Integrated intelligent flame detector and detection method

Abstract

The invention discloses an integrated intelligent flame detector and a detection method, and belongs to the technical field of flame detectors. The output ends of a flame infrared signal detection circuit and a flame ultraviolet signal detection circuit are respectively connected with the input ends of an infrared detection signal processing circuit and an ultraviolet detection signal processing circuit of a main control unit; the input end and the output end of the display interface circuit of the main control unit are connected with the output end and the input end of the operation panel control unit; the input end of a key input processing circuit of the main control unit is connected with the output end of the operation panel control unit; the output end of the indicating lamp output processing circuit of the main control unit is connected with the input end of the operation panel control unit; the output end of the power supply transformation circuit of the main control unit is connected with the input end of the operation panel control unit; the detector has the advantages of integration of infrared ray and ultraviolet ray detection functions, wide flame spectrum detection range, high sensor detection sensitivity and strong overall anti-interference performance of the detector.

Description

Technical Field

[0001] This invention relates to the field of flame detector technology, and in particular to an integrated intelligent flame detector and detection method. Background Technology

[0002] Currently, infrared flame detectors and ultraviolet flame detectors are widely used in industrial boilers both domestically and internationally to monitor the flames of fuels such as coal, natural gas, and industrial waste gas. The conventional technology of infrared and ultraviolet flame detectors involves using infrared and ultraviolet sensors to detect the voltage and current changes caused by the infrared and ultraviolet radiation generated by the fuel flame to determine the combustion status of the flame and output a ignition signal and intensity signal.

[0003] Traditional split-type infrared and ultraviolet flame detectors have separate probes and processors, resulting in defects such as easy signal attenuation, susceptibility to interference, and short transmission distance. The control logic of traditional infrared and ultraviolet flame detectors needs further improvement, and there are problems such as missed detection, false detection, and eavesdropping. Traditional infrared and ultraviolet flame detectors cannot simultaneously perform infrared and ultraviolet spectral detection, and are not suitable for detecting combustion flames of complex industrial waste gases. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated intelligent flame detector and detection method that covers a wide spectrum detection range of infrared and ultraviolet light and is suitable for monitoring flames of various fuels, thereby solving the problems of easy signal attenuation, susceptibility to interference, and short transmission distance of traditional flame detectors.

[0005] The objective of this invention is achieved as follows: This invention includes an integrated intelligent flame detector and a detection method based on the integrated intelligent flame detector.

[0006] The integrated intelligent flame detector includes: a flame infrared signal detection circuit, a flame ultraviolet signal detection circuit, a main control unit, and an operation panel control unit; The outputs of the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit are connected to the inputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit of the main control unit, respectively; the input and outputs of the display interface circuit of the main control unit are connected to the output and inputs of the operation panel control unit; the input of the key input processing circuit of the main control unit is connected to the output of the operation panel control unit; the output of the indicator light output processing circuit of the main control unit is connected to the input of the operation panel control unit; the output of the power supply transformer circuit of the main control unit is connected to the input of the operation panel control unit. The main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals output by the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, and the operation panel control unit, respectively. After signal processing and logic operation, it outputs a fire signal, a fault signal, and a 4-20mA intensity signal, and simultaneously conducts real-time data communication with the operation panel control unit. The operation panel control unit includes: a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit; the input and output terminals of the operation panel control unit are respectively connected to the output and input terminals of the main control unit; the display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit.

[0007] The flame infrared signal detection circuit generates a voltage change signal reflecting the intensity of infrared radiation from an infrared sensor detection circuit. The stronger the infrared radiation received by the infrared sensor, the larger the voltage change signal. The voltage change signal is amplified by an operational amplifier and a logarithmic amplifier in sequence, and then outputs a voltage change signal reflecting the intensity of the detected infrared radiation. The flame infrared signal detection circuit is connected to the infrared detection signal processing circuit of the main control unit via connector J2. The flame infrared signal detection circuit sends the voltage change signal reflecting the intensity of the detected infrared radiation to the main control unit via connector J2, and the main control unit sends power to the flame infrared signal detection circuit via connector J5.

[0008] The flame ultraviolet signal detection circuit generates a current signal reflecting the intensity of ultraviolet radiation from an ultraviolet sensor detection circuit. The stronger the ultraviolet radiation received by the ultraviolet sensor, the larger the current signal. The current signal is amplified by two operational amplifiers and then output as a current signal reflecting the intensity of the detected ultraviolet radiation. The flame ultraviolet signal detection circuit is connected to the ultraviolet detection signal processing circuit of the main control unit via connector J4. The flame ultraviolet signal detection circuit sends the current signal reflecting the intensity of the detected ultraviolet radiation to the main control unit via connector J4, and the main control unit sends power to the flame ultraviolet signal detection circuit via connector J6.

[0009] The main controller of the main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit, respectively. After logical operation, it outputs fire signal, fault signal, and 4-20mA intensity signal, and communicates with the display interface circuit and RS485 communication circuit in real time. The main control unit includes: infrared detection signal processing circuit, ultraviolet detection signal processing circuit, power supply transformer circuit, main controller power supply circuit, main controller, main controller timing circuit, main controller external memory circuit, watchdog circuit, programming interface circuit, display interface circuit, key input processing circuit, indicator light output processing circuit, fire signal output circuit, fault signal output circuit, 4-20mA output circuit, external interface circuit and RS485 communication circuit; The outputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit are respectively connected to the input of the main controller; The output terminals of the power supply transformer circuit are connected to the input terminals of the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, and the RS485 communication circuit, respectively, to provide working power to each circuit. The output of the main controller power supply circuit is connected to the input of the main controller and the input of the key input processing circuit, respectively, to provide power to the two circuits; the input of the main controller power supply circuit is connected to the output of the power supply transformer circuit; the main controller power supply circuit filters the power from the power supply transformer circuit and separates the analog and numerical grounds before providing power to the main controller and the key input processing circuit.

[0010] The output of the main controller timing circuit is connected to the input of the main controller to provide timing for the main controller; The output of the external memory circuit of the main controller is connected to the input of the main controller to provide external storage space for the main controller; The output of the watchdog circuit is connected to the input of the main controller to provide watchdog control for the main controller; The output of the programming interface circuit is connected to the input of the main controller, providing the main controller with external program download and online monitoring of program operation; The input and output terminals of the display interface circuit are connected to the output and input terminals of the main controller and the operation panel control unit, respectively. The display interface circuit receives the parameter signals input by the operation panel control unit, processes them, sends them to the main controller for logical operation, and sends the result of the operation to the operation panel control unit for display. The output of the key input processing circuit is connected to the input of the main controller; the key input processing circuit receives parameter signals input from the operation panel control unit, processes them, and sends them to the main controller for logical operations; the input of the key input processing circuit is connected to the output of the operation panel control unit. The input terminal of the indicator light output processing circuit is connected to the output terminal of the main controller; the output terminal of the indicator light output processing circuit is connected to the input terminal of the operation panel control unit; the indicator light output processing circuit receives the output signal from the main controller, processes it, and sends it to the operation panel control unit for display. The input terminal of the fire signal output circuit is connected to the output terminal of the main controller. The fire signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fire signal to the outside. The input terminal of the fault signal output circuit is connected to the output terminal of the main controller unit circuit; the fault signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fault signal. The input terminal of the 4-20mA output circuit is connected to the output terminal of the main controller; the 4-20mA output circuit receives the output signal from the main controller, processes it, and then outputs a 4-20mA intensity signal. The output terminal of the external interface circuit is connected to the input terminal of the power supply transformer circuit to provide 24VDC power to the detector; the input terminal of the external interface circuit is connected to the output terminal of the fire signal output circuit, the output terminal of the fault signal output circuit, the output terminal of the 4-20mA output circuit, and the output terminal of the power supply, respectively; thus realizing the input of the working power supply and the output of fire signal, fault signal, and 4-20mA intensity signal. The input and output terminals of the RS485 communication circuit are connected to the output and input terminals of the main controller, respectively. The RS485 communication circuit receives input and output signals from the main controller, processes them, and then performs data communication with the outside world. The input and output terminals of the main controller are connected to the output and input terminals of the display interface circuit, respectively.

[0011] The power supply transformer circuit transforms the external power supply by stepping down the voltage to provide operating power for the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. It includes a 24VDC→12VDC transformer circuit, a 12VDC→5VDC transformer circuit, and a 5VDC→3VDC transformer circuit. The VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN power supplies output from the power supply transformer circuit are connected via connectors and internal wiring to the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, the RS485 communication circuit, and the power input terminal of the operation panel control unit, respectively.

