Wireless transmission circuit of alarm signal

Abstract

The utility model relates to the technical field of monitoring systems, in particular to a wireless transmission circuit for alarm signals, which comprises a transmitting module and a receiving module which are connected in a wireless communication mode. The transmitting module comprises a lithium battery management unit, a voltage reduction and stabilization unit, a micro-processing transmitting unit, a wireless transmitting unit and at least one alarm detection unit; the lithium battery management unit is electrically connected with the voltage reduction and stabilization unit, both the lithium battery management unit and the voltage reduction and stabilization unit are electrically connected with a positive 12V power supply, the output end of the voltage reduction and stabilization unit is electrically connected with the alarm detection unit, and the alarm detection unit is electrically connected with the micro-processing sending unit; the utility model aims to provide the wireless transmission circuit of the alarm signal, the conversion and forwarding of the alarm signal are realized through the wireless technology, the lithium battery management unit is added as standby power, the circuit design can be simplified, the line connection is convenient, the voltage reduction and stabilization unit is matched with the voltage stabilization unit to supply power to the main circuit, and the reliability of the circuit is improved. The power consumption of the system can be maximally reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring systems, in particular to a wireless transmission circuit for alarm signals. Background Art

[0002] In the defense zone, various faults need to be monitored. When a fault occurs or the line is damaged by human beings, the system needs to issue an alarm. When a fault occurs in the existing system, the system will stop working, resulting in the problem of being unable to monitor in real time and uninterruptedly. In addition, the existing circuit system has high power consumption, which is not conducive to the long-term use of the system. Utility Model Content

[0003] The purpose of the utility model is to propose a wireless transmission circuit for alarm signals, which realizes the conversion and forwarding of alarm signals through wireless technology, adds a lithium battery management unit as a backup power supply, simplifies the circuit design, and facilitates line connection. In the low-power design of the circuit, the buck stabilizing unit and the voltage stabilizing unit cooperate to power the main circuit, which can minimize the power consumption of the system.

[0004] To achieve this purpose, the utility model adopts the following technical solution: a wireless transmission circuit for alarm signals, comprising a transmitting module and a receiving module, wherein the transmitting module and the receiving module are connected via wireless communication;

[0005] The transmitting module includes a lithium battery management unit, a voltage step-down and voltage stabilization unit, a microprocessor transmitting unit, a wireless transmitting unit and at least one alarm detection unit;

[0006] The lithium battery management unit is electrically connected to the buck and voltage stabilizing unit, the lithium battery management unit and the buck and voltage stabilizing unit are both electrically connected to a positive 12V power supply, the output end of the buck and voltage stabilizing unit is electrically connected to the alarm detection unit, the alarm detection unit is electrically connected to the microprocessor sending unit, and the microprocessor sending unit is electrically connected to the wireless sending unit;

[0007] The receiving module includes a voltage stabilizing unit, a microprocessing receiving unit, a wireless receiving unit and a control driving unit;

[0008] The wireless receiving unit is electrically connected to the microprocessor receiving unit, the voltage stabilizing unit is electrically connected to a positive 12V power supply, the voltage stabilizing unit is electrically connected to the microprocessor receiving unit and the control driving unit, and the microprocessor receiving unit is electrically connected to the control driving unit.

[0009] Preferably, the lithium battery management unit includes a lithium battery charging and discharging electronic module MD1, a diode D1, a polar capacitor C1 and a capacitor C2, the positive terminal of the diode D1 is electrically connected to a positive 12V power supply, the negative terminal of the diode D1 is electrically connected to an input terminal of the lithium battery charging and discharging electronic module MD1, the output terminal of the lithium battery charging and discharging electronic module MD1 is electrically connected to one end of the polar capacitor C1, one end of the capacitor C2, a positive 12V power supply and the step-down and voltage stabilizing unit, and the other end of the polar capacitor C1 and the other end of the capacitor C2 are grounded.

