LORA wireless explosion-proof fire sound alarm

Abstract

The utility model relates to fire sound alarm technology field discloses a kind of based on LORA wireless explosion-proof fire sound alarm, including alarm main control circuit and the voltage filter circuit, wireless communication circuit and loudspeaker circuit of even electricity with alarm main control circuit, voltage filter circuit is electrically connected with wireless communication circuit and loudspeaker circuit;Voltage filter circuit is alarm main control chip circuit, wireless communication circuit power supply;Wireless communication circuit receives fire alarm signal and is transmitted to alarm main control circuit;Alarm main control circuit receives fire alarm signal, and sends control signal to loudspeaker circuit;Loudspeaker circuit receives control signal, and sends alarm signal;Main control chip supports deep sleep mode, only when receiving fire alarm signal, wake up, in combination with the low power consumption characteristics of LORA communication technology, substantially reduce system energy consumption, suitable for long-term unattended scene;Through DC 24V local power supply mode solves wiring and communication problem, wireless communication distance is far, and anti-interference ability is strong.

Description

Technical Field

[0001] This utility model relates to the field of fire alarm technology, specifically to a LORA-based wireless explosion-proof fire alarm. Background Technology

[0002] The incidence of building fires remains high, primarily due to the inability to detect fire hazards and issue timely warnings. Fire alarms, a commonly used fire alarm device, are specialized equipment that receives control signals to sound a fire alarm, thereby preventing fires, reducing property damage, and protecting lives.

[0003] With economic development, fires cause enormous economic losses to the country and have a significant impact and harm on society. Therefore, how to report fires in a timely, accurate, and error-free manner, and promptly notify relevant departments and personnel, has become a matter of great public concern.

[0004] Traditional fire alarms have two data transmission methods: one uses a bus for data transmission and power supply, and the other uses a bus for signal transmission and DC24V power supply.

[0005] Existing fire alarm systems are divided into two types: fire bus-powered and bus-plus-DC24V. Bus-powered fire alarms involve network installation, resulting in high operating costs. Installation requires extensive wiring, strict isolation between strong and weak currents, and adherence to relevant standards. They also have specific environmental requirements, making the wiring complex. Furthermore, if one alarm malfunctions, extensive troubleshooting is necessary, leading to high installation and repair costs. Additionally, bus-powered alarms suffer from insufficient sound volume due to bus voltage and current limitations, failing to provide a reliable warning. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a LORA-based wireless explosion-proof fire alarm.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A LORA-based wireless explosion-proof fire alarm includes an alarm main control circuit and a transformer filter circuit, a wireless communication circuit, and a speaker circuit all electrically connected to the alarm main control circuit. The transformer filter circuit converts an externally input DC24V voltage to DC3.3V voltage and supplies power to the alarm main control chip circuit and the wireless communication circuit. The wireless communication circuit receives external fire alarm signals and transmits them to the alarm main control circuit. The alarm main control circuit receives the fire alarm signals transmitted by the wireless communication circuit and sends control signals to the speaker circuit. The speaker circuit receives the control signals sent by the alarm main control circuit and emits an alarm signal.

[0009] In this utility model, preferably, the alarm main control circuit includes a main control chip D1, which is an HC32L130J8TA series control chip. Pins 30 and 31 of the main control chip D1 are connected to the wireless communication circuit, and pins 10 and 11 are connected to the speaker circuit.

[0010] In this utility model, preferably, the wireless communication circuit includes a wireless communication chip, which is an E22-400T22S series chip, and pins 7 and 8 of the wireless communication chip are connected to pins 30 and 31 of the main control chip D1.

[0011] In this utility model, preferably, the speaker circuit includes an audio module M1, a power amplifier circuit, and a speaker. The audio module M1 uses a MY2480-16PA series chip. Pins 7 and 8 of the audio module M1 are connected to pins 10 and 11 of the main control chip D1. Pins 5 and 6 of the audio module M1 are connected to the power amplifier circuit and then to the speaker.