[0012] The output terminal of the infrared detection signal processing circuit is connected to the input terminal of the main controller; the infrared detection signal processing circuit amplifies and filters the voltage change signal output by the flame infrared signal detection circuit and sends it to the main controller for logic operation.

[0013] The output terminal of the ultraviolet detection signal processing circuit is connected to the input terminal of the main controller; the ultraviolet detection signal processing circuit amplifies and filters the current signal output by the flame ultraviolet signal detection circuit and sends it to the main controller for logic operation.

[0014] The input terminal of the main controller power supply circuit is connected to the output terminal of the power supply transformer circuit; the main controller power supply circuit filters the power from the power supply transformer circuit and separates the analog and numerical grounds before providing working power to the main controller and key input processing circuit.

[0015] The control panel includes a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit. The input and output terminals of the display wiring circuit are connected to the output and input terminals of the display interface circuit of the main control unit, respectively; the display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit. The output terminal of the button control wiring circuit is connected to the input terminal of the button input processing circuit of the main control unit. The button control wiring circuit inputs the external setting signal to the main control unit. The indicator light display wiring circuit input terminal is connected to the output terminal of the indicator light output processing circuit of the main control unit; the indicator light display wiring circuit receives the output signal from the main control unit and displays it. The detection method based on an integrated intelligent flame detector is as follows: During operation, the main controller receives flame detection signals, parameter setting signals, and self-test signals. After logical operations, the flame signal output circuit drives the relay to activate, outputting a flame dry contact signal; the fault signal output circuit drives the relay to activate, outputting a fault dry contact signal; and the 4-20mA output circuit outputs a flame intensity signal. The RS485 communication circuit enables real-time data communication between the external system and the main controller. The specific detection steps are as follows: Step 1: The power supply for the integrated intelligent flame detector is connected to the external interface circuit of the main control unit; Step 2: The power supply transformer circuit of the main control unit reduces the external power supply to a stable power supply of VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN through step-by-step voltage reduction, providing working power for the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. Step 3: The main control unit, flame infrared signal detection circuit, flame ultraviolet signal detection circuit, and operation panel control unit begin normal operation after being powered on; Step 4: The flame infrared signal detection circuit and the flame ultraviolet signal detection circuit output the detected infrared and ultraviolet electrical signals to the main control unit, respectively; Step 5: The main control unit receives the infrared and ultraviolet electrical signals transmitted by the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit, respectively. After being amplified and processed by the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit, the signals are input to the main controller. Step 6: The main controller receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit in real time. After logic operation, it outputs fire signal, fault signal, and 4-20mA intensity signal.

[0016] Beneficial effects: Due to the adoption of the above-mentioned scheme, the infrared and ultraviolet sensors configured in this integrated intelligent flame detector can detect the ultraviolet spectrum of 220nm-350nm and the infrared spectrum of 1000nm-4600nm respectively, which is effectively applicable to the detection of flames from fuels such as coal, natural gas, and exhaust gas. Based on the characteristic peak infrared emission of flames during the combustion of fuels such as coal and the ultraviolet emission band of flames during the combustion of fuels such as natural gas, this integrated intelligent flame detector, after processing the above-mentioned detection signals, uses a pre-programmed main controller to perform feature analysis on the detection signals. Tests have verified that it can effectively output the ignition signal, fault signal, and 4-20mA intensity signal of the detected flame, reducing problems such as missed detections, false detections, and eavesdropping. Meanwhile, this integrated intelligent flame detector integrates the flame detection probe and processor together. Compared with the traditional separate flame detector, it not only saves the long signal line from the flame detection probe to the processor, but also allows the flame signal detected by the flame detection probe to be transmitted to the processor more quickly. It completely solves the problems of signal attenuation and susceptibility to interference that exist in the long-distance signal transmission of traditional separate flame detectors. The flame signal, fault signal and 4-20mA strength signal output by the integrated intelligent flame detector can be effectively transmitted over long distances through hard wiring or RS485 communication cable.

[0017] Advantages: The integrated intelligent flame detector of the present invention integrates infrared and ultraviolet detection functions, has a wide flame spectral range, high sensor detection sensitivity, and strong overall anti-interference performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2This is a schematic diagram of the detection signal input structure of the flame infrared signal detection circuit of the present invention.

[0020] Figure 3 This is a schematic diagram of the logarithmic amplifier circuit structure of the flame infrared signal detection circuit of the present invention.

[0021] Figure 4 This is a schematic diagram of the power supply and signal output structure of the flame infrared signal detection circuit of the present invention.

[0022] Figure 5 This is a schematic diagram of the detection signal amplification circuit structure of the flame ultraviolet signal detection circuit of the present invention.

[0023] Figure 6 This is a schematic diagram of the signal follower amplifier circuit structure of the flame ultraviolet signal detection circuit of the present invention.

[0024] Figure 7 This is a schematic diagram of the power supply and signal output structure of the flame ultraviolet signal detection circuit of the present invention.

[0025] Figure 8 This is a schematic diagram of the 24VDC input isolation circuit structure of the power supply transformer circuit of the present invention.

[0026] Figure 9 This is a schematic diagram of the 24VDC-5VDC transformer circuit structure of the power supply transformer circuit of the present invention.

[0027] Figure 10 This is a schematic diagram of the 5VDC-3VDC transformer circuit structure of the power supply transformer circuit of the present invention.

[0028] Figure 11 This is a schematic diagram of the infrared detection signal processing circuit structure of the present invention.

[0029] Figure 12 This is a schematic diagram of the ultraviolet detection signal processing circuit structure of the present invention.

[0030] Figure 13 This is a schematic diagram of the power supply circuit structure of the main controller of the present invention.

[0031] Figure 14 This is a schematic diagram of the wiring circuit structure of the main controller of the present invention.

[0032] Figure 15 This is a schematic diagram of the timing circuit structure of the main controller of the present invention.

[0033] Figure 16 This is a schematic diagram of the external memory circuit structure of the main controller of the present invention.

[0034] Figure 17 This is a schematic diagram of the watchdog circuit structure of the present invention.

[0035] Figure 18 This is a schematic diagram of the programming interface circuit structure of the present invention.

[0036] Figure 19 This is a schematic diagram of the display interface circuit structure of the present invention.

[0037] Figure 20 This is a schematic diagram of the key input processing circuit structure of the present invention.

[0038] Figure 21 This is a schematic diagram of the indicator light output processing circuit of the present invention.

[0039] Figure 22 This is a schematic diagram of the fire signal output circuit structure of the present invention.

[0040] Figure 23 This is a schematic diagram of the fault signal output circuit structure of the present invention.

[0041] Figure 24 This is a schematic diagram of the 4-20mA output circuit structure of the present invention.

[0042] Figure 25 This is a schematic diagram of the external interface circuit structure of the present invention.

[0043] Figure 26 This is a schematic diagram of the RS485 communication circuit structure of the present invention.

[0044] Figure 27 This is a schematic diagram of the wiring circuit structure of the display connector J9 of the present invention.

[0045] Figure 28 This is a schematic diagram of the wiring circuit structure of the display connector J10 of the present invention.

[0046] Figure 29 This is a schematic diagram of the button control wiring circuit structure of the present invention.

[0047] Figure 30 This is a schematic diagram of the indicator light display wiring circuit structure of the present invention. Detailed Implementation

[0048] Example 1: Figure 1 The integrated intelligent flame detector includes: a flame infrared signal detection circuit, a flame ultraviolet signal detection circuit, a main control unit, and an operation panel control unit; The outputs of the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit are connected to the inputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit of the main control unit, respectively; the input and outputs of the display interface circuit of the main control unit are connected to the output and inputs of the operation panel control unit; the input of the key input processing circuit of the main control unit is connected to the output of the operation panel control unit; the output of the indicator light output processing circuit of the main control unit is connected to the input of the operation panel control unit; the output of the power supply transformer circuit of the main control unit is connected to the input of the operation panel control unit. The main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals output by the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, and the operation panel control unit, respectively. After signal processing and logic operation, it outputs a fire signal, a fault signal, and a 4-20mA intensity signal, and simultaneously conducts real-time data communication with the operation panel control unit. The operation panel control unit includes: a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit; the input and output terminals of the operation panel control unit are respectively connected to the output and input terminals of the main control unit; the display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit.

