CN113281562A - Flame ion current detection circuit and gas appliance - Google Patents
Flame ion current detection circuit and gas appliance Download PDFInfo
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- CN113281562A CN113281562A CN202110434037.5A CN202110434037A CN113281562A CN 113281562 A CN113281562 A CN 113281562A CN 202110434037 A CN202110434037 A CN 202110434037A CN 113281562 A CN113281562 A CN 113281562A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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Abstract
The invention relates to a flame ion current detection circuit and a gas appliance. In the flame ion current detection circuit, a direct current voltage supply circuit is used for generating direct current voltage; the first voltage detection circuit is used for detecting a first voltage output by the direct-current voltage power supply circuit, and the second voltage detection circuit is used for detecting a second voltage at two ends of the shunt circuit; the processor obtains a third voltage at two ends of the current limiting circuit according to the difference value of the first voltage and the second voltage, obtains a first current according to the third voltage and a first preset resistor corresponding to the current limiting circuit, obtains a second current according to the second voltage and a second preset resistor corresponding to the shunt circuit, and obtains flame ion current passing through the fire detection needle electrode according to the difference value of the first current and the second current. The invention uses direct current voltage to act on the fire detection needle electrode to indirectly measure flame ion current, has high detection sensitivity and low probability of missed detection and false detection, and is beneficial to improving the gas combustion efficiency of a gas appliance.
Description
Technical Field
The invention relates to the field of gas appliances, in particular to a flame ion current detection circuit and a gas appliance.
Background
The gas of the gas appliance can generate flame ion current in the combustion process, and the combustion state of the flame ion current gas can be used for controlling the combustion process. In the prior art, the detection sensitivity of flame ion current is not high, and the problems of missing detection, false detection and the like exist, so that the control of the combustion process is influenced.
Disclosure of Invention
The present invention is directed to a flame ion current detection circuit and a gas appliance, which are provided to overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the flame ion current detection circuit is constructed and comprises a direct-current voltage power supply circuit, a current limiting circuit, a shunt circuit, a first voltage detection circuit, a second voltage detection circuit, a processor, a fire detection needle electrode and a metal shell electrode;
the output end of the direct-current voltage power supply circuit is respectively connected with the fire detection needle electrode and the shunt circuit through the current limiting circuit, the output end of the direct-current voltage power supply circuit is connected with the processor through the first voltage detection circuit, and the shunt circuit is connected with the processor through the second voltage detection circuit;
the direct-current voltage supply circuit is used for generating direct-current voltage; the first voltage detection circuit is used for detecting a first voltage output by the direct-current voltage power supply circuit, and the second voltage detection circuit is used for detecting a second voltage at two ends of the shunt circuit; the processor obtains a third voltage at two ends of the current limiting circuit according to the difference value of the first voltage and the second voltage, obtains a first current according to the third voltage and a first preset resistor corresponding to the current limiting circuit, obtains a second current according to the second voltage and a second preset resistor corresponding to the shunt circuit, and obtains a flame ion current passing through the fire detection needle electrode according to the difference value of the first current and the second current.
Further, in the flame ion current detection circuit of the present invention, the dc voltage supply circuit includes a dc voltage generating circuit, a dc voltage control circuit, and a dc voltage coupling circuit, the dc voltage generating circuit is connected to the dc voltage coupling circuit through the dc voltage control circuit, and the dc voltage coupling circuit is connected to the current circuit.
Further, in the flame ion current detection circuit of the present invention, the first voltage detection circuit includes a first voltage conversion circuit and a first AD sampling circuit, an input end of the first voltage conversion circuit is connected to an output end of the dc voltage supply circuit, and an output end of the first voltage conversion circuit is connected to the processor through the first AD sampling circuit; the first voltage conversion circuit is used for converting a high voltage into a low voltage.
Further, in the flame ion current detection circuit of the present invention, the processor obtains the first voltage according to a first sampling voltage of the first AD sampling circuit and a first conversion ratio of the first voltage conversion circuit.