[0010] Preferably, the step-down and voltage stabilizing unit includes a voltage stabilizing sub-module MD2, a polarity capacitor C3, a capacitor C4 and a first VCC output end, the input end of the voltage stabilizing sub-module MD2 is electrically connected to one end of the capacitor C2, the output end of the voltage stabilizing sub-module MD2 is electrically connected to one end of the polarity capacitor C3, one end of the capacitor C4 and the first VCC output end, the other end of the polarity capacitor C3 and the other end of the capacitor C4 are both grounded, and the first VCC output end is electrically connected to the alarm detection unit and the microprocessor sending unit.

[0011] Preferably, the step-down voltage stabilizing unit further includes a resistor R1 and a diode D2, one end of the resistor R1 is electrically connected to the output end of the voltage stabilizing submodule MD2, the other end of the resistor R1 is electrically connected to the positive end of the diode D2, and the negative end of the diode D2 is grounded.

[0012] Preferably, the alarm detection unit includes a resistor R2, a resistor R4, a resistor R5, a first comparator U1A, a resistor R8, a diode D3, a resistor R10, a resistor R11, a transistor Q1, a resistor R3, a capacitor C5, a resistor R12, a resistor R6, a resistor R7, a second comparator U1B, a resistor R9 and a diode D4;

[0013] The first VCC output end is electrically connected to one end of the resistor R2, one end of the resistor R5, the positive power supply end of the first comparator U1A, the positive power supply end of the second comparator U1B, one end of the resistor R8, and one end of the resistor R9; the other end of the resistor R2 is electrically connected to one end of the resistor R3, one end of the capacitor C5, one end of the resistor R4, and one end of the resistor R12; the other end of the resistor R4 is electrically connected to the positive input pin of the first comparator U1A, the other end of the resistor R12 is electrically connected to the negative input pin of the second comparator U1B, the other end of the resistor R5 is electrically connected to the negative input pin of the first comparator U1A and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the resistor R7 and the positive input pin of the second comparator U1B, the other end of the resistor R3, the other end of the capacitor C5, the other end of the resistor R7, the negative power supply end of the first comparator U1A, and the negative power supply end of the second comparator U1B are grounded;

[0014] The output end of the first comparator U1A is electrically connected to the other end of the resistor R8 and the positive end of the diode D3, the output end of the second comparator U1B is electrically connected to the other end of the resistor R9 and the positive end of the diode D4, the cathode end of the diode D3 is electrically connected to the cathode end of the diode D4, one end of the resistor R10 and one end of the resistor R11, the other end of the resistor R11 is electrically connected to the base of the transistor Q1, the collector of the transistor Q1 is electrically connected to the microprocessor sending unit, and the other end of the resistor R10 and the emitter of the transistor Q1 are grounded.

[0015] Preferably, the voltage stabilizing unit includes a resistor R21, a diode D21, a polar capacitor C21, a capacitor C22, a voltage stabilizing submodule MD3, a polar capacitor C23, a capacitor C24, a resistor R22, a diode D22 and a second VCC output terminal;

[0016] One end of the resistor R21 is electrically connected to the positive 12V power supply, the other end of the resistor R21 is electrically connected to the positive end of the diode D21, the negative end of the diode D21 is electrically connected to the positive end of the polarity capacitor C21, one end of the capacitor C22 and the input end of the voltage stabilizing submodule MD3, the output end of the voltage stabilizing submodule MD3 is electrically connected to the positive end of the polarity capacitor C23, one end of the capacitor C24, one end of the resistor R22 and the second VCC output end, the other end of the resistor R22 is electrically connected to the positive end of the diode D22, the negative end of the polarity capacitor C21, the other end of the capacitor C22, the negative end of the polarity capacitor C23, the other end of the capacitor C24 and the negative end of the diode D22 are grounded; the second VCC output end is electrically connected to the microprocessor receiving unit, the wireless receiving unit and the control drive unit.