[0049] Figure 2 , Figure 3 , Figure 4 In the process, the flame infrared signal detection circuit generates a voltage change signal that reflects the strength of infrared radiation by an infrared sensor detection circuit. The stronger the infrared radiation received by the infrared sensor, the larger the voltage change signal. The voltage change signal is amplified by an operational amplifier and a logarithmic amplifier in sequence, and then outputs a voltage change signal that reflects the strength of the detected infrared radiation. The flame infrared signal detection circuit is connected to the infrared detection signal processing circuit of the main control unit through connector J2. The flame infrared signal detection circuit sends the voltage change signal reflecting the strength of the detected infrared radiation to the main control unit through the second bit of connector J2, and the main control unit sends the power supply to the flame infrared signal detection circuit through the first bit of connector J5.

[0050] The flame infrared signal detection circuit includes: connector J2, diode ESD1, diode D1, diode ESD2, sensor J1, resistor R3, resistor R6, resistor R4, resistor R1, resistor R2, capacitor C1, integrated circuit U1, resistor R5, capacitor C2, capacitor C3, capacitor C5, integrated circuit U2, resistor R7, resistor R8, capacitor C4, and capacitor C6.

[0051] Diodes ESD1 and D1 are both connected to pin 3 of connector J2. The other end of diode ESD1 is grounded. The other end of diode D1 is connected to pin 3 of sensor J1, pin 5 of integrated circuit U1, capacitors C1, C2, and C3, pin 10 of integrated circuit U2, and pin 12 of integrated circuit U2. The other ends of capacitors C1, C2, and C3 are grounded. Pin 2 of integrated circuit U2 is grounded. Resistor R7, pin 11 of integrated circuit U2, and diode ESD2 are all connected to pin 2 of connector J2. The other end of resistor R7 is connected to pin 13 of integrated circuit U2 and resistor R8. The other end of resistor R8 is grounded. The other end of diode ESD2 is grounded. Pin 1 of connector J2 is grounded. Resistor R3 is connected to pin 2 and pin 4 of sensor J1. The other end of resistor R3 is grounded; resistor R6 is connected to resistor R4 and pin 1 of sensor J1, with the other end of resistor R6 grounded, and the other end of resistor R4 is connected to pin 3 of integrated circuit U1; resistor R1 is connected to resistor R2 and pin 4 of integrated circuit U1, with the other end of resistor R1 grounded, and the other end of resistor R2 is connected to pin 1 of integrated circuit U1 and resistor R5, with the other end of resistor R5 connected to pin 4 of integrated circuit U2; pin 2 of integrated circuit U1 is grounded; capacitor C5 is connected to pin 3 and pin 5 of integrated circuit U2, with the other end of capacitor C5 grounded; pin 1 of integrated circuit U2 is grounded; capacitor C4 is connected to pin 8 and pin 9 of integrated circuit U2, with the other end of capacitor C4 grounded; capacitor C6 is connected to pin 7 of integrated circuit U2, with the other end of capacitor C6 connected to pin 14 of integrated circuit U2 and ground.

[0052] The flame infrared signal detection circuit is connected to the infrared detection signal processing circuit connector J5 of the main control unit via connector J2.

[0053] Figure 5 , Figure 6 , Figure 7 In the process described, the flame ultraviolet signal detection circuit generates a current signal that reflects the intensity of ultraviolet radiation from the ultraviolet sensor detection circuit. The stronger the ultraviolet radiation received by the ultraviolet sensor, the larger the current signal. The current signal is amplified by two operational amplifiers and then output as a current signal reflecting the intensity of the detected ultraviolet radiation. The flame ultraviolet signal detection circuit is connected to the ultraviolet detection signal processing circuit of the main control unit via connector J4. The flame ultraviolet signal detection circuit sends the current signal reflecting the intensity of the detected ultraviolet radiation to the main control unit through the second pin of connector J4, and the main control unit sends power to the flame ultraviolet signal detection circuit through the first pin of connector J6.

[0054] The flame ultraviolet signal detection circuit includes: connector J4, diode ESD3, diode D2, diode ESD4, sensor J3, capacitor C7, resistor R10, capacitor C8, integrated circuit U3, resistor R12, resistor R9, resistor R11, capacitor C9, integrated circuit U4, resistor R16, resistor R17, resistor R18, resistor R19, resistor R13, resistor R14, capacitor C10, integrated circuit U5, and resistor R15.

[0055] Diodes ESD3 and D2 are connected to pin 3 of connector J4. The other end of diode ESD3 is grounded. The other end of diode D2 is connected to pin 7 of integrated circuit U3, capacitor C8, pin 7 of integrated circuit U4, capacitor C9, pin 7 of integrated circuit U5, capacitor C10, and resistor R17. The other ends of capacitors C8, C9, and C10 are grounded. The other end of resistor R17 is connected to resistors R18 and R19. The other end of resistor R19 is grounded. The other end of resistor R18 is connected to resistor R16 and pin 3 of integrated circuit U5. The other end of resistor R16 is connected to pin 6 of integrated circuit U4 and resistor R9. The other end of resistor R9 is connected to pin 2 of integrated circuit U4 and resistor R11. The other end of resistor R11 is grounded. 5. Diode ESD4 is connected to pin 2 of connector J4. The other end of diode ESD4 is grounded. The other end of resistor R15 is connected to pin 6 of integrated circuit U5. Resistor R13 is connected to resistor R14 and pin 2 of integrated circuit U5. The other end of resistor R14 is grounded. Pin 1 of connector J4 is grounded. Pin 2 of sensor J3 is grounded. Pin 1 of sensor J3 is connected to capacitor C7, resistor R10, and pin 2 of integrated circuit U3. The other end of capacitor C7 and resistor R10 are connected to resistor R12 and pin 6 of integrated circuit U3. The other end of resistor R12 is connected to pin 3 of integrated circuit U4. Pins 3 and 4 of integrated circuit U3 are grounded. Pin 4 of integrated circuit U5 is grounded. Pin 4 of integrated circuit U4 is grounded.

[0056] The flame ultraviolet signal detection circuit is connected to the ultraviolet detection signal processing circuit connector J6 of the main control unit via connector J4.

[0057] The main controller of the main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit, respectively. After logical operation, it outputs fire signal, fault signal, and 4-20mA intensity signal, and communicates with the display interface circuit and RS485 communication circuit in real time. The main control unit includes: infrared detection signal processing circuit, ultraviolet detection signal processing circuit, power supply transformer circuit, main controller power supply circuit, main controller, main controller timing circuit, main controller external memory circuit, watchdog circuit, programming interface circuit, display interface circuit, key input processing circuit, indicator light output processing circuit, fire signal output circuit, fault signal output circuit, 4-20mA output circuit, external interface circuit and RS485 communication circuit; The outputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit are respectively connected to the input of the main controller; Figure 11 In this process, the infrared detection signal processing circuit amplifies and filters the voltage change signal output by the flame infrared signal detection circuit and then sends it to the main controller for logic operations.

[0058] The infrared detection signal processing circuit includes: connector J5, capacitor C44, diode ESD18, diode ESD17, resistor R38, resistor R32, integrated circuit U7, capacitor C43, and resistor R36.

[0059] Pin 1 of connector J5 is connected to capacitor C44, diode ESD18, and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C44 and diode ESD18 are grounded. Pin 2 of connector J5 is connected to diode ESD17 and resistor R38. The other end of diode ESD17 is grounded. The other end of resistor R38 is connected to resistor R32 and pin 3 of integrated circuit U7. The other end of resistor R32 is grounded. Capacitor C43 is connected to pin 5 of integrated circuit U7 and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C43 is grounded. Resistor R36 is connected to pin 1 and pin 4 of integrated circuit U7. The other end of resistor R36 is connected to pin 20 of the main controller of the main control unit. Pin 2 of integrated circuit U7 is grounded. Pin 3 of connector J5 is grounded.

[0060] Figure 12 In the process, the ultraviolet detection signal processing circuit amplifies and filters the current signal output by the flame ultraviolet signal detection circuit and sends it to the main controller for logic operations.

[0061] The ultraviolet detection signal processing circuit includes: connector J6, capacitor C50, diode ESD20, diode ESD19, resistor R33, resistor R37, capacitor C48, integrated circuit U9, and resistor R45.

