CN115031836A - Ignition fire detection circuit and ignition fire detection system - Google Patents
Ignition fire detection circuit and ignition fire detection system Download PDFInfo
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- CN115031836A CN115031836A CN202210725352.8A CN202210725352A CN115031836A CN 115031836 A CN115031836 A CN 115031836A CN 202210725352 A CN202210725352 A CN 202210725352A CN 115031836 A CN115031836 A CN 115031836A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/104—Inspection; Diagnosis; Trial operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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Abstract
The application provides an ignition and fire detection circuit and an ignition and fire detection system, wherein in the ignition and fire detection circuit, a first switch device is closed when the current direction of an alternating current power supply is a first direction, and is opened when the current direction is a second direction; the igniter is electrically connected with the first switching device and the alternating current power supply, the igniter stores charges under the condition that the first switching device is closed, the stored charges are discharged when being larger than a preset value, the fire outlet is ignited, and the flame conducting direction is the same as the second direction; the first end of the first voltage divider is connected with the first end of the fire outlet, the second end of the first voltage divider is electrically connected with the first end of the alternating current power supply, the second end of the fire outlet is connected with the second end of the alternating current power supply, or the second end of the first voltage divider is electrically connected with the second end of the alternating current power supply, and the second end of the fire outlet is connected with the first end of the alternating current power supply; the voltage testing device is used for detecting and outputting a voltage value at two ends of the first voltage divider. The application avoids the interference of simultaneous ignition and ignition.
Description
Technical Field
The application relates to the technical field of ignition and fire detection, in particular to an ignition and fire detection circuit, an ignition and fire detection system and a gas water heater.
Background
The existing ignition and fire detection method simultaneously detects whether ignition is successful or not and whether flame exists or not, and the method has large interference on a circuit. Because the capacitor in the igniter discharges instantaneously at the ignition moment, the external radiation interference is large, if the external radiation interference is serious, the external radiation interference can generate interference on the self circuit and surrounding electric appliances, and the mutual interference of ignition and ignition detection is caused.
Moreover, the above ignition fire detection method cannot continuously monitor the flame all the time, and most of the methods detect the flame burning and send the flame burning to the main chip with a high/low level, but the high/low level may be interfered by the capacitance discharge at the moment of ignition, and cannot detect the flame burning all the time.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The main aim at of this application provides an ignition is examined thermal circuit, is igniteed and is examined fire system and gas heater to the problem of carrying out mutual interference simultaneously of examining the fire in solving prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided an ignition and fire detection circuit including a first switching device, an igniter, a first voltage dividing device, and a voltage testing device, wherein a first terminal of the first switching device is configured to be electrically connected to a first terminal of an ac power source, the first switching device is configured to be closed when a current direction of the ac power source is a first direction, and configured to be opened when the current direction of the ac power source is a second direction, the first direction being opposite to the second direction; the first end of the igniter is electrically connected with the second end of the first switching device, the second end of the igniter is used for being electrically connected with the second end of the alternating current power supply, the igniter is used for storing electric charges when the first switching device is closed and discharging electricity to ignite a fire outlet when the stored electric charges are larger than a preset value, and the flame conducting direction of the fire outlet is the same as the second direction; the first end of the first voltage divider is used for being connected with the first end of the fire outlet, the second end of the first voltage divider is used for being electrically connected with the first end of the alternating current power supply, and the second end of the fire outlet is connected with the second end of the alternating current power supply, or the second end of the first voltage divider is used for being electrically connected with the second end of the alternating current power supply, and the second end of the fire outlet is connected with the first end of the alternating current power supply; the voltage testing device is used for detecting and outputting voltage values at two ends of the first voltage divider.
Optionally, the ignition detecting circuit further includes a second switch device, through which the second end of the igniter is electrically connected to the second end of the ac power supply, and the second switch device is configured to be closed when the current direction of the ac power supply is the first direction and configured to be opened when the current direction of the ac power supply is the second direction.
Optionally, the first switching device and the second switching device are both unidirectional devices, the first switching device includes a first diode, the second switching device includes a second diode, and the first direction is a direction in which anodes of the first diode and the second diode point to cathodes.
Optionally, the ignition fire detecting circuit further includes a first filter device, a first end of the first filter device is electrically connected to the second end of the ac power supply, and a second end of the first filter is electrically connected to the second end of the fire outlet.
Optionally, the ignition and fire detection circuit further includes a second voltage divider, and the second end of the first filter is electrically connected to the second end of the fire outlet through the second voltage divider.
