CN216385988U - Flame detection circuit with self-detection function - Google Patents
Flame detection circuit with self-detection function Download PDFInfo
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- CN216385988U CN216385988U CN202123181486.8U CN202123181486U CN216385988U CN 216385988 U CN216385988 U CN 216385988U CN 202123181486 U CN202123181486 U CN 202123181486U CN 216385988 U CN216385988 U CN 216385988U
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Abstract
The utility model discloses a flame detection circuit with a self-detection function, which comprises resistors R1-R9, capacitors C1-C2, switch diodes D1-D3, a triode Q1, an isolation step-up transformer T1, a comparator circuit IC1A, a direct-current power supply VCC, an electrical ground GND, a pulse square wave signal input port A, a flame probe FID and a flame signal output detection port B, wherein the pulse square wave signal input port A, the resistors R1-R3, the diode D1, the triode Q1, the isolation step-up transformer T1 and the direct-current power supply VCC form a pulse excitation oscillation circuit; the flame detection circuit is composed of resistors R4-R9, diodes D2-D3, capacitors C1-C2, a comparator circuit IC1A, a direct current power supply VCC (positive and negative), an electrical ground GND, a flame probe FID and a flame signal output detection port B; the utility model can realize effective detection of flame signals, can independently detect and identify the functional effectiveness of the circuit, and has higher practical value and cost performance.
Description
Technical Field
The utility model relates to the technical field of detection of gas appliances, in particular to a flame detection circuit with a self-detection function.
Background
In the field of gas appliance product control, flame detection is an indispensable technology. In the conventional design, the flame detection is only an independent module with a single function, the emphasis is only on the effectiveness of flame signal detection, and the effectiveness of the detection circuit is ignored, so that the flame detection cannot be realized when the effectiveness of the detection is lacked due to the self-function failure of the detection circuit in the system.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a flame detection circuit with a self-detection function, which can solve the above-mentioned problems of the background art.
In order to achieve the purpose, the utility model provides the following technical scheme:
1. a flame detection circuit with a self-detection function comprises resistors R1-R9, capacitors C1-C2, switch diodes D1-D3, a PNP triode Q1, an isolation step-up transformer T1, a comparator circuit IC1A, a direct current power supply VCC (VCC) electrically grounded GND, a pulse square wave signal input port A, a flame probe FID and a flame signal output detection port B, wherein the pulse square wave signal input port A, the resistors R1-R3, the diode D1, the PNP triode Q1, the isolation step-up transformer T1 and the direct current power supply VCC form a pulse excitation oscillation circuit; the resistors R4-R9, the diodes D2-D3, the capacitors C1-C2, the comparator circuit IC1A, the direct current power supply VCC, the electrical ground GND, the flame probe FID and the flame signal output detection port B form a flame detection circuit.
As an improvement, a pulse square wave signal input port A is connected with one end of a resistor R1 in series, the other end of the resistor R1 is connected with a resistor R2 and the base electrode of a PNP triode Q1, the other end of the resistor R2 is connected with a resistor R3 and the emitting electrode of the PNP triode Q1, and the collecting electrode of the PNP triode Q1 is connected with the negative electrode of a system direct-current power supply; the other end of the resistor R3 is connected with the anode of the diode D1 and one end of the primary end of the isolation boosting transformer T1, and the cathode of the diode D1 is connected with the other end of the primary end of the isolation boosting transformer T1 and then is connected to the anode of the direct-current power supply VCC; after one end of the secondary end of the isolation boosting transformer T1 is connected with the resistor R4 in series, the other end of the resistor R4 is connected to the flame probe FID; the other end of the secondary end of the isolation boosting transformer T1 is connected with a capacitor C1 and a resistor R5, and the other end of the capacitor C1 is connected with an electrical ground GND and a resistor R6; the other end of the resistor R5 is connected with the cathode of the diode D2, the anode of the diode D3, the resistor R7 and the same-phase end of the comparator circuit IC 1A; the other end of the resistor R6 is connected with the anode of the diode D2, the cathode of the diode D3, the inverting terminal of the comparator circuit IC1A and the cathode of the direct-current power supply VCC; the other end of the resistor R7 is connected with the resistor R8, the power supply anode of the comparator circuit IC1A and the anode of the direct current power supply VCC; the other end of the resistor R8 is connected with an output port of the comparator circuit IC1A, the capacitor C2 and the resistor R9; the other end of the resistor R9 is connected to the flame signal output detection port B, and the other end of the capacitor C2 is connected with the negative electrode of the direct-current power supply VCC.
