Low-power-consumption combustible gas alarm

Abstract

The invention discloses a low-power-consumption combustible gas alarm device, and relates to the technical field of environment monitoring, and the device comprises a gas sensor module which is used for detecting the content of combustible gas; the main control module is used for processing the gas content detection signal of the gas sensor module and generating processing information; the display module is used for controlling sound-light alarm according to the processing information; the communication module is used for data communication between the main control module and a remote monitoring platform; the power management module is used for supplying power to the power management module, the gas sensor module, the communication module and the display module; the gas sensor module is connected with the main control module, the power management module is connected with the main control module, and the main control module is connected with the communication module and the display module. According to the invention, sleep and wake-up are alternately carried out through the PWM mode of the main control module, and low-power-consumption monitoring control is realized through alternation of the sleep mode and the wake-up mode.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and particularly to a low-power combustible gas alarm. Background Art

[0002] A combustible gas alarm is a detector that responds to the concentration of single or multiple combustible gases. Its principle is that when a combustible gas enters the detector, an oxidation reaction is caused on the surface of the platinum wire inside the gas-sensitive resistor, which raises the temperature of the platinum wire, and the resistivity of the platinum wire will change. Different resistance changes with different temperature coefficients will show different situations. For example, a negative temperature coefficient thermistor decreases its resistance value as the temperature rises, and vice versa.

[0003] The wireless communicator is in a continuous data sending state. However, under normal circumstances, the concentration of combustible gas is relatively low. Even if the background monitoring device receives gas data with a relatively low concentration of combustible gas, since the gas data with a relatively low concentration of combustible gas is normal data, the normal data has little effect. Only when receiving combustible gas data with a higher concentration can the background monitoring device perform relevant data processing based on the combustible gas data with a higher concentration. However, regardless of whether the concentration of combustible gas is high or low, the wireless communicator is in a continuous data sending state, resulting in relatively high energy consumption.

[0004] Currently, gas alarms on the market all adopt a continuous power supply method for the sensor, keeping the sensor in a high-power state and continuously detecting the gas concentration in the environment. This method consumes a large amount of electric energy (more than 300 mW), so it is impossible to achieve long-term operation (more than 1 year) using battery power. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies in the prior art and design a low-power combustible gas alarm.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0007] The present invention provides a low-power combustible gas alarm, including:

[0008] A gas sensor module for detecting the content of combustible gas;

[0009] A main control module for processing the gas content detection signal of the gas sensor module and generating a processing message;

[0010] A display module for controlling audible and visual alarms according to the processing message;

[0011] A communication module for data communication between the main control module and a remote monitoring platform;

[0012] A power management module for supplying power to the power management module, gas sensor module, communication module, and display module;

[0013] The gas sensor module is connected to the main control module, the power management module is connected to the main control module, and the main control module is connected to the communication module and the display module.

[0014] As a further technical solution of the present invention, the gas sensor module includes:

[0015] A gas sensor, a filter circuit, an amplifier circuit, and a voltage stabilizing circuit. The output end of the voltage stabilizing circuit is connected to the gas sensor, the output end of the gas sensor is connected to the filter circuit, the output end of the filter circuit is connected to the amplifier circuit, and the output end of the amplifier circuit is connected to the main control module.

[0016] As a further technical solution of the present invention, the amplifier circuit is an operational amplifier of model RS8051XF, and the voltage stabilizing circuit is a voltage regulator of model ME6211C25M5G.

[0017] As a further technical solution of the present invention, the communication module includes a first communication module and a second communication module. The first communication module is a 433M wireless transceiver module, and the second communication module is a 4G module based on an LTE Cat.1 chip.

[0018] As a further technical solution of the present invention, the power management module includes: a battery, a first voltage conversion module, a second voltage conversion module, a third voltage conversion module, and a fourth voltage conversion module;

[0019] The first voltage conversion module is a 6V to 3.3V voltage module for supplying power to the main control module;

[0020] The second voltage conversion module is a 6V to 3.3V voltage module for supplying power to the first communication module;

[0021] The third voltage conversion module is a 6V to 3.3V voltage module for supplying power to the second communication module;

[0022] The fourth voltage conversion module is a 6V to 3.3V voltage module for supplying power to the display module.