[0012] In this invention, preferably, pins 5 and 6 of the audio module M1 are connected to operational amplifier N3 in the power amplifier circuit. The output of operational amplifier N3 is connected to speaker interface X3, which is used to connect to a speaker. Operational amplifier N3 amplifies the output audio of the audio module M1, and the amplified audio signal is transmitted to the speaker to drive the speaker to vibrate and produce sound.

[0013] In this invention, preferably, an indicator light circuit is also included. The indicator light circuit is connected between pins 24 and 25 of the main control chip D1. The indicator light circuit includes a light-emitting diode and a resistor connected in series.

[0014] In this invention, preferably, the transformer filter circuit includes a rectifier bridge N1, a common-mode filter branch, an LC filter branch, and a voltage conversion chip N4 connected in sequence. The rectifier bridge N1, the common-mode filter branch, and the LC filter branch are used to filter the input signal. Then, the voltage conversion chip N4 converts the DC24V voltage to DC3.3V to power the alarm main control circuit, the wireless communication circuit, and the speaker circuit.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The main control chip of this fire alarm supports a deep sleep mode, waking up only when a fire alarm signal is received. Combined with the low power consumption characteristics of LORA communication technology, it significantly reduces system energy consumption and is suitable for long-term unattended scenarios. The DC24V local power supply solves wiring and communication problems, and the wireless communication distance is long and the anti-interference ability is strong. The isolation design of the power amplifier circuit and the speaker interface ensures circuit stability at high decibel output and meets the safety requirements of explosion-proof scenarios. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of a LORA-based wireless explosion-proof fire alarm.

[0018] Figure 2 This is a circuit diagram of the alarm main control circuit described in this utility model.

[0019] Figure 3 This is a circuit diagram of the wireless communication circuit described in this utility model.

[0020] Figure 4 This is a circuit diagram of the speaker circuit described in this utility model.

[0021] Figure 5 This is a circuit diagram of the indicator light circuit described in this utility model.

[0022] Figure 6 This is a circuit diagram of the transformer filter circuit described in this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please also see Figures 1 to 6 This utility model provides a LORA-based wireless explosion-proof fire alarm, which can achieve a longer transmission distance, reduce power consumption, and effectively push alarm information. It solves wiring and communication problems by using a local DC24V power supply. Specifically, the fire alarm includes an alarm main control circuit, a transformer filter circuit, a wireless communication circuit, and a speaker circuit all electrically connected to the alarm main control circuit. The transformer filter circuit converts the externally input DC24V voltage to DC3.3V voltage and powers the alarm main control chip circuit and the wireless communication circuit. The wireless communication circuit receives external fire alarm signals and transmits them to the alarm main control circuit. The alarm main control circuit receives the fire alarm signals transmitted by the wireless communication circuit and sends control signals to the speaker circuit. The speaker circuit receives the control signals sent by the alarm main control circuit and emits an alarm signal.

[0026] In this embodiment, the alarm main control circuit includes a main control chip D1, which is an HC32L130J8TA series control chip. Pins 30 and 31 of the main control chip D1 are connected to the wireless communication circuit, and pins 10 and 11 are connected to the speaker circuit. The main control chip D1 is powered by 3.3V, with an operating voltage range of 2V to 5.5V. Its power consumption in deep sleep mode is 0.5uA. It is mainly used to connect the wireless communication circuit and the speaker circuit, receive alarm signals sent by the wireless communication module, and control the speaker to sound and the LED indicator to flash. The main control chip supports deep sleep mode, waking up only when receiving a fire alarm signal. Combined with the low-power characteristics of LoRa communication technology, it significantly reduces system energy consumption, making it suitable for long-term unattended operation scenarios.

[0027] In this embodiment, the wireless communication circuit includes a wireless communication chip, specifically the E22-400T22S series chip. Pins 7 and 8 of the wireless communication chip are connected to pins 30 and 31 of the main control chip D1. The wireless communication chip uses LoRa communication technology and is powered by DC 3.3V. It receives fire alarm information and sends it to the alarm control circuit, which then promptly notifies the user via a speaker signal, enabling on-site fire alarms and allowing residents to take timely measures to reduce fire hazards and ensure building safety. The wireless communication circuit utilizes the new generation NB technology of the E22-400T22S. Under the same base station conditions, LoRa increases the number of accesses by 5-10 times compared to existing wireless technologies. LoRa also boasts strong indoor coverage and anti-interference capabilities.