[0062] Pin 1 of connector J6 is connected to capacitor C50, diode ESD20, and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C50 and diode ESD20 are grounded. Pin 2 of connector J6 is connected to diode ESD19 and resistor R33. The other end of diode ESD19 is grounded. The other end of resistor R33 is connected to resistor R37 and pin 3 of integrated circuit U9. The other end of resistor R37 is grounded. Capacitor C48 is connected to pin 5 of integrated circuit U9 and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C48 is grounded. Resistor R45 is connected to pin 1 and pin 4 of integrated circuit U9. The other end of resistor R45 is connected to pin 21 of the main controller of the main control unit. Pin 2 of integrated circuit U9 is grounded. Pin 3 of connector J6 is grounded.

[0063] The output terminals of the power supply transformer circuit are connected to the input terminals of the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, and the RS485 communication circuit, respectively, to provide working power to each circuit. Figure 8 , Figure 9 , Figure 10 In this circuit, the power supply transformer circuit transforms the external power supply by progressively stepping down the voltage to power the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. This includes a 24VDC→12VDC transformer circuit, a 12VDC→5VDC transformer circuit, and a 5VDC→3VDC transformer circuit. The VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN power supplies output from the power supply transformer circuit are connected via connectors and internal wiring to the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, the RS485 communication circuit, and the power input terminal of the operation panel control unit, respectively.

[0064] The power supply transformer circuit includes: diode D1, diode ESD1, capacitor CP1, capacitor CP2, capacitor C1, capacitor C2, capacitor C3, capacitor C4, integrated circuit U1, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C52, capacitor C53, capacitor C54, integrated circuit U11, capacitor C55, capacitor C56, capacitor C9, capacitor C10, resistor R1, integrated circuit U2, capacitor C13, capacitor C11, capacitor C12, capacitor C14, capacitor C15, resistor R3, integrated circuit U3, capacitor C18, capacitor C16, and capacitor C17.

[0065] Diode D1 is connected to pin 1 of connector J0 in the external interface circuit, and to diode ESD1. The other end of diode ESD1 is grounded. The other end of diode D1 is connected to capacitors CP1, CP2, C1, C2, C3, C4, and pin 1 of integrated circuit U1. The other ends of capacitors CP1, CP2, C1, C2, C3, and C4 are grounded. Pin 3 of integrated circuit U1 is grounded. Pin 2 of integrated circuit U1 is connected to capacitors C5, C6, C7, C8, C52, C53, C54, and pin 3 of integrated circuit U11. The other end of capacitor C5 is grounded. The other end of capacitor C6 is grounded, the other end of capacitor C7 is grounded, the other end of capacitor C8 is grounded, the other end of capacitor C52 is grounded, the other end of capacitor C53 is grounded, and the other end of capacitor C54 is grounded; pin 1 of integrated circuit U11 is grounded; pin 4 of integrated circuit U11 is connected to pin 2 of integrated circuit U11, capacitors C55, C56, C9, and C10, resistor R1, pin 1 of integrated circuit U2, capacitors C14 and C15, resistor R3, pin 1 of integrated circuit U3, pin 1 of connector J5 of infrared detection signal processing circuit, pin 1 of connector J6 of ultraviolet detection signal processing circuit, ferrite bead FB5 of display interface circuit, pin 8 of integrated circuit U16 of RS485 communication circuit, RS4 The 85 communication circuit's resistor R74, pin 5 of integrated circuit U17 (fire signal output circuit), and pin 5 of integrated circuit U17 (fault signal output circuit) are connected. The other ends of capacitors C55, C56, C9, and C10 are grounded. The other end of resistor R1 is connected to pin 3 of integrated circuit U2. The other ends of capacitors C14 and C15 are grounded. The other end of resistor R3 is connected to pin 3 of integrated circuit U3 and pin 3 of transistor Q1 in the watchdog circuit. Pin 2 of integrated circuit U2 is grounded. Pin 5 of integrated circuit U2 is connected to capacitors C11 and C12, and the main controller power supply circuit's ferrite bead FB1 and FB2. The following circuits are connected: FB3 (ferrite bead), R14 (resistor in the external memory circuit of the main controller), pin 8 of integrated circuit U5 (internal circuit of the external memory circuit of the main controller), R27 (resistor in the watchdog circuit), D3 (diode in the programming interface circuit), R68 (resistor in the RS485 communication circuit), R69 (resistor in the RS485 communication circuit), and R71 (resistor in the RS485 communication circuit). The other end of capacitor C11 and capacitor C12 are grounded. Pin 4 of integrated circuit U2 is connected to capacitor C13, and the other end of capacitor C13 is grounded. Pin 2 of integrated circuit U3 is grounded. Pin 5 of integrated circuit U3 is connected to capacitors C16 and C17, and pin 8 of integrated circuit U6 (internal circuit of the watchdog circuit). The other end of capacitor C16 and capacitor C17 are grounded.Pin 4 of integrated circuit U3 is connected to capacitor C18, and the other end of capacitor C18 is grounded.

[0066] Figure 13 In this circuit, the output terminal of the main controller power supply circuit is connected to the input terminal of the main controller and the input terminal of the key input processing circuit, respectively, to provide working power for the two circuits; the input terminal of the main controller power supply circuit is connected to the output terminal of the power supply transformer circuit; the main controller power supply circuit filters the power from the power supply transformer circuit and separates the analog and numerical grounds before providing working power for the main controller and the key input processing circuit.

[0067] The main controller power supply circuit includes: ferrite bead FB1, capacitor C20, ferrite bead FB3, capacitor C21, ferrite bead FB4, ferrite bead FB2, capacitor C22, capacitor C23, capacitor C24, capacitor C25, and capacitor C26.

[0068] Ferrite bead FB1 is connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of FB1 is connected to capacitor C20 and pin 19 of the main controller, with the other end of capacitor C20 grounded. Ferrite bead FB3 is connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of FB3 is connected to capacitor C21 and pin 13 of the main controller, with the other end of capacitor C21 grounded. Ferrite bead FB4 is connected to pins 12 and 18 of the main controller, with the other end of FB4 grounded. Ferrite bead FB2 is connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of the ferrite bead FB2 is connected to capacitors C22, C23, C24, C25, and C26, pin 32, pin 48, and pin 64 of the main controller, as well as resistors R5, R7, R9, and R11 of the key input processing circuit. The other end of capacitors C22, C23, C24, C25, and C26 is grounded.

[0069] The output of the main controller timing circuit is connected to the input of the main controller to provide timing for the main controller; Figure 15 The main controller timing circuit includes: capacitor C28, passive crystal Y2, capacitor C31, capacitor C29, passive crystal Y1, and capacitor C30.

[0070] Capacitor C28 is connected to pin 5 of the main controller and pin 1 of the passive crystal Y2, with the other end of capacitor C28 connected to pin 4 of the passive crystal Y2 and ground; capacitor C31 is connected to pin 6 of the main controller and pin 3 of the passive crystal Y2, with the other end of capacitor C31 connected to pin 2 of the passive crystal Y2 and ground; capacitor C29 is connected to pin 3 of the main controller and pin 1 of the passive crystal Y1, with the other end of capacitor C29 grounded; capacitor C30 is connected to pin 4 of the main controller and pin 2 of the passive crystal Y1, with the other end of capacitor C30 grounded.

[0071] The output of the external memory circuit of the main controller is connected to the input of the main controller to provide external storage space for the main controller; Figure 16 The external memory circuit of the main controller includes: integrated circuit U5, resistor R14, resistor R15, and capacitor C27.

[0072] Pin 1 of integrated circuit U5 is connected to resistor R14 and pin 27 of the main controller. The other end of resistor R14 is connected to pin 5 of integrated circuit U2 of the power supply transformer circuit. Pin 2 of integrated circuit U5 is connected to pin 33 of the main controller. Pin 3 of integrated circuit U5 is connected to pin 29 of the main controller. Pin 4 of integrated circuit U5 is grounded. Pin 5 of integrated circuit U5 is connected to pin 34 of the main controller. Pin 6 of integrated circuit U5 is connected to pin 35 of the main controller. Pin 7 of integrated circuit U5 is connected to pin 28 of the main controller and resistor R15. The other end of resistor R15 is connected to capacitor C27, pin 8 of integrated circuit U5, and pin 5 of integrated circuit U2 of the power supply transformer circuit. The other end of capacitor C27 is grounded.

[0073] The output of the watchdog circuit is connected to the input of the main controller to provide watchdog control for the main controller; Figure 17 The watchdog circuit mentioned above includes: integrated circuit U6, resistor R25, capacitor C34, resistor R24, transistor Q1, resistor R26, resistor R29, resistor R34, resistor R35, resistor R27, resistor R30, and capacitor C41.