[0023] As a further technical solution of the present invention, the 433M wireless transceiver module is a radio frequency transceiver signal of model CMT2300A, and the 433M wireless transceiver module is connected to a spring antenna.

[0024] As a further technical solution of the present invention, the display module includes a first indicator light, a second indicator light, a third indicator light, and a buzzer.

[0025] As a further technical solution of the present invention, the main control module is an HC32L196KCTA-LQFP64 ultra-low power consumption single-chip microcomputer.

[0026] As a further technical solution of the present invention, the main control module is also connected to a clock RTC module, and the clock RTC module is an SD8563-TSSOP clock chip.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention controls the alternation of sleep and wake-up through the PWM mode of the main control module. Under normal circumstances, the main control module is in the sleep mode. When the gas sensor module detects that the gas content reaches the set threshold, it enters the wake-up mode; through the alternation of the sleep mode and the wake-up mode, low-power monitoring and control are realized. Description of the Drawings

[0029] Figure 1 It is a structural diagram of a low-power combustible gas alarm proposed by the present invention;

[0030] Figure 2 It is a control structure diagram of a low-power combustible gas alarm proposed by the present invention;

[0031] Figure 3 It is a filter circuit diagram proposed by the present invention;

[0032] Figure 4 It is an amplifier circuit diagram proposed by the present invention;

[0033] Figure 5 It is a voltage stabilizing circuit diagram proposed by the present invention;

[0034] Figure 6 It is a 433M wireless transceiver module circuit diagram proposed by the present invention;

[0035] Figure 7 It is a 4G module circuit diagram proposed by the present invention;

[0036] Figure 8 It is a battery circuit structure diagram proposed by the present invention;

[0037] Figure 9 It is a first voltage conversion module circuit diagram proposed by the present invention;

[0038] Figure 10 It is a second voltage conversion module circuit diagram proposed by the present invention;

[0039] Figure 11 It is a third voltage conversion module circuit diagram proposed by the present invention;

[0040] Figure 12Circuit diagram of the fourth voltage conversion module proposed by the present invention;

[0041] Figure 13 Circuit diagram of the main control module proposed by the present invention;

[0042] Figure 14 Circuit diagram of the clock RTC module proposed by the present invention;

[0043] Figure 15 Control flow chart of a low-power combustible gas alarm proposed by the present invention. Specific embodiments

[0044] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings and embodiments:

[0045] It should be noted that the structures, colors, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0046] At the same time, the terms such as "first", "second", "third", "fourth", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0047] As Figures 1 - 2 shown, the present invention provides a low-power combustible gas alarm, including:

[0048] A gas sensor module for detecting the content of combustible gas;

[0049] A main control module for processing the gas content detection signal of the gas sensor module and generating a processing message;

[0050] A display module for controlling audible and visual alarms according to the processing message;

[0051] A communication module for data communication between the main control module and a remote monitoring platform;

[0052] A power management module for supplying power to the power management module, the gas sensor module, the communication module and the display module;

[0053] The gas sensor module is connected to the main control module, the power management module is connected to the main control module, and the main control module is connected to the communication module and the display module.

[0054] In the gas sensor module of the present invention, the gas sensor is a catalytic combustion type gas sensor. Utilizing the thermal effect principle of catalytic combustion, a measurement bridge is formed by pairing a detection element and a compensation element. Under certain temperature conditions, the combustible gas undergoes flameless combustion on the surface of the detection element carrier and under the action of the catalyst, the carrier temperature rises, and the resistance of the internal detection element also increases accordingly, thus causing the balanced bridge to lose balance and output an electrical signal proportional to the concentration of the combustible gas. The main control module controls the alternation of sleep and wake-up in PWM mode. Under normal circumstances, the main control module is in the sleep mode. When the gas sensor module detects that the gas content reaches the set threshold, it enters the wake-up mode; through the alternation of the sleep mode and the wake-up mode, low-power monitoring and control are realized.

[0055] See Figures 3 - 5 , the gas sensor module includes: a gas sensor, a filtering circuit, an amplifying circuit, and a voltage stabilizing circuit. The output end of the voltage stabilizing circuit is connected to the gas sensor, the output end of the gas sensor is connected to the filtering circuit, the output end of the filtering circuit is connected to the amplifying circuit, and the output end of the said amplifying circuit is connected to the main control module.

