Household gas alarm adopting long wave to receive clock information

Abstract

The utility model relates to the field of gas alarms, and discloses a household gas alarm adopting long waves to receive clock information, which comprises an alarm body. The radio receiving module is arranged in the alarm body and is used for receiving a low-frequency radio time code signal; and the control and mediation module is arranged in the alarm body, the control and mediation module comprises an alarm MCU (Microprogrammed Control Unit), and the alarm MCU operates a soft RTC (Real Time Clock). The radio receiving module is electrically connected with the control mediation module, and the control mediation module is used for mediating the low-frequency radio time code signal received by the wireless receiving module, obtaining clock information from the demodulated low-frequency radio time code signal and endowing the clock information to the soft RTC.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas alarm, in particular to a household gas alarm receiving clock information by long wave. BACKGROUND

[0002] With the increasing popularity of gas application, gas alarm as an important safety detection device has been widely used. Since gas accidents are sudden, in order to effectively trace the cause of the accident, relevant standards require gas alarm to have historical data recording function, and the accuracy of clock information is crucial. However, in the design of household gas alarm, there is usually only a status indicator light to display the device status, lacking a display and keys for displaying clock information and performing complex operations, which makes it difficult to verify the accuracy of the internal clock of the alarm.

[0003] To solve this problem, the gas alarm in the prior art usually uses a special clock RTC chip, and a button cell is built-in to ensure that the clock can continue to run without external power supply. The initial calibration of the clock is usually performed during factory production. For gas alarms with networking function, clock calibration can be performed through the network. However, for the currently widely used non-networked gas alarms, clock calibration cannot be performed during subsequent use. For gas alarms with a service life of 5 years, 8 years or even 10 years, not performing clock calibration will cause the timing error to gradually increase, and once the battery runs out, all data will become inaccurate. Although using a large capacity and low consumption type long life battery can solve this problem, the cost pressure is greater. Therefore, how to ensure the accuracy of clock information while reducing cost is an important challenge faced by current gas alarm design. CONTENT OF THE INVENTION

[0004] In order to alleviate the problem that the accuracy of gas alarm clock information and low cost cannot coexist, the present application provides a household gas alarm receiving clock information by long wave.

[0005] The household gas alarm receiving clock information by long wave provided by the present application adopts the following technical solution:

[0006] The alarm body;

[0007] The wireless radio receiving module is arranged in the alarm body and is used for receiving low-frequency wireless radio time code signal;

[0008] A control mediation module is arranged in the alarm body, the control mediation module comprises an alarm MCU, the alarm MCU runs a soft RTC, the radio receiving module is electrically connected with the control mediation module, and the control mediation module is used for mediating the low-frequency radio time code signal received by the radio receiving module and obtaining clock information from the mediated low-frequency radio time code signal to give the soft RTC.

[0009] By adopting the technical scheme, the radio receiving module is arranged in the alarm body, the household gas alarm can receive the low-frequency radio time code signal sent by the national time center, the special integrated chip mediates the received time code signal accurately, the accuracy and reliability of the signal are ensured, and the signal carries accurate time information. The alarm MCU in the control mediation module runs a software real-time clock (soft RTC), which receives and mediates the time code signal through electrical connection with the radio receiving module, and then extracts clock information from the time code signal to update the soft RTC, so that the accuracy of the clock information of all alarms receiving the standard time signal is realized. Not only the clock adjustment of the alarm in the use process is avoided, but also the operation difficulty and maintenance cost of the user are greatly reduced, the use of a special clock chip and a special battery required for maintaining the operation of the clock chip is avoided, the structure of the alarm is further simplified, and the production cost is reduced. At the same time, the time calibration is realized many times a day, the continuous accuracy of the time information is ensured, and more reliable and safe gas monitoring services are provided for the user.

[0010] Preferably, the radio receiving module comprises a receiving antenna and a receiving integrated circuit, and the receiving integrated circuit is electrically connected with the control mediation module.

