiate operation of said system as long as said energy storage means maintains an adequate energy level; and said ignition means including rectification sensitive means connected to said rectification flame sensor means with said rectification sensitive means disabling said ignition means upon the existence of flame at said rectification flame sensor means.
Claim 3
Dependent Claim
29 words
A burner control system as described in claim 1 wherein said energy storage means is capacitive voltage divider means and rectification means connected to said alternating current voltage source.
Claim 4
Dependent Claim
21 words
A burner control system as described in claim 2 wherein said energy drain means is at least one resistive electrical circuit.
Claim 5
Dependent Claim
45 words
A burner control system as described in claim 3 wherein said fuel control means includes a silicon controlled rectifier for operation of a fuel supply for said fuel burner, and said ignition means includes a relaxation oscillator type of silicon controlled rectifier spark ignition circuit.
Claim 6
Dependent Claim
63 words
A burner control system as described in claim 4 wherein said safety timer means includes a field effect transistor for control of said fuel control means and said ignition means with said capAcitive voltage divider means connected to a gate of said field effect transistor to control the operation of said transistor when sufficient energy is received from said rectification flame sensor means.
Claim 7
Dependent Claim
61 words
A burner control system as described in claim 5 wherein said silicon controlled rectifier relaxation oscillator of said spark ignition circuit includes an input circuit controlled by a second field effect transistor of said rectification sensitive means in response to current from said rectification flame sensor means to disable said ignition means when flame is present at said flame sensor means.
Claim 8
Dependent Claim
171 words
A burner safety timer control circuit adapted to be connected to a source of alternating current voltage and to rectification flame sensor means of a fuel burner, including: capacitive voltage divider means and rectification means connected to said alternating current voltage source upon energization of said burner control circuit to supply an initial charge to said capacitive voltage divider means; current drain means connected to said capacitive voltage divider means to slowly drain said capacitive voltage divider means of said initial charge; high impedance solid-state current control means having an input connected to said capacitive voltage divider means and output means adapted to be connected to operate said fuel burner when said capacitive voltage divider means charge is maintained; and connection means adapted to connect said rectification flame sensor means to said capacitive voltage divider means to supply a charge to said capacitive voltage divider means when said fuel burner has a proper flame to maintain said charge and keep said solid-state current control means output means operating said fuel burner.
Claim 9
Dependent Claim
171 words
A burner safety timer control circuit adapted to be connected to a source of alternating current voltage and to rectification flame sensor means of a fuel burner, including: capacitive voltage divider means and rectification means connected to said alternating current voltage source upon energization of said burner control circuit to supply an initial charge to said capacitive voltage divider means; current drain means connected to said capacitive voltage divider means to slowly drain said capacitive voltage divider means of said initial charge; high impedance solid-state current control means having an input connected to said capacitive voltage divider means and output means adapted to be connected to operate said fuel burner when said capacitive voltage divider means charge is maintained; and connection means adapted to connect said rectification flame sensor means to said capacitive voltage divider means to supply a charge to said capacitive voltage divider means when said fuel burner has a proper flame to maintain said charge and keep said solid-state current control means output means operating said fuel burner.
Claim 10
Dependent Claim
38 words
A burner safety timer control circuit as described in claim 7 wherein said high impedance solid state current control means is a field effect transistor having a gate as said input connected to said capacitive voltage divider means.
Claim 11
Dependent Claim
37 words
A burner safety timer control circuit as described in claim 7 wherein said capacitive voltage divider means includes a pair of capacitors, and said rectification means is diode means in series circuit with said pair of capacitors.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |