Hydrogen and carbon monoxide composite gas monitoring system

Abstract

The utility model discloses a hydrogen and carbon monoxide composite gas monitoring system, which belongs to the technical field of gas monitoring and comprises a power supply module, an MCU (Microprogrammed Control Unit) module, a hydrogen monitoring module, a carbon monoxide monitoring module, a temperature monitoring module and an interface module. According to the monitoring system provided by the utility model, the hydrogen detection module and the carbon monoxide detection module are integrated to realize two-in-one monitoring of the concentrations of hydrogen and carbon monoxide in the environment, so that the product volume is reduced, and the monitoring system is suitable for various installation places; meanwhile, faults such as the service life and falling of the sensor are monitored and output in real time, and the effectiveness of monitoring the concentration of hydrogen and carbon monoxide in the environment is further guaranteed; the high-quality industrial sensor is adopted, the advantages of high sensitivity, high environmental adaptability, alcohol resistance and the like are achieved on the premise that the cost advantage is guaranteed, and the accuracy and reliability of concentration data of hydrogen and carbon monoxide in the environment are fully guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas monitoring technical field, specifically a hydrogen and carbon monoxide compound gas monitoring system. BACKGROUND

[0002] With the rapid development of energy storage technology, its safety problem is increasingly prominent. In recent years, global energy storage safety accidents have occurred frequently, posing a serious threat to people's life and property safety. The electrolyte in the energy storage battery is prone to produce a large amount of typical combustible gas such as hydrogen (H2) and carbon monoxide (CO) when it is out of control, and the combustion reaction is violent. Moreover, hydrogen is a flammable and explosive gas, and once a fire occurs, a secondary explosion is likely to occur, causing extensive losses. SUMMARY

[0003] The utility model solves the technical problem of the prior art, and provides a hydrogen and carbon monoxide compound gas monitoring system, which realizes real-time monitoring of H2 and CO gas concentrations in the environment by integrating a hydrogen monitoring module and a carbon monoxide monitoring module, so that major safety accidents caused by gas leakage concentration exceeding the threshold value can be avoided.

[0004] To solve the above technical problems, the utility model provides a hydrogen and carbon monoxide compound gas monitoring system, which comprises:

[0005] A power module is responsible for voltage conversion, and realizes wide voltage input and power voltage VCC and reference voltage Vref output;

[0006] An MCU module is connected with the power module, the sensor module and the interface module, is used for collecting data of the sensor module, calculates gas concentration according to the collected data and compares it with a preset gas concentration threshold value, controls the output end to output corresponding signals according to the comparison result, and controls the output end to communicate with external equipment in real time, transmits environment gas concentration and module state information;

[0007] A sensor module is connected with the power module and the MCU module, and comprises a hydrogen monitoring module, a carbon monoxide monitoring module and a temperature monitoring module. The hydrogen monitoring module is responsible for real-time monitoring of hydrogen concentration, converts hydrogen concentration into a voltage signal for the MCU to collect; the carbon monoxide monitoring module is responsible for real-time monitoring of carbon monoxide concentration, converts carbon monoxide concentration into a voltage signal for the MCU to collect; and the temperature monitoring module is responsible for collecting environment temperature and converting temperature signals into voltage signals for the MCU to collect;

[0008] An interface module is connected with the MCU module, the output end and the input end, and is responsible for MCU program burning and state signal output.

[0009] As a further description of the above technical solution, the power module includes a voltage conversion chip U1, the voltage conversion chip U1 has an input port Vin, a ground port GND and an output port Vout, the input port Vin is connected with an external power supply VDD, the output port Vout is connected with a power voltage VCC port, a reference voltage Vref port and a ground port of the power module respectively, wherein a capacitor C19 is connected in series between the input port Vin and the ground, a capacitor C3 is connected in series between the output port Vout and the ground, a capacitor C4 is connected in parallel on the capacitor C3, a resistor R17 is connected in series between the output port Vout and the reference voltage Vref port, a resistor R18 is further connected in series between the output port Vout and the ground port of the power module, a resistor R22 and a capacitor C16 are connected in parallel on the resistor R18.

[0010] As a further description of the above technical solution, the MCU module is connected with the power voltage VCC and includes an MCU chip U3, the MCU chip U3 has an AD_CO pin, a DO3 pin, a DO2 pin, a RESET pin, an AD_H2 pin, a DO1 pin, a VCAP pin, a VDCC pin, a DI1 pin, an LED pin, a SWCLK pin, a SWDIO pin, an AD_TEMP pin, a DI2 pin, a U0_TXD pin and a U0_RXD pin, wherein a resistor R9 is connected in series between the RESET pin and the power voltage VCC, a capacitor C7 is connected in series between the RESET pin and the ground, a capacitor C9 is connected in series between the VCAP pin and the ground, a capacitor C10 is connected in parallel on the capacitor C9, a capacitor C11 is connected in series between the VDCC pin and the ground, and a capacitor C12 is connected in parallel on the capacitor C11.

[0011] As a further description of the above technical solution, the hydrogen monitoring module is connected with the power voltage VCC, the reference voltage Vref and the AD_H2 pin of the MCU chip U3, and includes a hydrogen sensor SE2, the hydrogen sensor SE2 has a W pin, a C pin and an R pin, wherein a resistor R23 is connected in series between the R pin and the C pin, a capacitor C17 is connected in parallel on the resistor R23, a first amplification circuit is formed between the R pin and the reference voltage Vref through an operational amplifier U8A, and an output end of the first amplification circuit is connected with the C pin; a second amplification circuit is formed between the W pin and the reference voltage Vref through an operational amplifier U8B, an output end of the second amplification circuit is connected with the AD_H2 pin of the MCU chip U3, and an RC filter is further connected between the output end of the second amplification circuit and the AD_H2 pin of the MCU chip U3; a MOS triode Q2 is connected in series between the W pin and the R pin, a source of the MOS triode Q2 is connected with the power voltage VCC, and a resistor R21 is connected in series between the source of the MOS triode Q2 and the power voltage VCC.

[0012] As a further description of the above technical scheme, the first amplification circuit comprises an operational amplifier U8A, the same direction input end of the operational amplifier U8A is connected with a reference voltage Vref and ground, a resistor R25 is connected in series between the operational amplifier U8A and the reference voltage Vref, and a capacitor C26 is connected in series between the operational amplifier U8A and the ground; the second amplification circuit comprises an operational amplifier U8B, the same direction input end of the operational amplifier U8B is connected with the reference voltage Vref, a resistor R16 is connected in series between the operational amplifier U8B and the reference voltage Vref, the reverse input end of the operational amplifier U8B is connected with a W pin, a resistor R14 is connected in series between the reverse input end of the operational amplifier U8B and the W pin, and a resistor R12, a resistor R13 and a capacitor C13 are connected in parallel between the reverse input end and the output end of the operational amplifier U8B; the RC filter comprises resistors R15 and R30 and capacitors C14 and C30, the resistors R15 and R30 are connected in series between the output end of the operational amplifier U8B and the AD_H2 pin of the MCU chip U3, the capacitor C14 is connected in series between the resistor R15 and the ground, and the capacitor C21 is connected in series between the resistor R30 and the ground.

[0013] As a further description of the above technical scheme, the carbon monoxide monitoring module is connected with a power voltage VCC, a reference voltage Vref and an AD_CO pin of the MCU chip U3, and comprises a carbon monoxide sensor SE1, the carbon monoxide sensor SE1 has a W pin, a C pin and an R pin, a resistor R8 is connected in series between the R pin and the C pin, a capacitor C6 is connected in parallel on the resistor R8, a third amplification circuit is formed between the R pin and the reference voltage Vref through an operational amplifier U4B, and the output end of the third amplification circuit is connected with the C pin; a fourth amplification circuit is formed between the W pin and the reference voltage Vref through an operational amplifier U4A, the output end of the fourth amplification circuit is connected with the AD_CO pin of the MCU chip U3, and an RC filter is further connected between the output end of the fourth amplification circuit and the AD_CO pin of the MCU chip U3; a MOS triode Q1 is connected in series between the W pin and the R pin, the source of the MOS triode Q1 is connected with the power voltage VCC, and a resistor R7 is connected in series between the source of the MOS triode Q1 and the power voltage VCC.

[0014] As a further description of the above technical solution, the third amplifier circuit includes an operational amplifier U4B, the non-inverting input terminal of the operational amplifier U4B is connected to the reference voltage Vref and the ground, a resistor R11 is connected in series between the operational amplifier U4B and the reference voltage Vref, and a capacitor C25 is connected in series between the operational amplifier U4B and the ground; the fourth amplifier circuit includes an operational amplifier U4A, the non-inverting input terminal of the operational amplifier U4A is connected to the reference voltage Vref, a resistor R6 is connected in series between the operational amplifier U4A and the reference voltage Vref, and a capacitor C25 is connected in series between the operational amplifier U4A and the ground. The inverting input terminal of the amplifier U4A is connected to the W pin, a resistor R3 is connected in series between the inverting input terminal of the operational amplifier U4A and the W pin, and a resistor R1, a resistor R2 and a capacitor C1 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U4A; the RC filter includes resistors R5, R20 and capacitors C5, C24, resistors R5 and R20 are connected in series between the output terminal of the operational amplifier U4A and the AD_CO pin of the MCU chip U3, capacitor C5 is connected in series between resistor R5 and ground, and capacitor C24 is connected in series between resistor R20 and ground.

