US3832123A - Burner control system - Google Patents

Burner control system Download PDF

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Publication number
US3832123A
US3832123A US00306591A US30659172A US3832123A US 3832123 A US3832123 A US 3832123A US 00306591 A US00306591 A US 00306591A US 30659172 A US30659172 A US 30659172A US 3832123 A US3832123 A US 3832123A
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United States
Prior art keywords
electronic switch
ignition
flame
energy
valve
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Expired - Lifetime
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US00306591A
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English (en)
Inventor
L Walbridge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BLOOM-1 Inc A CORP OF
Kidde Inc
Kidde Fenwal Inc
Original Assignee
Walter Kidde and Co Inc
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Filing date
Publication date
Application filed by Walter Kidde and Co Inc filed Critical Walter Kidde and Co Inc
Priority to US00306591A priority Critical patent/US3832123A/en
Priority to CA185,621A priority patent/CA1005552A/en
Priority to AU62421/73A priority patent/AU6242173A/en
Priority to FR7341521A priority patent/FR2215131A5/fr
Priority to JP48128770A priority patent/JPS4986923A/ja
Application granted granted Critical
Publication of US3832123A publication Critical patent/US3832123A/en
Assigned to KIDDE, INC. reassignment KIDDE, INC. MERGER (SEE DOCUMENT FOR DETAILS). FILED MARCH 31, 1988, DELAWARE Assignors: HIMP-2 INC., HIMP-2 INC. (CHANGED TO)
Assigned to FENWAL INCORPORATED, A CORP. OF DE reassignment FENWAL INCORPORATED, A CORP. OF DE NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: KIDDE, INC.
Assigned to BLOOM-1 INC., A CORP. OF DE reassignment BLOOM-1 INC., A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 3/31/88, DELAWARE Assignors: KIDDE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/12—Flame sensors with flame rectification current detecting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/06—Fail safe for flame failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/12—Fail safe for ignition failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays

Definitions

  • the capacitor is precharged to open the valve and is kept charged by the sensor if flame is achived. If no flame is achieved before the capacitor becomes discharged, the valve closes and the system shuts down.
  • the unsafe condition can occur in this circuit, for example, if flame is lost or never established, but a malfunction in the precharging circuit keeps the capacitor'charged and thus the valve open. This is a result of having to fool" the system by precharging.
  • the object of this invention is to provide a burner control system that automatically activates the system for a fuel burner comprising a valve apparatus that controls the flow of fuel to the burner, and a spark ignition apparatus.
  • a flame detector circuit is also included.
  • a first electronic switching apparatus is energizable to open the valve and start the ignition apparatus.
  • a second electronic switching apparatus is coupled to the flame detector circuit, and, in response to a signal indicating the presence of a flame, maintains the valve in its open position and, through an ignition interruptions apparatus, inhibits the first switch apparatus. As long as power is supplied to the control system, the first switch is automatically enabled in the absence of a signal from the ignition interruption apparatus.
  • a control circuit that automatically reestablishes flame in the event of a loss thereof by immediately enabling the first switch to start the ignition apparatus and maintain the valve in an open position.
  • An advantage of providing two switches, each of which is capable of maintaining the valve in an open position, is that'many of the dangers experienced with precharging circuits, such as maintaining the valve in an open position without flame, are eliminated.
  • a separate three terminal solid state element for example a silicon controlled rectifier, forms the active element of each of the electronic switching apparatus.
  • a circuit v utilizing three terminal devices is rendered significantly more failsafe than conventional relay controlled circuitry. This is so because conventional circuits utilize multiple pole relays with contacts controlling a plurality of separate switching circuits.
  • valve and the ignition apparatus are generally controlled by separate circuits; Therefore a component failure in either circuit, or a pair of relay contacts sticking together can igniter to reestablish flame in the event of a loss thereof.
  • a failure to establish flame occurs, either initially or after a loss of flame, the valve be closed after a predetermined time.
  • the system be rendered fail safe, that is, malfunction of any component or group of components shall not lead to an unsafe condition.
  • the invention is characterized by a burner control cause the valve to remain open without activating the ignition apparatuslHowever, such an event is less likely to occur in the subject control system inasmuch as SCRs function as if they were two terminal SPST devices. therefore, the single SCR in the first switch both energizes the spark apparatus and opens the valve with the equivalent of only one pair of contacts. Thus, for example, it is unlikely that one of these functions will .be performed in response to the first SCR without the other function being performed also.
  • a feature of the invention is the inclusion of a delay timer apparatus in the first switch inconjunction with a flame detector system.
  • the timer prevents the enabling of the first electronic switching apparatus until the timer has timed out in a predetermined delay time.
  • the flame rectification detector fires the SCR in the second electronic switch apparatus once during each cycle of the ac. voltage supplied to power the burner control system. Pulses caused by the conduction of the SCR in the second switch are coupled to the delay timer by a periodic reset apparatus and each pulse resets the delay timer. Since the delaytime is selected to be longer than the period of the alternating supply voltage the delay timer can never time out if the flame rectification detector circuit is sensing flame.
  • the delay timer is no longer reset and it quickly times out. Thereafter the first electronic switch is enabled and the ignition apparatus is energized.
  • the ignition apparatus is energizedin an effort to reestablish flame when flame is lost, and furthermore that the ignition apparatus is deenergized upon establishing flame.
  • Another feature of the invention is the inclusion of a circuit to lock out after a predetermined period of ignition unless flame is sensed. This is important inasmuch as the valve is open while the first electronic switch is activated so that if there is a malfunction in the ignition apparatus, the valve is releasing fuel into the atmosphere with no change of the ignition thereof.
  • Power is supplied to the burner control system through the circuit breaker.
  • a wave shaping control circuit within the burner system causes the silicon controlled rectifier in the first electronic switch to conduct for a substantially longer duty cycle than is exhibited by the SCR in the second electronic switch.