[0074] Pin 1 of integrated circuit U6 is connected to pin 37 of the main controller; pin 2 of integrated circuit U6 is grounded; pin 4 of integrated circuit U6 is connected to resistor R25, with the other end of resistor R25 grounded; pin 5 of integrated circuit U6 is connected to pin 6 of transistor Q1, resistor R24, and pin 6 of integrated circuit U6, with the other end of resistor R24 ​​connected to pin 8 of integrated circuit U6 and capacitor C34, with the other end of capacitor C34 grounded; pin 7 of integrated circuit U6 is connected to resistor R30, with the other end of resistor R30 connected to pin 7 of the main controller, resistor R27, and capacitor C41, with resistor R... 27 is connected to pin 5 of integrated circuit U2 of the power supply transformer circuit, and the other end of capacitor C41 is grounded; pin 2 of transistor Q1 is connected to resistors R26 and R29, the other end of resistor R26 is connected to pin 36 of the main controller, and the other end of resistor R29 is grounded; pin 3 of transistor Q1 is connected to pin 3 of integrated circuit U3 of the power supply transformer circuit; pin 5 of transistor Q1 is connected to resistors R34 and R35, the other end of resistor R34 is pin 1 of connector J8 of the programming interface circuit, and the other end of resistor R35 is grounded; pin 4 of transistor Q1 is grounded.

[0075] The output of the programming interface circuit is connected to the input of the main controller, providing the main controller with external program download and online monitoring of program operation; Figure 18 The programming interface circuit mentioned above includes: connector J8, diode D3, diode ESD9, resistor R12, resistor R13, and diode ESD10.

[0076] Pin 1 of connector J8 is connected to diode D3 and resistor R34 of the watchdog circuit. The other end of diode D3 is connected to pin 5 of integrated circuit U2 of the power supply transformer circuit. Pin 2 of connector J8 is connected to diode ESD9 and resistor R12. The other end of diode ESD9 is grounded, and the other end of resistor R12 is connected to pin 49 of the main controller. Pin 3 of connector J8 is connected to diode ESD10 and resistor R13. The other end of diode ESD10 is grounded, and the other end of resistor R13 is connected to pin 46 of the main controller. Pin 4 of connector J8 is grounded.

[0077] The input and output terminals of the display interface circuit are connected to the output and input terminals of the main controller and the operation panel control unit, respectively. The display interface circuit receives the parameter signals input by the operation panel control unit, processes them, sends them to the main controller for logical operation, and sends the result of the operation to the operation panel control unit for display. Figure 19The display interface circuit mentioned above includes: diodes ESD11, ESD12, ESD13, ESD14, ESD15, and ESD16; resistors R19, R20, R21, R22, and R23; ferrite bead FB5; capacitors C35 and C36; and connector J7.

[0078] Pin 1 of connector J7 is connected to pin 2 of connector J7, diode ESD11, ferrite bead FB5, capacitor C35, and capacitor C36. The other end of diode ESD11 is grounded, the other end of ferrite bead FB5 is connected to pin 4 of integrated circuit U11 in the power supply transformer circuit, the other end of capacitor C35 is grounded, and the other end of capacitor C36 is grounded. Pin 3 of connector J7 is grounded. Pin 4 of connector J7 is connected to diode ESD15 and resistor R22. The other end of diode ESD15 is grounded, and the other end of resistor R22 is connected to pin 51 of the main controller. Pin 5 of connector J7 is connected to diode ESD16 and resistor R23. The other end of diode ESD16 is grounded, and the other end of resistor R23 is connected to pin 52 of the main controller. Pin 6 of connector J7 is connected to diode ESD12 and resistor R19. The other end of diode ESD12 is grounded, and the other end of resistor R19 is connected to pin 55 of the main controller. Pin 7 of connector J7 is connected to... Diode ESD13 and resistor R21 are connected together, with the other end of diode ESD13 grounded and the other end of resistor R21 connected to pin 54 of the main controller; pin 8 of connector J7 is connected to diode ESD14 and resistor R20, with the other end of diode ESD14 grounded and the other end of resistor R20 connected to pin 53 of the main controller; pin 9 of connector J7 is grounded; pin 10 of connector J7 is connected to resistor R8 of the key input processing circuit; pin 11 of connector J7 is connected to resistor R10 of the key input processing circuit; pin 12 of connector J7 is connected to resistor R6 of the key input processing circuit; pin 13 of connector J7 is connected to resistor R4 of the key input processing circuit; pin 14 of connector J7 is connected to resistor R16 of the indicator light output processing circuit; pin 15 of connector J7 is connected to resistor R17 of the indicator light output processing circuit; pin 16 of connector J7 is connected to resistor R18 of the indicator light output processing circuit.

[0079] The output of the key input processing circuit is connected to the input of the main controller; the key input processing circuit receives parameter signals input from the operation panel control unit, processes them, and sends them to the main controller for logical operations; the input of the key input processing circuit is connected to the output of the operation panel control unit. Figure 20The key input processing circuit includes: resistors R51, R50, R4, R5, diode ESD5, R6, R7, diode ESD6, R8, R9, diode ESD7, R10, R11, diode ESD8, resistor R31, optocoupler D6, and resistor R28.

[0080] Resistor R51 is connected to pin 60 of the main controller and resistor R50. The other end of resistor R51 is grounded. The other end of resistor R50 is connected to the ferrite bead FB2 of the main controller's power supply circuit. Resistor R4 is connected to pin 41 of the main controller. The other end of resistor R4 is connected to pin 13 of connector J7 of the display interface circuit, resistor R5, and diode ESD5. The other end of resistor R5 is connected to the ferrite bead FB2 of the main controller's power supply circuit. The other end of diode ESD5 is grounded. Resistor R6 is connected to pin 59 of the main controller. The other end of resistor R6 is connected to pin 12 of connector J7 of the display interface circuit, resistor R7, and diode ESD6. The other end of resistor R7 is connected to the main controller's power supply circuit. The other end of the ferrite bead FB2 and diode ESD6 in the controller power supply circuit is grounded; resistor R8 is connected to pin 62 of the main controller, and the other end of resistor R8 is connected to pin 10 of connector J7 of the display interface circuit, resistor R9, and diode ESD7. The other end of resistor R9 is connected to the ferrite bead FB2 in the main controller power supply circuit, and the other end of diode ESD7 is grounded; resistor R10 is connected to pin 61 of the main controller, and the other end of resistor R10 is connected to pin 11 of connector J7 of the display interface circuit, resistor R11, and diode ESD8. The other end of resistor R11 is connected to the ferrite bead FB2 in the main controller power supply circuit, and the other end of diode ESD8 is grounded.

[0081] The input terminal of the indicator light output processing circuit is connected to the output terminal of the main controller; the output terminal of the indicator light output processing circuit is connected to the input terminal of the operation panel control unit; the indicator light output processing circuit receives the output signal from the main controller, processes it, and sends it to the operation panel control unit for display. Figure 21 The indicator light output processing circuit includes: resistor R16, diode ESD25, resistor R17, diode ESD24, resistor R18, and diode ESD23. Resistor R16 is connected to pin 56 of the main controller. The other end of resistor R16 is connected to pin 14 of connector J7 of the display interface circuit and diode ESD25. The other end of diode ESD25 is grounded. Resistor R17 is connected to pin 57 of the main controller. The other end of resistor R17 is connected to pin 15 of connector J7 of the display interface circuit and diode ESD24. The other end of diode ESD24 is grounded. Resistor R18 is connected to pin 58 of the main controller. The other end of resistor R18 is connected to pin 16 of connector J7 of the display interface circuit and diode ESD23. The other end of diode ESD23 is grounded.

[0082] The input terminal of the fire signal output circuit is connected to the output terminal of the main controller. The fire signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fire signal to the outside. Figure 22 The fire signal output circuit mentioned above includes: integrated circuit U17, capacitor C64, resistor R75, resistor R76, and relay J8.

[0083] Capacitor C64 is connected to pin 5 of integrated circuit U17 and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C64 is grounded. Resistor R75 is connected to pin 3 of integrated circuit U17, and the other end of resistor R75 is connected to pin 8 of the main controller. Resistor R76 is connected to pin 6 of integrated circuit U17, and the other end of resistor R75 is connected to pin 9 of the main controller. Pin 2 of integrated circuit U17 is grounded. Pin 1 of integrated circuit U17 is connected to pin 1 of relay J8. Pin 4 of integrated circuit U17 is connected to pin 8 of relay J8. Pins 2 and 3 of relay J8 output a set of passive dry contact no-fire signals, pins 3 and 4 of relay J8 output a set of passive dry contact fire signals, pins 7 and 6 of relay J8 output a set of passive dry contact no-fire signals, and pins 6 and 5 of relay J8 output a set of passive dry contact fire signals.