[0015] As a further description of the above technical solution, the temperature monitoring module is connected to the power supply voltage VCC and the AD_TEMP pin of the MCU chip U3, including an NTC resistor R20, a capacitor C15 is connected in parallel to the NTC resistor R20, and a resistor R19 is connected in series between the NTC resistor R20 and the power supply voltage VCC.

[0016] As a further description of the above technical solution, the interface module includes ESD chips U6, U7, terminal blocks J1, J2, J3, limit switches SW1, SW2 and onboard indicator lights, wherein the ESD chips U6 and U7 are used to protect the system from static electricity, the terminal block J1 is the system digital signal output interface, the terminal block J2 is the system and external device serial data communication interface, and the terminal block J3 is the system program burning interface; the limit switches SW1 and SW2 are used for system sensor detachment monitoring.

[0017] As a further description of the above technical solution, the onboard indicator light includes an LED lamp, and a resistor R31 is connected in series between the LED lamp and the LED pin of the MCU chip U3.

[0018] The monitoring system provided by the present invention realizes a two-in-one monitoring of the concentrations of hydrogen and carbon monoxide in the environment through the onboard integrated hydrogen detection module and carbon monoxide detection module, which greatly reduces the volume of the product and is convenient for installation in various places; it adopts the chips and sensors that have been produced, realizes independent control while controlling the development cost, and is conducive to the later batch production; it adopts high-quality electrochemical sensors, which have the advantages of high sensitivity, strong environmental adaptability, and alcohol resistance while ensuring cost advantages, and fully guarantees the accuracy and reliability of the hydrogen and carbon monoxide concentration data in the environment; at the same time, the monitoring system also monitors and outputs the sensor life and faults such as shedding in real time, further ensuring the effectiveness of hydrogen and carbon monoxide concentration monitoring in the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a block diagram of the hydrogen and carbon monoxide composite gas monitoring system provided by the present utility model;

[0020] Figure 2 This is the circuit diagram of the power module;

[0021] Figure 3 This is the circuit diagram of the MCU module;

[0022] Figure 4 This is the circuit diagram of the hydrogen monitoring module;

[0023] Figure 5 This is the circuit diagram of the carbon monoxide monitoring module;

[0024] Figure 6 This is the circuit diagram of the temperature monitoring module;

[0025] Figure 7 This is the circuit diagram of the interface module. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment provides a hydrogen and carbon monoxide composite gas monitoring system, such as Figure 1 Shown, including:

[0028] The power module is responsible for voltage conversion, realizing wide voltage VDD input and power voltage VCC and reference voltage Vref output;

[0029] The MCU module is connected to the power module, sensor module, and interface module. It is used to collect sensor data, calculate the gas concentration based on the collected sensor signal, and compare it with the preset gas concentration threshold. If the gas concentration is higher than the threshold, the output end of the control interface module outputs a corresponding control signal, and the onboard indicator light flashes at a predetermined frequency. If the gas concentration is lower than the threshold, the gas concentration in the environment continues to be monitored normally. At the same time, the MCU module controls the output port to communicate with the external device in real time, transmitting information such as the ambient gas concentration and module status.

[0030] The sensor module is connected to the power module and the MCU module, and includes a hydrogen monitoring module, a carbon monoxide monitoring module, and a temperature monitoring module. The hydrogen monitoring module is responsible for real-time monitoring of hydrogen concentration, converting the hydrogen concentration into a voltage signal, which is amplified by the amplifier circuit and then collected by the MCU; the carbon monoxide monitoring module is responsible for real-time monitoring of carbon monoxide concentration, converting the carbon monoxide concentration into a voltage signal, which is amplified by the amplifier circuit and then collected by the MCU; the temperature monitoring module is responsible for collecting ambient temperature and converting the temperature signal into a voltage signal for collection by the MCU;

[0031] Interface module: connected to the MCU module, output terminal and input terminal, responsible for MCU program burning and status signal output.