[0017] Preferably, the control drive unit includes a serial-to-parallel conversion chip, a crystal oscillator chip and a relay, the serial-to-parallel conversion chip is electrically connected to the microprocessor receiving unit, the crystal oscillator chip is electrically connected to the serial-to-parallel conversion chip, and the relay is electrically connected to the crystal oscillator chip.

[0018] The beneficial effect of a technical solution of the utility model is that the wireless transmission unit and the wireless receiving unit use wireless technology to realize the conversion and forwarding of the alarm signal. At the same time, a lithium battery management unit is added as a backup power supply. Considering the R&D cycle, the lithium battery management unit adopts an integrated module, which can simplify the circuit design and facilitate line connection. In the low-power design of the circuit, the buck regulator unit and the regulator unit cooperate to power the main circuit, which can minimize the power consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of module connection of an embodiment of the utility model;

[0020] Figure 2 This is a connection diagram of a transmitting module in one embodiment of the utility model;

[0021] Figure 3 This is a connection diagram of a receiving module in one embodiment of the utility model;

[0022] Figure 4 This is a circuit connection diagram of a transmitting module in one embodiment of the utility model;

[0023] Figure 5 It is a circuit connection diagram of a receiving module in one embodiment of the utility model.

[0024] Among them: a transmitting module 1, a lithium battery management unit 11, a voltage step-down and voltage stabilization unit 12, a microprocessor transmitting unit 13, a wireless transmitting unit 14, and an alarm detection unit 15;

[0025] Receiving module 2, voltage stabilizing unit 21, microprocessing receiving unit 22, wireless receiving unit 23, and control driving unit 24. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figures 1 to 5 As shown, a wireless transmission circuit of an alarm signal includes a transmitting module 1 and a receiving module 2, wherein the transmitting module 1 and the receiving module 2 are connected via wireless communication;

[0031] The transmitting module 1 includes a lithium battery management unit 11, a voltage step-down and voltage stabilization unit 12, a microprocessor transmitting unit 13, a wireless transmitting unit 14 and at least one alarm detection unit 15;

[0032] The lithium battery management unit 11 is electrically connected to the buck and voltage stabilizing unit 12, and both the lithium battery management unit 11 and the buck and voltage stabilizing unit 12 are electrically connected to a positive 12V power supply, and the output end of the buck and voltage stabilizing unit 12 is electrically connected to the alarm detection unit 15, and the alarm detection unit 15 is electrically connected to the microprocessor sending unit 13, and the microprocessor sending unit 13 is electrically connected to the wireless sending unit 14;

[0033] The receiving module 2 includes a voltage stabilizing unit 21, a microprocessing receiving unit 22, a wireless receiving unit 23 and a control driving unit 24;

[0034] The wireless receiving unit 23 is electrically connected to the microprocessor receiving unit 22 , the voltage stabilizing unit 21 is electrically connected to a positive 12V power supply, the voltage stabilizing unit 21 is electrically connected to the microprocessor receiving unit 22 and the control driving unit 24 , and the microprocessor receiving unit 22 is electrically connected to the control driving unit 24 .

[0035] The transmitter module 1 and the receiver module 2 are used together. When in use, the transmitter module 1 and the receiver module 2 are respectively arranged on independent circuit boards, and wireless signal communication is performed through the transmitter module 1 and the receiver module 2. The lithium battery management unit 11 is equivalent to a UPS power supply. After the city power is cut off, the lithium battery management unit 11 can continue to supply power to ensure that the subsequent circuits are powered on. At the same time, the voltage is converted through the step-down and voltage stabilizing unit 12 and the voltage stabilizing unit 21, thereby generating a suitable voltage for other circuits to work.

[0036] In the present utility model, the wireless transmission unit 14 and the wireless receiving unit 23 adopt LoRa wireless technology to realize the conversion and forwarding of the alarm signal. At the same time, a lithium battery management unit 11 is added as a backup power supply. Considering the research and development cycle, the lithium battery management unit 11 adopts an integrated module, which can simplify the circuit design and facilitate line connection. In the low-power design of the circuit, the buck regulator unit 12 and the regulator unit 21 cooperate to power the main circuit, which can minimize the power consumption of the system.