  • operation of the first electronic switch causes power to be drawn directly from the power supply, but as will be explained below, normal operation of the second switch does not.
  • FIG. I is an operational diagram of a preferred burner control system
  • FIG. 2 is a schematic diagram of the preferred system
  • FIG. 3 shows various wave forms at different points within the circuit shown in FIG. 2.
  • FIG. 1 there is an operational diagram of a preferred burner control system 21.
  • the diagram of FIG. 1 is not a con ventional block diagram.
  • the lines coupling the blocks in FIG. 1 may indicate either electrical or mechanical coupling. It is however, felt that an understanding of the diagram shown in FIG. 1 will simplify comprehension of the operation of the circuit shown in FIG. 2.
  • the system 21 is powered by an ac. power source (not shown).
  • a delay time 22 that is part of a first electronic switch 23 begins to time out in a predetermined delay time that is longer than one cycle of the ac. supply current.
  • the delay timer 22 enables a first silicon controlled rectifier 24 through a line 25.
  • the first silicon control rectifier 24 fires once during each cycle of the ac. current as long as a signal remains on the line 25.
  • the signal on the line 25 is carried to a shut down timer 26 that begins timing out in a preselected shut down time when enabled. If the shut down timer 26 times out, a signal delivered on a line 27 to a lock out apparatus 28 causes the system 21 to lock out. Firing of the first SCR 24 produces a signal on a line 29 that performs three functions.
  • An igniter 31 is energized in response to a signal on the line 29 and a fuel valve 32 is opened in response thereto.
  • fuel is supplied to a burner (not shown) and the igniter 31 seeks to ignite the fuel.
  • an ignition timer 33 begins running in response to the signals on the line 29. If the ignition timer 33 times out indicating that the first SCR 24 has been firing for a preselected period of time, a signal on a line 34 is delivered to the lock out apparatus 28 thus locking out the system 21.
  • the first SCR 24 fires whenever there is a signal on the line 25.
  • the presence of a signal on the line 25 starts operation of both the shut down timer 26 and the ignition timer 33.
  • the lock out apparatus 28 When either timer 26 or 33 times out, the lock out apparatus 28 is activated.
  • the two timers 26 and 33 are both ignition timers and the provision of two separate timers is a safety feature.
  • Disposed near the burner is a flame sensor 35 that fires a second SCR through a line 37 once each cycle of ac. power when flame is sensed.
  • the signal on the line 37 is delivered to the second SCR 36, it fires producing pulses on a line 38 that maintain the valve 32 in an open position and resets the delay timer 22 through a periodic reset line 39.
  • the delay timer 22 times out in the delay time of greater than one cycle of the ac. supply voltage.
  • the first SCR 24 begins to tire and the shut down timer 26 and the ignition timer 33 begin to run.
  • the igniter 31and fuel valve 32 are energized. Under normal circumstances flame will be established before either the shut down timer 26 or the ignition timer 33 has'timedout. In that event, the flame sensor 35 begins firing the secondSCR 36 which maintains the valve 32 in an open position and, upon firing once eachcycle of the supply voltage, resets the delay timer 22 through the periodic reset line 39.
  • the delay timer 32 is prevented from timing out while the second SCR 36 is firing.
  • the shut down timer 26 and the first SCR 24 are inoperable. If flame is lost, the second SCR 36 ceases firing the delay timer 22 soon times out thus causing the first SCR 24 to resume firing. Consequently the effect of a loss of flame is that the system behaves as it does when initially energized. Thus if flame is reestablished the second SCR 36 begins to fire again and the'first SCR 24 is inactivated and the shut down timer 26 is periodically reset.
  • the system 21 is locked out upon the timing out of either the shut down timer or the ignition timer 33.
  • FIG. 2 there is a schematic diagram of the burner control system 21. Portions of the circuit corresponding to the blocks in FIG. 1 have been pointed out with similar reference numerals where possible.
  • a hot" line 41 in an ac. power supply in connected to a buss 42 by a switch 43 such as, for example, a thermostat.
  • a grounded line 44 is connected to a lock out thermal circuit breaker 45, that is part of a power input apparatus, so that the current flowing through the line 44 passes through an energy accumulating bimetalic strip member 33.
  • a threshold member 34 in the circuit breaker 45 separates switch deactivator lock out contacts 28 in the event of a circuit breaker overload as evidenced by an excessive amount of heat building up in the bimetalic member 33.
  • the heat energy in the bimetalic member 33 is supplied by heating caused by current flowing therethrough and the surface of the bimetalic element 33 radiates heat from the strip 33 to the atmosphere and thus comprises an energy leakage system. Because energy is radiated by the surface of the bimetalic strip 33, the circuit breaker 45 will not respond to energy supplied thereto at a low rate.