[0032] The power module is as follows Figure 2 As shown, the voltage conversion chip U1 includes an input port Vin, a ground port GND, an output port Vout and reserved ports NC1 and NC2. The input port Vin is connected to the external power supply VDD, and the output port Vout is connected to the power supply voltage VCC port, the reference voltage Vref port and the ground terminal of the power module respectively. A capacitor C19 is connected in series between the input port Vin and the ground port GND. The capacitor C19 is used for input power filtering. A capacitor C3 is connected in series between the output port Vout and the ground. A capacitor C4 is connected in parallel to the capacitor C3. The capacitors C3 and C4 are responsible for output power filtering. A resistor R17 is connected in series between the port Vout and the reference voltage Vref port, and a resistor R18 is also connected in series between the output port Vout and the ground terminal of the power module. A resistor R22 and a capacitor C16 are connected in parallel to the resistor R18. The resistors R17, R18, and R22 are used to divide the voltage to form the reference voltage Vref. The capacitor C16 is used to filter the reference voltage Vref. A resistor R4 is connected in series between the reserved port NC1 and the input port Vin. The resistor R4 is used to enable the voltage conversion chip U1. A resistor R26 is also connected in series between the input port Vin and the output port Vout. The resistor R26 is a reserved resistor for the subsequent cost reduction solution.

[0033] The MCU module is as follows Figure 3As shown, the MCU module is connected with the power voltage VCC, and includes an MCU chip U3, the MCU chip U3 has an AD CO pin, a DO3 pin, a DO2 pin, a RESET pin, an AD H2 pin, a DO1 pin, a VCAP pin, a VDCC pin, a DI1 pin, an LED pin, an SWCLK pin, an SWDIO pin, an AD TEMP pin, a DI2 pin, a U0 TXD pin and a U0 RXD pin, wherein the RESET pin is connected with the power voltage VCC in series with a resistor R9, the resistor R9 is used for pulling up the MCU chip U3 reset voltage; the RESET pin is connected with the ground in series with a capacitor C7, the capacitor C7 is used for reset voltage filtering, the VCAP pin is connected with the ground in series with a capacitor C9, the capacitor C9 is connected with a capacitor C10 in parallel, the capacitor C9 and the capacitor C10 are connected in parallel to decouple and filter VACP, the VDCC pin is connected with the ground in series with a capacitor C11, the capacitor C11 is connected with a capacitor C12 in parallel, the capacitor C11 and the capacitor C12 are connected in parallel to filter the power voltage of the MCU chip U3.

[0034] The hydrogen monitoring module is as shown in Figure 4As shown, the hydrogen monitoring module is connected with the power supply voltage VCC, the reference voltage Vref and the AD_H2 pin of the MCU chip U3, and includes a hydrogen sensor SE2 having a W pin, a C pin and an R pin, wherein a resistor R23 is connected in series between the R pin and the C pin, the resistor R23 is used to increase the impedance between the R pin and the W pin, and forms a negative feedback with an operational amplifier U8A, a capacitor C17 is connected in parallel with the resistor R23, and the capacitor C17 is used to smooth the output of the operational amplifier U8A; in a normal working state, a first amplification circuit is formed between the R pin and the reference voltage Vref through the operational amplifier U8A, an output end of the first amplification circuit is connected with the C pin, and an output voltage signal is output to the C pin, the first amplification circuit includes the operational amplifier U8A, a same direction input end of the operational amplifier U8A is connected with the reference voltage Vref and the ground, a resistor R25 is connected in series between the operational amplifier U8A and the reference voltage Vref, and a capacitor C26 is connected in series between the operational amplifier U8A and the ground, the resistor R25 is used to input the reference voltage Verf to the same direction input end of the operational amplifier U8A, and the capacitor C26 is used for filtering, a positive power supply end of the operational amplifier U8A is grounded, a negative power supply end of the operational amplifier U8A is connected with the power supply voltage VCC and the ground, and a capacitor C18 is connected in series between the negative power supply end and the ground, and the capacitor C18 is used for power supply filtering of the operational amplifier U8A.The W pin and the reference voltage Vref form a second amplification circuit through the operational amplifier U8B, the output end of the second amplification circuit is connected with the AD_H2 pin of the MCU chip U3, and an RC filter is further connected between the output end of the second amplification circuit and the AD_H2 pin of the MCU chip U3, the second amplification circuit comprises the operational amplifier U8B, the same direction input end of the operational amplifier U8B is connected with the reference voltage Vref, a resistor R16 is connected in series between the operational amplifier U8B and the reference voltage Vref, the resistor R16 is used for inputting the reference voltage Verf to the same direction input end of the operational amplifier U8B, the reverse direction input end of the operational amplifier U8B is connected with the W pin, a resistor R14 is connected in series between the reverse direction input end of the operational amplifier U8B and the W pin, resistors R12 and R13 and a capacitor C13 are connected in parallel between the reverse direction input end and the output end of the operational amplifier U8B, the resistor R14 and the resistors R12 and R13 form an amplification parameter, and the capacitor C13 is used for smoothing filtering, the hydrogen sensor SE2 forms a current signal corresponding to the concentration between the W pin and the C pin under different hydrogen concentrations, the current signal is transmitted to the MCU chip U3 for processing after being amplified by the second amplification circuit and being filtered by the RC filter, the first amplification circuit and the second amplification circuit jointly form a double-channel amplification operation, the RC filter comprises resistors R15 and R30 and capacitors C14 and C30, and is used for smoothing the signal output by the second amplification circuit, the resistors R15 and R30 are connected in series between the output end of the operational amplifier U8B and the AD_H2 pin of the MCU chip U3, the capacitor C14 is connected in series between the resistor R15 and the ground, and the capacitor C21 is connected in series between the resistor R30 and the ground, a MOS triode Q2 is connected in series between the W pin and the R pin, the source of the MOS triode Q2 is connected with the power supply voltage VCC, a resistor R21 is connected in series between the source of the MOS triode Q2 and the power supply voltage VCC, the resistor R21 is used for voltage input of the MOS triode Q2, the MOS triode Q2 is used for disconnecting the R pin and the W pin after power-on and connecting the R pin and the W pin after power-off, and the voltage balance between the two ends is ensured.