Optionally, the first filter device comprises at least one first safety capacitor.
Optionally, the ignition and fire detection circuit further includes a second filter device, and the second end of the first voltage divider is electrically connected to the first end of the ac power supply through the second filter device.
Optionally, the second filter device comprises at least one second safety capacitor.
Optionally, the first voltage divider means comprises a capacitor and/or a resistor.
According to another aspect of the present application, an ignition fire detection system is provided, which includes any one of the ignition fire detection circuit, a fire outlet, and a processor, wherein the processor is configured to receive a voltage value output by a voltage test device, determine whether the fire outlet has a flame and/or a flame condition according to the voltage value, and determine whether the fire outlet has a flame and/or a flame state.
Optionally, the processor is configured to determine that the flame exists at the fire outlet if the voltage value is greater than a preset voltage.
According to the application, the ignition fire detection system is also provided.
By applying the technical scheme, in the ignition and fire detection circuit, a first switch device and an igniter are connected in series to form an ignition branch circuit, a first voltage divider device is connected in series with a fire outlet to form a fire detection branch circuit, the ignition branch circuit is connected in parallel with the fire detection branch circuit and then electrically connected with an alternating current power supply, when the fire outlet has no flame, the fire detection branch circuit is not conducted, two ends of the first voltage divider device have no voltage difference, when the alternating current power supply provides current in a first direction, the first switch device is closed, the ignition branch circuit is conducted, the igniter starts to store electric charge, when the stored electric charge is enough, the fire outlet is ignited by discharging, so that the fire outlet has flame in a second direction, when the alternating current power supply provides current in the second direction and the fire outlet has flame, the fire detection branch circuit is conducted, the two ends of the first voltage divider have voltage difference, and voltage values at two ends of the first voltage divider are detected by a voltage test device, the function of fire detection can be realized. Compare and examine the problem that the fire carried out mutual interference simultaneously among prior art, this application is through setting up parallelly connected, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the ignition branch road and examine the crisscross of fire branch road and switch on, and then realize the crisscross of igniteing and examining the fire and go on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining fire and going on simultaneously with the fire, it is higher to have guaranteed the accuracy that detects, the abnormal scheduling problem of damaging even of components and parts function of having avoided disturbing the cause has simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a schematic diagram of an ignition and fire detection system according to an embodiment of the present application.
Wherein the figures include the following reference numerals:
100. a first switching device; 200. an igniter; 300. a first voltage dividing device; 400. a fire outlet; 401. a third diode; 402. a fourth resistor; 500. a second switching device; 600. a first filter device; 601. a first safety capacitor; 700. a second voltage dividing device; 701. a first resistor; 702. a second resistor; 800. a second filter device; 801. and a second safety capacitor.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, in the prior art, mutual interference is performed during ignition and fire detection, and in order to solve the above problems, the present application provides an ignition and fire detection circuit, an ignition and fire detection system, and a gas water heater.
According to an exemplary embodiment of the present application, there is provided an ignition and fire detection circuit, as shown in fig. 1, the ignition and fire detection circuit includes a first switching device 100, an igniter 200, a first voltage dividing device 300, and a voltage testing device (not shown in the drawings), wherein a first end of the first switching device 100 is configured to be electrically connected to a first end of an ac power source, the first switching device 100 is configured to be closed when a current direction of the ac power source is a first direction, and is configured to be opened when the current direction of the ac power source is a second direction, the first direction being opposite to the second direction; a first end of the igniter 200 is electrically connected to a second end of the first switching device 100, a second end of the igniter 200 is electrically connected to a second end of the ac power source, the igniter 200 is configured to store electric charges when the first switching device 100 is closed, and to discharge electricity to ignite the fire hole 400 when the stored electric charges are greater than a predetermined value, and a flame conduction direction of the fire hole 400 is the same as the second direction; the first end of the first voltage divider member 300 is adapted to be connected to the first end of the fire outlet 400, the second end of the first voltage divider 300 is electrically connected to the first end of the ac power source, the second end of the fire outlet 400 is connected to the second end of the ac power source, or the second end of the first voltage divider 300 is electrically connected to the second end of the ac power source, the second end of the fire outlet 400 is connected to the first end of the ac power source, in the case where the first terminal of the first voltage dividing device 300 is the left terminal of the first voltage dividing device 300, that is, as shown in fig. 1, the left end of the first voltage divider member 300 is used to electrically connect to the fire outlet 400, the right end of the first voltage divider 300 is electrically connected to the first end of the ac power source, and the second end of the fire outlet 400 is electrically connected to the second end of the ac power source; in the case where the first end of the first voltage divider 300 is the right end of the first voltage divider 300, not shown, the right end of the first voltage divider 300 is electrically connected to the fire outlet 400, the left end of the first voltage divider 300 is electrically connected to the second end of the ac power source, and the second end of the fire outlet 400 is electrically connected to the first end of the ac power source, that is, the first voltage divider may be disposed at any side of the fire outlet; the voltage testing device is used for detecting and outputting voltage values at two ends of the first voltage divider.
