CN1215819A - Flame bar circuit - Google Patents
Flame bar circuit Download PDFInfo
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- CN1215819A CN1215819A CN 98123607 CN98123607A CN1215819A CN 1215819 A CN1215819 A CN 1215819A CN 98123607 CN98123607 CN 98123607 CN 98123607 A CN98123607 A CN 98123607A CN 1215819 A CN1215819 A CN 1215819A
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Abstract
The object of the invention is to improve measurement accuracy by a simple circuit configuration. When a sinusoidal wave voltage with a size that is proportional to a battery voltage is generated at a secondary side coil T2, a flame current that is subjected to half-wave rectification in a direction marked by an arrow through a secondary side coil T2, a resistor R2, flame, and a resistor R3 flows while flame is formed at a burner B, and a potential at a point E is reduced by the amount of voltage drop due to the resistor R3 for the electrode potential of a dry cell V. Then, the resistance of the resistor R3 is set so that the potential does not become lower than the negative potential of the dry cell V. The potential is inputted to the non-inverted input side of a comparator CP. Then, since a voltage applied to an inverted input side does not exceed a reference potential for judgment, the output of the comparator CP becomes Lo.
Description
The present invention relates to use flame rod (flame rod) to detect the flame-rod circuit that has or not of flame.
Up to now, for example in gas combustion apparatus, as the flame detecting element that has or not of the flame that detects burner, known have a flame rod.
Fig. 3 is the circuit diagram that utilizes the existing flame-rod circuit that dry cell drives.This flame-rod circuit is made of the oscillation boosting portion of the primary side of the transformer T of the usefulness of boosting and the flame test section of primary side.
In the oscillation boosting portion, constitute oscillating circuit, in addition, possess as the dry cell V of power supply and be used to eliminate the pulsation of power supply and the capacitor C2 of the influence of impedance by primary side coil T1, resistance R 7, diode D2 and the transistor Tr 3 of the transformer T of the usefulness of boosting.The base stage of transistor Tr 3 is connected to the end of primary side coil T1 by resistance R 7, and colelctor electrode is connected to the other end of primary side coil T1, grounded emitter.In addition, will supply with the leading point of primary side coil T1 from the electric power of dry cell V.
The flame test section is made of secondary side coil T2, flame rod FR, resistance R 8, R9, R10, capacitor C6, C7, Zener diode ZD and the FET of the transformer T of the usefulness of boosting.Flame rod FR is connected to the end of secondary side coil T2 by resistance R 8, is arranged to make the flame formation portion of its front end face to the burner B of the earthing of casing.On the other hand, with the anode coat ground connection of dry cell V, the other end of secondary side coil T2 carries out electric conductivity by resistance R 9 with burner B and is connected, and forms the flowloop of flame current, is connected to the grid of FET in addition by resistance R 10.And, the output of flame detection signal is arranged in the drain electrode of FET its source ground.
From dry cell V supply capability the time, utilize above-mentioned structure, at first, by flowing through base current via primary side coil T1 and resistance R 7, transistor Tr 3 conductings, by flowing through collector current, producing its direction in primary side coil T1 is the induced potential that base current is increased.Then, if collector current increases gradually and the electric current that reaches capacity, the then direction of induced potential counter-rotating reduces base current, and transistor Tr 3 is ended.If there be not the influence of induced potential, then in transistor Tr 3 once more flow through base current thereafter.By carrying out such operation repeatedly, make transistor Tr 3 periodically repeat conduction and cut-off, in secondary side coil T2, produce periodic voltage.Therefore, formed in burner B that the rectified action owing to flame becomes the circuit that is equal to be connected in series diode and resistance under the state of flame, on with the direction shown in the arrow, flow through the flame current that passes through halfwave rectifier by secondary side coil T2, resistance R 8, flame and resistance R 9, because the voltage drop on resistance R 9 produces on an A with respect to the current potential of shell ground for bearing.Make the voltage smoothing of resistance R 9 by capacitor C6, remove noise contribution by the filter circuit of resistance R 10 and capacitor C7 again, be added between the grid source of FET.FET is in conducting state usually, if but grid are lower than predetermined threshold value to the potential difference in source, and then FET ends.For example, be under the situation of 0.5V in threshold value, grid to the potential difference in source between 0-0.5V, the FET conducting, if be lower than-0.5V, then FET ends.Thereby, in burner B, having formed under the state of flame, FET ends, and the output of flame detection signal becomes Open (open circuit).On the other hand, if do not form flame, then do not have potential difference between the grid source, the FET conducting is from output output Lo (low) signal of flame detection signal.Thereby the energy basis detects having or not of flame immediately from the signal of the output of flame detection signal.