  • the circuit breaker 45 connects the grounded line 44 to a junction 46.
  • the power supplied on the lines 41 and 44 is alternating current and the term positive half cycle means that half of the cycle of the alterntating current in which the line 44 is positive with respect to the line 41. It will be appreciated that the absolute potential on the grounded line 44 does not change and that changes in voltage refer only to relative values with respect to power line 45.
  • Controlled by the system is a fuel burner 47 that is grounded and is supplied with fuel through a line 48 in response to a valve control apparatus 32 including a valve control relay coil 49 that is shunted by a capacitor 51.
  • a valve control apparatus 32 including a valve control relay coil 49 that is shunted by a capacitor 51.
  • a diode 52 couples the coil 49 and capacitor 51 combination across a resistor 53.
  • One end of the coil 49 is connected to the common buss 42 along with one end of the capacitor 51 and the resistor 53.
  • the other end of the resistor 53 is connected in series with a capacitor 54 and thence another resistor 55.
  • the resistor 55 is connected to a spark capacitor 57, the other end which is connected to the buss 42.
  • the junction is also connected to the anode of the second SCR 36 by a diode 106 and a resistor 89.
  • the capacitors 54 and 57 charge through the spark igniter apparatus 31 that includes a resistor 58 and diode 59 in series with a primary winding 61 of a spark transformer 62. Current flow in the above described spark circuit is prevented during negative half cycles of the supply voltage by the diode 59.
  • a secondary winding of the transformer 62 with two spark electrodes 64 and 65 connected thereto. The magnitude of the charging current is insufficient to cause sparking between the electrodes.
  • the flame rectification flame detector apparatus 35 includes a resistor 66 connected between the electrode 65 and aflame rectification capacitor 67. The other terminal of the capacitor 67 is connected to the buss 42. Shunting the capacitor 67 is a resistor 68 and connected to a parallel combination of a capacitor 69 and complementary silicon controlled rectifier 71 by another resistor 72. Two capacitors 73 and 74 connected in series and joined at a junction 75 shunt the complimentary silcon con trolled rectifier 71.
  • a resistive voltage divider including a resistor 76 and a resistor 77 spanning from the junction 46 to the buss 42 supplies current to the gate 78 of the complementary silicon controlled rectifier 71.
  • the first electronic switch apparatus 23 including the first SCR 24 is made to conduct by applying a voltage to a junction 81 that powers a voltage divider control including two resistors 82 and 83 that supply current to the gate 84 of the SCR 24.
  • the second electronic switch apparatus 85 including the second SCR 36 receives power from the junction 46 through a resistor 86, a diode 87, a inhibit diode 88 and another resistor 89.
  • the preceding circuit is a cut off control circuit 90.
  • the gate 91 of the SCR 36 is connected to the junction by the line 37 and to the buss 42 by a resistor 92.
  • the delay timer clamping capacitor 22 connects a periodic reset line 94 to the buss 42.
  • the cut off circuit 90 and the delay timer clamping capacitor 22 are part of an ignition interruption apparatus that deenergizes the ignition apparatus 31 upon the sensing of a flame by the flame sensor 35 as will be described more fully below.
  • the shut down timer 26 includes an energy accumulator capacitor 95 and a leakage resistor 96 in series and connected between the line 94 and the buss 42.
  • a junction 97 between capacitor 95 and the resistor 96 is coupled to the gate 98 of a shut down silicon controlled rectifier 99 by a neon bulb 101.
  • a capacitor and a resistor are connected in parallel between the gate 98 and the cathode of the SCR 99 and the anode is coupled to the line 94 by a resistor 105. Any energy absorbed by the capacitor is leaked off through the leakage resistor 96 when the second SCR 36 is firing as described below.
  • the SCR 99 acts as a controlling apparatus for the first SCR 24 so that the SCR 24 conducts.
  • a control circuit 102 including a capacitor 103 and a neon bulb 104 supplies current to the gate 84' of the first SCR 24 through the junction 81. The capacitor is charged through a resistor 105.
  • FIG. 30' there are shown charging curves for the capacitors 103, 22 and 95. It is to be understood that no specific time constants are shown because theexact time constants are less important than the relationship among the three charging time constants. It should be further understood that the curves shown are for charging each capacitor disregarding the effect of the other capacitors. Specifically, the clamping action of the capacitor 22 on the capacitor 95 is ignored in FIG. 3a. The time t represents approximately one cycle of the alternating supply voltage. Thus it is seen. by a curve 111 that in this example the capacitor 103 is nearly fully charged after one cycle. The delay capacitor 22, as represented by a curve 112, requires several cycles to obtain a substantial charge and the capacitor 95 requires many cycles as shown by a curve 113. The capacitor 95 could, for example, take approximately 10 seconds to charge.