[0037] Preferably, the lithium battery management unit 11 includes a lithium battery charging and discharging electronic module MD1, a diode D1, a polarity capacitor C1 and a capacitor C2, the positive terminal of the diode D1 is electrically connected to a positive 12V power supply, the negative terminal of the diode D1 is electrically connected to an input terminal of the lithium battery charging and discharging electronic module MD1, the output terminal of the lithium battery charging and discharging electronic module MD1 is electrically connected to one end of the polarity capacitor C1, one end of the capacitor C2, a positive 12V power supply and the step-down and voltage stabilizing unit 12, and the other end of the polarity capacitor C1 and the other end of the capacitor C2 are grounded.

[0038] The lithium battery management unit 11 implements the charge / discharge management of the lithium battery. When there is power at the user end, the positive 12V power supply supplies power to the lithium battery management unit 11, and the positive 12V power supply also supplies power to the step-down and voltage stabilizing unit 12 as a power supply and probe.

[0039] Specifically, the step-down and voltage stabilizing unit 12 includes a voltage stabilizing sub-module MD2, a polarity capacitor C3, a capacitor C4 and a first VCC output end, the input end of the voltage stabilizing sub-module MD2 is electrically connected to one end of the capacitor C2, the output end of the voltage stabilizing sub-module MD2 is electrically connected to one end of the polarity capacitor C3, one end of the capacitor C4 and the first VCC output end, the other end of the polarity capacitor C3 and the other end of the capacitor C4 are both grounded, and the first VCC output end is electrically connected to the alarm detection unit 15 and the microprocessor sending unit 13.

[0040] The step-down and voltage stabilizing unit 12 converts the positive 12V power supply to provide a suitable power supply for subsequent circuits, such as the microprocessor sending unit 13 and the alarm detection unit 15.

[0041] Preferably, the step-down voltage stabilizing unit 12 further includes a resistor R1 and a diode D2, one end of the resistor R1 is electrically connected to the output end of the voltage stabilizing submodule MD2, the other end of the resistor R1 is electrically connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is grounded. The resistor R1 and the diode D2 cooperate to display the power supply, and when the step-down voltage stabilizing unit 12 works normally, the diode D2 lights up.

[0042] Specifically, the alarm detection unit 15 includes a resistor R2, a resistor R4, a resistor R5, a first comparator U1A, a resistor R8, a diode D3, a resistor R10, a resistor R11, a transistor Q1, a resistor R3, a capacitor C5, a resistor R12, a resistor R6, a resistor R7, a second comparator U1B, a resistor R9 and a diode D4;

[0043] The first VCC output end is electrically connected to one end of the resistor R2, one end of the resistor R5, the positive power supply end of the first comparator U1A, the positive power supply end of the second comparator U1B, one end of the resistor R8, and one end of the resistor R9; the other end of the resistor R2 is electrically connected to one end of the resistor R3, one end of the capacitor C5, one end of the resistor R4, and one end of the resistor R12; the other end of the resistor R4 is electrically connected to the positive input pin of the first comparator U1A, the other end of the resistor R12 is electrically connected to the negative input pin of the second comparator U1B, the other end of the resistor R5 is electrically connected to the negative input pin of the first comparator U1A and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the resistor R7 and the positive input pin of the second comparator U1B, the other end of the resistor R3, the other end of the capacitor C5, the other end of the resistor R7, the negative power supply end of the first comparator U1A, and the negative power supply end of the second comparator U1B are grounded;

[0044] The output end of the first comparator U1A is electrically connected to the other end of the resistor R8 and the positive end of the diode D3, the output end of the second comparator U1B is electrically connected to the other end of the resistor R9 and the positive end of the diode D4, the cathode end of the diode D3 is electrically connected to the cathode end of the diode D4, one end of the resistor R10 and one end of the resistor R11, the other end of the resistor R11 is electrically connected to the base of the transistor Q1, the collector of the transistor Q1 is electrically connected to the microprocessor sending unit 13, and the other end of the resistor R10 and the emitter of the transistor Q1 are grounded.