[0035] The carbon monoxide monitoring module is as follows Figure 5The carbon monoxide monitoring module is connected with the power supply voltage VCC, the reference voltage Vref and the AD_H2 pin of the MCU chip U3, and includes a carbon monoxide sensor SE1. The carbon monoxide sensor SE1 has W, C and R pins. The resistance R8 is connected in series between the R pin and the C pin, and is used to increase the impedance between the R pin and the W pin and form a negative feedback with the operational amplifier U4B. The capacitor C6 is connected in parallel with the resistance R8 and is used to smooth the output of the operational amplifier U4B. In a normal working state, the R pin and the reference voltage Vref form a first amplification circuit through the operational amplifier U4B. The output end of the first amplification circuit is connected with the C pin and outputs a voltage signal to the C pin. The first amplification circuit includes the operational amplifier U4B. The same direction input end of the operational amplifier U4B is connected with the reference voltage Vref and the ground. The resistance R11 is connected in series between the operational amplifier U4B and the reference voltage Vref. The capacitor C25 is connected in series between the operational amplifier U4B and the ground. The resistance R11 is used to input the reference voltage Verf to the same direction input end of the operational amplifier U4B. The capacitor C25 is used for filtering. The W pin and the reference voltage Vref form a second amplification circuit through the operational amplifier U4A. The output end of the second amplification circuit is connected with the AD_CO pin of the MCU chip U3. An RC filter is further connected between the output end of the second amplification circuit and the AD_CO pin of the MCU chip U3. The second amplification circuit includes the operational amplifier U4A. The same direction input end of the operational amplifier U4A is connected with the reference voltage Vref. The resistance R6 is connected in series between the operational amplifier U4A and the reference voltage Vref. The resistance R6 is used to input the reference voltage Verf to the same direction input end of the operational amplifier U4A. The reverse input end of the operational amplifier U4A is connected with the W pin. The resistance R3 is connected in series between the reverse input end of the operational amplifier U4A and the W pin. The resistance R1, the resistance R2 and the capacitor C1 are connected in parallel between the reverse input end and the output end of the operational amplifier U4A. The resistance R3 and the resistances R1 and R2 constitute an amplification parameter. The capacitor C1 is used for smoothing and filtering. The carbon monoxide sensor SE1 generates a current signal corresponding to the concentration between the W pin and the C pin under different carbon monoxide concentrations. The current signal is amplified by the second amplification circuit and then filtered by the RC filter before being transmitted to the MCU chip U3 for processing. The first amplification circuit and the second amplification circuit jointly form a double-channel amplification operation. The RC filter includes the resistances R5 and R20 and the capacitors C5 and C24, and is used to smooth the signal output by the second amplification circuit. The resistances R5 and R20 are connected in series between the output end of the operational amplifier U4A and the AD_CO pin of the MCU chip U3. The capacitor C5 is connected in series between the resistance R5 and the ground. The capacitor C24 is connected in series between the resistance R20 and the ground.A MOS triode Q1 is connected in series between the W pin and the R pin, the source of the MOS triode Q1 is connected to the power supply voltage VCC, a resistor R7 is connected in series between the source of the MOS triode Q1 and the power supply voltage VCC, the resistor R7 is used for voltage input of the MOS triode Q1, and the MOS triode Q1 is used for disconnecting the R pin and the W pin after power-on and connecting the R pin and the W pin after power-off, so as to ensure voltage balance between the two ends.