[0056] The gas sensor module detects the combustible gas through the gas sensor, and processes the detection signal through the filtering circuit, amplifying circuit, and voltage stabilizing circuit and outputs it to the main control module.

[0057] Among them, the amplifying circuit is an operational amplifier of model RS8051XF, and the voltage stabilizing circuit is a voltage regulator of model ME6211C25M5G. The voltage regulator of model ME6211C25M5G regulates the 5V voltage and outputs 2.5V voltage. The voltage regulator of model ME6211C25M5G is a linear voltage regulator with high precision and low noise CMOS LDO voltage regulator. The ME6211 series provides low output noise, high ripple rejection rate, low dropout rate, and very fast turn-on time. The ME6211 internally includes a reference voltage source, an error amplifier, a driving transistor, a current limiter, and a phase compensator. The folded circuit of the current limiter of ME6211 can also be used as an output current limiter and short-circuit protection. The ME6211 series is also fully compatible with low ESR ceramic capacitors, reducing costs, improving output stability, remaining unchanged during frequent load fluctuations, achieving good transient response performance and high PSRR in a wide frequency range; the CE function allows the output of the regulator to be turned off, thus greatly reducing power consumption.

[0058] See Figures 6 - 7 , the communication module includes a first communication module and a second communication module, where the first communication module is a 433M wireless transceiver module, and the second communication module is a 4G module based on an LTE Cat.1 chip.

[0059] See Figures 8 - 12, the management module includes: a battery, a first voltage conversion module, a second voltage conversion module, a third voltage conversion module, and a fourth voltage conversion module;

[0060] The first voltage conversion module is a 6V to 3.3V voltage module for powering the main control module;

[0061] The second voltage conversion module is a 6V to 3.3V voltage module for powering the first communication module;

[0062] The third voltage conversion module is a 6V to 3.3V voltage module for powering the second communication module.

[0063] The fourth voltage conversion module is a 6V to 3.3V voltage module for powering the display module;

[0064] The battery uses 4 dry batteries in series as a 6V power supply, which is converted to 3.3V voltage through the first voltage conversion module, the second voltage conversion module, the third voltage conversion module, and the fourth voltage conversion module to power the main control module, the first communication module, the second communication module, and the display module.

[0065] In the embodiment of the present invention, the wireless module is a radio frequency transceiver signal of the CMT2300A model. It has characteristics such as low power consumption, high sensitivity, and high transmission power, and the wireless module is connected to a spring antenna.

[0066] The wireless module NT26E adopts a highly integrated design scheme, integrating radio frequency and baseband on a single PCB to complete the functions of receiving, transmitting, and baseband signal processing of radio frequency signals, and using an LCC+LGA interface externally

[0067] The display module in the embodiment of the present invention includes a first indicator light, a second indicator light, a third indicator light, and a buzzer. The first indicator light, the second indicator light, and the third indicator light are a green light, a red light, and a green and red flashing light respectively, which are used to indicate the sleep state, the wake-up state, and the alarm respectively.

[0068] See Figure 13 , the main control module is an HC32L196KCTA-LQFP64 ultra-low power consumption single-chip microcomputer. See Figure 14 , the clock RTC module is an SD8563-TSSOP clock chip, and the SD8563-TSSOP is a real-time clock chip with a standard IIC interface.

[0069] The present invention adopts the "pulse power supply + supercapacitor discharge" method, and the process is as follows:

[0070] After power-on, it is connected to supply power to the sensor module for 5 minutes. After that, the supercapacitor is fully charged and the sensor temperature reaches stability, and then it switches to the pulse power supply mode (the sensor power consumption is reduced to less than 2mW);

[0071] When power is off, the super capacitor discharges to supply power to the sensor (to keep the temperature stable).

[0072] When power is supplied, the voltage value of the sensor is collected. If the voltage changes continuously (about 5 seconds) (there is gas leakage in the environment), it immediately enters the continuous power supply mode (the alarm enters the detection state). After a 10-second delay, the signal is collected again. If the alarm point is reached, the alarm gives an alarm prompt. (Specifically refer to the above flowchart).