[0011] By adopting the technical scheme, the receiving antenna is responsible for efficiently capturing the low-frequency radio time code signal broadcast by the national time center, and stable reception of the signal is ensured. The receiving integrated circuit then performs preliminary processing and amplification on the received signal, and then realizes electrical connection with the control mediation module, and transmits the processed signal to the control mediation module for further mediation. Not only the clock accuracy of the alarm is improved, but also the use of a special clock chip and a battery is avoided, the cost is reduced, and the continuous accuracy of the time information is realized, so that the user can have a more reliable and efficient gas monitoring experience.

[0012] Preferably, the receiving antenna adopts a magnetic rod coil.

[0013] By adopting the technical scheme, the magnetic rod coil antenna has good frequency response and high sensitivity, and can efficiently receive the low-frequency radio time code signal broadcast by the national time center.

[0014] Preferably, the receiving integrated circuit comprises a preamplifier, a tuned amplifier, an automatic gain circuit, a filter, a detector, a demodulator and a square wave generator, the preamplifier, the tuned amplifier, the filter, the detector and the demodulator are connected in series, the automatic gain circuit is connected in parallel with the tuned amplifier, and the square wave generator is connected in parallel with the demodulator.

[0015] By adopting the above technical scheme, the preamplifier preliminarily amplifies the weak signal captured by the receiving antenna, enhances the strength of the signal, and provides a better foundation for subsequent processing. Then, the tuned amplifier performs frequency selection and amplification on the signal, ensures that only signals of a specific frequency are effectively amplified, and filters out interference of other irrelevant frequencies, thereby improving the signal-to-noise ratio of the signal. The automatic gain circuit automatically adjusts the gain of the amplifier according to the strength of the input signal, ensures that the voltage or power of the output signal remains constant or basically unchanged under different signal strengths, and further enhances the stability and reliability of the system.

[0016] Preferably, the control mediation module comprises a decoding chip, the decoding chip is electrically connected with the receiving integrated circuit, and the decoding chip is electrically connected with the alarm MCU.

[0017] By adopting the above technical scheme, through the cooperative work of the decoding chip and the alarm MCU, accurate reception and processing of the standard time signal are realized, the accuracy of the alarm clock is ensured, and the overall performance and reliability of the alarm are improved.

[0018] Preferably, the decoding chip adopts a CME6005 chip, which is used to receive the low-frequency radio time code signal sent by the receiving integrated circuit and decode and process the low-frequency radio time code signal.

[0019] By adopting the above technical scheme, the CME6005 decoding chip receives the signal from the receiving integrated circuit and decodes and processes it. Since CME6005 has high sensitivity, it can receive weak time signals and restore them to the original standard time signals. In this process, the dual-frequency crystal compensation function of CME6005 plays a key role, which ensures the stability of the chip at different frequencies, thereby improving the accuracy of time signal reception and decoding.

[0020] Preferably, the control mediation module further comprises a verification unit, the verification unit is electrically connected with the alarm MCU, and the verification unit is used to verify the mediated low-frequency radio time code signal.

[0021] By adopting the technical scheme, the check unit is additionally arranged, the receiving and processing accuracy of the time signal is improved, and the stability and reliability of the system are enhanced. Even in a complex electromagnetic environment, the alarm can keep the clock accurate and provide more reliable time reference and gas monitoring service for users.

[0022] Preferably, the household gas alarm receiving clock information by long wave further comprises a power supply module, which is connected with the control and mediation module and the radio receiving module, and is used for supplying power for the control and mediation module and the radio receiving module.

[0023] By adopting the technical scheme, the power supply module can stably supply power for the control and mediation module and the radio receiving module, and ensure that they can continuously and reliably work.