In the ignition and fire detection circuit, the first switch device and the igniter are connected in series to form an ignition branch circuit, the first voltage divider device is connected in series with the fire outlet to form a fire detection branch circuit, the ignition branch circuit is electrically connected with the alternating current power supply after being connected in parallel with the fire detection branch circuit, when the fire outlet has no flame, the fire detection branch is not conducted, the two ends of the first voltage divider are not provided with voltage difference, when the alternating current power supply provides current in the first direction, the first switch device is closed, the ignition branch is conducted, the igniter begins to store electric charge, when the stored charges are enough, the fire hole is ignited by discharging, so that the flame with the second direction of conduction is arranged at the fire hole, when the alternating current power supply provides current in a second direction and flame exists at the fire outlet, the fire detection branch is conducted, the pressure difference appears at the two ends of the first voltage divider, the voltage value at two ends of the first voltage divider is detected by the voltage testing device, so that the fire detection function can be realized. Compare and examine the problem that the fire carried out mutual interference simultaneously among prior art, this application is through setting up parallelly connected, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the ignition branch road and examine the crisscross of fire branch road and switch on, and then realize the crisscross of igniteing and examining the fire and go on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining fire and going on simultaneously with the fire, it is higher to have guaranteed the accuracy that detects, the abnormal scheduling problem of damaging even of components and parts function of having avoided disturbing the cause has simultaneously.
And compare in the problem that can't monitor flame in succession among the prior art, the aforesaid of this application is lighted and is examined thermal circuit can detect flame in succession through above-mentioned first voltage divider spare and above-mentioned voltage test device, can examine fire inspection more safely.
Specifically, the igniter may be an ignition needle.
In order to further ensure high accuracy of ignition detection, according to a specific embodiment of the present application, as shown in fig. 1, the ignition detection circuit further includes a second switching device 500, a second terminal of the igniter 200 is electrically connected to a second terminal of the ac power source through the second switching device 500, and the second switching device 500 is configured to be closed when a current direction of the ac power source is the first direction and to be opened when the current direction of the ac power source is the second direction. Through above-mentioned second switching device, further realized the ignition branch road in examining the turn-on of fire branch road in turn, further avoided the ignition to go on in examining the fire simultaneously, the problem that the instantaneous discharge of ignition causes the interference to examining fire and other components and parts, further avoided the loss ability problem of great and components and parts of detection error, and, through setting up first switching device and second switching device, further guaranteed that the ignition branch road only switches on when the current direction of above-mentioned alternating current power supply is first direction, further guaranteed to switch on the reliability.
In another specific embodiment, as shown in fig. 1, the first switching device 100 and the second switching device 500 are both unidirectional devices, the first switching device 100 includes a first diode, the second switching device 500 includes a second diode, and the first direction is a direction in which anodes of the first diode and the second diode point to cathodes. Of course, the type selection of the first switching device and the second switching device is not limited to the diode, and may be any feasible switching device in the prior art.
According to a more specific embodiment of the present application, as shown in fig. 1, the first switching device is a first diode, and the second switching device is a second diode.
The skilled person can flexibly set the first switching device and the second switching device, such as only the first switching device, only the second switching device, or both the first switching device and the second switching device.
In order to further guarantee that the anti-interference performance of the ignition fire detection circuit is better, further guarantee that the detection accuracy of the ignition fire detection is higher, according to a further specific embodiment of the present application, as shown in fig. 1, the ignition fire detection circuit further comprises a first filter device 600, a first end of the first filter device 600 is used for being electrically connected with a second end of the ac power supply, and a second end of the first filter device 600 is used for being electrically connected with a second end of the fire outlet 400. The power supply signal on the fire detection branch is subjected to clutter filtering through the first filter device, and the influence of the clutter on the detection result is further avoided.