[0073] And the collected data is processed by algorithms each time to solve the problem of insufficient sensor stability (compared with the continuous power supply method) due to pulsed power supply. The specific algorithms are as follows: moving average algorithm, concentration data compensation algorithm (using the sensor curve of continuous power supply to compensate the pulsed power supply curve), etc.

[0074] Sleep and wake-up alternate. The specific process is as follows:

[0075] Sleep: Enable the ultra-low power timer (wake up the main control once per second), turn off all function modules, and the main control enters the sleep mode. At this time, the working current is about 20uA.

[0076] Wake-up: After waking up, the main control mainly executes the following logic in a loop for 100ms. At this time, the working current is about 50mA. After completion, it immediately enters the "sleep" mode again:

[0077] Turn on and configure the 433M chip and the CAT1 module.

[0078] Judge whether there is data (heartbeat packet) to be sent. If so, send the data through the 433 or CAT1 module and wait for the response.

[0079] Turn on the environmental gas detection and execute according to the "low-power detection implementation low-power process".

[0080] See Figure 15 , the specific implementation process of the present invention is as follows:

[0081] When the system is powered on, the gas sensor is preheated for 5 minutes, and low-voltage power supply, heat preservation and detection are turned on. If the environmental gas concentration is normal, continue with low-voltage power supply, heat preservation and detection. If the environmental gas concentration is abnormal, normal voltage power supply is carried out, and the environmental concentration is continuously detected. When the environmental concentration reaches the alarm point, an alarm is given and reported to close the valve. When the alarm point is not reached or when the alarm duration reaches 2 minutes, it is converted to low-voltage power supply.

[0082] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-power flammable gas alarm, characterized in that: include: Gas sensor module, used to detect the combustible gas content; A main control module, used to process the gas content detection signal of the gas sensor module and generate processing information; A display module for controlling sound and light alarms according to the processed information; Communication module, used for data communication between the main control module and the remote monitoring platform; A power management module, used to supply power to the power management module, the gas sensor module, the communication module and the display module; The gas sensor module is connected to the main control module, the power management module is connected to the main control module, and the main control module is connected to the communication module and the display module.

2. A low-power flammable gas alarm according to claim 1, characterized in that: The gas sensor module comprises: A gas sensor, a filter circuit, an amplifier circuit and a voltage stabilizing circuit, wherein the output end of the voltage stabilizing circuit is connected to the gas sensor, the output end of the gas sensor is connected to the filter circuit, the output end of the filter circuit is connected to the amplifier circuit, and the output end of the amplifier circuit is connected to the main control module.

3. A low-power flammable gas alarm according to claim 2, characterized in that: The amplifying circuit is an operational amplifier of model RS8051XF, and the voltage stabilizing circuit is a voltage regulator of model ME6211C25M5G.

4. A low-power flammable gas alarm according to claim 1, characterized in that: The communication module includes a first communication module and a second communication module, wherein the first communication module is a 433M wireless transceiver module, and the second communication module is a 4G module based on an LTE Cat.1 chip.

5. A low-power flammable gas alarm according to claim 1, characterized in that: The power management module includes: a battery, a first voltage conversion module, a second voltage conversion module, a third voltage conversion module, and a fourth voltage conversion module; The first voltage conversion module is a 6V to 3.3V voltage module, which is used to power the main control module; The second voltage conversion module is a 6V to 3.3V voltage conversion module, which is used to power the first communication module; The third voltage conversion module is a 6V to 3.3V voltage conversion module, which is used to power the second communication module; The fourth voltage conversion module is a 6V to 3.3V voltage conversion module, which is used to supply power to the display module.

6. A low-power consumption combustible gas alarm according to claim 4, characterized in that: The 433M wireless transceiver module is a CMT2300A model radio frequency transceiver signal, and the 433M wireless transceiver module is connected to the spring antenna.

7. A low-power flammable gas alarm according to claim 1, characterized in that: The display module includes a first indicator light, a second indicator light, a third indicator light and a buzzer.

8. A low-power flammable gas alarm according to claim 1, characterized in that: The main control module is a HC32L196KCTA-LQFP64 ultra-low power consumption single chip microcomputer.

9. A low-power consumption combustible gas alarm according to claim 1, characterized in that: The main control module is also connected to a clock RTC module, and the clock RTC module is a SD8563-TSSOP clock chip.

Images