[0028] In this embodiment, the speaker circuit includes an audio module M1, a power amplifier circuit, and a speaker. The audio module M1 uses a MY2480-16PA series chip. Pins 7 and 8 of the audio module M1 are connected to pins 10 and 11 of the main control chip D1. Pins 5 and 6 of the audio module M1 are connected to the power amplifier circuit and then to the speaker.

[0029] In this embodiment, pins 5 and 6 of the audio module M1 are connected to operational amplifier N3 in the power amplifier circuit. The output of operational amplifier N3 is connected to speaker interface X3, which is used to connect to a speaker. Operational amplifier N3 amplifies the output audio of audio module M1, and the amplified audio signal is transmitted to the speaker to drive the speaker to vibrate and produce sound. The isolation design between the power amplifier circuit and the speaker interface ensures circuit stability at high decibel outputs and meets the safety requirements of explosion-proof scenarios.

[0030] In this embodiment, an indicator light circuit is also included. The indicator light circuit is connected between pins 24 and 25 of the main control chip D1. The indicator light circuit includes a light-emitting diode and a resistor connected in series. When the main control chip D1 receives a fire alarm information, it causes the light-emitting diode to work and the indicator light to illuminate, indicating that the fire alarm is working.

[0031] In this embodiment, the transformer-filter circuit includes a rectifier bridge N1, a common-mode filter branch, an LC filter branch, and a voltage conversion chip N4 connected in sequence. The rectifier bridge N1, the common-mode filter branch, and the π-type LC filter branch are used to filter the input signal. Then, the voltage conversion chip N4 converts the DC24V voltage to DC3.3V to power the alarm main control circuit, the wireless communication circuit, and the speaker circuit. The common-mode filter branch includes an inductor L4 and a capacitor C17 connected in parallel across the inductor L4. The π-type LC filter branch includes inductors L5 and L6 and capacitors C25 and C13. Using a local DC24V power supply eliminates the need for additional wiring, solving the problem of complex installation in traditional wired alarms. Its wide voltage adaptability allows it to adapt to voltage fluctuation scenarios, improving its applicability in explosion-proof environments. The transformer-filter circuit provides a clean power supply to the core circuit through multi-stage filtering and voltage regulation design.

[0032] Working principle:

[0033] After the external DC24V power supply is connected to the transformer and filter circuit, it is first rectified by the rectifier bridge N1 to remove reverse interference in the voltage. Then, it passes through the common-mode filter branch to filter out common-mode noise, and then through the LC filter branch to further suppress ripple. Finally, the voltage conversion chip N4 stabilizes the processed DC24V voltage to DC3.3V to power the alarm main control circuit and the LORA wireless communication circuit. At the same time, the speaker circuit directly uses the external DC24V power supply to ensure the high-decibel sound output requirement.

[0034] In standby mode, the main control chip D1 enters deep sleep mode to reduce overall power consumption. The LORA-based wireless communication circuit maintains a listening state and transmits the fire alarm signals received from the outside to the main control chip D1 in real time through the connection of its pins 7 and 8 with pins 30 and 31 of the main control chip.

[0035] When the wireless communication circuit receives a fire alarm signal, it immediately wakes up the main control chip D1 via pin interaction. After parsing the signal content, the main control chip D1 simultaneously triggers two responses. One is to send speaker control information to the speaker circuit, that is, to communicate with pins 7 and 8 of the audio module M1 through pins 10 and 11, instructing the audio module to output the corresponding alarm audio. The other is to drive the indicator light circuit to work, controlling the series-connected light-emitting diodes to conduct through pins 24 and 25, illuminating the indicator lights to provide a visual alarm.

[0036] The audio signal output by the audio module M1 is transmitted to the power amplifier circuit through pins 5 and 6. After being amplified, it drives the speaker through the speaker interface X3 to achieve a high-decibel sound alarm, thereby meeting the penetration requirements in explosion-proof scenarios. At the same time, the voice information accurately conveys the details of the fire and guides personnel to evacuate or handle the situation.

[0037] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

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