In another specific embodiment, the ignition and fire-checking circuit further includes a second voltage divider 700, and a second end of the first filter 600 is electrically connected to a second end of the fire outlet 400 through the second voltage divider 700. Of course, the second voltage divider may be replaced by a current limiter.
Specifically, the second voltage divider may include a resistor, a capacitor, an inductor, and the like. In one specific embodiment, as shown in fig. 1, the second voltage divider 700 is shown to include a first resistor 701 and a second resistor 702.
In an actual application process, a person skilled in the art may flexibly select any suitable filter device in the prior art as the combined circuit structure of the first filter, such as a capacitor, an inductor, a resistor, and the like, according to actual situations. Specifically, as shown in fig. 1, the first filter device 600 includes two first safety capacitors 601 connected in series.
According to another specific embodiment of the present application, as shown in fig. 1, the ignition and fire detection circuit further includes a second filter device 800, and a second end of the first voltage divider device 300 is electrically connected to the first end of the ac power source through the second filter device 800. The current output by the alternating current power supply is filtered through the second filter, so that the anti-interference performance of the ignition fire detection circuit is better, and the detection accuracy of ignition fire detection is higher.
Specifically, the second filter device includes at least one second safety capacitor. More specifically, as shown in fig. 1, the second filter device 800 includes two second safety capacitors 801 connected in series. The first voltage divider element may comprise a capacitor and/or a resistor.
More specifically, the first voltage divider is a third resistor. Of course, the second filter device and the first voltage divider device may be any suitable devices having a filtering function and a voltage dividing function in the prior art, and those skilled in the art may set the devices according to actual requirements.
Specifically, as shown in fig. 1, the ac power source is a commercial power source, the first switching device 100 is a first diode, an anode of the first diode is electrically connected to the second terminal of the first voltage divider 300 and the second safety capacitor 801, a cathode of the first diode is electrically connected to the first terminal of the igniter 200, the second switching device 500 is a second diode, an anode of the second diode is electrically connected to the second terminal of the igniter 200, the cathode of the second diode is electrically connected to the second voltage divider 700 and the first safety capacitor 601, respectively, so that when there is a flame at the fire outlet, due to the unidirectional conductive nature of the flame, the fire outlet is equivalent to a third diode 401 and a fourth resistor 402, an anode of the third diode 401 is electrically connected to the second resistor 702, and a cathode of the third diode 401 is electrically connected to the fourth resistor.
When the whole power-on machine is started, when the alternating current is in a negative half cycle (namely, in the first direction), the fire detection branch is disconnected, the voltage at two ends of the first voltage divider 300 is 0, the current flows to the live wire L from the zero line N sequentially through the two second safety regulation capacitors 801 connected in series, the first switch device 100, the igniter 200, the second switch device 500 and the two first safety regulation capacitors 601 connected in series, the ignition branch is a passage, the capacitors in the igniters accumulate charges, and when the accumulated charges reach the breakdown voltage of the breakdown devices in the igniters, the tips of the igniters discharge to ignite the fire outlets.
The ignition branch is disconnected in the positive half cycle of the alternating current (i.e. the second direction), and the flame exists, the current flows from the live wire L to the zero line N sequentially through the first safety regulation capacitor 601, the first resistor 701, the second resistor 702, the third diode 401, the fourth resistor 402, the first voltage divider 300, and the second safety regulation capacitor 801, which are connected in series, of the two resistors, the voltage at the two ends of the first voltage divider 300 is not 0, and the flame state is detected according to the voltage at the two ends of the first voltage divider detected by the voltage testing device in real time.
According to another exemplary embodiment of the present application, there is provided an ignition fire detection system, including any one of the ignition fire detection circuits, a fire outlet, and a processor, wherein the processor is configured to receive a voltage value output by a voltage test device, determine whether the fire outlet has a flame and/or a flame condition according to the voltage value, and determine whether the fire outlet has a flame and/or a flame state.
The ignition fire detection system comprises the ignition fire detection circuit, the fire outlet and the processor, the voltage value output by the voltage test device is received by the processor, and whether flame exists at the fire outlet and/or the flame state is determined according to the voltage value. Compare and examine the problem that the fire carried out mutual interference simultaneously in prior art, the ignition of this application is examined thermal circuit and is parallelly connected through setting up, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the crisscross of ignition branch road and examining the fire branch road and switch on, and then realize the ignition and examine the crisscross of fire going on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining fire and going on simultaneously with the fire, it is higher to have guaranteed that the accuracy that the ignition system of examining detected is higher, the abnormal scheduling problem of damaging even of components and parts function that has avoided the interference to cause simultaneously.