  • a sine wave form 121 shown in FIG. (3b) represents the alternating current power supplied to the system 21 and is used to establish a time scale for FIGS. 3(c) (f).
  • a curve 122 in FIG. 3(0) showsthe delay capacitor 22. A small amount of charge is gained during each positive half cycle of the sine wave 121 and the charge on the capacitor 22 remains constant during negative half cycles.
  • the charge on the capacitor 103 is shown by a wave form 123 in FIG. 3(d).
  • the capacitor 103 can substantially charge during one positive half cycle of the sine wave 121. However, during the positive half cycles the diode 87 is forward biased and thus is conductive so that the charging of the capacitor 103 is initially delayed by the clamping of the delay clamping capacitor 22 as shown in FIGS. 3(a) and (d).
  • the capacitor 22 After several cycles the capacitor 22 approaches full charge each cycle and allows the capacitor 103 to fire the neon bulb 104. Firing occurs at near the peak of the positive half cycle of the sine wave 121 as shown at the points 124 in FIG. 3(d). Discharge of the capacitor then proceeds through the bulb 104 and the wave shaping resistors 82 and 83 to supply current that causes the first SCR 24 to conduct.
  • the resistor 82 length the discharge period of the capacitor 103 so as to prolong the current input to the gate 84 and thereby the conduction period of the SCR 24.
  • the bulb 104 stops conducting and the discharge proceeds as shown by the curved portion 125 of the wave form 123.
  • the first SCR 24 conducts during half of the positive half cycle as shown by a wave form 126 in FIG. 3(e).
  • the capacitors 54 and 57 absorb substantially a full charge during each positive half cycle of the wave form 121, they supply a substantial current to the primary winding 61. as they discharge through the SCR 24. This current creates sufficient power in the secondary winding 63 to cause a spark between the electrodes 64 and 65.
  • the discharge of the capacitor 54 creates a current through the resistor 53 and a voltage drop thereacross as indicated in FIG. 2. This voltage drop forward biases the blocking diode 53 and thus activates the relay coil 49.
  • the first firing of the second 36 occurs precisely at the conclusion of a conducting cycle of the first SCR 24.
  • the capacitors 54 and 57 have been previously discharged by the first SCR 24.
  • the first firing and each subsequent firing of the second SCR 36 discharges the delay capacitor 22 through the inhibit diode 88.
  • the delay capacitor 22 requires several cycles before a sufficient charge can be built up to permit the first SCR 24 to fire, the first SCR 24 does not fire when the second SCR 36 is firing.
  • the capacitor 54 and 57 each continueto absorb a full charge during each positive half cycle of the wave form 121. However, discharge is now through the second SCR 36. Thus the voltage is still produced across the resistor 53 to maintain the valve in open position, however, the primary winding 61 of the transformer 62 is bypassed and thus the spark ignition apparatus 31 is deenergized' and the spark is extinguished. This mode of operation continues as long as flame is sensed.
  • the large conductingportion 134 corresponds in shape to the firing of the first SCR 24 as shown in FIG. 3(a) and indeed represents the firing of the first SCR.
  • the first SCR 24 conducts such a large current because it fires during the positive half cycles of the supply voltage and thus a current path is established from the junction 46 through the resistor 58, the diode 59 and the SCR 24 to the buss 42.
  • FIG. 30' shows a wave form indicating current passed by the lock out circuit breaker 45 when the second SCR is firing.
  • Small lobes 135 correspond to the charging of the capacitors shown by the lobes 133.
  • the preignition timing may be extended to provide substantial purge time and the ignition timer may be adapted to closing the valve without opening the circuit breaker using conventional circuitry. It is therefore, to be understood that'within the scope of the appended claims the invention can be practised otherwise than as specifically described.
  • a burner control system comprising: 1
  • valve means for controlling the flow of fuel to a burner; ignition means energizable to ignite fuel emanating from the burner; flame detector means for detecting the presence of flame at the burner; first electronic switch means enableable to both activate said valve means to initiate fuel flow to the burner and energize said ignition means.
  • second electronic switch means for maintaining said valve means in a condition wherein fuel is supplied to the'hurncr in response to signals from said flame. detector means;
  • ignition interruption means or deenergizing said ignition means.