Like this, FET is ended, can detect having or not of flame by utilizing the voltage drop on resistance R 9 that causes of flowing because of flame current.But, because the dispersion of the threshold value of each FET is bigger, so there is the problem of the deterioration in accuracy of decision level.If the use comparison circuit, then can reduce decision level error, but because the current potential that produces at some A place is lower than the negative pole current potential of battery, so in order to import this current potential, need add negative supply, the circuit complexity that just becomes like this to be used for the driving of comparison circuit.
In addition, because the voltage that produces in secondary side coil T2 and the change of dry cell voltage change pro rata, even the equal state of flame resistance, if the dry cell variation in voltage, the current potential of then putting A also changes.That is, aspect accuracy of detection, be unfavorable, even identical fired state also detects different fired states.If use voltage-stabilized power supply circuit to obtain constant voltage, though then can eliminate the influence that the change because of dry cell voltage causes, cost increases substantially.
The purpose of flame-rod circuit of the present invention is to solve above-mentioned problem, utilizes simple circuit configuration to improve the judgement precision.
The described flame-rod circuit in the 1st aspect of the present invention that solves above-mentioned problem possesses:
Cell voltage is boosted and produce the transformer of vibration;
Carry out the detection resistance that electric conductivity is connected with an end of the secondary side coil of above-mentioned transformer;
Make fuel gas formation combustion flame and carry out the burner that electric conductivity is connected with its shell of resistance with above-mentioned secondary side coil by above-mentioned detection; And
Carry out the flame rod that electric conductivity is connected, makes its front end face to be provided with to above-mentioned combustion flame with the other end of above-mentioned secondary side coil,
Described flame-rod circuit produces voltage in above-mentioned secondary side coil, judge having or not of flame by detecting the electric current that flows through above-mentioned combustion flame according to above-mentioned detection with ohmically voltage drop, and the main points of described flame-rod circuit are:
Possesses the comparison circuit that utilizes above-mentioned battery supply to carry out work, make the positive pole of the power supply of this comparison circuit carry out electric conductivity and be connected, judge having or not of flame according to the output of the comparison circuit that the current potential after this power source voltage dividing potential drop and above-mentioned detection are compared with a terminal potential of becoming of the resistance current potential lower than the current potential of said burner shell with the said burner shell.
The described flame-rod circuit in the 2nd aspect of the present invention that solves above-mentioned problem possesses:
Cell voltage is boosted and produce the transformer of vibration;
Carry out the detection resistance that electric conductivity is connected with an end of the secondary side coil of above-mentioned transformer;
Make fuel gas formation combustion flame and carry out the burner that electric conductivity is connected with its shell of resistance with above-mentioned secondary side coil by above-mentioned detection; And
Carry out the flame rod that electric conductivity is connected, makes its front end face to be provided with to above-mentioned combustion flame with the other end of above-mentioned secondary side coil,
Described flame-rod circuit produces voltage in above-mentioned secondary side coil, judge having or not of flame by detecting the electric current that flows through above-mentioned combustion flame according to above-mentioned detection with ohmically voltage drop, and the main points of described flame-rod circuit are:
Possesses the comparison circuit that utilizes above-mentioned battery supply to carry out work, make negative pole and the above-mentioned detection of the power supply of this comparison circuit carry out electric conductivity with an end of becoming of the resistance current potential lower than the current potential of said burner shell and be connected, having or not of flame judged in the output of the comparison circuit that compares according to the current potential with current potential after this power source voltage dividing potential drop and said burner shell.
The main points that solve the described flame-rod circuit in the 3rd aspect of the present invention of above-mentioned problem are: aspect the of the present invention the 1st or in the described flame-rod circuit in the 2nd aspect, directly use the working power of above-mentioned battery supply as above-mentioned comparison circuit, be created on the voltage that produces in the above-mentioned secondary side coil, the voltage of itself and this battery is changed pro rata.
The described flame-rod circuit in the 1st aspect of the present invention with said structure, produce voltage cell voltage being boosted and produce in the secondary side coil of transformer of vibration, by according to detecting the electric current that flows through the combustion flame that forms in the burner with ohmically voltage drop and judge having or not of flame detecting.In addition, by the comparison circuit that carries out work with battery supply, to a current potential after this power source voltage dividing potential drop and a terminal potential that detects with becoming of the resistance current potential lower than the current potential of burner housing are compared.Since with the positive pole of the power supply of comparison circuit and burner housing electric conductivity couple together, so the one terminal potential is lower than the positive electrode potential of this power supply, moreover make its negative pole current potential that is not less than this power supply by detecting to set for the resistance value of resistance, can make in the scope of its positive electrode potential that is in this power supply and negative pole current potential.Thereby, there is no need to reset the power supply that comparison circuit is used.
