Toxic gas detector control circuit capable of resisting electromagnetic interference

Abstract

The utility model provides a toxic gas detector control circuit capable of resisting electromagnetic interference, which comprises a power supply voltage regulation circuit, a temperature signal acquisition circuit, a sensor voltage regulation circuit, a sensor acquisition control circuit and a gas detector main control circuit which are in power supply connection. The gas detector main control circuit is in control connection with the 485 communication circuit, the acousto-optic prompt circuit, the LED state display circuit and the digital display screen, the gas detector main control circuit is in communication connection with the sensor acquisition control circuit, and the sensor acquisition control circuit is in control connection with the gas signal acquisition circuit and the temperature signal acquisition circuit. A TVS (Transient Voltage Suppressor) tube, a common mode inductor and a diode are arranged in the power supply voltage adjusting circuit; and a TVS tube and a diode are also arranged in the gas detector main control circuit. The poisonous gas detector has the beneficial effects that the anti-electromagnetic interference capability, the reliability and the stability of the poisonous gas detector when the poisonous gas detector is independently used are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of toxic gas detector control circuit capable of resisting electromagnetic interference, and specifically relates to the technical field of gas detection. BACKGROUND

[0002] The gas detector is an instrument for detecting gas concentration. The gas detector is suitable for dangerous places where flammable gas or toxic gas exists, and can continuously monitor the content of the measured gas in the air within the lower explosive limit. It can be widely used in industries such as gas, petrochemical, metallurgy, steel, coking, and power where flammable gas or toxic gas exists. It is an important detection instrument for ensuring property and personal safety. The gas detector uses catalytic combustion type and electrochemical type gas sensor as detection element, which requires high sensitivity and rapid response time. It is generally made of aluminum die-casting one-piece shell and has certain explosion-proof grade requirements. According to the type of detected gas, it can be divided into flammable gas detector and toxic gas detector. The toxic gas detector can detect toxic gases such as carbon monoxide, hydrogen sulfide, ammonia, and sulfur dioxide. Currently, the industry is developing rapidly and is moving towards wireless function and miniaturization. The improvement of communication function helps to integrate the detector into different devices and machines without reducing the detection capability of toxic or flammable gas within the safety distance.

[0003] In the prior art, the toxic gas detector is generally connected with an alarm controller and a linkage device (fan, electromagnetic valve, etc.) to form a flammable gas detection alarm system. The power supply of the toxic gas detector is usually direct current, and the power supply of the alarm controller is alternating current. The power supply of the toxic gas detector comes from the power conversion in the alarm controller. According to the standard requirements, the alarm controller needs to be tested for multiple electromagnetic compatibility detection items during the inspection and certification or type evaluation process, and needs to be tested together with the corresponding type of detector.

[0004] According to the standard requirements, the toxic gas detector is tested alone during the inspection and certification or type evaluation process, and since it belongs to a direct current power supply device, multiple electromagnetic compatibility related items are reduced, which weakens the anti-interference protection capability of the direct current power supply toxic gas detector from the design requirements. When it is used alone without connecting the alarm controller, it cannot guarantee high anti-electromagnetic interference capability. When it is subjected to electromagnetic interference, the concentration value of the toxic gas detector may jump irregularly and cause false alarm, or even stop and crash, resulting in poor user experience. SUMMARY

[0005] The utility model provides a kind of toxic gas detector control circuit capable of resisting electromagnetic interference, by being provided with mutually coordinated power voltage adjusting circuit, sensor voltage adjusting circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, sound-light prompt circuit, LED state display circuit and digital display screen in toxic gas detector control circuit capable of resisting electromagnetic interference, TVS tube, common mode inductance and diode are equipped in power voltage adjusting circuit, common mode and multiple TVS tubes are also equipped in 485 communication circuit, TVS tube and diode are also equipped in gas detector main control circuit, TVS tube, common mode inductance, diode can improve the anti-electromagnetic interference capability of gas detector main control circuit, 485 communication circuit, power voltage adjusting circuit, that is, by multiple electronic circuit protection measures, the anti-electromagnetic interference capability, reliability and stability of toxic gas detector when using alone are greatly improved, solve the problem that toxic gas detector has poor anti-electromagnetic interference capability and is prone to failure when using alone in prior art.

[0006] The utility model provides a kind of toxic gas detector control circuit capable of resisting electromagnetic interference, including power voltage adjusting circuit, sensor voltage adjusting circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, sound-light prompt circuit, LED state display circuit and digital display screen, the output of power voltage adjusting circuit is connected with temperature signal acquisition circuit, gas signal acquisition circuit, sensor voltage adjusting circuit, sensor acquisition control circuit, gas detector main control circuit power supply, the output of sensor voltage adjusting circuit is connected with gas signal acquisition circuit power supply, the output of gas detector main control circuit is connected with the input of 485 communication circuit, the input of sound-light prompt circuit, the input of LED state display circuit, the input of digital display screen control, gas detector main control circuit is also connected with sensor acquisition control circuit communication, sensor acquisition control circuit is connected with gas signal acquisition circuit, temperature signal acquisition circuit control, gas signal acquisition circuit can gather the concentration of carbon monoxide, hydrogen sulfide, ammonia and sulfur dioxide gas, TVS tube, common mode inductance and diode are equipped in power voltage adjusting circuit, common mode and multiple TVS tubes are also equipped in 485 communication circuit, TVS tube and diode are also equipped in gas detector main control circuit, TVS tube, common mode inductance, diode can improve the anti-electromagnetic interference capability of gas detector main control circuit, 485 communication circuit, power voltage adjusting circuit.