[0024] In summary, the present application at least has the following beneficial technical effects:

[0025] 1. By arranging the radio receiving module in the alarm body, the household gas alarm can receive the low-frequency radio time code signal sent by the national time center, and the special integrated chip accurately mediates the received time code signal, ensuring the accuracy and reliability of the signal, which carries accurate time information. The alarm MCU in the control and mediation module runs the software real-time clock (soft RTC), which receives and mediates the time code signal through electrical connection with the radio receiving module, and then extracts the clock information from the time code signal to update the soft RTC, so that the accuracy and error of the clock information of all alarms receiving the standard time signal are realized. Not only the clock adjustment work of the alarm in the use process is avoided, but also the operation difficulty and maintenance cost of the user are greatly reduced, and the use of special clock chip and special battery required for maintaining the operation of the clock chip is avoided, further simplifying the structure of the alarm and reducing the production cost. At the same time, the time calibration is realized many times a day, ensuring the continuous accuracy of the time information, and providing more reliable and safe gas monitoring service for users;

[0026] 2. The receiving antenna is responsible for efficiently capturing the low-frequency radio time code signal broadcast by the national time center, ensuring stable reception of the signal. The receiving integrated circuit then performs preliminary processing and amplification on the received signal, and then realizes electrical connection with the control and mediation module, and transmits the processed signal to the control and mediation module for further mediation, which not only improves the clock accuracy of the alarm, but also avoids the use of special clock chip and battery, reduces the cost, and realizes the continuous accuracy of the time information, providing users with more reliable and efficient gas monitoring experience. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1is a structure schematic diagram of a household gas alarm provided by an embodiment of the present application, which adopts long-wave received clock information;

[0028] Figure 2 is a structure schematic diagram of a radio receiving module provided by an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a receiving integrated circuit provided by an embodiment of the present application;

[0030] Figure 4 is a structure schematic diagram of a control mediation module provided by an embodiment of the present application;

[0031] Figure 5 is another structure schematic diagram of a household gas alarm provided by an embodiment of the present application, which adopts long-wave received clock information.

[0032] The figure mark: 100, alarm body; 200, radio receiving module; 300, control mediation module; 400, power supply module; 210, receiving antenna; 220, receiving integrated circuit; 221, preamplifier; 222, tuned amplifier; 223, automatic gain circuit; 224, filter; 225, detector; 226, demodulator; 227, square wave former; 310, decoding chip; 320, alarm MCU; 330, check unit. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying Figure 1 - the accompanying Figure 4 The present application will be further described in detail.

[0034] The present application discloses a household gas alarm which adopts long-wave received clock information.

[0035] Embodiment 1

[0036] Referring to Figure 1 A household gas alarm which adopts long-wave received clock information comprises an alarm body 100, a radio receiving module 200 and a control mediation module 300. Specifically, the radio receiving module 200 is placed in the alarm body 100, the control mediation module 300 comprises an alarm MCU 320, the alarm MCU 320 runs a soft RTC, the radio receiving module 200 is electrically connected with the control mediation module 300, and the control mediation module 300 is used for mediating a low-frequency radio time code signal received by the radio receiving module and obtaining clock information from the mediated low-frequency radio time code signal to give the soft RTC.

[0037] More specifically, the shell material of the alarm body 100 can adopt fireproof, explosion-proof, corrosion-resistant materials such as stainless steel or special plastics, to ensure normal operation and safety in dangerous environments such as gas leakage.

[0038] The radio receiving module 200 can be selected from a receiving module capable of receiving low-frequency radio time code signals, such as receiving long-wave time signal from the national time center (such as BPC in China, WWVB in the United States, etc.). The receiving module is configured according to the frequency range of the selected time code signal.

[0039] The control mediation module 300 can be selected from a low-power, high-performance microcontroller (MCU), such as the ARMCortex-M series, with sufficient RAM and Flash storage for running a software real-time clock (Soft RTC). A software real-time clock program is written on the alarm MCU 320 for maintaining time information without an external hardware RTC. The soft RTC should be able to accurately record the date and time, and be able to automatically calibrate when receiving new clock information. The alarm MCU 320 communicates with the radio receiving module 200 through a serial interface (such as UART, SPI), receives the original time code signal, and uses the built-in digital signal processor (DSP) or software algorithm for demodulation to extract the clock information (such as year, month, day, hour, minute, second). Whenever new clock information is successfully received and demodulated, the alarm MCU 320 updates the time data in the soft RTC.