The described flame-rod circuit in the 2nd aspect of the present invention with said structure, produce voltage cell voltage being boosted and produce in the secondary side coil of transformer of vibration, by according to detecting the electric current that flows through the combustion flame that forms in the burner with ohmically voltage drop and judge having or not of flame detecting.In addition, by the comparison circuit that carries out work with battery supply, to the current potential after this power source voltage dividing potential drop and the current potential of burner housing are compared.Since with the negative pole of the power supply of comparison circuit with detect a end with becoming of the resistance current potential lower and carry out electric conductivity and be connected than the current potential of burner housing, so the current potential of burner housing is than the negative pole current potential height of this power supply, moreover make its positive electrode potential that is not higher than this power supply by detecting to set for the resistance value of resistance, can make in the scope of its positive electrode potential that is in this power supply and negative pole current potential.Thereby, there is no need newly to be provided with the power supply that comparison circuit is used.
Moreover, have the described flame-rod circuit in the 3rd aspect of the present invention of said structure, directly use the battery supply working power of circuit as a comparison, be created on the voltage that produces in the secondary side coil, the voltage of itself and this battery is changed pro rata.Therefore, even the resistance of flame is constant, flame current also changes along with the change of cell voltage, but because the current potential that compares all changes pro rata with cell voltage, so even the cell voltage change, to result of determination also not influence.
Fig. 1 is the circuit diagram as the flame-rod circuit of one embodiment of the present of invention.
Fig. 2 is the circuit diagram as another routine flame-rod circuit.
Fig. 3 is the circuit diagram as the flame-rod circuit of conventional example.
For the structure function of the present invention that has illustrated more than further understanding, the below preferred embodiment of explanation flame-rod circuit of the present invention.
Fig. 1 is the circuit diagram as the flame-rod circuit of one embodiment of the present of invention.This flame-rod circuit is used for gas water heater or gas burner etc. with the burner of dry cell as power supply, is made of the oscillation boosting portion of the primary side of the transformer T of the usefulness of boosting and the flame test section of primary side.
In the oscillation boosting portion, primary side coil T1, capacitor C1, resistance R 1 and transistor Tr 1, Tr2 by the transformer T of the usefulness of boosting constitute oscillating circuit, in addition, possess as the dry cell V of power supply and be used to eliminate the pulsation of power supply and the capacitor C2 of the influence of impedance.And, will pass through the mid point that choke coil L supplies with primary side coil T1 from the electric power of dry cell V, in addition, from the base stage of choke coil L by resistance R 1 supply transistor Tr 1, in addition, from the base stage of resistance R 1 by base drive coil T3 supply transistor Tr 2.Transistor Tr 1, Tr2 that operating characteristic is identical become the symmetric shape that separately colelctor electrode is connected to the two ends of primary side coil T1, emitter stage common ground separately.
In addition, capacitor C1 is the resonance capacitor of vibration.Be used to make vibration to become stable.
The flame test section is made of secondary side coil T2, flame rod FR, resistance R 2, R3, R4, R5, R6, capacitor C3, C4, C5, diode D1 and the comparator C P of the transformer T of the usefulness of boosting.Flame rod FR is connected to the end of secondary side coil T2 by resistance R 2, is arranged to make the flame formation portion of its front end face to the burner B of the earthing of casing.On the other hand, with the anodal earthing of casing of dry cell V, the other end of secondary side coil T2 carries out electric conductivity by resistance R 3 with burner B and is connected, and forms the flowloop of flame current, in addition, is connected to the non-counter-rotating input side of comparator C P by resistance R 4.And will be with resistance R5, the R6 potential value after to the cell voltage dividing potential drop as judging the counter-rotating input side that is input to comparator C P with reference potential.