[0007] The utility model discloses further improvement, the gas detector main control circuit is equipped with the detector main control chip U5, crystal oscillator X1, magnetic bead B1, magnetic bead B2, electric capacity C14, electric capacity C16 and electric capacity C18, the detector main control chip U5 is equipped with 48 pins, the 1st pin of detector main control chip U5 is connected with the output end of power voltage adjustment circuit, the 31st, 29th, 30th pin of detector main control chip U5 is connected with the input end of 485 communication circuit, the 11th, 46th pin of detector main control chip U5 is connected with the input end of sound -light prompt circuit, the 16th, 15th, 14th, 28th pin of detector main control chip U5 is connected with the input end of LED state display circuit, the 20th, 19th, 18th pin of detector main control chip U5 is connected with the input end of digital display screen, the 5th, 6th pin of detector main control chip U5 is connected with sensor acquisition control circuit, the 5th pin of detector main control chip U5 is connected with one end of magnetic bead B1, the 6th pin of detector main control chip U5 is connected with one end of magnetic bead B2, one end of electric capacity C18, the other end of magnetic bead B1 is connected with one end of electric capacity C14, one end of crystal oscillator X1, the other end of magnetic bead B2 is connected with one end of electric capacity C16, the other end of crystal oscillator X1, the other end of electric capacity C14, the other end of electric capacity C16, the other end of electric capacity C18 ground connection.

[0008] The utility model discloses further improvement, the gas detector main control circuit still be equipped with current loop chip U11, triode Q1, field effect tube Q2, electric capacity C19, resistance R17, diode D12, TVS pipe D11, relay K1 and triode Q3, wherein, current loop chip U11 is equipped with 10 pins, the 4th pin of current loop chip U11 is connected with the 4th pin of detector main control chip U5, the 6th pin of current loop chip U11 can receive outside AD digital signal, the 2nd pin of current loop chip U11 is connected with the emitter of triode, the 3rd pin of current loop chip U11 is connected with the collector of triode, the grid of field effect tube Q2, the base of triode is connected with the source of field effect tube Q2, the drain of field effect tube Q2 is connected with one end of electric capacity C19, one end of resistance R17, the other end of resistance R17 is connected with the anode of diode D12, the cathode of diode D12 is connected with one end of TVS pipe D11, the cathode of diode D12 can output current signal, the other end of TVS pipe D11, the other end of electric capacity C19 is grounded;Relay K1 is equipped with 5 pins, the 2nd pin of relay K1 is connected with the collector of triode Q3, the base of triode Q3 is connected with the 3rd pin of detector main control chip U5, the emitter of triode Q3 is grounded, the 3rd, 4th, 5th pin of relay K1 can connect other electronic equipment of outside.

[0009] The utility model discloses further improvement makes, the power voltage adjustment circuit is equipped with voltage stabilizing chip U1, voltage stabilizing chip U2, voltage stabilizing chip U3, fuse resistance F1, diode D10, TVS pipe D1, common mode inductance L1, electric capacity C4, inductance L2, electric capacity C7, electric capacity C8 and electric capacity C9, wherein, voltage stabilizing chip U1 is equipped with 6 pins, voltage stabilizing chip U2 is equipped with 3 pins, voltage stabilizing chip U3 is equipped with 5 pins, the 4th pin of voltage stabilizing chip U1 is linked with the output of common mode inductance L1, one end of electric capacity C4, one end of electric capacity C7, the input of common mode inductance L1 is linked with one end of TVS pipe D1, one end of fuse resistance F1, the other end of fuse resistance F1 is linked with the negative pole of diode D10, and the positive pole of diode D10 is connected with 24V power supply, the 6th pin of voltage stabilizing chip U1 is linked with one end of inductance L2, and the other end of inductance L2 is linked with one end of electric capacity C8, one end of electric capacity C9, the 3rd pin of voltage stabilizing chip U2, the 1st pin of voltage stabilizing chip U3, the 1st pin of probe main control chip U5 is powered on with the 2nd pin of voltage stabilizing chip U2, the 5th pin of voltage stabilizing chip U3 is powered on with sensor voltage adjustment circuit, sensor acquisition control circuit, temperature signal acquisition circuit, gas signal acquisition circuit, and the other end of TVS pipe D1, the other end of electric capacity C7, the other end of electric capacity C8, the other end of electric capacity C9 are grounded;Voltage stabilizing chip U4 is equipped in sensor voltage adjustment circuit, voltage stabilizing chip U4 is equipped with 5 pins, the 3rd pin of voltage stabilizing chip U4 is linked with the 5th pin of voltage stabilizing chip U3, and the 4th pin of voltage stabilizing chip U4 is powered on with gas signal acquisition circuit.

[0010] The utility model discloses further improvement makes, and sensor acquisition control circuit is equipped with sensor acquisition control chip U13 in, sensor acquisition control chip U13 is equipped with 20 pins, and the 2nd pin of sensor acquisition control chip U13 is linked with the 5th pin of voltage stabilizing chip U3, and the 1st pin of sensor acquisition control chip U13 is linked with the 6th pin of probe main control chip U5 respectively, and the 5th pin of sensor acquisition control chip U13 is linked with gas signal acquisition circuit control connection, and the 5th pin of sensor acquisition control chip U13 is linked with temperature signal acquisition circuit control connection.

[0011] The utility model disc further improve, gas signal acquisition circuit inside be equipped with operational amplifier U14A, resistance R12, resistance R13, resistance R14, inductance L3 and electric capacity C17, the same phase input of operational amplifier U14A is connected with resistance R14 one end, resistance R14's other end is connected with the 4th pin of voltage stabilizing chip U4, the opposite phase input of operational amplifier U14A is connected with resistance R13 one end, resistance R13's other end is connected with inductance L3 one end, inductance L3's other end is connected with toxic gas acquisition sensor, the output of operational amplifier U14A is connected with resistance R12 one end, resistance R12's other end is connected with the 6th pin of sensor acquisition control chip U13 with.