[0036] The temperature monitoring module is connected with the power supply voltage VCC and the AD_TEMP pin of the MCU chip U3, and includes an NTC resistor R20, a capacitor C15 connected in parallel with the NTC resistor R20, and a resistor R19 connected in series between the NTC resistor R20 and the power supply voltage VCC. Figure 6

[0037] The interface module includes ESD chips U6 and U7, wiring terminals J1, J2 and J3, travel switches SW1 and SW2, and an on-board indicator lamp. Figure 7 The ESD chips U6 and U7 are used for protecting the system from static electricity; the wiring terminal J1 is a system digital signal output interface, the wiring terminal J2 is a system serial data communication interface with an external device, and the wiring terminal J3 is a system program burning interface; the travel switches SW1 and SW2 are used for monitoring system sensor shedding, the positive electrode of the travel switch SW1 is connected with the power supply voltage VCC and the DI1 pin of the MCU chip U3, the negative electrode is grounded, a resistor R27 is connected in series between the positive electrode and the power supply voltage VCC, and a capacitor C22 is connected in series between the positive electrode and the negative electrode; the positive electrode of the travel switch SW2 is connected with the power supply voltage VCC and the DI2 pin of the MCU chip U3, the negative electrode is grounded, a resistor R28 is connected in series between the positive electrode and the power supply voltage VCC, and a capacitor C23 is connected in series between the positive electrode and the negative electrode; when the system is online, the travel switches SW1 and SW2 are pressed down, the DI1 and DI2 pins of the MCU chip U3 input low voltage (GND), if the system sensor is shedded, the DI1 and DI2 pins of the MCU chip U3 are connected with the power supply through the resistors R27 and R28, so as to be high voltage (VCC), and the capacitors C22 and C23 are responsible for system sensor shedding signal filtering processing; the on-board indicator lamp includes an LED lamp, a resistor R31 is connected in series between the LED lamp and the LED pin of the MCU chip U3, and the resistor R31 provides current-limiting input for the LED lamp.

[0038] The monitoring system provided in the embodiment has four working states, i.e., a normal monitoring state, a hydrogen concentration over-limit state, a carbon monoxide concentration over-limit state and a fault state, and the four working states are as follows:​

[0039] Normal monitoring state: in the normal power supply working state of the system, the sensor module converts the monitored gas concentration into an electrical signal recognizable by the MCU module, the MCU module converts the collected electrical signal into a gas concentration, compares it with the preset threshold value, and outputs the concentration signal in real time to the external device through the interface module.

[0040] Hydrogen concentration over-limit state: when the MCU module monitors that the hydrogen concentration exceeds the preset threshold value, the DO1 pin of the MCU chip outputs a signal and controls the onboard indicator light LED to flash to prompt, and the hydrogen concentration signal is output in real time to the external device through the interface module.

[0041] Carbon monoxide concentration over-limit state: when the MCU module monitors that the carbon monoxide concentration exceeds the preset threshold value, the DO2 pin of the MCU chip outputs a signal and controls the onboard indicator light LED to flash to prompt, and the carbon monoxide concentration signal is output in real time to the external device through the interface module.

[0042] Fault state: when the MCU module monitors that the hydrogen sensor or the carbon monoxide sensor has expired or fallen off, etc., the DO2 pin of the MCU chip outputs a signal and controls the onboard indicator light LED to always on to prompt, and the fault signal is output in real time to the external device through the interface module.

[0043] The monitoring system of the utility model, through integration hydrogen monitoring module, carbon monoxide monitoring module carry out hydrogen and carbon monoxide concentration monitoring in environment, realize hydrogen and carbon monoxide two-in-one gas monitoring;Multi-state output, support sensor drop detection, life monitoring, high sensitivity, strong anti-interference ability;The cost is lower, practical chip and sensor of production, self-controlling, conducive to mass production;Small size, convenient to install and turnover.

[0044] The above examples are only used to illustrate the technical solutions of the utility model, but not to limit them;Ordinary skilled person in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features;And these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the utility model.