From dry cell V when the choke coil L supply capability, utilize above-mentioned structure, because transistorized h
FEThe dispersion of (DC current multiplication factor) and primary side coil T1 etc., some at first conductings of transistor Tr 1, Tr2.Then, if the transistorized collector current of conducting increases and the electric current that reaches capacity gradually, then end, flow through base current and conducting in another transistor simultaneously owing to this transistorized base current of the induced potential that produces among the base drive coil T3 reduces.Then, the electric current if this transistorized collector current reaches capacity then ends owing to this transistorized base current of the induced potential that produces among the base drive coil T3 reduces, and flows through base current and conducting in another transistor simultaneously.Because electric current flows to transistor Tr 1, the Tr2 by choke coil L from power supply, so the rising of transistor Tr 1, Tr2 mobile electric current when conducting becomes gently, prevent flowing of superfluous electric current, reduce the power consumption that causes because of heating.Moreover, alternately repeat conduction and cut-off by transistor Tr 1, Tr2, in primary side coil T1, alternately produce the magnetic field intensity of both forward and reverse directions, in secondary side coil T2, produce sine voltage with the proportional size of cell voltage.Therefore, formed in burner B that the rectified action owing to flame becomes the circuit that is equal to be connected in series diode and resistance under the state of flame, flow through flame current on the direction shown in the arrow by secondary side coil T2, resistance R 2, flame and resistance R 3 through halfwave rectifier, the current potential of some E with respect to the positive electrode potential of dry cell V low the part of the voltage drop on the resistance R 3.And, the resistance value of resistance R 3 set for make this current potential be not less than the negative pole current potential of dry cell V.In addition, 3 pairs of these current potentials of electricity consumption container C carry out smoothing, and are input to the non-counter-rotating input side of comparator C P.And, owing to be lower than the judgement reference potential that is input to the counter-rotating input side, so the output of comparator C P becomes Lo.On the other hand, if do not form flame, the current potential of then putting E equals the positive electrode potential of dry cell V, surpasses judgement and uses reference potential, and the output of comparator C P becomes Open.
If cell voltage change, then the voltage that produces in secondary side coil T2 also changes pro rata with it, even flame resistance is identical value, flame current is change also, the current potential change of point E, but the current potential of some E is a part of having deducted the voltage drop of the resistance R 3 that produces because of flame current from the positive electrode potential of dry cell V, and the change with cell voltage changes pro rata respectively.On the other hand, owing to judge with reference potential it also is the partial pressure value of cell voltage, change pro rata with the change of cell voltage, thus eliminated that change because of cell voltage produces to the judgement Effect on Performance.
As discussed above, flame-rod circuit according to present embodiment, the anodal earthing of casing with dry cell V, utilization is read from positive electrode potential and has been deducted structure owing to the current potential of the part that flows through the voltage drop that flame current produces resistance R 3, newly additional negative supply just can detect part because of the voltage drop of flame current generation by comparator C P with simple structure, so can reduce the error of decision level.In addition, because the variation in voltage of dry cell V does not influence the judgement that flame detects,, can improve security so can improve the judgement precision.Moreover also can be used for based on flame current is the judgement of imperfect combustion etc. of the size of flame resistance.
In addition, utilize the structure that electric current is flow through by choke coil L in oscillation boosting portion, the rising of transistor Tr 1, the electric current of Tr2 when conducting becomes gently, can prevent flowing of superfluous electric current, and the power consumption that heating is caused becomes minimum.Thereby, even often come flame detection, also can prolong the life-span of dry cell V fully by flame rod FR.Moreover, owing to, can reduce the capacitance of needed capacitor C3 in smoothing, can improve response for igniting and fire extinguishing by improving dutycycle through the signal of halfwave rectifier.In addition, on positive negative direction, vibrate, can improve delivery efficiency towards secondary side coil T2 by the voltage that makes primary side coil T1.
In addition, in the present embodiment, by with the anodal earthing of casing of dry cell V and detect the current potential of the part of having deducted the voltage drop that causes because of resistance R 3, make and detect in the scope that current potential is in the positive electrode potential of dry cell V and negative pole current potential, but also can form different therewith structures.Fig. 2 is the circuit diagram as another routine flame-rod circuit.This flame-rod circuit is identical with the basic structure of the above embodiments, but the circuit structure of flame test section has some differences.Therefore, attached about the part that repeats with identical symbol, omit its explanation.
In this circuit, connect shell ground in the negative pole of battery V by resistance R 11, the other end that the flame rod FR of secondary side coil T2 connects side carries out electric conductivity by resistance R 11 with burner B and is connected the flowloop of formation flame current.And the counter-rotating of comparator C P input side joint shell ground will be input to the non-counter-rotating input side of comparator C P with resistance R5, the R6 value after to the cell voltage dividing potential drop with reference potential as judgement.