[0040] The implementation principle of the household gas alarm that receives clock information using long waves in an embodiment of the application is as follows: the low-frequency time code time signal station of the national time center in China was officially launched on April 1, 2002, and the current broadcast time is 9:00-17:00, 21:00-5:00, with a broadcast time of not less than 16 hours per day. The national time center encodes the standard time signal and broadcasts it using a low-frequency (20KHz-80KHz) carrier. The household gas alarm that receives clock information using long waves receives the low-frequency radio time code signal through the built-in radio receiving module 200, the radio receiving module 200 sends the low-frequency radio time code signal to the control mediation module 300, the control mediation module 300 decodes the low-frequency radio time code signal, and the alarm MCU 320 extracts the clock information from the decoded low-frequency radio time code signal and updates the time data in the soft RTC accordingly. Through this technical process, all alarms receiving the standard time signal have accurate and error-free clock information, eliminating the need for clock calibration during use, and eliminating the need for dedicated clock chips and dedicated batteries to maintain the operation of the clock chip. In addition, it can achieve multiple time calibrations per day, ensuring the accuracy of the time information.

[0041] Embodiment 2

[0042] Referring to Figure 2 The radio receiving module 200 comprises a receiving antenna 210 and a receiving integrated circuit 220, and the receiving integrated circuit 220 is electrically connected with the control mediation module 300. Specifically, the receiving antenna 210 can adopt a magnetic rod coil. Referring to Figure 3 The receiving integrated circuit 220 can comprise a preamplifier 221, a tuning amplifier 222, an automatic gain circuit 223, a filter 224, a detector 225, a demodulator 226 and a square wave former 227, the preamplifier 221, the tuning amplifier 222, the filter 224 and the demodulator 226 are connected in sequence, the automatic gain circuit 223 is connected in parallel with the tuning amplifier 222, and the square wave former 227 is connected in parallel with the demodulator 226. More specifically, the preamplifier 221 is connected with the receiving antenna 210, and is used for preliminarily amplifying the code signal received by the receiving antenna 210; the tuning amplifier 222 is connected in series with the preamplifier 221, and is used for selecting and amplifying the code signal; the automatic gain circuit 223 is connected in parallel with the tuning amplifier 222, and is used for automatically adjusting the gain of the tuning amplifier; the filter 224 is connected in series with the tuning amplifier 222, and is used for filtering the code signal; and the detector 225 is connected in series with the filter 224.

[0043] The implementation principle of the household gas alarm adopting the long-wave receiving clock information in the embodiment of the application is as follows: the receiving antenna 210 captures the low-frequency radio time code signal in the air, and sends the low-frequency radio time code signal to the receiving integrated circuit 220; the preamplifier 221 in the receiving integrated circuit 220 preliminarily amplifies the low-frequency radio time code signal; the tuning amplifier 222 further amplifies the low-frequency radio time code signal at a specific frequency, and maintains a stable amplification multiple through the automatic gain circuit 223; the filter 224 filters out the interference signal, and ensures that the signal of the target frequency band passes through; the detector 225 restores the modulated signal to the original signal; and the square wave former 227 converts the demodulated signal into a square wave.

[0044] Embodiment 3

[0045] Referring to Figure 4The control mediation module 300 comprises a decoding chip 310 and a verification unit 330. The decoding chip 310 is electrically connected with the receiving integrated circuit 220 and the alarm MCU 320. Specifically, the decoding chip 310 adopts a CME6005 chip to receive the low-frequency radio time code signal sent by the receiving integrated circuit 220 and to decode the low-frequency radio time code signal. More specifically, the input end of the decoding chip 310 is electrically connected with the output end of the receiving integrated circuit 220, and the output end of the decoding chip 310 is electrically connected with the input end of the alarm MCU 320. The verification unit 330 is connected with the alarm MCU 320 and is used to verify the low-frequency radio time code signal after mediation.