In a specific embodiment, the processor is configured to determine that the flame exists at the fire outlet when the voltage value is greater than a predetermined voltage.
According to still another exemplary embodiment of the present application, there is also provided a gas water heater including the ignition and fire detection system described above.
The gas water heater comprises the ignition fire detection system, the ignition fire detection system receives the voltage value output by the voltage test device through the processor, and determines whether flame exists at the fire outlet and/or the flame state according to the voltage value. Compare in prior art the problem that the ignition carried out mutual interference simultaneously, the gas heater of this application is through setting up parallelly connected, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the crisscross of ignition branch road and examining the fire branch road and switch on, and then realize the crisscross of igniteing and examining the fire and go on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining the ignition and going on simultaneously with the ignition, it is higher to have guaranteed that gas heater's ignition detects the accuracy of fire and detects, the abnormal component function that has avoided simultaneously disturbing to cause damages scheduling problem even.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) in the above ignition fire detection circuit of the present application, the first switch device and the igniter are connected in series to form an ignition branch, the first voltage divider device is connected in series with the fire outlet to form a fire detection branch, the ignition branch is connected in parallel with the fire detection branch and then electrically connected to the ac power supply, when the fire outlet has no flame, the fire detection branch is not conducted, both ends of the first voltage divider device have no voltage difference, when the ac power supply provides a current in a first direction, the first switch device is closed, the ignition branch is conducted, the igniter starts to store charges, when the stored charges are sufficient, the fire outlet is ignited by discharging, so that the fire outlet has a flame in a conducting direction in a second direction, when the ac power supply provides a current in the second direction and the fire outlet has a flame, the fire detection branch is conducted, the voltage difference occurs at both ends of the first voltage divider device, and the voltage values at both ends of the first voltage divider device are detected by the voltage test device, the function of fire detection can be realized. Compare and examine the problem that the fire carried out mutual interference simultaneously among prior art, this application is through setting up parallelly connected, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the ignition branch road and examine the crisscross of fire branch road and switch on, and then realize the crisscross of igniteing and examining the fire and go on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining fire and going on simultaneously with the fire, it is higher to have guaranteed the accuracy that detects, the abnormal scheduling problem of damaging even of components and parts function of having avoided disturbing the cause has simultaneously.
2) The ignition fire detection system comprises the ignition fire detection circuit, a fire outlet and a processor, wherein the processor receives a voltage value output by a voltage test device, and determines whether flame exists at the fire outlet and/or the flame state according to the voltage value. Compare and examine the problem that the fire carried out mutual interference simultaneously in prior art, the ignition of this application is examined thermal circuit and is parallelly connected through setting up, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the crisscross of ignition branch road and examining the fire branch road and switch on, and then realize the ignition and examine the crisscross of fire going on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining fire and going on simultaneously with the fire, it is higher to have guaranteed that the accuracy that the ignition system of examining detected is higher, the abnormal scheduling problem of damaging even of components and parts function that has avoided the interference to cause simultaneously.
3) The ignition fire detection system receives the voltage value output by the voltage test device through the processor, and determines whether flame exists at the fire outlet and/or the flame state according to the voltage value. Compare in prior art the problem that the ignition carried out mutual interference simultaneously, the gas heater of this application is through setting up parallelly connected, switch on opposite direction's ignition branch road and examine the fire branch road, like this along with alternating current power supply's current direction periodic variation, can realize the crisscross of ignition branch road and examining the fire branch road and switch on, and then realize the crisscross of igniteing and examining the fire and go on, when guaranteeing that circuit structure is comparatively simple, interference between the two when having avoided examining the ignition and going on simultaneously with the ignition, it is higher to have guaranteed that gas heater's ignition detects the accuracy of fire and detects, the abnormal component function that has avoided simultaneously disturbing to cause damages scheduling problem even.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. An ignition detection circuit, comprising:
a first switching device having a first terminal for electrical connection with a first terminal of an AC power source, the first switching device configured to close if a current direction of the AC power source is a first direction and open if the current direction of the AC power source is a second direction, the first direction being opposite to the second direction;
an igniter having a first end electrically connected to the second end of the first switching device and a second end for electrically connecting to the second end of the ac power source, the igniter being configured to store electric charges when the first switching device is closed and to discharge electricity to ignite a fire hole when the stored electric charges are greater than a predetermined value, the fire hole having a flame conducting direction in the same direction as the second direction;
a first voltage divider, a first end of which is used for being connected with the first end of the fire outlet, a second end of which is used for being electrically connected with the first end of the alternating current power supply, and a second end of the fire outlet is connected with the second end of the alternating current power supply, or a second end of which is used for being electrically connected with the second end of the alternating current power supply, and the second end of the fire outlet is connected with the first end of the alternating current power supply;
and the voltage testing device is used for detecting and outputting the voltage values at two ends of the first voltage divider.