From dry cell V when the choke coil L supply capability, utilize above-mentioned structure, in secondary side coil T2, produce sine voltage with the proportional size of cell voltage.Therefore, formed in burner B that the rectified action owing to flame becomes the circuit that is equal to be connected in series diode and resistance under the state of flame, flow through the flame current that passes through halfwave rectifier by secondary side coil T2, resistance R 2, flame and resistance R 11 on the direction shown in the arrow, the current potential of some F exceeds the part of the voltage drop on the resistance R 11 with respect to the negative pole current potential of dry cell V.And, the resistance value of resistance R 11 is set for the positive electrode potential that makes this current potential not be higher than dry cell V.In addition, 8 pairs of these current potentials of electricity consumption container C carry out smoothing, and are input to the counter-rotating input side of comparator C P.And owing to be higher than the judgement reference potential that is input to non-counter-rotating input side, the output of comparator C P becomes Lo.On the other hand, if do not form flame, the current potential of then putting F equals the negative pole current potential of dry cell V, is lower than judgement and uses reference potential, and the output of comparator C P becomes Open.
Embodiments of the invention more than have been described, but the present invention is not limited to such embodiment, in the scope that does not break away from main points of the present invention, can implements with various forms certainly.
As above described in detail, according to the described flame-rod circuit in the 1st aspect of the present invention and the 2nd aspect, owing to do not need newly to be provided with the power supply that comparison circuit is used, so can utilize simple circuit configuration to reduce the error of decision level.
Moreover, according to the described flame-rod circuit in the 3rd aspect of the present invention,,, improved security so improved the accuracy of detection of fired state owing to can utilize simple circuit configuration to eliminate the influence that the change because of cell voltage causes for result of determination.
Claims (3)
1. flame-rod circuit, described flame-rod circuit possesses:
Cell voltage is boosted and produce the transformer of vibration;
Carry out the detection resistance that electric conductivity is connected with an end of the secondary side coil of described transformer;
Make fuel gas formation combustion flame and carry out the burner that electric conductivity is connected with its shell of resistance with described secondary side coil by described detection; And
Carry out the flame rod that electric conductivity is connected, makes its front end face to be provided with to described combustion flame with the other end of described secondary side coil,
Described flame-rod circuit produces voltage in described secondary side coil, judge having or not of flame by detecting the electric current that flows through described combustion flame according to described detection with ohmically voltage drop, and described flame-rod circuit is characterised in that:
Possesses the comparison circuit that utilizes described battery supply to carry out work, make the positive pole of the power supply of this comparison circuit carry out electric conductivity and be connected, judge having or not of flame according to the output of the comparison circuit that the current potential after this power source voltage dividing potential drop and described detection are compared with a terminal potential of becoming of the resistance current potential lower than the current potential of described burner housing with described burner housing.
2. flame-rod circuit, described flame-rod circuit possesses:
Cell voltage is boosted and produce the transformer of vibration;
Carry out the detection resistance that electric conductivity is connected with an end of the secondary side coil of described transformer;
Make fuel gas formation combustion flame and carry out the burner that electric conductivity is connected with its shell of resistance with described secondary side coil by described detection; And
Carry out the flame rod that electric conductivity is connected, makes its front end face to be provided with to described combustion flame with the other end of described secondary side coil,
Described flame-rod circuit produces voltage in described secondary side coil, judge having or not of flame by detecting the electric current that flows through described combustion flame according to described detection with ohmically voltage drop, and described flame-rod circuit is characterised in that:
Possesses the comparison circuit that utilizes described battery supply to carry out work, make negative pole and the described detection of the power supply of this comparison circuit carry out electric conductivity with an end of becoming of the resistance current potential lower than the current potential of described burner housing and be connected, having or not of flame judged in the output of the comparison circuit that compares according to the current potential with current potential after this power source voltage dividing potential drop and described burner housing.
3. the flame-rod circuit described in claim 1 or 2 is characterized in that:
Directly use the working power of described battery supply, be created on the voltage that produces in the described secondary side coil, the voltage of itself and this battery is changed pro rata as described comparison circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP311268/97 | 1997-10-27 | ||
| JP31126897A JP3862834B2 (en) | 1997-10-27 | 1997-10-27 | Frame rod circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1215819A true CN1215819A (en) | 1999-05-05 |
Family
ID=18015099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98123607 Pending CN1215819A (en) | 1997-10-27 | 1998-10-27 | Flame bar circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3862834B2 (en) |
| CN (1) | CN1215819A (en) |
-
1997
- 1997-10-27 JP JP31126897A patent/JP3862834B2/en not_active Expired - Lifetime
-
1998
- 1998-10-27 CN CN 98123607 patent/CN1215819A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP3862834B2 (en) | 2006-12-27 |
| JPH11132453A (en) | 1999-05-21 |
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