[0012] The utility model disc further improve, temperature signal acquisition circuit inside be equipped with temperature signal acquisition chip U15 and electric capacity C12, temperature signal acquisition chip U15 is equipped with 3 pins, temperature signal acquisition chip U15's 1st pin is connected with voltage stabilizing chip U3's 5th pin, electric capacity C12 one end, temperature signal acquisition chip U15's 2nd pin is connected with sensor acquisition control chip U13's 5th pin, temperature signal acquisition chip U15's 3rd pin, electric capacity C12's other end ground.

[0013] The utility model disc further improve, 485 communication circuit inside be equipped with 485 communication chip U6, common mode inductance L6, TVS pipe D7 and TVS pipe D9, wherein, 485 communication chip U6 is equipped with 8 pins, 485 communication chip U6's 1st, 3rd, 4th pin is connected with sensor main control chip U5's 31st, 29th, 30th pin respectively, 485 communication chip U6's 8th pin is connected with voltage stabilizing chip U2's 2nd pin, 485 communication chip U6's 6th, 7th pin is connected with common mode inductance L6 one end, common mode inductance L6's other end can connect outside 485 communication equipment, common mode inductance L6's other end is connected with TVS pipe D7's negative pole, TVS pipe D9's negative pole still, TVS pipe D7's positive pole, TVS pipe D9's positive pole ground.

[0014] The utility model discloses further improve, the sound and light prompt circuit is equipped with triode Q4, loudspeaker prompt interface J6, triode Q5 and luminous prompt interface J7, wherein, the base of triode Q4 is connected with the 11th pin of detector main control chip U5, the collector of triode Q4 is connected with the input of loudspeaker prompt interface J6, the output of loudspeaker prompt interface J6 can connect external loudspeaker, the emitter of triode Q4 is grounded, the base of triode Q5 is connected with the 46th pin of detector main control chip U5, the collector of triode Q5 is connected with the input of luminous prompt interface J7, the output of luminous prompt interface J7 can connect external luminous LED lamp, the emitter of triode Q5 is grounded, the LED state display circuit is equipped with light emitting diode D1, light emitting diode D2, light emitting diode D3 and light emitting diode D4, wherein, the anode of light emitting diode D1, the anode of light emitting diode D2, the anode of light emitting diode D3, the anode of light emitting diode D4 are connected with the 2nd pin of voltage stabilizing chip U2, the cathode of light emitting diode D1 is connected with the 16th pin of detector main control chip U5, the cathode of light emitting diode D2 is connected with the 15th pin of detector main control chip U5, the cathode of light emitting diode D3 is connected with the 14th pin of detector main control chip U5, the cathode of light emitting diode D4 is connected with the 28th pin of detector main control chip U5.

[0015] The utility model discloses further improve, the model number of detector main control chip U5 is STM32F103C8T6, the model number of current loop chip U11 is XTR111, the model number of voltage stabilizing chip U1 is LM2842, the model number of voltage stabilizing chip U2 is AMS1117-3V3, the model number of voltage stabilizing chip U3 is TPS76333DBV, the model number of voltage stabilizing chip U4 is TLV376IDBVR, the model number of sensor acquisition control chip U13 is STM32C011F4U6TR, the model number of temperature signal acquisition chip U15 is TMP235A2DBZR, the model number of 485 communication chip U6 is SN65HVD72.

[0016] Compared with the prior art, the utility model has the advantages of providing a toxic gas detector control circuit capable of resisting electromagnetic interference, through setting mutually matched power voltage adjusting circuit, sensor voltage adjusting circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, audible -visual prompting circuit, LED state display circuit and digital display screen in the toxic gas detector control circuit capable of resisting electromagnetic interference, being equipped with TVS pipe, common mode inductor and diode in the power voltage adjusting circuit, also being equipped with common mode inductor and a plurality of TVS pipes in the 485 communication circuit, also being equipped with TVS pipe and diode in the gas detector main control circuit, TVS pipe, common mode inductor, diode can promote the anti - electromagnetic interference ability of gas detector main control circuit, 485 communication circuit, power voltage adjusting circuit, that is, through multiple electronic circuit protection measures, the anti - electromagnetic interference ability of toxic gas detector when using alone is improved greatly, the reliability and stability of toxic gas detector are improved, the combustible gas concentration can be detected in real time accurately in the scene that toxic gas detector is used alone when being separated from alarm controller power supply or external power supply, can adapt to various complex interference environment, improve user experience, solve the problem that the anti - electromagnetic interference ability of toxic gas detector when using alone in the prior art is poor and is prone to failure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the scheme of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0018] Figure 1 It is the principle block diagram of the utility model's a toxic gas detector control circuit capable of resisting electromagnetic interference;

[0019] Figure 2 It is the circuit diagram of the utility model's gas detector main control circuit;

[0020] Figure 3 It is the circuit diagram of the utility model's gas detector main control circuit;

[0021] Figure 4 It is the circuit diagram of the utility model's gas detector main control circuit;

[0022] Figure 5 It is the circuit diagram of the utility model's gas detector main control circuit;

[0023] Figure 6The circuit diagram of the power voltage adjustment circuit of the utility model;

[0024] Figure 7 The circuit diagram of the power voltage adjustment circuit of the utility model;

[0025] Figure 8 The circuit diagram of the sensor acquisition control circuit of the utility model;

[0026] Figure 9 The circuit diagram of the gas signal acquisition circuit of the utility model;

[0027] Figure 10 The circuit diagram of the temperature signal acquisition circuit of the utility model;

[0028] Figure 11 The circuit diagram of the 485 communication circuit of the utility model;

[0029] Figure 12 The circuit diagram of the sound and light prompting circuit of the utility model. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is used for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the description and drawings are to be regarded as illustrative in nature and embodiments of the application are described herein in terms of possible implementation, and various description, configurations, modifications, and changes can be made therein without departing from the spirit of the application; the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or any other variation thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0031] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments.

[0032] For those skilled in the technical field, the technical solutions of the present application will be better understood from the following detailed description of the embodiments of the present application, with reference to the accompanying drawings.

