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Burner control with interrupted ignition
| Details |
Inventors: Santo, Eugenio Espiritu;
Assignee: Sundstrand Corporation (Rockford, IL)
Primary Examiner: Favors; Edward G.
Assistant Examiner:
Attorney, Agent or Firm: Killingsworth; Ted E., McMurry; Michael B.
An interrupted ignition system for a burner control circuit having a primary side which has as its primary function the application of a line voltage to a burner motor and a fuel igniter and a secondary side, which is responsive to a thermostat, and includes a light sensitive element for detecting a flame at the burner plus a current responsive element which in combination with a circuit breaking switch in the primary functions as a circuit breaker for disconnecting the igniter and motor from the line voltage under certain conditions. The igniter is controlled by a triac switch in the primary side which in turn is responsive to an optical coupler connected to the secondary side of the burner control circuit. When the thermostat contacts are closed, thereby indicating a call for heat, the optical coupler will cause the triac to switch on resulting in current flow through the igniter. With the detection of a flame by the flame cell, the optical coupler will be shut off resulting in the switching off of the triac and the discontinuation of current through the igniter, thus permitting a reduction in the overall electrical power consumption of the system. In the event the flame should be lost, the optical coupler will again switch on the igniter until either a flame is detected or the circuit breaker opens disconnecting the primary side is disconnected from the line voltage. |
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DETAILED DESCRIPTION OF THE INVENTION The preferred embodiment of the invention is illustrated in FIG.
1 and is composed of a burner control circuit having a primary circuit 10 and a secondary circuit 12.
The primary circuit 10 is operatively coupled to the secondary circuit 12 by means of a transformer 14.
The primary circuit 10 is connected across a line voltage, typically 115-120 volts AC, by means of terminals 16 and 18.
Associated with the primary circuit are a burner motor 20 and an igniter 22.
The function of the motor 20 is to atomize the fuel oil and force it through or by the spark gap 24 of the igniter 22, thus causing the ignition of the fuel oil.
Controlling the application of the line voltage across the motor 20 and igniter 22 is a switch 26 which, in the preferred embodiment, is a triac type device.
The triac 26 responds to a reduced electrical resistance in a light sensitive element C1 that is connected by line 28 to the gate of the triac 26.
Light sensitive element C1 forms a portion of an optical coupler L1-C1 having its light source L1 located in the secondary circuit 12 and where the operative relationship is indicated by the dashed line 30.
When a light is applied to the light sensitive element C1 from light source L1 of the optical coupler, electrical resistance of C1 is substantially reduced, thus allowing a voltage to be applied to the gate of triac 26.
This will serve to switch on triac 26 resulting in the line voltage being applied across both the motor 20 and the igniter 22.
In the preferred embodiment of the invention, triac 26 is controlled by the optical coupler L1-C1 but it is apparent that this essentially relay type function could be accomplished by a wide variety of relay elements including an electromechanical relay.
In addition to the triac 26, the primary 10 contains a circuit breaking switch 32 which in turn is controlled by a heat or current sensitive element 34 in the secondary 12.
This control relationship is indicated by the dashed line 36.
The combination of the current sensitive element 34 and the switch 32 is equivalent to, and can be implemented by a wide variety of commercially available circuit breakers
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