  • said ignition interruption means comprises cut-offmeans responsive to said second electronic switch means for disenabling said first electronic switch meanswhen flame is sensed by said flame detector means.
  • said flame detector means comprises electrode means supplied with alternating electric current and disposed to be bathed by the flame and direct current detection means for detecting the flow of rectified current through the flame.
  • said ignition interruption means comprises delay timer means for disenabling said first switch means until said delay timer means has timed out in a predetermined delay time
  • said cut-off means comprises inhibit means for deactivating said delay timer means and thereby disenabling said first switch means.
  • cut-off means comprises periodic reset means for periodically resetting said delay timer at intervals shorter than said predetermined delay time when the presence of a flame is sensed.
  • said delay timer comprises clamping means responsive to said periodic reset means for clamping the power supplied to said first switch means.
  • said clamping means comprises a clamping capacitor that is periodically discharged by said periodic reset means.
  • a system according to claim 6 comprising ignition timer means for timing the operation of said ignition means and including power input means for supplying power to said burner control system and further comprising switch deactivator means for disenabling said first electronic switch means in response to timing out of said ignition timer means in a predetermined period of time.
  • said switch deactivator means comprises energy accumula tion means for normally receiving energy at a first rate through said first electronic switch means and comprising threshold means for disconnecting power from said control system after the accumulation of a predetermined amount of energy.
  • switch deactivator means comprises lock out thermal circuit breaker means.
  • a system according to claim 10 wherein said energy accumulation means comprises leakage means for 14.
  • a system according to claim 13 comprising control circuit means for causing said first controlled rectifier to conduct for a longer duty cycle than that of said second silicon controlled rectifier.
  • a system according to claim 12 comprising ac. power supply means for rendering said first electronic switch means conductive during one half cycle of the ac. power supplied and wherein said second electronic switch means is conductive during the alternate half cycle of the ac. power supplied.
  • control circuit means for supplying energy to said energy accumulation means in the event of conduction by said second electronic switch means during said half cycle of each cycle and preventing the flow of any substantial amount of energy through said second electronic switch means to said energy accumulation means during said alternate half cycle.
  • said ignition means comprises spark ignition means.
  • a system according to claim 6 comprising lock out means adapted to transmit power to said system during normal periodic energization of said second electronic switch means and to lock out said system following normal periodic energization of said first electronic switch for a predetermined period of time.
  • valve means comprises electromagnetic means for controlling the flow of fuel
  • said first electronic switch is connected to transmit electrical power to said electromagnet means for opening said valve means
  • said sec ond electronic switch means is connected to transmit electrical power to said electromagnetic means for maintaining said valve means in open position in response to signals from said flame detector means.
  • a system according to claim 1 comprising ignition timer means for timing the operation of said ignition means and including power input means for supplying power to said burner control system and further comprising switch deactivator means for disenabling said first electronic switch means in response to timing out of said ignition timer means in a predetermined period of time.
  • said switch deactivator means comprises energy accumulation means for normally receiving energy at a first rate through said first electronic switch means and comprising threshold means for disconnecting power from said control system after the accumulation of a predetermined amount of energy.
  • a system according to claim 1 comprising lock out means adapted to transmit power to said system during normal periodic energization of said second electronic switch means and to lock out said system following normal-periodic energization of said electronic switch for a predetermined period of time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
US00306591A 1972-11-15 1972-11-15 Burner control system Expired - Lifetime US3832123A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00306591A US3832123A (en) 1972-11-15 1972-11-15 Burner control system
AU62421/73A AU6242173A (en) 1972-11-15 1973-11-13 Burner control system
CA185,621A CA1005552A (en) 1972-11-15 1973-11-13 Burner control system
JP48128770A JPS4986923A (enrdf_load_stackoverflow) 1972-11-15 1973-11-15
FR7341521A FR2215131A5 (enrdf_load_stackoverflow) 1972-11-15 1973-11-15