[0033] As Figures 1-12The utility model provides a kind of poisonous gas detector control circuit capable of resisting electromagnetic interference, including power supply voltage adjusting circuit, sensor voltage adjusting circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, sound-light prompt circuit, LED state display circuit and digital display screen, the output end of power supply voltage adjusting circuit is connected with temperature signal acquisition circuit, gas signal acquisition circuit, sensor voltage adjusting circuit, sensor acquisition control circuit, gas detector main control circuit power supply, the output end of sensor voltage adjusting circuit is connected with gas signal acquisition circuit power supply, the output end of gas detector main control circuit is connected with the input end of 485 communication circuit, the input end of sound-light prompt circuit, the input end of LED state display circuit, the input end of digital display screen control, gas detector main control circuit is also connected with sensor acquisition control circuit communication, sensor acquisition control circuit is connected with gas signal acquisition circuit, temperature signal acquisition circuit control, gas signal acquisition circuit can gather the concentration of carbon monoxide, hydrogen sulfide, ammonia and sulfur dioxide gas.In the embodiment, TVS tube, common mode inductance and diode are equipped in power supply voltage adjusting circuit, common mode inductance and multiple TVS tubes are also equipped in 485 communication circuit, TVS tube and diode are also equipped in gas detector main control circuit, TVS tube, common mode inductance, diode can improve the anti-electromagnetic interference ability of gas detector main control circuit, 485 communication circuit, power supply voltage adjusting circuit, that is, through multiple electronic circuit protection measures, the anti-electromagnetic interference ability of poisonous gas detector when using alone is greatly improved, the reliability and stability of poisonous gas detector are improved, real-time accurate detection of flammable gas concentration can be realized in the scene that poisonous gas detector is used alone when being separated from alarm controller power supply or external power supply, various complex interference environments can be adapted, and user experience is improved.

[0034] As Figures 2-3As shown, the gas detector main control circuit is provided with a detector main control chip U5, a crystal oscillator X1, magnetic beads B1, magnetic beads B2, a capacitor C14, a capacitor C16 and a capacitor C18. The model of the detector main control chip U5 is STM32F103C8T6. The detector main control chip U5 is provided with 48 pins. The first pin of the detector main control chip U5 is connected with the output end of the power voltage adjusting circuit. The 31st, 29th and 30th pins of the detector main control chip U5 are connected with the input end of the 485 communication circuit. The 11th and 46th pins of the detector main control chip U5 are connected with the input end of the sound and light prompting circuit. The 16th, 15th, 14th and 28th pins of the detector main control chip U5 are connected with the input end of the LED state display circuit. The 20th, 19th and 18th pins of the detector main control chip U5 are connected with the input end of the digital display screen. The 5th and 6th pins of the detector main control chip U5 are connected with the sensor collection control circuit. The 5th pin of the detector main control chip U5 is connected with one end of the magnetic beads B1. The 6th pin of the detector main control chip U5 is connected with one end of the magnetic beads B2 and one end of the capacitor C18. The other end of the magnetic beads B1 is connected with one end of the capacitor C14 and one end of the crystal oscillator X1. The other end of the magnetic beads B2 is connected with one end of the capacitor C16 and the other end of the crystal oscillator X1. The other end of the capacitor C14, the other end of the capacitor C16 and the other end of the capacitor C18 are grounded. Figures 4-5As shown, the gas detector main control circuit is further provided with a current loop chip U11, a transistor Q1, a field effect transistor Q2, a capacitor C19, a resistor R17, a diode D12, a TVS tube D11, a relay K1 and a transistor Q3. The model of the current loop chip U11 is XTR111. The current loop chip U11 is provided with 10 pins. The fourth pin of the current loop chip U11 is connected with the fourth pin of the detector main control chip U5. The sixth pin of the current loop chip U11 can receive external AD digital signals. The second pin of the current loop chip U11 is connected with the emitter of the transistor. The third pin of the current loop chip U11 is connected with the collector of the transistor and the gate of the field effect transistor Q2. The base of the transistor is connected with the source of the field effect transistor Q2. The drain of the field effect transistor Q2 is connected with one end of the capacitor C19 and one end of the resistor R17. The other end of the resistor R17 is connected with the anode of the diode D12. The cathode of the diode D12 is connected with one end of the TVS tube D11. The cathode of the diode D12 can output current signals. The other end of the TVS tube D11 and the other end of the capacitor C19 are grounded. The relay K1 is provided with 5 pins. The second pin of the relay K1 is connected with the collector of the transistor Q3. The base of the transistor Q3 is connected with the third pin of the detector main control chip U5. The emitter of the transistor Q3 is grounded. The third, fourth and fifth pins of the relay K1 can be connected with other external electronic devices. In the embodiment, the gas detector main control circuit is used to control the sensor acquisition control circuit to control the gas signal acquisition circuit and the temperature signal acquisition circuit to acquire the concentration of the combustible gas and the temperature. Meanwhile, the gas detector main control circuit is also used to control the sound and light prompt circuit to issue an alarm prompt, the LED state display circuit to display various states, the digital display screen to display various information, and the 485 communication circuit to communicate with external devices. The crystal oscillator X1 provides a clock frequency for the operation of the detector main control chip U5. The capacitor C14 and the capacitor C16 are used as starting capacitors. The magnetic beads B1 and the magnetic beads B2 can filter noise signals in the clock frequency signals. The capacitor C18 can bypass noise signals in the clock frequency signals. Compared with the ordinary crystal oscillator circuit, the circuit structure can provide higher clock frequency accuracy for the whole circuit. The current loop chip U11 controls the output of the 4mA-20mA current signal through the AD digital signal of the input end. The TVS tube D11 plays a role in releasing high voltage protection. The diode D12 plays a role in organizing current backflow protection. The resistor R17 plays a role in current limiting protection. The capacitor C19 plays a role in filtering. The circuit structure is an important module of the toxic gas detector, so that the toxic gas detector can output stable, reliable and high-precision 4mA-20mA current. The relay K1 can provide an interface for the external linkage device (fan, electromagnetic valve, etc.) of the toxic gas detector.