[0084] The input terminal of the fault signal output circuit is connected to the output terminal of the main controller unit circuit; the fault signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fault signal. Figure 23 The fault signal output circuit mentioned above includes: integrated circuit U18, capacitor C65, resistor R77, resistor R78, and relay J9.

[0085] Capacitor C65 is connected to pin 5 of integrated circuit U18 and pin 4 of integrated circuit U11 in the power supply transformer circuit. The other end of capacitor C65 is grounded. Resistor R77 is connected to pin 3 of integrated circuit U18, and the other end of resistor R77 is connected to pin 1 of the main controller. Resistor R78 is connected to pin 6 of integrated circuit U18, and the other end of resistor R78 is connected to pin 2 of the main controller. Pin 2 of integrated circuit U18 is grounded. Pin 1 of integrated circuit U18 is connected to pin 1 of relay J9. Pin 4 of integrated circuit U18 is connected to pin 8 of relay J9. Pins 2 and 3 of relay J9 output a set of passive dry contact fault signals. Pins 3 and 4 of relay J9 output a set of passive dry contact no-fault signals. Pins 7 and 6 of relay J9 output a set of passive dry contact fault signals. Pins 6 and 5 of relay J8 output a set of passive dry contact no-fault signals.

[0086] The input terminal of the 4-20mA output circuit is connected to the output terminal of the main controller; the 4-20mA output circuit receives the output signal from the main controller, processes it, and then outputs a 4-20mA intensity signal. Figure 24 The 4-20A output circuit mentioned above includes: diode D4, resistor R62, optocoupler D5, resistor R61, capacitor C59, integrated circuit U13, capacitor C57, resistor R60, capacitor C58, integrated circuit U14, capacitor C60, capacitor CP3, resistor R63, resistor R64, and resistor R65.

[0087] Diode D4 is connected to diode D1 in the power supply transformer circuit. The other end of diode D4 is connected to pin 4 of integrated circuit U13, capacitor C59, pin 5 of integrated circuit U14, and capacitor C58. The other end of capacitor C59 and capacitor C58 are grounded. Resistor R62 is connected to pin 14 of the main controller. The other end of resistor R62 is connected to pin 1 of optocoupler D5. Pin 2 of optocoupler D5 is grounded. Pin 4 of optocoupler D5 is connected to resistor R61 and pin 3 of integrated circuit U13. The other end of resistor R61 is connected to pin 8 of integrated circuit U13 and capacitor C57. The other end of capacitor C57 is grounded. Pin 3 of optocoupler D5 is grounded. Pin 7 of integrated circuit U13 is connected to resistor R60. The other end of resistor R60 is connected to pin 5 of integrated circuit U13, pin 9 of integrated circuit U13, capacitor C60, capacitor CP3, resistor R63, pin 1 of integrated circuit U14, and ground. The other ends of capacitor C60, capacitor CP3, and resistor R63 are all connected to pin 10 of connector J0 of the external interface circuit, resistor R64, and the other end of resistor R64 is connected to pin 3 of integrated circuit U14. Resistor R65 is connected to pin 6 of integrated circuit U13 and pin 4 of integrated circuit U14. Pin 2 of integrated circuit U14 is grounded.

[0088] The output terminal of the external interface circuit is connected to the input terminal of the power supply transformer circuit to provide 24VDC power to the detector; the input terminal of the external interface circuit is connected to the output terminal of the fire signal output circuit, the output terminal of the fault signal output circuit, the output terminal of the 4-20mA output circuit, and the output terminal of the power supply, respectively; thus realizing the input of the working power supply and the output of fire signal, fault signal, and 4-20mA intensity signal. Figure 25 The external interface circuit mentioned above includes: connector J0, diode ESD2, diode ESD3, and diode ESD4.

[0089] Connector J0, pin 1 connects to the external 24VDC power supply; pin 2 connects to ground; pin 3 connects to pin 6 of relay J9 in the fault output circuit; pin 4 connects to pin 5 of relay J9 in the fault output circuit; pin 5 connects to pin 6 of relay J8 in the fire output circuit; pin 6 connects to pin 5 of relay J8 in the fire output circuit; pin 7 connects to resistor R31 in the key input processing circuit; pin 8 connects to ground; pin 9 connects to diode ESD2 and ground, with the other end of diode ESD2 connected to capacitor C60 in the 4-20A output circuit and pin 10 of connector J0; pin 11 connects to resistor R74 and diode ESD3 in the RS485 communication circuit, with the other end of diode ESD3 connected to ground; pin 12 connects to resistor R70 and diode ESD4 in the RS485 communication circuit, with the other end of diode ESD4 connected to ground.

[0090] The input and output terminals of the RS485 communication circuit are connected to the output and input terminals of the main controller, respectively. The RS485 communication circuit receives input and output signals from the main controller, processes them, and then performs data communication with the outside world. Figure 26 The RS485 communication circuit mentioned above includes: resistor R69, resistor R68, capacitor C62, transistor Q2, resistor R71, resistor R73, integrated circuit U16, capacitor C63, resistor R70, resistor R72, and resistor R74.

[0091] Resistor R69 is connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of resistor R69 is connected to pin 16 of the main controller and pin 6 of transistor Q2. Resistor R68 is connected in parallel with capacitor C62 and then connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of resistor R68 is connected to pin 2 of transistor Q2. Resistor R71 is connected to pin 5 of integrated circuit U2 in the power supply transformer circuit. The other end of resistor R71 is connected to pin 2 of integrated circuit U16, pin 3 of integrated circuit U16, and pin 3 of transistor Q2. Resistor R73 is connected to pin 15 of the main controller. The other end of resistor R73 is connected to pin 5 of transistor Q2. Transistor Q... Pin 4 of IC 2 is grounded; pin 4 of IC U16 is grounded; pin 8 of IC U16 is connected to pin 4 of IC U11 in the power supply transformer circuit and capacitor C63, with the other end of capacitor C63 grounded; pin 7 of IC U16 is connected to resistor R70, pin 12 of connector J0 in the external interface circuit, and resistor R72, with the other end of resistor R70 grounded; the other end of resistor R72 is connected to pin 11 of connector J0 in the external interface circuit, pin 6 of IC U16, and resistor R74, with the other end of resistor R74 connected to pin 4 of IC U11 in the power supply transformer circuit; pin 5 of IC U16 is grounded.

[0092] The main controller receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit, respectively. After logical operation, it outputs fire signal, fault signal, and 4-20mA intensity signal, and communicates with the display interface circuit and RS485 communication circuit in real time. Figure 14 The main controller U0 mentioned above is model number HC32F460JETA-LQFP64.

