Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1989-06-02
1991-01-15
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 18, 431 42, 320 21, 320 61, 136217, F23N 510
Patent
active
049849816
ABSTRACT:
A flame powered logic supply circuit (60) responds to a pilot flame (39b) and supplies electrical energy to power electronic logic circuitry (62) for a heater, such as a hot water heater (1), a furnace, or the like. A thermoelectric element (64) responds to the flame and outputs electrical current which is stored in an inductor (70). A pair of parallel circuit branches (78 and 80) are connected to the thermoelectric element (64) and the inductor (70). The first branch (78) has a semiconductor switch (82) with an on state during which current flow supplies energy to the inductor (70) which is stored therein. The second circuit branch (80) has a second energy storage component provided by a battery (90) which receives the stored energy from the inductor (70) during an off state of the semiconductor switch (82) to charge the battery (90) and maintain a given power rating thereof for powering electronic logic circuitry (62) of the heater. Monitoring circuitry is provided by a current sensing resistor (74) and a comparator (96) controlling the semiconductor switch (82) between its on and off states. Circuits (60, 60a) may be provided for both the pilot flame (39b) and a main burner flame (10a), or only for one or the other. The circuits (60, 60a) include indicia (94, 94a) providing a display indicating that each respective flame is lit and that energy is being supplied therefrom for powering the logic circuitry (62).
REFERENCES:
patent: 3820939 (1974-06-01), McKenna
patent: 3992137 (1976-11-01), Streisel
patent: 4236107 (1980-11-01), Templin
patent: 4770629 (1988-09-01), Bohan, Jr.
patent: 4778378 (1988-10-01), Dolnick et al.
patent: 4793799 (1988-12-01), Goldstein et al.
patent: 4847546 (1989-07-01), Bobier et al.
patent: 4862013 (1989-08-01), Koncopka
A. O. Smith Corporation
Price Carl D.
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