[0035] As Figures 6-7As shown, the power voltage adjusting circuit is provided with voltage stabilizing chip U1, voltage stabilizing chip U2, voltage stabilizing chip U3, fuse resistor F1, diode D10, TVS tube D1, common mode inductor L1, capacitor C4, inductor L2, capacitor C7, capacitor C8 and capacitor C9, wherein, the model of voltage stabilizing chip U1 is LM2842, the model of voltage stabilizing chip U2 is AMS1117-3V3, the model of voltage stabilizing chip U3 is TPS76333DBV, voltage stabilizing chip U1 is provided with 6 pins, voltage stabilizing chip U2 is provided with 3 pins, voltage stabilizing chip U3 is provided with 5 pins, the 4th pin of voltage stabilizing chip U1 is connected with the output end of common mode inductor L1, one end of capacitor C4 and one end of capacitor C7, the input end of common mode inductor L1 is connected with one end of TVS tube D1 and one end of fuse resistor F1, the other end of fuse resistor F1 is connected with the negative electrode of diode D10, the positive electrode of diode D10 is connected with 24V power supply, the 6th pin of voltage stabilizing chip U1 is connected with one end of inductor L2, the other end of inductor L2 is connected with one end of capacitor C8, one end of capacitor C9, the 3rd pin of voltage stabilizing chip U2 and the 1st pin of voltage stabilizing chip U3, the 2nd pin of voltage stabilizing chip U2 is connected with the 1st pin of detector main control chip U5 for power supply, the 5th pin of voltage stabilizing chip U3 is connected with sensor voltage adjusting circuit, sensor acquisition control circuit, temperature signal acquisition circuit and gas signal acquisition circuit for power supply, the other end of TVS tube D1, the other end of capacitor C7, the other end of capacitor C8 and the other end of capacitor C9 are grounded; sensor voltage adjusting circuit is provided with voltage stabilizing chip U4, the model of voltage stabilizing chip U4 is TLV376IDBVR, voltage stabilizing chip U4 is provided with 5 pins, the 3rd and 5th pins of voltage stabilizing chip U4 are connected with the 5th pin of voltage stabilizing chip U3, the 4th pin of voltage stabilizing chip U4 is connected with gas signal acquisition circuit for power supply. In the embodiment, the power voltage adjusting circuit is used for supplying power for temperature signal acquisition circuit, sensor voltage adjusting circuit, sensor acquisition control circuit and gas detector main control circuit. The power voltage adjusting circuit is composed of 3 sub-modules, the first sub-circuit module is composed of voltage stabilizing chip U1 and peripheral circuit, which reduces 24V DC power to 6V DC power, namely V6.0 in the figure. The second sub-circuit module is composed of voltage stabilizing chip U2 and peripheral circuit, which reduces 6V DC power to 3.3V DC power, namely V3.3 in the figure. The third sub-circuit module is composed of voltage stabilizing chip U3 and peripheral circuit, which reduces 6V DC power to another 3.3V DC power, namely SV3.3 in the figure.The diode D10 plays a role of preventing reverse connection of the power supply, the fuse resistor F1 plays a role of fusing the protection circuit when the current is too large, the TVS tube D1 can release transient high voltage such as surge voltage; the common mode inductance L1 can inhibit common mode / differential mode interference signals in the current, and enhance the anti-electromagnetic interference capability; the capacitor C4 and the capacitor C10 form a Y-type circuit with the ground, and can also effectively filter the differential mode interference signals in the current signal; the voltage stabilizing chip U1 selects a high-precision and high-stability model LM2842; the capacitor C7, the capacitor C8 and the capacitor C9 are filter capacitors, and multiple protections formed by electronic components make the whole power voltage regulating circuit have high anti-electromagnetic interference capability, and provide stable and reliable power supply for the following circuit.

[0036] As shown in Figure 8 The sensor acquisition control circuit is internally provided with a sensor acquisition control chip U13, the model of the sensor acquisition control chip U13 is STM32C011F4U6TR, the sensor acquisition control chip U13 is provided with 20 pins, the second pin of the sensor acquisition control chip U13 is connected with the fifth pin of the voltage stabilizing chip U3, the first pin and the twentieth pin of the sensor acquisition control chip U13 are respectively connected with the sixth pin and the fifth pin of the detector main control chip U5, the sixth pin of the sensor acquisition control chip U13 is connected with the gas signal acquisition circuit control, and the fifth pin of the sensor acquisition control chip U13 is connected with the temperature signal acquisition circuit control. In the embodiment, the sensor acquisition control circuit is used for controlling the gas signal acquisition circuit to acquire the combustible gas concentration signal and the temperature signal acquisition circuit to acquire the temperature signal.

[0037] As shown in Figure 9 The gas signal acquisition circuit is internally provided with an operational amplifier U14A, a resistor R12, a resistor R13, a resistor R14, an inductance L3 and a capacitor C17, the noninverting input end of the operational amplifier U14A is connected with one end of the resistor R14, the other end of the resistor R14 is connected with the fourth pin of the voltage stabilizing chip U4, the inverting input end of the operational amplifier U14A is connected with one end of the resistor R13, the other end of the resistor R13 is connected with one end of the inductance L3, the other end of the inductance L3 is connected with the toxic gas acquisition sensor, the output end of the operational amplifier U14A is connected with one end of the resistor R12, and the other end of the resistor R12 is connected with the sixth pin of the sensor acquisition control chip U13. In the embodiment, the gas signal acquisition circuit is used for converting the concentration value signal of the detected gas into an electric signal in real time according to the control instruction of the sensor acquisition control circuit, and outputting the electric signal to the sensor acquisition control circuit.