Claims

1. A hydrogen and carbon monoxide composite gas monitoring system, characterized in that: include: The power module is responsible for voltage conversion, realizing wide voltage input and power supply voltage VCC and reference voltage Vref output; The MCU module is connected to the power module, sensor module, and interface module. It is used to collect data from the sensor module, calculate the gas concentration based on the collected data, and compare it with the preset gas concentration threshold. Based on the comparison result, the output terminal is controlled to output a corresponding signal. The output terminal is also controlled to communicate with external devices in real time to transmit environmental gas concentration and module status information. The sensor module is connected to the power module and the MCU module, and includes a hydrogen monitoring module, a carbon monoxide monitoring module, and a temperature monitoring module. The hydrogen monitoring module is responsible for real-time monitoring of hydrogen concentration and converts the hydrogen concentration into a voltage signal for acquisition by the MCU; the carbon monoxide monitoring module is responsible for real-time monitoring of carbon monoxide concentration and converts the carbon monoxide concentration into a voltage signal for acquisition by the MCU; the temperature monitoring module is responsible for collecting ambient temperature and converts the temperature signal into a voltage signal for acquisition by the MCU; Interface module: connected to the MCU module, output terminal and input terminal, responsible for MCU program burning and status signal output.

2. The hydrogen and carbon monoxide combined gas monitoring system according to claim 1, wherein: The power supply module includes a voltage conversion chip U1, which has an input port Vin, a ground port GND and an output port Vout. The input port Vin is connected to an external power supply VDD, and the output port Vout is respectively connected to the power supply voltage VCC port, the reference voltage Vref port and the ground terminal of the power supply module. A capacitor C19 is connected in series between the input port Vin and the ground, a capacitor C3 is connected in series between the output port Vout and the ground, and a capacitor C4 is connected in parallel to the capacitor C3. A resistor R17 is connected in series between the output port Vout and the reference voltage Vref port, and a resistor R18 is also connected in series between the output port Vout and the ground terminal of the power supply module. A resistor R22 and a capacitor C16 are connected in parallel to the resistor R18.

3. The hydrogen and carbon monoxide combined gas monitoring system according to claim 2, wherein: The MCU module is connected to the power supply voltage VCC, and includes an MCU chip U3. The MCU chip U3 has an AD_CO pin, a DO3 pin, a DO2 pin, a RESET pin, an AD_H2 pin, a DO1 pin, a VCAP pin, a VDCC pin, a DI1 pin, an LED pin, a SWCLK pin, a SWDIO pin, an AD_TEMP pin, a DI2 pin, a U0_TXD pin and a U0_RXD pin, wherein a resistor R9 is connected in series between the RESET pin and the power supply voltage VCC, a capacitor C7 is connected in series between the RESET pin and the ground, a capacitor C9 is connected in series between the VCAP pin and the ground, a capacitor C10 is connected in parallel to the capacitor C9, a capacitor C11 is connected in series between the VDCC pin and the ground, and a capacitor C12 is connected in parallel to the capacitor C11.

4. The hydrogen and carbon monoxide combined gas monitoring system according to claim 3, wherein: The hydrogen monitoring module is connected to the power supply voltage VCC, the reference voltage Vref and the AD_H2 pin of the MCU chip U3, and includes a hydrogen sensor SE2. The hydrogen sensor SE2 has a W pin, a C pin and an R pin, wherein a resistor R23 is connected in series between the R pin and the C pin, and a capacitor C17 is connected in parallel to the resistor R23. A first amplifier circuit is formed between the R pin and the reference voltage Vref through an operational amplifier U8A, and the output end of the first amplifier circuit is connected to the C pin; a second amplifier circuit is formed between the W pin and the reference voltage Vref through an operational amplifier U8B, and the output end of the second amplifier circuit is connected to the AD_H2 pin of the MCU chip U3, and an RC filter is also connected between the output end of the second amplifier circuit and the AD_H2 pin of the MCU chip U3; a MOS transistor Q2 is connected in series between the W pin and the R pin, the source of the MOS transistor Q2 is connected to the power supply voltage VCC, and a resistor R21 is connected in series between the source of the MOS transistor Q2 and the power supply voltage VCC.