As an improvement, the basic principle is as follows: the system can independently input a pulse square wave signal with frequency programmable control and certain driving power according to requirements at a pulse square wave signal input port A, switch modulation is carried out on a triode Q1, the voltage loaded at the primary end of an isolation boosting transformer T1 is also in a switch modulation state, the primary end of T1 is in a pulse excitation oscillation state through the self-inductance effect of a transformer coil, and then alternating voltage of certain voltage is generated at the secondary end of T1 through the alternating boosting effect of the transformer. When the pulse square wave signal input port A is not loaded with a pulse square wave signal and the flame probe FID end is not provided with a flame signal, the secondary end of the isolation step-up transformer T1 is not provided with an alternating current voltage signal, and the post-stage circuits of the transformer are in a direct current static working state, so that under the forward clamping action of the diode D3, the voltage difference between the in-phase end and the reverse-phase end of the comparator circuit IC1A is the conduction voltage drop of the diode D3 and is about 0.3-0.7V, and the output port of the comparator circuit IC1A is at a high level; when a pulse square wave signal is loaded on the pulse square wave signal input port A and flame burning exists at the flame probe FID end, an alternating current voltage signal at the secondary end of the isolation boosting transformer T1 is loaded on flame through the flame probe FID, through the conduction and alternating current rectification action of flame ions, lower positive direct current voltage and upper negative direct current voltage are generated at two ends of a capacitor C1, through voltage sampling of resistors R5 and R6 and the positive clamping action of a diode D2, the voltages of the in-phase end and the reverse end of a comparator circuit IC1A are inverted, the previous positive voltage is switched into negative voltage, the voltage value is-0.3 to-0.7V, and therefore the output port of the comparator circuit IC1A is at a low level. Therefore, the aim of detecting the flame signal can be achieved.
As an improvement, the system can realize self-detection on the effectiveness of the flame detection circuit by combining the level detection of the flame signal output detection port B according to the fact that whether the pulse signal of the pulse square wave signal input port A is input or not. When no pulse signal is input into the pulse square wave signal input port A, no matter whether flame burning exists at the FID end of the flame probe, the B end of the flame signal output detection port is in a normal high level; when a pulse signal is input into the pulse square wave signal input port A, if the flame probe FID end is flameless and burns, the flame signal output detection port B end is also at a normal high level; when the pulse signal is input into the pulse square wave signal input port A, if flame burns at the FID end of the flame probe, the B end of the flame signal output detection port is detected to be low level. When the condition of violating the logic occurs, the system judges that the function of the flame detection circuit is invalid, and therefore, the system stops working actively and gives an alarm to avoid the occurrence of system safety risks.
As an improvement, the system can realize self-detection on the effectiveness of the flame detection circuit by combining the level detection of the flame signal output detection port B according to the fact that whether the pulse signal of the pulse square wave signal input port A is input or not. When no pulse signal is input into the pulse square wave signal input port A, no matter whether flame burning exists at the FID end of the flame probe, the B end of the flame signal output detection port is in a normal high level; when a pulse signal is input into the pulse square wave signal input port A, if the flame probe FID end is flameless and burns, the flame signal output detection port B end is also at a normal high level; when the pulse signal is input into the pulse square wave signal input port A, if flame burns at the FID end of the flame probe, the B end of the flame signal output detection port is detected to be low level. When the condition of violating the logic occurs, the system judges that the function of the flame detection circuit is invalid, and therefore, the system stops working actively and gives an alarm to avoid the occurrence of system safety risks.