[0038] As shown in Figure 10As shown in the temperature signal acquisition circuit is provided with temperature signal acquisition chip U15 and capacitor C12, temperature signal acquisition chip U15 model is TMP235A2DBZR, temperature signal acquisition chip U15 is provided with 3 pins, the first pin of temperature signal acquisition chip U15 and the fifth pin of voltage stabilizing chip U3, one end of capacitor C12 is connected, the second pin of temperature signal acquisition chip U15 and the fifth pin of sensor acquisition control chip U13 are connected, the third pin of temperature signal acquisition chip U15, the other end of capacitor C12 is grounded. In this embodiment, the temperature signal acquisition circuit is used for collecting the environmental temperature into digital signal in real time according to the control instruction of sensor acquisition control circuit, and outputting to the sensor acquisition control circuit.

[0039] As shown in the temperature signal acquisition circuit is provided with temperature signal acquisition chip U15 and capacitor C12, temperature signal acquisition chip U15 model is TMP235A2DBZR, temperature signal acquisition chip U15 is provided with 3 pins, the first pin of temperature signal acquisition chip U15 and the fifth pin of voltage stabilizing chip U3, one end of capacitor C12 is connected, the second pin of temperature signal acquisition chip U15 and the fifth pin of sensor acquisition control chip U13 are connected, the third pin of temperature signal acquisition chip U15, the other end of capacitor C12 is grounded. In this embodiment, the temperature signal acquisition circuit is used for collecting the environmental temperature into digital signal in real time according to the control instruction of sensor acquisition control circuit, and outputting to the sensor acquisition control circuit. Figure 11 As shown in the temperature signal acquisition circuit is provided with temperature signal acquisition chip U15 and capacitor C12, temperature signal acquisition chip U15 model is TMP235A2DBZR, temperature signal acquisition chip U15 is provided with 3 pins, the first pin of temperature signal acquisition chip U15 and the fifth pin of voltage stabilizing chip U3, one end of capacitor C12 is connected, the second pin of temperature signal acquisition chip U15 and the fifth pin of sensor acquisition control chip U13 are connected, the third pin of temperature signal acquisition chip U15, the other end of capacitor C12 is grounded. In this embodiment, the temperature signal acquisition circuit is used for collecting the environmental temperature into digital signal in real time according to the control instruction of sensor acquisition control circuit, and outputting to the sensor acquisition control circuit.

[0040] As shown in the temperature signal acquisition circuit is provided with temperature signal acquisition chip U15 and capacitor C12, temperature signal acquisition chip U15 model is TMP235A2DBZR, temperature signal acquisition chip U15 is provided with 3 pins, the first pin of temperature signal acquisition chip U15 and the fifth pin of voltage stabilizing chip U3, one end of capacitor C12 is connected, the second pin of temperature signal acquisition chip U15 and the fifth pin of sensor acquisition control chip U13 are connected, the third pin of temperature signal acquisition chip U15, the other end of capacitor C12 is grounded. In this embodiment, the temperature signal acquisition circuit is used for collecting the environmental temperature into digital signal in real time according to the control instruction of sensor acquisition control circuit, and outputting to the sensor acquisition control circuit. Figure 12As shown, the sound and light prompt circuit is provided with a triode Q4, a speaker prompt interface J6, a triode Q5 and a light emitting prompt interface J7, wherein the base of the triode Q4 is connected with the 11th pin of the detector main control chip U5, the collector of the triode Q4 is connected with the input end of the speaker prompt interface J6, the output end of the speaker prompt interface J6 can be connected with an external loudspeaker, the emitter of the triode Q4 is grounded, the base of the triode Q5 is connected with the 46th pin of the detector main control chip U5, the collector of the triode Q5 is connected with the input end of the light emitting prompt interface J7, the output end of the light emitting prompt interface J7 can be connected with an external light emitting LED lamp, and the emitter of the triode Q5 is grounded; the LED state display circuit is provided with a light emitting diode D1, a light emitting diode D2, a light emitting diode D3 and a light emitting diode D4, wherein the positive pole of the light emitting diode D1, the positive pole of the light emitting diode D2, the positive pole of the light emitting diode D3 and the positive pole of the light emitting diode D4 are connected with the 2nd pin of the voltage stabilizing chip U2, the negative pole of the light emitting diode D1 is connected with the 16th pin of the detector main control chip U5, the negative pole of the light emitting diode D2 is connected with the 15th pin of the detector main control chip U5, the negative pole of the light emitting diode D3 is connected with the 14th pin of the detector main control chip U5, and the negative pole of the light emitting diode D4 is connected with the 28th pin of the detector main control chip U5. In the embodiment, the sound and light prompt circuit is divided into a sound reporting sub-module and a light reporting sub-module, wherein the sound reporting sub-module is composed of the triode Q4 and peripheral circuits, and provides a sound alarm function for the toxic gas detector; the light reporting sub-module is composed of the triode Q5 and peripheral circuits, and provides a light source alarm function for the toxic gas detector; the sound and light module provides a warning function when the detector detects different gas concentrations; and the LED state display circuit is used for indicating the running state of the toxic gas detector, for example, the red light emitting diode D1 is bright to indicate that the power supply is normal, and the yellow light emitting diode D3 is bright to indicate that a running fault occurs.

[0041] From the above, the utility model provides a kind of poisonous gas detector control circuit capable of resisting electromagnetic interference, by being equipped with mutually coordinated power voltage adjusting circuit, sensor voltage adjusting circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, sound-light prompt circuit, LED state display circuit and digital display screen in poisonous gas detector control circuit capable of resisting electromagnetic interference, TVS tube, common mode inductance and diode are equipped in power voltage adjusting circuit, 485 communication circuit is also equipped with common mode inductance and multiple TVS tubes, TVS tube and diode are also equipped in gas detector main control circuit, TVS tube, common mode inductance, diode can improve the anti-electromagnetic interference capability of gas detector main control circuit, 485 communication circuit, power voltage adjusting circuit, i.e.