5. The hydrogen and carbon monoxide combined gas monitoring system according to claim 4, wherein: The first amplifier circuit includes an operational amplifier U8A, the non-inverting input terminal of the operational amplifier U8A is connected to the reference voltage Vref and the ground, a resistor R25 is connected in series between the operational amplifier U8A and the reference voltage Vref, and a capacitor C26 is connected in series between the operational amplifier U8A and the ground; the second amplifier circuit includes an operational amplifier U8B, the non-inverting input terminal of the operational amplifier U8B is connected to the reference voltage Vref, a resistor R16 is connected in series between the operational amplifier U8B and the reference voltage Vref, and a reverse input terminal of the operational amplifier U8B is connected to the reference voltage Vref. Connected to the W pin, a resistor R14 is connected in series between the inverting input terminal of the operational amplifier U8B and the W pin, and a resistor R12, a resistor R13 and a capacitor C13 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U8B; the RC filter includes resistors R15, R30 and capacitors C14, C30, the resistors R15 and R30 are connected in series between the output terminal of the operational amplifier U8B and the AD_H2 pin of the MCU chip U3, the capacitor C14 is connected in series between the resistor R15 and the ground, and the capacitor C21 is connected in series between the resistor R30 and the ground.

6. The hydrogen and carbon monoxide combined gas monitoring system according to claim 3, wherein: The carbon monoxide monitoring module is connected to the power supply voltage VCC, the reference voltage Vref and the AD_CO pin of the MCU chip U3, and includes a carbon monoxide sensor SE1. The carbon monoxide sensor SE1 has a W pin, a C pin and an R pin, wherein a resistor R8 is connected in series between the R pin and the C pin, and a capacitor C6 is connected in parallel to the resistor R8. A third amplifier circuit is formed between the R pin and the reference voltage Vref through an operational amplifier U4B, and the output end of the third amplifier circuit is connected to the C pin; a fourth amplifier circuit is formed between the W pin and the reference voltage Vref through an operational amplifier U4A, and the output end of the fourth amplifier circuit is connected to the AD_CO pin of the MCU chip U3. An RC filter is also connected between the output end of the fourth amplifier circuit and the AD_CO pin of the MCU chip U3; a MOS transistor Q1 is connected in series between the W pin and the R pin, the source of the MOS transistor Q1 is connected to the power supply voltage VCC, and a resistor R7 is connected in series between the source of the MOS transistor Q1 and the power supply voltage VCC.

7. The hydrogen and carbon monoxide combined gas monitoring system according to claim 6, wherein: The third amplifier circuit includes an operational amplifier U4B, the non-inverting input terminal of the operational amplifier U4B is connected to the reference voltage Vref and the ground, a resistor R11 is connected in series between the operational amplifier U4B and the reference voltage Vref, and a capacitor C25 is connected in series between the operational amplifier U4B and the ground; the fourth amplifier circuit includes an operational amplifier U4A, the non-inverting input terminal of the operational amplifier U4A is connected to the reference voltage Vref, a resistor R6 is connected in series between the operational amplifier U4A and the reference voltage Vref, the inverting input terminal of the operational amplifier U4A is connected to the W pin, a resistor R3 is connected in series between the inverting input terminal of the operational amplifier U4A and the W pin, and a resistor R1, a resistor R2 and a capacitor C1 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U4A; the RC filter includes resistors R5, R20 and capacitors C5, C24, the resistors R5 and R20 are connected in series between the output terminal of the operational amplifier U4A and the AD_CO pin of the MCU chip U3, the capacitor C5 is connected in series between the resistor R5 and the ground, and the capacitor C24 is connected in series between the resistor R20 and the ground.

8. The hydrogen and carbon monoxide combined gas monitoring system according to claim 3, wherein: The temperature monitoring module is connected to the power supply voltage VCC and the AD_TEMP pin of the MCU chip U3, and includes an NTC resistor R20, a capacitor C15 is connected in parallel to the NTC resistor R20, and a resistor R19 is connected in series between the NTC resistor R20 and the power supply voltage VCC.

9. The hydrogen and carbon monoxide combined gas monitoring system according to claim 3, wherein: The interface module includes ESD chips U6, U7, terminal blocks J1, J2, J3, limit switches SW1, SW2 and onboard indicator lights. The ESD chips U6 and U7 are used to protect the system from static electricity, the terminal block J1 is the system digital signal output interface, the terminal block J2 is the system and external device serial data communication interface, and the terminal block J3 is the system program burning interface; the limit switches SW1 and SW2 are used for system sensor shedding monitoring.

10. The hydrogen and carbon monoxide combined gas monitoring system according to claim 9, wherein: The onboard indicator light includes an LED lamp, and a resistor R31 is connected in series between the LED lamp and the LED pin of the MCU chip U3.

Images