Further, in the flame ion current detection circuit of the present invention, the first voltage conversion circuit is a resistance voltage divider circuit, the first sampling voltage is a voltage of a sampling resistance, and the first conversion ratio is a resistance voltage division ratio.
Further, in the flame ion current detection circuit of the present invention, the second voltage detection circuit includes a second voltage conversion circuit and a second AD sampling circuit, an input end of the second voltage conversion circuit is connected to the shunt circuit, and an output end of the second voltage conversion circuit is connected to the processor through the second AD sampling circuit; the second voltage conversion circuit is used for converting a high voltage into a low voltage.
Further, in the flame ion current detection circuit of the present invention, the processor obtains the second voltage according to a second sampling voltage of the second AD sampling circuit and a second conversion ratio of the second voltage conversion circuit.
Further, in the flame ion current detection circuit of the present invention, the second voltage conversion circuit is a resistance voltage divider circuit, the second sampling voltage is a voltage of a sampling resistance, and the first conversion ratio is a resistance voltage division ratio.
Further, in the flame ion current detection circuit of the present invention, the dc voltage generated by the dc voltage supply circuit is a pulse dc voltage.
In addition, the invention also provides a gas appliance which comprises the flame ion current detection circuit.
The flame ion current detection circuit and the gas appliance have the following beneficial effects: the invention uses direct current voltage to act on the fire detection needle electrode to indirectly measure flame ion current, has high detection sensitivity and low probability of missed detection and false detection, and is beneficial to improving the gas combustion efficiency of a gas appliance.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of a flame ion current detection circuit according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the flame ion current detection circuit of this embodiment includes a dc voltage supply circuit 10, a current limiting circuit 20, a shunt circuit 30, a first voltage detection circuit 40, a second voltage detection circuit 50, a processor 60, a firing pin electrode 70 and a metal casing electrode 80, an output end of the dc voltage supply circuit 10 is respectively connected to the firing pin electrode 70 and the shunt circuit 30 through the current limiting circuit 20, an output end of the dc voltage supply circuit 10 is connected to the processor 60 through the first voltage detection circuit 40, and the shunt circuit 30 is connected to the processor 60 through the second voltage detection circuit 50.
The working principle of the flame ion current detection circuit is as follows: the dc voltage supply circuit 10 is used for generating a dc voltage, and the dc voltage passes through the current limiting circuit 20 and then acts on the fire detection needle electrode 70 and the shunt circuit 30, wherein the dc voltage acting on the fire detection needle electrode 70 forms a dc electric field, and can excite a larger flame ion current. The first voltage detection circuit 40 is configured to detect a first voltage output by the dc voltage supply circuit 10, and the second voltage detection circuit 50 is configured to detect a second voltage across the shunt circuit 30. The processor 60 obtains a third voltage at two ends of the current limiting circuit 20 from a difference value between the first voltage and the second voltage, and obtains a first current from the third voltage and a first preset resistance corresponding to the current limiting circuit 20, that is, a ratio of the third voltage to the first preset resistance is the first current; the second voltage and the second preset resistance corresponding to the shunt circuit 30 obtain the second current, that is, the ratio of the second voltage and the second preset resistance is the second current. Further, since the current passing through the current limiting circuit 20 is a main current, the current passing through the fire detection needle electrode 70 is a first branch current, the current passing through the shunt current is a second branch current, and the main current is equal to the sum of the first branch current and the second direct current, the difference between the main current and one of the branch currents is the other branch current, that is, the flame ion current passing through the fire detection needle electrode 70 is obtained from the difference between the first current and the second current.
The embodiment uses direct current voltage to act on the fire detection needle electrode, indirectly measures flame ion current, has high detection sensitivity and low missed detection and false detection probability, and is favorable for improving the gas combustion efficiency of a gas appliance.