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US00306591A US3832123A (en) 1972-11-15 1972-11-15 Burner control system

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US3832123A true US3832123A (en) 1974-08-27

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US00306591A Expired - Lifetime US3832123A (en) 1972-11-15 1972-11-15 Burner control system

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US (1) US3832123A (enrdf_load_stackoverflow)
JP (1) JPS4986923A (enrdf_load_stackoverflow)
AU (1) AU6242173A (enrdf_load_stackoverflow)
CA (1) CA1005552A (enrdf_load_stackoverflow)
FR (1) FR2215131A5 (enrdf_load_stackoverflow)

Cited By (17)

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US3970864A (en) * 1974-03-01 1976-07-20 Johnson Service Company Control arrangement fail-safe timing circuit
US3975136A (en) * 1975-07-08 1976-08-17 Emerson Electric Co. Burner control system
US4070144A (en) * 1976-01-30 1978-01-24 General Electric Company Control system
US4086048A (en) * 1974-10-07 1978-04-25 International Telephone And Telegraph Corporation Spark ignited recycling ignition system with interlocking gas valve control
US4116613A (en) * 1977-01-24 1978-09-26 Johnson Controls, Inc. Direct ignition system with interlock protection
US4128387A (en) * 1976-10-22 1978-12-05 Paul T. Mu Ignition device
US4235587A (en) * 1979-04-09 1980-11-25 Honeywell Inc. Flame responsive control circuit
US4854852A (en) * 1987-09-21 1989-08-08 Honeywell Inc. System for redundantly processing a flame amplifier output signal
US5655900A (en) * 1995-11-20 1997-08-12 Harper-Wyman Company Gas oven control system
US5957679A (en) * 1997-07-22 1999-09-28 Harper-Wyman Company Gas fireplace burner control system
US20050083735A1 (en) * 2003-10-20 2005-04-21 Jian Chen Behavior based programming of non-volatile memory
US6888390B2 (en) 2002-02-04 2005-05-03 R. W. Beckett Corporation Timer circuit for valve activation in oil burner system
US20050170302A1 (en) * 2004-01-30 2005-08-04 Inaki Ayastuy Gas burner control for a bake oven
US20060283440A1 (en) * 2005-06-16 2006-12-21 Arlo Lin Fuel-based heater
US20070099140A1 (en) * 2005-11-01 2007-05-03 Seven Universe Industrial Co., Ltd. Stove suitable for various kinds of gas pressure
US20150184866A1 (en) * 2012-08-28 2015-07-02 Electrolux Home Products Corporation N. V. Method of operating a gas burner of a cooking appliance
US20190086078A1 (en) * 2017-09-18 2019-03-21 Haier Us Appliance Solutions, Inc. Gas burner assembly for a cooktop appliance

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FR2414686A1 (fr) * 1978-01-11 1979-08-10 Cafap Sa Procede et dispositif de detection automatique d'une flamme

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US3649156A (en) * 1969-11-13 1972-03-14 Eaton Yale & Towne Fluid fuel burner control system
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Cited By (20)

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US3970864A (en) * 1974-03-01 1976-07-20 Johnson Service Company Control arrangement fail-safe timing circuit
US4086048A (en) * 1974-10-07 1978-04-25 International Telephone And Telegraph Corporation Spark ignited recycling ignition system with interlocking gas valve control
US3975136A (en) * 1975-07-08 1976-08-17 Emerson Electric Co. Burner control system
US4070144A (en) * 1976-01-30 1978-01-24 General Electric Company Control system
US4128387A (en) * 1976-10-22 1978-12-05 Paul T. Mu Ignition device
US4116613A (en) * 1977-01-24 1978-09-26 Johnson Controls, Inc. Direct ignition system with interlock protection
US4235587A (en) * 1979-04-09 1980-11-25 Honeywell Inc. Flame responsive control circuit
US4854852A (en) * 1987-09-21 1989-08-08 Honeywell Inc. System for redundantly processing a flame amplifier output signal
US5655900A (en) * 1995-11-20 1997-08-12 Harper-Wyman Company Gas oven control system
US5957679A (en) * 1997-07-22 1999-09-28 Harper-Wyman Company Gas fireplace burner control system
US6929465B1 (en) * 2002-02-04 2005-08-16 R. W. Beckett Corporation Timer circuit for valve activation in oil burner system
US6888390B2 (en) 2002-02-04 2005-05-03 R. W. Beckett Corporation Timer circuit for valve activation in oil burner system
US20050083735A1 (en) * 2003-10-20 2005-04-21 Jian Chen Behavior based programming of non-volatile memory
US20050170302A1 (en) * 2004-01-30 2005-08-04 Inaki Ayastuy Gas burner control for a bake oven
US7044729B2 (en) * 2004-01-30 2006-05-16 Fagor, S. Coop. Gas burner control for a bake oven
US20060283440A1 (en) * 2005-06-16 2006-12-21 Arlo Lin Fuel-based heater
US20070099140A1 (en) * 2005-11-01 2007-05-03 Seven Universe Industrial Co., Ltd. Stove suitable for various kinds of gas pressure
US20150184866A1 (en) * 2012-08-28 2015-07-02 Electrolux Home Products Corporation N. V. Method of operating a gas burner of a cooking appliance
US10739010B2 (en) * 2012-08-28 2020-08-11 Electrolux Home Products Corporation N.V. Method of operating a gas burner of a cooking appliance
US20190086078A1 (en) * 2017-09-18 2019-03-21 Haier Us Appliance Solutions, Inc. Gas burner assembly for a cooktop appliance

Also Published As

Publication number Publication date
FR2215131A5 (enrdf_load_stackoverflow) 1974-08-19
CA1005552A (en) 1977-02-15
AU6242173A (en) 1975-05-15
JPS4986923A (enrdf_load_stackoverflow) 1974-08-20

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