[0093] Pin 1 of the main controller U0 is connected to resistor R77 of the fault signal output circuit; pin 2 of the main controller U0 is connected to resistor R78 of the fault signal output circuit; pin 3 of the main controller U0 is connected to pin 1 of the passive crystal oscillator Y1 of the main controller timing circuit; pin 4 of the main controller U0 is connected to pin 2 of the passive crystal oscillator Y1 of the main controller timing circuit; pin 5 of the main controller U0 is connected to pin 1 of the passive crystal oscillator Y2 of the main controller timing circuit; pin 6 of the main controller U0 is connected to pin 3 of the passive crystal oscillator Y2 of the main controller timing circuit; pin 7 of the main controller U0 is connected to the junction of resistor R77, capacitor C41, and resistor R30 of the watchdog circuit; pin 8 of the main controller U0 is connected to resistor R75 of the fire signal output circuit; pin 9 of the main controller U0 is connected to the fire signal output circuit. The circuit's resistor R76; pin 10 of the main controller U0 is connected to pin 4 of the optocoupler D6 in the key input processing circuit; pin 14 of the main controller U0 is connected to resistor R62 in the 4-20mA output circuit; pin 15 of the main controller U0 is connected to resistor R73 in the RS485 communication circuit; pin 16 of the main controller U0 is connected to resistor R69 in the RS485 communication circuit and pin 6 of transistor Q2; pin 20 of the main controller U0 is connected to resistor R36 in the infrared detection signal processing circuit; pin 21 of the main controller U0 is connected to resistor R45 in the ultraviolet detection signal processing circuit; pin 27 of the main controller U0 is connected to pin 1 of integrated circuit U5 in the main controller's external memory circuit; pin 28 of the main controller U0 is connected to integrated circuit U5 in the main controller's external memory circuit. Pin 7 of U5; Pin 29 of main controller U0 is connected to pin 3 of integrated circuit U5 of the main controller's external memory circuit; Pin 33 of main controller U0 is connected to pin 2 of integrated circuit U5 of the main controller's external memory circuit; Pin 30 of main controller U0 is connected to capacitor C19, with the other end of capacitor C19 grounded; Pin 34 of main controller U0 is connected to pin 5 of integrated circuit U5 of the main controller's external memory circuit; Pin 35 of main controller U0 is connected to pin 6 of integrated circuit U5 of the main controller's external memory circuit; Pin 36 of main controller U0 is connected to resistor R26 of the watchdog circuit; Pin 37 of main controller U0 is connected to pin 1 of integrated circuit U6 of the watchdog circuit; Pin 41 of main controller U0 is connected to resistor R4 of the key input processing circuit; Pin 46 of the main controller U0 is connected to resistor R13 of the programming interface circuit; pin 49 of the main controller U0 is connected to resistor R12 of the programming interface circuit; pin 51 of the main controller U0 is connected to resistor R22 of the display interface circuit; pin 52 of the main controller U0 is connected to resistor R23 of the display interface circuit; pin 53 of the main controller U0 is connected to resistor R20 of the display interface circuit; pin 54 of the main controller U0 is connected to resistor R21 of the display interface circuit; pin 55 of the main controller U0 is connected to resistor R19 of the display interface circuit; pin 56 of the main controller U0 is connected to resistor R16 of the indicator light output processing circuit; pin 57 of the main controller U0 is connected to resistor R17 of the indicator light output processing circuit; pin 58 of the main controller U0 is connected to resistor R18 of the indicator light output processing circuit.Pin 59 of the main controller U0 is connected to resistor R6 of the key input processing circuit; pin 60 of the main controller U0 is connected to the junction of resistors R50 and R51 of the key input processing circuit; pin 61 of the main controller U0 is connected to resistor R10 of the key input processing circuit; pin 62 of the main controller U0 is connected to resistor R8 of the key input processing circuit; pin 13 of the main controller U0 is connected to the junction of ferrite bead FB3 and capacitor C21 of the main controller power supply circuit; pin 19 of the main controller U0 is connected to the junction of ferrite bead FB1 and capacitor C20 of the main controller power supply circuit; pin 32 of the main controller U0 is connected to pins 48 and 64 of the main controller U0 and ferrite bead FB2 of the main controller power supply circuit; pin 12 of the main controller U0 is connected to pin 18 of the main controller U0 and ferrite bead FB4 of the main controller power supply circuit; pin 31 of the main controller U0 is connected to pin 47 of the main controller U0, pin 63 of the main controller U0-4B, and ground.

[0094] The input and output terminals of the main controller are connected to the output and input terminals of the display interface circuit, respectively.

[0095] The operation panel control unit inputs external setting signals to the main control unit and displays the output signals of the main control unit; the operation panel control unit includes a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit.

[0096] Figure 27 , Figure 28 In this circuit, the input and output terminals of the display wiring circuit are connected to the output and input terminals of the display interface circuit of the main control unit, respectively; the display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit; including: connector J9 and connector J10.

[0097] Pin 1 of connector J9 is connected to pin 1 of connector J7 and pin 2 of connector J9 in the display interface circuit; pin 3 of connector J9 is grounded; pins 4-8 of connector J9 are respectively connected to pins 4-8 of connector J7 in the display interface circuit; pin 9 of connector J9 is grounded; pins 10-16 of connector J9 are respectively connected to pins 10-16 of connector J7 in the display interface circuit; pins 17-18 of connector J9 are grounded; pin 1 of connector J10 is grounded; pin 2 of connector J10 is connected to pin 1 of connector J7 in the display interface circuit; pins 3-7 of connector J10 are respectively connected to pins 4-8 of connector J9.

[0098] Figure 29 In this circuit, the output terminal of the button control wiring circuit is connected to the input terminal of the button input processing circuit of the main control unit. The button control wiring circuit inputs external setting signals to the main control unit; including: button K1, button K2, button K3, and button K4.

[0099] Shorting pins 1 and 2 of button K1 connects to pin 10 of connector J9 in the monitor wiring circuit; shorting pins 3 and 4 of button K1 connects to ground. Shorting pins 1 and 2 of button K2 connects to pin 11 of connector J9 in the monitor wiring circuit; shorting pins 3 and 4 of button K2 connects to ground. Shorting pins 1 and 2 of button K3 connects to pin 12 of connector J9 in the monitor wiring circuit; shorting pins 3 and 4 of button K3 connects to ground. Shorting pins 1 and 2 of button K4 connects to pin 13 of connector J9 in the monitor wiring circuit; shorting pins 3 and 4 of button K4 connects to ground.

[0100] Figure 30 In this circuit, the input terminal of the indicator light display wiring circuit is connected to the output terminal of the indicator light output processing circuit of the main control unit; the indicator light display wiring circuit receives output signals from the main control unit for display. It includes: indicator light LED1, indicator light LED2, and indicator light LED3.

[0101] Indicator LED1, Indicator LED2, and Indicator LED3 are all connected to pin 1 of connector J9 in the display wiring circuit. The other end of Indicator LED1 is connected to pin 14 of connector J9 in the display wiring circuit, the other end of Indicator LED2 is connected to pin 15 of connector J9 in the display wiring circuit, and the other end of Indicator LED3 is connected to pin 16 of connector J9 in the display wiring circuit.

[0102] The detection method based on an integrated intelligent flame detector is as follows: During operation, the main controller receives flame detection signals, parameter setting signals, and self-test signals. After logical operations, the flame signal output circuit drives the relay to activate, outputting a flame dry contact signal; the fault signal output circuit drives the relay to activate, outputting a fault dry contact signal; and the 4-20mA output circuit outputs a flame intensity signal. The RS485 communication circuit enables real-time data communication between the external system and the main controller. The specific detection steps are as follows: Step 1: The power supply for the integrated intelligent flame detector is connected to the external interface circuit of the main control unit; Step 2: The power supply transformer circuit of the main control unit reduces the external power supply to a stable power supply of VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN through step-by-step voltage reduction, providing working power for the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. Step 3: The main control unit, flame infrared signal detection circuit, flame ultraviolet signal detection circuit, and operation panel control unit begin normal operation after being powered on; Step 4: The flame infrared signal detection circuit and the flame ultraviolet signal detection circuit output the detected infrared and ultraviolet electrical signals to the main control unit, respectively; Step 5: The main control unit receives the infrared and ultraviolet electrical signals transmitted by the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit, respectively. After being amplified and processed by the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit, the signals are input to the main controller. Step 6: The main controller receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit in real time. After logic operation, it outputs fire signal, fault signal, and 4-20mA intensity signal.

Claims

1. An integrated intelligent flame detector, characterized in that: include: Flame infrared signal detection circuit, flame ultraviolet signal detection circuit, main control unit and operation panel control unit; The outputs of the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit are connected to the inputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit of the main control unit, respectively; the input and outputs of the display interface circuit of the main control unit are connected to the output and inputs of the operation panel control unit; the input of the key input processing circuit of the main control unit is connected to the output of the operation panel control unit; the output of the indicator light output processing circuit of the main control unit is connected to the input of the operation panel control unit; the output of the power supply transformer circuit of the main control unit is connected to the input of the operation panel control unit. The main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals output by the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, and the operation panel control unit, respectively. After signal processing and logic operation, it outputs a fire signal, a fault signal, and a 4-20mA intensity signal, and simultaneously conducts real-time data communication with the operation panel control unit. The operation panel control unit includes: a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit; the input and output terminals of the operation panel control unit are respectively connected to the output and input terminals of the main control unit. The display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit.

2. The integrated intelligent flame detector according to claim 1, characterized in that: The flame infrared signal detection circuit generates a voltage change signal reflecting the intensity of infrared radiation from an infrared sensor detection circuit. The stronger the infrared radiation received by the infrared sensor, the larger the voltage change signal. The voltage change signal is amplified by an operational amplifier and a logarithmic amplifier in sequence, and then outputs a voltage change signal reflecting the intensity of the detected infrared radiation. The flame infrared signal detection circuit is connected to the infrared detection signal processing circuit of the main control unit via connector J2. The flame infrared signal detection circuit sends the voltage change signal reflecting the intensity of the detected infrared radiation to the main control unit via connector J2, and the main control unit sends power to the flame infrared signal detection circuit via connector J5.