[0046] Further, referring to Figure 5 The household gas alarm using long-wave received clock information further comprises a power supply module 400 connected with the control mediation module 300 and the radio receiving module 200 and used to supply power for the control mediation module 300 and the radio receiving module 200.

[0047] The implementation principle of the household gas alarm using long-wave received clock information is as follows: the power supply module 400 provides power for the control mediation module 300 and the radio receiving module 200; the decoding chip 310 receives the signal processed by the receiving integrated circuit 220 and decodes the signal to restore the original standard time signal; the decoded signal is transmitted to the alarm MCU 320; the verification unit 330 in the alarm MCU 320 verifies the received signal to check whether the signal meets a specific verification rule or algorithm. If the signal passes the verification, the next step is continued; if the verification fails, an error processing mechanism such as re-receiving the signal or issuing a warning prompt is triggered. The verified signal is used to update the soft RTC of the alarm MCU 320 to ensure that the soft RTC is synchronized with the standard time. Since the decoding chip 310 has accurately processed and restored the signal, the alarm MCU 320 can obtain very accurate time information and update the time data in the soft RTC according to the time information. The above is a preferred embodiment of the application, but does not limit the protection scope of the application. Therefore, equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A household gas alarm that uses long waves to receive clock information, characterized in that: include: Alarm body (100); A radio receiving module (200) is placed in the alarm body (100) and is used to receive a low-frequency radio time code signal; A control mediation module (300) is placed in the alarm body (100), the control mediation module (300) includes an alarm MCU (320), the alarm MCU (320) runs a soft RTC, the radio receiving module (200) is electrically connected to the control mediation module (300), and the control mediation module (300) is used to mediate the low-frequency radio time code signal received by the radio receiving module (200), and obtain clock information from the mediated low-frequency radio time code signal and assign it to the soft RTC.

2. The household gas alarm using long wave to receive clock information according to claim 1, characterized in that: The radio receiving module (200) comprises a receiving antenna (210) and a receiving integrated circuit (220), and the receiving integrated circuit (220) is electrically connected to the control and mediation module (300).

3. The household gas alarm using long wave to receive clock information according to claim 2, characterized in that: The receiving antenna (210) adopts a magnetic bar coil.

4. The household gas alarm using long wave to receive clock information according to claim 2, characterized in that: The receiving integrated circuit (220) includes a preamplifier (221), a tuned amplifier (222), an automatic gain circuit (223), a filter (224), a detector (225), a demodulator (226), and a square wave former (227). The preamplifier (221), the tuned amplifier (222), the filter (224), the detector (225), and the demodulator (226) are connected in series in sequence. The automatic gain circuit (223) is connected in parallel with the tuned amplifier (222), and the square wave former (227) is connected in parallel with the demodulator (226).

5. The household gas alarm using long wave to receive clock information according to claim 2, characterized in that: The control mediation module (300) further comprises a decoding chip (310), wherein the decoding chip (310) is electrically connected to the receiving integrated circuit (220), and the decoding chip (310) is electrically connected to the alarm MCU (320).

6. The household gas alarm using long wave to receive clock information according to claim 5, characterized in that: The decoding chip (310) adopts a CME6005 chip, and is used for receiving the low-frequency radio time code signal sent by the receiving integrated circuit (220), and performing decoding processing on the low-frequency radio time code signal.

7. The household gas alarm using long wave to receive clock information according to claim 6, characterized in that: The control mediation module (300) further comprises a verification unit (330), the verification unit (330) being connected to the alarm MCU (320), and the verification unit (330) being used to verify the mediated low-frequency radio time code signal.

8. The household gas alarm using long wave to receive clock information according to claim 1, characterized in that: The household gas alarm using long waves to receive clock information further comprises a power supply module (400), wherein the power supply module (400) is connected to the control and mediation module (300) and the radio receiving module (200) and is used to supply power to the control and mediation module (300) and the radio receiving module (200).

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