2. The ignition detecting circuit according to claim 1, characterized by further comprising:
a second switching device through which a second terminal of the igniter is electrically connected to a second terminal of the AC power supply, the second switching device being configured to be closed when a current direction of the AC power supply is the first direction and to be opened when the current direction of the AC power supply is the second direction.
3. The ignition and fire detection circuit of claim 2, wherein the first switching device and the second switching device are both unidirectional conducting devices, the first switching device includes a first diode, the second switching device includes a second diode, and the first direction is a direction in which anodes of the first diode and the second diode point to a cathode.
4. The ignition and fire detection circuit according to claim 1, further comprising:
the first end of the first filter device is used for being electrically connected with the second end of the alternating current power supply, and the second end of the first filter is used for being electrically connected with the second end of the fire outlet.
5. The ignition and fire detection circuit according to claim 4, further comprising:
and the second end of the first filter device is electrically connected with the second end of the fire outlet through the second voltage divider device.
6. The ignition fire detection circuit of claim 4 wherein said first filter device includes at least one first safety capacitor.
7. The ignition and fire detection circuit according to claim 1, further comprising:
and the second end of the first voltage division device is electrically connected with the first end of the alternating current power supply through the second filter device.
8. The ignition and fire detection circuit of claim 7 wherein said second filter device includes at least one second safety capacitor.
9. The ignition and fire detection circuit according to any one of claims 1 to 8, wherein the first voltage divider means includes a capacitor and/or a resistor.
10. An ignition and fire detection system, comprising:
the ignition detecting circuit according to any one of claims 1 to 9;
a fire outlet;
and the processor is used for receiving the voltage value output by the voltage testing device, determining whether flame and/or a flame state exist at the fire outlet according to the voltage value.
11. The ignition fire detection system of claim 10, wherein the processor is configured to determine that the flame is present at the fire outlet if the voltage value is greater than a predetermined voltage.
12. A gas water heater comprising an ignition and fire detection system as claimed in claim 10 or 11.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725352.8A CN115031836B (en) | 2022-06-24 | 2022-06-24 | Ignition fire detection circuit and ignition fire detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210725352.8A CN115031836B (en) | 2022-06-24 | 2022-06-24 | Ignition fire detection circuit and ignition fire detection system |
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| Publication Number | Publication Date |
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| CN115031836A true CN115031836A (en) | 2022-09-09 |
| CN115031836B CN115031836B (en) | 2024-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210725352.8A Active CN115031836B (en) | 2022-06-24 | 2022-06-24 | Ignition fire detection circuit and ignition fire detection system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1517522A (en) * | 1967-04-04 | 1968-03-15 | Fenwal Inc | Electric gas ignition and flame control system |
| CN105891581A (en) * | 2016-05-26 | 2016-08-24 | 珠海格力电器股份有限公司 | Flame detection circuit and flame ignition detection circuit |
| CN114123804A (en) * | 2021-11-18 | 2022-03-01 | 珠海格力电器股份有限公司 | Ignition and fire detection circuit, ignition and fire detection device and gas device |
| CN218066751U (en) * | 2022-06-24 | 2022-12-16 | 珠海格力电器股份有限公司 | Ignition fire detection circuit, ignition fire detection system and gas water heater |
-
2022
- 2022-06-24 CN CN202210725352.8A patent/CN115031836B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1517522A (en) * | 1967-04-04 | 1968-03-15 | Fenwal Inc | Electric gas ignition and flame control system |
| CN105891581A (en) * | 2016-05-26 | 2016-08-24 | 珠海格力电器股份有限公司 | Flame detection circuit and flame ignition detection circuit |
| CN114123804A (en) * | 2021-11-18 | 2022-03-01 | 珠海格力电器股份有限公司 | Ignition and fire detection circuit, ignition and fire detection device and gas device |
| CN218066751U (en) * | 2022-06-24 | 2022-12-16 | 珠海格力电器股份有限公司 | Ignition fire detection circuit, ignition fire detection system and gas water heater |
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|---|---|
| CN115031836B (en) | 2024-08-09 |
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