[0045] like Figure 4 As shown, the resistor R3 is used as a terminal resistor to connect the external device to the alarm detection unit 15, which can prevent the wireless transmission circuit from being damaged.

[0046] Specifically, when the resistor R3 connected to the external device is disconnected, the capacitor C5 operates normally, and a part of the input voltage of the buck stabilizing unit 12 is divided by the resistors R2 and R4, and then input to the positive input pin of the first comparator U1A. A part of the input voltage of the buck stabilizing unit 12 is divided by the resistor R5 and input to the negative input pin of the first comparator U1A. At this time, when the voltage value of the positive input pin of the first comparator U1A is greater than the negative input pin, the first comparator U1A outputs a high level, the transistor Q1 is turned on, and a signal is given to the microprocessor sending unit 13 to drive the light-emitting diode D5 to turn off. When the voltage value of the positive input pin of the first comparator U1A is less than the negative input pin, the first comparator U1A outputs a low level, the transistor Q1 is turned off, and a signal is given to the microprocessor sending unit 13 to drive the light-emitting diode D5 to emit light.

[0047] When the resistor R3 connected to the external device is turned on, the capacitor C5 is short-circuited and a part of the input voltage of the buck stabilizing unit 12 is divided by the resistors R5 and R6 and input to the positive input pin of the second comparator U1B. A part of the input voltage of the buck stabilizing unit 12 is divided by the resistor R4 and input to the negative input pin of the second comparator U1B. At this time, when the voltage value of the positive input pin of the second comparator U1B is greater than the negative input pin, the second comparator U1B outputs a high level, the transistor Q1 is turned on, and a signal is given to the microprocessor sending unit 13 to drive the light-emitting diode D5 to turn off. When the voltage value of the positive input pin of the second comparator U1B is less than the negative input terminal, the second comparator U1B outputs a low level, the transistor Q1 is turned off, and a signal is given to the microprocessor sending unit 13 to drive the light-emitting diode D5 to emit light.

[0048] Specifically, the voltage stabilizing unit 21 includes a resistor R21, a diode D21, a polar capacitor C21, a capacitor C22, a voltage stabilizing submodule MD3, a polar capacitor C23, a capacitor C24, a resistor R22, a diode D22 and a second VCC output terminal;

[0049] One end of the resistor R21 is electrically connected to the positive 12V power supply, the other end of the resistor R21 is electrically connected to the positive end of the diode D21, the negative end of the diode D21 is electrically connected to the positive end of the polarity capacitor C21, one end of the capacitor C22 and the input end of the voltage stabilizing submodule MD3, the output end of the voltage stabilizing submodule MD3 is electrically connected to the positive end of the polarity capacitor C23, one end of the capacitor C24, one end of the resistor R22 and the second VCC output end, the other end of the resistor R22 is electrically connected to the positive end of the diode D22, the negative end of the polarity capacitor C21, the other end of the capacitor C22, the negative end of the polarity capacitor C23, the other end of the capacitor C24 and the negative end of the diode D22 are grounded; the second VCC output end is electrically connected to the microprocessor receiving unit 22, the wireless receiving unit 23 and the control drive unit 24.

[0050] The voltage stabilizing unit 21 converts the positive 12V power supply to provide a suitable voltage for subsequent circuits, such as the microprocessor receiving unit 22, the control driving unit 24, etc. The power supply is displayed by the cooperation of the resistor R22 and the diode D22. When the voltage stabilizing unit 21 works normally, the diode D22 lights up.