3. The integrated intelligent flame detector according to claim 1, characterized in that: The flame ultraviolet signal detection circuit generates a current signal reflecting the intensity of ultraviolet radiation from an ultraviolet sensor detection circuit. The stronger the ultraviolet radiation received by the ultraviolet sensor, the larger the current signal. The current signal is amplified by two operational amplifiers and then output as a current signal reflecting the intensity of the detected ultraviolet radiation. The flame ultraviolet signal detection circuit is connected to the ultraviolet detection signal processing circuit of the main control unit via connector J4. The flame ultraviolet signal detection circuit sends the current signal reflecting the intensity of the detected ultraviolet radiation to the main control unit via connector J4, and the main control unit sends power to the flame ultraviolet signal detection circuit via connector J6.

4. The integrated intelligent flame detector according to claim 1, characterized in that: The main controller of the main control unit receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit, respectively. After logical operation, it outputs fire signal, fault signal, and 4-20mA intensity signal, and communicates with the display interface circuit and RS485 communication circuit in real time. The main control unit includes: infrared detection signal processing circuit, ultraviolet detection signal processing circuit, power supply transformer circuit, main controller power supply circuit, main controller, main controller timing circuit, main controller external memory circuit, watchdog circuit, programming interface circuit, display interface circuit, key input processing circuit, indicator light output processing circuit, fire signal output circuit, fault signal output circuit, 4-20mA output circuit, external interface circuit and RS485 communication circuit; The outputs of the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit are respectively connected to the input of the main controller; The output terminals of the power supply transformer circuit are connected to the input terminals of the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, and the RS485 communication circuit, respectively, to provide working power to each circuit. The output of the main controller power supply circuit is connected to the input of the main controller and the input of the key input processing circuit, respectively, to provide power to the two circuits; the input of the main controller power supply circuit is connected to the output of the power supply transformer circuit; the main controller power supply circuit filters the power from the power supply transformer circuit and separates the analog and numerical grounds before providing power to the main controller and the key input processing circuit. The output of the main controller timing circuit is connected to the input of the main controller to provide timing for the main controller; The output of the external memory circuit of the main controller is connected to the input of the main controller to provide external storage space for the main controller; The output of the watchdog circuit is connected to the input of the main controller to provide watchdog control for the main controller; The output of the programming interface circuit is connected to the input of the main controller, providing the main controller with external program download and online monitoring of program operation; The input and output terminals of the display interface circuit are connected to the output and input terminals of the main controller and the operation panel control unit, respectively. The display interface circuit receives the parameter signals input by the operation panel control unit, processes them, sends them to the main controller for logical operation, and sends the result of the operation to the operation panel control unit for display. The output of the key input processing circuit is connected to the input of the main controller; the key input processing circuit receives parameter signals input from the operation panel control unit, processes them, and sends them to the main controller for logical operations; the input of the key input processing circuit is connected to the output of the operation panel control unit. The input terminal of the indicator light output processing circuit is connected to the output terminal of the main controller; the output terminal of the indicator light output processing circuit is connected to the input terminal of the operation panel control unit; the indicator light output processing circuit receives the output signal from the main controller, processes it, and sends it to the operation panel control unit for display. The input terminal of the fire signal output circuit is connected to the output terminal of the main controller. The fire signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fire signal to the outside. The input terminal of the fault signal output circuit is connected to the output terminal of the main controller unit circuit; the fault signal output circuit receives the output signal from the main controller, processes it, and then outputs a dry contact fault signal. The input terminal of the 4-20mA output circuit is connected to the output terminal of the main controller; the 4-20mA output circuit receives the output signal from the main controller, processes it, and then outputs a 4-20mA intensity signal. The output terminal of the external interface circuit is connected to the input terminal of the power supply transformer circuit to provide 24VDC power to the detector; the input terminal of the external interface circuit is connected to the output terminal of the fire signal output circuit, the output terminal of the fault signal output circuit, the output terminal of the 4-20mA output circuit, and the output terminal of the power supply, respectively; thus realizing the input of the working power supply and the output of fire signal, fault signal, and 4-20mA intensity signal. The input and output terminals of the RS485 communication circuit are connected to the output and input terminals of the main controller, respectively. The RS485 communication circuit receives input and output signals from the main controller, processes them, and then performs data communication with the outside world. The input and output terminals of the main controller are connected to the output and input terminals of the display interface circuit, respectively.

5. The integrated intelligent flame detector according to claim 4, characterized in that: The power supply transformer circuit transforms the external power supply by stepping down the voltage to provide operating power for the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. It includes a 24VDC→12VDC transformer circuit, a 12VDC→5VDC transformer circuit, and a 5VDC→3VDC transformer circuit. The VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN power supplies output from the power supply transformer circuit are connected via connectors and internal wiring to the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main controller power supply circuit, the main controller external memory circuit, the watchdog circuit, the programming interface circuit, the display interface circuit, the fire signal output circuit, the fault signal output circuit, the 4-20mA output circuit, the RS485 communication circuit, and the power input terminal of the operation panel control unit, respectively.

6. The integrated intelligent flame detector according to claim 4, characterized in that: The output terminal of the infrared detection signal processing circuit is connected to the input terminal of the main controller; the infrared detection signal processing circuit amplifies and filters the voltage change signal output by the flame infrared signal detection circuit and sends it to the main controller for logic operation.

7. An integrated intelligent flame detector according to claim 4, characterized in that: The output of the ultraviolet detection signal processing circuit is connected to the input of the main controller; the ultraviolet detection signal processing circuit amplifies and filters the current signal output by the flame ultraviolet signal detection circuit and sends it to the main controller for logic operation.

8. The integrated intelligent flame detector according to claim 4, characterized in that: The input terminal of the main controller power supply circuit is connected to the output terminal of the power supply transformer circuit; the main controller power supply circuit filters the power from the power supply transformer circuit and separates the analog and numerical grounds before providing working power to the main controller and key input processing circuit.

9. The integrated intelligent flame detector according to claim 1, characterized in that: The control panel includes a display wiring circuit, a button control wiring circuit, and an indicator light display wiring circuit. The input and output terminals of the display wiring circuit are connected to the output and input terminals of the display interface circuit of the main control unit, respectively; the display wiring circuit inputs external setting signals to the main control unit and displays the output signals of the main control unit. The output terminal of the button control wiring circuit is connected to the input terminal of the button input processing circuit of the main control unit; the button control wiring circuit inputs external setting signals to the main control unit. The indicator light display wiring circuit input terminal is connected to the output terminal of the indicator light output processing circuit of the main control unit; the indicator light display wiring circuit receives the output signal from the main control unit for display.

10. A detection method based on the integrated intelligent flame detector according to claim 1, characterized in that: During operation, the main controller receives flame detection signals, parameter setting signals, and self-test signals. After logical operations, the flame signal output circuit drives the relay to activate, outputting a flame dry contact signal; the fault signal output circuit drives the relay to activate, outputting a fault dry contact signal; the 4-20mA output circuit outputs a flame intensity signal; the RS485 communication circuit enables real-time data communication between the external system and the main controller; the specific detection steps are as follows: Step 1: The power supply for the integrated intelligent flame detector is connected to the external interface circuit of the main control unit; Step 2: The power supply transformer circuit of the main control unit reduces the external power supply to a stable power supply of VCC_5V, VCC_3V3, VCC_3V3_WDG, and VCC_24V_IN through step-by-step voltage reduction, providing working power for the flame infrared signal detection circuit, the flame ultraviolet signal detection circuit, the main control unit, and the operation panel control unit. Step 3: The main control unit, flame infrared signal detection circuit, flame ultraviolet signal detection circuit, and operation panel control unit begin normal operation after being powered on; Step 4: The flame infrared signal detection circuit and the flame ultraviolet signal detection circuit output the detected infrared and ultraviolet electrical signals to the main control unit, respectively; Step 5: The main control unit receives the infrared and ultraviolet electrical signals transmitted by the flame infrared signal detection circuit and the flame ultraviolet signal detection circuit, respectively. After being amplified and processed by the infrared detection signal processing circuit and the ultraviolet detection signal processing circuit, the signals are input to the main controller. Step 6: The main controller receives infrared voltage change signals, ultraviolet current signals, and parameter setting signals from the infrared detection signal processing circuit, ultraviolet detection signal processing circuit, display interface circuit, key input processing circuit, and RS485 communication circuit in real time. After logic operation, it outputs fire signal, fault signal, and 4-20mA intensity signal.

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