As an improvement, the turn ratio between the primary side and the secondary side of the isolation boosting transformer T1 is between 1:20 and 1:30, so that the sufficient boosting effect of the transformer is ensured.
As a refinement, the comparator circuit IC1A includes, but is not limited to, LM393, LM339 and their equivalents, which can replace the comparator circuit, and the comparative voltage precision is not lower than + -0.2V.
As an improvement, the pulse square wave signal loaded on the pulse square wave signal input port A is based on the rated working frequency of the adopted isolation boosting transformer T1, and the signal frequency is within the range of +/-20% of the rated working frequency of the transformer T1.
As an improvement, the transistor Q1 is a PNP transistor, but an NPN transistor may also be used, but the circuit connection needs to adopt the method shown in fig. 2.
Compared with the prior art, the utility model has the beneficial effects that:
the circuit can realize effective detection of flame signals, can independently detect and identify the functional effectiveness of the circuit, has higher practical value and cost performance, and is technically more breakthrough.
Drawings
Fig. 1 is a schematic diagram of a hardware circuit of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a hardware circuit of another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1, in the embodiment of the present invention, the pulse excitation oscillation circuit includes resistors R1 to R9, capacitors C1 to C2, switching diodes D1 to D3, a PNP transistor Q1, an isolation step-up transformer T1, a comparator circuit IC1A, a dc power source VCC electrical ground GND, a pulse square wave signal input port a, a flame probe FID, and a flame signal output detection port B, where the pulse square wave signal input port a, the resistors R1 to R3, the diode D1, the PNP transistor Q1, the isolation step-up transformer T1, and the dc power source VCC form a pulse excitation oscillation circuit; the resistors R4-R9, the diodes D2-D3, the capacitors C1-C2, the comparator circuit IC1A, the direct current power supply VCC, the electrical ground GND, the flame probe FID and the flame signal output detection port B form a flame detection circuit.
As shown in fig. 1, in the circuit, a pulse square wave signal input port a is connected in series with one end of a resistor R1, the other end of the resistor R1 is connected with a resistor R2 and a base of a PNP transistor Q1, the other end of the resistor R2 is connected with a resistor R3 and an emitter of a PNP transistor Q1, and a collector of the PNP transistor Q1 is connected with a negative electrode of a system dc power supply; the other end of the resistor R3 is connected with the anode of the diode D1 and one end of the primary end of the isolation boosting transformer T1, and the cathode of the diode D1 is connected with the other end of the primary end of the isolation boosting transformer T1 and then is connected to the anode of the direct-current power supply VCC; after one end of the secondary end of the isolation boosting transformer T1 is connected with the resistor R4 in series, the other end of the resistor R4 is connected to the flame probe FID; the other end of the secondary end of the isolation boosting transformer T1 is connected with a capacitor C1 and a resistor R5, and the other end of the capacitor C1 is connected with an electrical ground GND and a resistor R6; the other end of the resistor R5 is connected with the cathode of the diode D2, the anode of the diode D3, the resistor R7 and the same-phase end of the comparator circuit IC 1A; the other end of the resistor R6 is connected with the anode of the diode D2, the cathode of the diode D3, the inverting terminal of the comparator circuit IC1A and the cathode of the direct-current power supply VCC; the other end of the resistor R7 is connected with the resistor R8, the power supply anode of the comparator circuit IC1A and the anode of the direct current power supply VCC; the other end of the resistor R8 is connected with an output port of the comparator circuit IC1A, the capacitor C2 and the resistor R9; the other end of the resistor R9 is connected to the flame signal output detection port B, and the other end of the capacitor C2 is connected with the negative electrode of the direct-current power supply VCC.