[0042] The above-described specific embodiments are preferred embodiments of the utility model, and are not intended to limit the specific implementation range of the utility model. The scope of the utility model includes, but is not limited to, the specific embodiments. Any equivalent changes made in accordance with the utility model are within the scope of protection of the utility model.

Claims

1. A toxic gas detector control circuit capable of resisting electromagnetic interference, characterized by: Including power voltage adjustment circuit, sensor voltage adjustment circuit, gas detector main control circuit, sensor acquisition control circuit, gas signal acquisition circuit, temperature signal acquisition circuit, 485 communication circuit, sound and light prompt circuit, LED state display circuit and digital display screen, the output end of the power voltage adjustment circuit is connected with the temperature signal acquisition circuit, the gas signal acquisition circuit, the sensor voltage adjustment circuit, the sensor acquisition control circuit, the gas detector main control circuit power supply, the output end of the sensor voltage adjustment circuit is connected with the gas signal acquisition circuit power supply, the output end of the gas detector main control circuit is connected with the input end of the 485 communication circuit, the input end of the sound and light prompt circuit, the input end of the LED state display circuit, the input end of the digital display screen control, the gas detector main control circuit is also connected with the sensor acquisition control circuit communication, the sensor acquisition control circuit is connected with the gas signal acquisition circuit, the temperature signal acquisition circuit control, the gas signal acquisition circuit can collect the concentration of carbon monoxide, hydrogen sulfide, ammonia and sulfur dioxide gas, the power voltage adjustment circuit is provided with TVS tube, common mode inductor and diode, the 485 communication circuit is also provided with common mode inductor and multiple TVS tubes, the gas detector main control circuit is also provided with TVS tube and diode, TVS tube, common mode inductor, diode can improve the anti electromagnetic interference ability of the gas detector main control circuit, the 485 communication circuit, the power voltage adjustment circuit.

2. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 1, characterized in that: The gas detector main control circuit is internally provided with a detector main control chip U5, a crystal oscillator X1, magnetic beads B1, magnetic beads B2, a capacitor C14, a capacitor C16 and a capacitor C18, the detector main control chip U5 is provided with 48 pins, the first pin of the detector main control chip U5 is connected with the output end of the power voltage adjusting circuit, the 31st, 29th and 30th pins of the detector main control chip U5 are connected with the input end of the 485 communication circuit, the 11th and 46th pins of the detector main control chip U5 are connected with the input end of the sound and light prompting circuit, the 16th, 15th, 14th and 28th pins of the detector main control chip U5 are connected with the input end of the LED state display circuit, the 20th, 19th and 18th pins of the detector main control chip U5 are connected with the input end of the digital display screen, the 5th and 6th pins of the detector main control chip U5 are connected with the sensor acquisition control circuit, the 5th pin of the detector main control chip U5 is connected with one end of the magnetic beads B1, the 6th pin of the detector main control chip U5 is connected with one end of the magnetic beads B2 and one end of the capacitor C18, the other end of the magnetic beads B1 is connected with one end of the capacitor C14 and one end of the crystal oscillator X1, the other end of the magnetic beads B2 is connected with one end of the capacitor C16 and the other end of the crystal oscillator X1, the other end of the capacitor C14, the other end of the capacitor C16 and the other end of the capacitor C18 are grounded.

3. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 2, characterized in that: The gas detector main control circuit is internally provided with a detector main control chip U5, a crystal oscillator X1, magnetic beads B1, magnetic beads B2, a capacitor C14, a capacitor C16 and a capacitor C18, the detector main control chip U5 is provided with 48 pins, the first pin of the detector main control chip U5 is connected with the output end of the power voltage adjusting circuit, the 31st, 29th and 30th pins of the detector main control chip U5 are connected with the input end of the 485 communication circuit, the 11th and 46th pins of the detector main control chip U5 are connected with the input end of the sound and light prompting circuit, the 16th, 15th, 14th and 28th pins of the detector main control chip U5 are connected with the input end of the LED state display circuit, the 20th, 19th and 18th pins of the detector main control chip U5 are connected with the input end of the digital display screen, the 5th and 6th pins of the detector main control chip U5 are connected with the sensor acquisition control circuit, the 5th pin of the detector main control chip U5 is connected with one end of the magnetic beads B1, the 6th pin of the detector main control chip U5 is connected with one end of the magnetic beads B2 and one end of the capacitor C18, the other end of the magnetic beads B1 is connected with one end of the capacitor C14 and one end of the crystal oscillator X1, the other end of the magnetic beads B2 is connected with one end of the capacitor C16 and the other end of the crystal oscillator X1, the other end of the capacitor C14, the other end of the capacitor C16 and the other end of the capacitor C18 are grounded.

4. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 3, characterized in that: The power voltage adjusting circuit is internally provided with voltage stabilizing chip U1, voltage stabilizing chip U2, voltage stabilizing chip U3, fuse resistor F1, diode D10, TVS tube D1, common mode inductor L1, capacitor C4, inductor L2, capacitor C7, capacitor C8 and capacitor C9, wherein the voltage stabilizing chip U1 is provided with 6 pins, the voltage stabilizing chip U2 is provided with 3 pins, the voltage stabilizing chip U3 is provided with 5 pins, the 4th pin of the voltage stabilizing chip U1 is connected with the output end of the common mode inductor L1, one end of the capacitor C4 and one end of the capacitor C7, the input end of the common mode inductor L1 is connected with one end of the TVS tube D1 and one end of the fuse resistor F1, the other end of the fuse resistor F1 is connected with the negative electrode of the diode D10, the positive electrode of the diode D10 is connected with a 24V power supply, the 6th pin of the voltage stabilizing chip U1 is connected with one end of the inductor L2, the other end of the inductor L2 is connected with one end of the capacitor C8, one end of the capacitor C9, the 3rd pin of the voltage stabilizing chip U2 and the 1st pin of the voltage stabilizing chip U3, the 2nd pin of the voltage stabilizing chip U2 is connected with the 1st pin of the detector main control chip U5 for power supply, the 5th pin of the voltage stabilizing chip U3 is connected with the sensor voltage adjusting circuit, the sensor acquisition control circuit, the temperature signal acquisition circuit and the gas signal acquisition circuit for power supply, the other end of the TVS tube D1, the other end of the capacitor C7, the other end of the capacitor C8, the other end of the capacitor C9 are grounded; the sensor voltage adjusting circuit is internally provided with voltage stabilizing chip U4, the voltage stabilizing chip U4 is provided with 5 pins, the 3rd and 5th pins of the voltage stabilizing chip U4 are connected with the 5th pin of the voltage stabilizing chip U3, the 4th pin of the voltage stabilizing chip U4 is connected with the gas signal acquisition circuit for power supply.

5. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 4, characterized in that: The sensor acquisition control circuit is internally provided with sensor acquisition control chip U13, the sensor acquisition control chip U13 is provided with 20 pins, the 2nd pin of the sensor acquisition control chip U13 is connected with the 5th pin of the voltage stabilizing chip U3, the 1st and 20th pins of the sensor acquisition control chip U13 are respectively connected with the 6th and 5th pins of the detector main control chip U5, the 6th pin of the sensor acquisition control chip U13 is connected with the gas signal acquisition circuit for control, the 5th pin of the sensor acquisition control chip U13 is connected with the temperature signal acquisition circuit for control.

6. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 5, characterized in that: The gas signal acquisition circuit is internally provided with an operational amplifier U14A, a resistor R12, a resistor R13, a resistor R14, an inductor L3 and a capacitor C17, one end of the resistor R14 is connected to the noninverting input terminal of the operational amplifier U14A, the other end of the resistor R14 is connected to the fourth pin of the voltage stabilizing chip U4, one end of the resistor R13 is connected to the inverting input terminal of the operational amplifier U14A, the other end of the resistor R13 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to the toxic gas acquisition sensor, the output terminal of the operational amplifier U14A is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the sixth pin of the sensor acquisition control chip U13.

7. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 6, characterized in that: The temperature signal acquisition circuit is internally provided with a temperature signal acquisition chip U15 and a capacitor C12, the temperature signal acquisition chip U15 is provided with three pins, the first pin of the temperature signal acquisition chip U15 is connected to the fifth pin of the voltage stabilizing chip U3 and one end of the capacitor C12, the second pin of the temperature signal acquisition chip U15 is connected to the fifth pin of the sensor acquisition control chip U13, the third pin of the temperature signal acquisition chip U15 and the other end of the capacitor C12 are grounded.

8. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 7, characterized in that: The 485 communication circuit is internally provided with a 485 communication chip U6, a common mode inductor L6, a TVS tube D7 and a TVS tube D9, wherein the 485 communication chip U6 is provided with eight pins, the first pin, the third pin and the fourth pin of the 485 communication chip U6 are connected to the thirty-first pin, the twenty-ninth pin and the thirtieth pin of the detector main control chip U5 respectively, the eighth pin of the 485 communication chip U6 is connected to the second pin of the voltage stabilizing chip U2, the sixth pin and the seventh pin of the 485 communication chip U6 are connected to one end of the common mode inductor L6, the other end of the common mode inductor L6 can be connected to external 485 communication equipment, the other end of the common mode inductor L6 is also connected to the negative electrode of the TVS tube D7 and the negative electrode of the TVS tube D9, the positive electrode of the TVS tube D7 and the positive electrode of the TVS tube D9 are grounded.

9. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 8, characterized in that: The sound light prompt circuit is internally provided with a triode Q4, a loudspeaker prompt interface J6, a triode Q5 and a light emitting prompt interface J7, wherein the base of the triode Q4 is connected with the 11th pin of the detector main control chip U5, the collector of the triode Q4 is connected with the input end of the loudspeaker prompt interface J6, the output end of the loudspeaker prompt interface J6 can be connected with an external loudspeaker, the emitter of the triode Q4 is grounded, the base of the triode Q5 is connected with the 46th pin of the detector main control chip U5, the collector of the triode Q5 is connected with the input end of the light emitting prompt interface J7, the output end of the light emitting prompt interface J7 can be connected with an external light emitting LED lamp, and the emitter of the triode Q5 is grounded; the LED state display circuit is internally provided with light emitting diodes D1, D2, D3 and D4, wherein the anode of the light emitting diode D1, the anode of the light emitting diode D2, the anode of the light emitting diode D3 and the anode of the light emitting diode D4 are connected with the 2nd pin of the voltage stabilizing chip U2, the cathode of the light emitting diode D1 is connected with the 16th pin of the detector main control chip U5, the cathode of the light emitting diode D2 is connected with the 15th pin of the detector main control chip U5, the cathode of the light emitting diode D3 is connected with the 14th pin of the detector main control chip U5, and the cathode of the light emitting diode D4 is connected with the 28th pin of the detector main control chip U5.

10. The toxic gas detector control circuit capable of anti-electromagnetic interference according to claim 9, characterized in that: The model of the detector main control chip U5 is STM32F103C8T6, the model of the current loop chip U11 is XTR111, the model of the voltage stabilizing chip U1 is LM2842, the model of the voltage stabilizing chip U2 is AMS1117-3V3, the model of the voltage stabilizing chip U3 is TPS76333DBV, the model of the voltage stabilizing chip U4 is TLV376IDBVR, the model of the sensor acquisition control chip U13 is STM32C011F4U6TR, the model of the temperature signal acquisition chip U15 is TMP235A2DBZR, and the model of the 485 communication chip U6 is SN65HVD72.

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