In some embodiments of the flame ion current detection circuit, the dc voltage supply circuit 10 includes a dc voltage generating circuit 101, a dc voltage control circuit 102, and a dc voltage coupling circuit 103, wherein the dc voltage generating circuit 101 is connected to the dc voltage coupling circuit 103 through the dc voltage control circuit 102, and the dc voltage coupling circuit 103 is connected to the current circuit. The direct-current voltage generating circuit 101 generates direct-current voltage, the direct-current voltage is converted by the direct-current voltage control circuit 102 and then is input into the direct-current voltage coupling circuit 103, the direct-current voltage coupling circuit 103 has a voltage isolation effect, the direct-current voltage power supply circuit 10 is prevented from directly acting on the fire detection needle electrode 70, and safety is improved.
In the flame ion current detection circuit of some embodiments, the first voltage detection circuit 40 includes a first voltage conversion circuit 401 and a first AD sampling circuit 402, an input terminal of the first voltage conversion circuit 401 is connected to an output terminal of the dc voltage supply circuit 10, and an output terminal of the first voltage conversion circuit 401 is connected to the processor 60 through the first AD sampling circuit 402; the first voltage conversion circuit 401 is used to convert the high voltage into the low voltage to facilitate the sampling by the first AD sampling circuit 402, and also to facilitate the signal receiving and processing by the processor 60.
In the flame ion current detection circuit of some embodiments, the processor 60 stores therein a first conversion ratio, and the processor 60 obtains a first voltage from the first sampling voltage of the first AD sampling circuit 402 and the first conversion ratio of the first voltage conversion circuit 401.
In the flame ion current detection circuit of some embodiments, the first voltage conversion circuit 401 is a resistance voltage division circuit, the first sampling voltage is a voltage of a sampling resistance, and the first conversion ratio is a resistance voltage division ratio. That is, the processor 60 stores the voltage-to-resistance ratio, and calculates the first voltage from the first sampled voltage and the voltage-to-resistance ratio.
In the flame ion current detection circuit of some embodiments, the second voltage detection circuit 50 includes a second voltage conversion circuit 501 and a second AD sampling circuit 502, an input end of the second voltage conversion circuit 501 is connected to the shunt circuit 30, and an output end of the second voltage conversion circuit 501 is connected to the processor 60 through the second AD sampling circuit 502; the second voltage converting circuit 501 is used to convert the high voltage into the low voltage, so as to facilitate the sampling by the second AD sampling circuit 502, and also facilitate the signal receiving and processing by the processor 60.
In the flame ion current detection circuit of some embodiments, the processor 60 stores a second conversion ratio, and the processor 60 obtains a second voltage according to the second sampling voltage of the second AD sampling circuit 502 and the second conversion ratio of the second voltage conversion circuit 501.
In the flame ion current detection circuit of some embodiments, the second voltage conversion circuit 501 is a resistance voltage division circuit, the second sampling voltage is a voltage of a sampling resistance, and the first conversion ratio is a resistance voltage division ratio. That is, the processor 60 stores the voltage-to-resistance ratio, and calculates the first voltage from the second sampled voltage and the voltage-to-resistance ratio.
In some embodiments of the flame ion current detection circuit, the dc voltage generated by the dc voltage supply circuit 10 is a pulsed dc voltage.