As shown in fig. 1, in the circuit, a pulse square wave signal with a frequency programmable control and a certain driving power can be autonomously input to a pulse square wave signal input port a of the system according to needs, a triode Q1 is subjected to switching modulation, so that the voltage loaded on the primary end of an isolation boosting transformer T1 is also in a switching modulation state, the primary end of T1 is in a pulse excitation oscillation state through the self-inductance action of a transformer coil, and then an alternating boosting action of the transformer is performed, so that an alternating current voltage with a certain voltage is generated on the secondary end of T1. When the pulse square wave signal input port A is not loaded with a pulse square wave signal and the flame probe FID end is not provided with a flame signal, the secondary end of the isolation step-up transformer T1 is not provided with an alternating current voltage signal, and the post-stage circuits of the transformer are in a direct current static working state, so that under the forward clamping action of the diode D3, the voltage difference between the in-phase end and the reverse-phase end of the comparator circuit IC1A is the conduction voltage drop of the diode D3 and is about 0.3-0.7V, and the output port of the comparator circuit IC1A is at a high level; when a pulse square wave signal is loaded on the pulse square wave signal input port A and flame burning exists at the flame probe FID end, an alternating current voltage signal at the secondary end of the isolation boosting transformer T1 is loaded on flame through the flame probe FID, through the conduction and alternating current rectification action of flame ions, lower positive direct current voltage and upper negative direct current voltage are generated at two ends of a capacitor C1, through voltage sampling of resistors R5 and R6 and the positive clamping action of a diode D2, the voltages of the in-phase end and the reverse end of a comparator circuit IC1A are inverted, the previous positive voltage is switched into negative voltage, the voltage value is-0.3 to-0.7V, and therefore the output port of the comparator circuit IC1A is at a low level. Therefore, the aim of detecting the flame signal can be achieved.
As shown in FIG. 1, in the circuit, the system can realize self-detection of the function effectiveness of the flame detection circuit by combining the level detection of the flame signal output detection port B according to the input or non-input of the pulse signal of the pulse square wave signal input port A. When no pulse signal is input into the pulse square wave signal input port A, no matter whether flame burning exists at the FID end of the flame probe, the B end of the flame signal output detection port is in a normal high level; when a pulse signal is input into the pulse square wave signal input port A, if the flame probe FID end is flameless and burns, the flame signal output detection port B end is also at a normal high level; when the pulse signal is input into the pulse square wave signal input port A, if flame burns at the FID end of the flame probe, the B end of the flame signal output detection port is detected to be low level. When the condition of violating the logic occurs, the system judges that the function of the flame detection circuit is invalid, and therefore, the system stops working actively and gives an alarm to avoid the occurrence of system safety risks.
Example 2:
as shown in fig. 2, based on embodiment 1, the transistor Q1 is an NPN type transistor, where the input port a of the pulse square wave signal is connected in series with one end of the resistor R1, the other end of the resistor R1 is connected to the resistor R2 and the base of the NPN transistor Q1, and the other end of the resistor R2 is connected to the emitter of the NPN transistor Q1 and the negative electrode of the system dc power supply; resistor R3 is connected to the collector of NPN transistor Q1. The other parts of the circuit are identical to those of embodiment 1.
In the present embodiment, the turn ratio between the primary and secondary sides of the isolation step-up transformer T1 is between 1:20 and 1:30, so as to ensure sufficient step-up effect of the transformer. The comparator circuit IC1A includes, but is not limited to, LM393, LM339 and their equivalent replaceable comparator circuits, and its comparable voltage precision is not lower than + -0.2V. The pulse square wave signal loaded at the pulse square wave signal input port a should be based on the rated working frequency of the adopted isolation step-up transformer T1, and the signal frequency should be within ± 20% of the rated working frequency of the transformer T1. The above parameters will be understood by those skilled in the art and will not be described in detail herein.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A flame detection circuit with a self-detection function comprises resistors R1-R9, capacitors C1-C2, switch diodes D1-D3, PNP triodes Q1, an isolation step-up transformer T1, a comparator circuit IC1A, a direct-current power supply VCC (VCC) electrically grounded GND, a pulse square wave signal input port A, a flame probe FID and a flame signal output detection port B, and is characterized in that the pulse square wave signal input port A, the resistors R1-R3, the diode D1, the PNP triode Q1, the isolation step-up transformer T1 and the direct-current power supply VCC form a pulse excitation oscillation circuit; the resistors R4-R9, the diodes D2-D3, the capacitors C1-C2, the comparator circuit IC1A, the direct current power supply VCC, the electrical ground GND, the flame probe FID and the flame signal output detection port B form a flame detection circuit.