In a preferred embodiment, the gas appliance of the present embodiment includes the flame ion current detection circuit as in the above-described embodiments. After the flame ion current detection circuit obtains the flame ion current, the current combustion condition of the gas can be judged according to the flame ion current, and then the gas is fully combusted by adjusting the proportion of the gas and the air, so that the fuel is saved and the emission of harmful gases is reduced. The embodiment uses direct current voltage to act on the fire detection needle electrode, indirectly measures flame ion current, has high detection sensitivity and low missed detection and false detection probability, and is favorable for improving the gas combustion efficiency of a gas appliance.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor (60), or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A flame ion current detection circuit is characterized by comprising a direct-current voltage power supply circuit (10), a current limiting circuit (20), a shunt circuit (30), a first voltage detection circuit (40), a second voltage detection circuit (50), a processor (60), a fire detection needle electrode (70) and a metal shell electrode (80);
the output end of the direct-current voltage power supply circuit (10) is respectively connected with the fire detection needle electrode (70) and the shunt circuit (30) through the current limiting circuit (20), the output end of the direct-current voltage power supply circuit (10) is connected with the processor (60) through the first voltage detection circuit (40), and the shunt circuit (30) is connected with the processor (60) through the second voltage detection circuit (50);
the direct-current voltage supply circuit (10) is used for generating direct-current voltage; the first voltage detection circuit (40) is used for detecting a first voltage output by the direct-current voltage supply circuit (10), and the second voltage detection circuit (50) is used for detecting a second voltage at two ends of the shunt circuit (30); the processor (60) obtains a third voltage at two ends of the current limiting circuit (20) according to the difference value of the first voltage and the second voltage, obtains a first current according to the third voltage and a first preset resistor corresponding to the current limiting circuit (20), obtains a second current according to the second voltage and a second preset resistor corresponding to the shunt circuit (30), and obtains a flame ion current passing through the fire detection needle electrode (70) according to the difference value of the first current and the second current.
2. The flame ionization current detection circuit according to claim 1, wherein the dc voltage supply circuit (10) comprises a dc voltage generating circuit (101), a dc voltage control circuit (102), and a dc voltage coupling circuit (103), the dc voltage generating circuit (101) is connected to the dc voltage coupling circuit (103) through the dc voltage control circuit (102), and the dc voltage coupling circuit (103) is connected to the current circuit.
3. The flame ion current detection circuit according to claim 1, wherein the first voltage detection circuit (40) comprises a first voltage conversion circuit (401) and a first AD sampling circuit (402), wherein an input end of the first voltage conversion circuit (401) is connected with an output end of the DC voltage supply circuit (10), and an output end of the first voltage conversion circuit (401) is connected with the processor (60) through the first AD sampling circuit (402); the first voltage conversion circuit (401) is used for converting a high voltage into a low voltage.
4. The flame ionization current detection circuit of claim 3, wherein the processor (60) derives the first voltage from a first sampled voltage of the first AD sampling circuit (402) and a first conversion ratio of the first voltage conversion circuit (401).
5. The flame ionization current detection circuit of claim 4, wherein the first voltage conversion circuit (401) is a resistor divider circuit, the first sampling voltage is a voltage of a sampling resistor, and the first conversion ratio is a resistor divider ratio.
6. The flame ionization current detection circuit according to claim 1, wherein the second voltage detection circuit (50) comprises a second voltage conversion circuit (501) and a second AD sampling circuit (502), wherein an input end of the second voltage conversion circuit (501) is connected to the shunt circuit (30), and an output end of the second voltage conversion circuit (501) is connected to the processor (60) through the second AD sampling circuit (502); the second voltage conversion circuit (501) is used for converting a high voltage into a low voltage.
7. The flame ionization current detection circuit of claim 6, wherein the processor (60) derives the second voltage from a second sampled voltage of the second AD sampling circuit (502) and a second conversion ratio of the second voltage conversion circuit (501).
8. The flame ionization current detection circuit of claim 7, wherein the second voltage conversion circuit (501) is a resistor divider circuit, the second sampling voltage is a voltage of a sampling resistor, and the first conversion ratio is a resistor divider ratio.
9. The flame ionization current detection circuit of claim 1, wherein the dc voltage generated by the dc voltage supply circuit (10) is a pulsed dc voltage.
10. A gas appliance comprising a flame ionization current detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110434037.5A CN113281562A (en) | 2021-04-22 | 2021-04-22 | Flame ion current detection circuit and gas appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110434037.5A CN113281562A (en) | 2021-04-22 | 2021-04-22 | Flame ion current detection circuit and gas appliance |
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| CN113281562A true CN113281562A (en) | 2021-08-20 |
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| CN202110434037.5A Pending CN113281562A (en) | 2021-04-22 | 2021-04-22 | Flame ion current detection circuit and gas appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
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| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
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Application publication date: 20210820 |