2. The flame detection circuit with self-test function as claimed in claim 1, wherein the input port a of the pulse square wave signal is connected in series with one end of a resistor R1, the other end of the resistor R1 is connected with a resistor R2 and the base of a PNP transistor Q1, the other end of the resistor R2 is further connected with a resistor R3 and the emitter of a PNP transistor Q1, and the collector of the PNP transistor Q1 is connected with the negative pole of the system dc power supply; the other end of the resistor R3 is connected with the anode of the diode D1 and one end of the primary end of the isolation boosting transformer T1, and the cathode of the diode D1 is connected with the other end of the primary end of the isolation boosting transformer T1 and then is connected to the anode of the direct-current power supply VCC; after one end of the secondary end of the isolation boosting transformer T1 is connected with the resistor R4 in series, the other end of the resistor R4 is connected to the flame probe FID; the other end of the secondary end of the isolation boosting transformer T1 is connected with a capacitor C1 and a resistor R5, and the other end of the capacitor C1 is connected with an electrical ground GND and a resistor R6; the other end of the resistor R5 is connected with the cathode of the diode D2, the anode of the diode D3, the resistor R7 and the same-phase end of the comparator circuit IC 1A; the other end of the resistor R6 is connected with the anode of the diode D2, the cathode of the diode D3, the inverting terminal of the comparator circuit IC1A and the cathode of the direct-current power supply VCC; the other end of the resistor R7 is connected with the resistor R8, the power supply anode of the comparator circuit IC1A and the anode of the direct current power supply VCC; the other end of the resistor R8 is connected with an output port of the comparator circuit IC1A, the capacitor C2 and the resistor R9; the other end of the resistor R9 is connected to the flame signal output detection port B, and the other end of the capacitor C2 is connected with the negative electrode of the direct-current power supply VCC.
3. The flame detection circuit with self-detection function as claimed in claim 1, wherein the turn ratio between the primary and secondary sides of the isolation step-up transformer T1 is between 1:20 and 1:30 to ensure sufficient step-up effect of the transformer.
4. The flame detection circuit with self-test function as claimed in claim 1, wherein said comparator circuit IC1A includes, but is not limited to, LM393, LM339 and their equivalent replaceable comparator circuits, and its comparable voltage accuracy is not lower than + -0.2V.
5. The flame detection circuit with self-test function as claimed in claim 1, wherein the pulsed square wave signal applied to the pulsed square wave signal input port a is within ± 20% of the rated operating frequency of the transformer T1 based on the rated operating frequency of the isolation step-up transformer T1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123181486.8U CN216385988U (en) | 2021-12-17 | 2021-12-17 | Flame detection circuit with self-detection function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123181486.8U CN216385988U (en) | 2021-12-17 | 2021-12-17 | Flame detection circuit with self-detection function |
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| CN216385988U true CN216385988U (en) | 2022-04-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353301A (en) * | 2023-12-04 | 2024-01-05 | 珠海格力电器股份有限公司 | Flame detection power supply circuit, flame detection device and ignition equipment |
| CN117748936A (en) * | 2024-02-19 | 2024-03-22 | 成都麦特斯科技有限公司 | Low-power consumption boost system |
-
2021
- 2021-12-17 CN CN202123181486.8U patent/CN216385988U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117353301A (en) * | 2023-12-04 | 2024-01-05 | 珠海格力电器股份有限公司 | Flame detection power supply circuit, flame detection device and ignition equipment |
| CN117353301B (en) * | 2023-12-04 | 2024-04-23 | 珠海格力电器股份有限公司 | Flame detection power supply circuit, flame detection device and ignition equipment |
| CN117748936A (en) * | 2024-02-19 | 2024-03-22 | 成都麦特斯科技有限公司 | Low-power consumption boost system |
| CN117748936B (en) * | 2024-02-19 | 2024-04-26 | 成都麦特斯科技有限公司 | Low-power consumption boost system |
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