[0051] Preferably, the control driving unit 24 includes a serial-to-parallel conversion chip, a crystal oscillator chip and a relay, the serial-to-parallel conversion chip is electrically connected to the microprocessor receiving unit 22, the crystal oscillator chip is electrically connected to the serial-to-parallel conversion chip, and the relay is electrically connected to the crystal oscillator chip.

[0052] The microprocessor receiving unit 22 receives the alarm signal sent by the microprocessor sending unit 13, decodes it through the protocol, and drives the corresponding relay to complete the output of the alarm signal. The serial-to-parallel conversion chip and the crystal oscillator chip form a control and drive circuit to drive the alarm output relay to work. The serial-to-parallel conversion chip uses the chip model 74HC595, which can reduce the occupation of the single-chip microcomputer interface. The crystal oscillator chip uses ULN2803, which replaces the traditional triode and simplifies the circuit design.

[0053] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A wireless transmission circuit for alarm signals, characterized in that: It includes a transmitting module and a receiving module, wherein the transmitting module and the receiving module are connected via wireless communication; The transmitting module includes a lithium battery management unit, a voltage step-down and voltage stabilization unit, a microprocessor transmitting unit, a wireless transmitting unit and at least one alarm detection unit; The lithium battery management unit is electrically connected to the buck and voltage stabilizing unit, the lithium battery management unit and the buck and voltage stabilizing unit are both electrically connected to a positive 12V power supply, the output end of the buck and voltage stabilizing unit is electrically connected to the alarm detection unit, the alarm detection unit is electrically connected to the microprocessor sending unit, and the microprocessor sending unit is electrically connected to the wireless sending unit; The receiving module includes a voltage stabilizing unit, a microprocessing receiving unit, a wireless receiving unit and a control driving unit; The wireless receiving unit is electrically connected to the microprocessor receiving unit, the voltage stabilizing unit is electrically connected to a positive 12V power supply, the voltage stabilizing unit is electrically connected to the microprocessor receiving unit and the control driving unit, and the microprocessor receiving unit is electrically connected to the control driving unit.

2. A wireless transmission circuit for alarm signals according to claim 1, characterized in that: The lithium battery management unit includes a lithium battery charging and discharging electronic module MD1, a diode D1, a polar capacitor C1 and a capacitor C2. The positive terminal of the diode D1 is electrically connected to a positive 12V power supply, the negative terminal of the diode D1 is electrically connected to an input terminal of the lithium battery charging and discharging electronic module MD1, the output terminal of the lithium battery charging and discharging electronic module MD1 is electrically connected to one end of the polar capacitor C1, one end of the capacitor C2, a positive 12V power supply and the step-down and voltage stabilizing unit, and the other end of the polar capacitor C1 and the other end of the capacitor C2 are grounded.

3. The wireless transmission circuit of an alarm signal according to claim 1, characterized in that: The step-down and voltage stabilizing unit includes a voltage stabilizing submodule MD2, a polarity capacitor C3, a capacitor C4 and a first VCC output end. The input end of the voltage stabilizing submodule MD2 is electrically connected to one end of the capacitor C2, the output end of the voltage stabilizing submodule MD2 is electrically connected to one end of the polarity capacitor C3, one end of the capacitor C4 and the first VCC output end, the other end of the polarity capacitor C3 and the other end of the capacitor C4 are both grounded, and the first VCC output end is electrically connected to the alarm detection unit and the microprocessor sending unit.

4. A wireless transmission circuit for alarm signals according to claim 3, characterized in that: The step-down voltage stabilizing unit further includes a resistor R1 and a diode D2, one end of the resistor R1 is electrically connected to the output end of the voltage stabilizing submodule MD2, the other end of the resistor R1 is electrically connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is grounded.

5. The wireless transmission circuit of an alarm signal according to claim 3, characterized in that: The alarm detection unit includes a resistor R2, a resistor R4, a resistor R5, a first comparator U1A, a resistor R8, a diode D3, a resistor R10, a resistor R11, a transistor Q1, a resistor R3, a capacitor C5, a resistor R12, a resistor R6, a resistor R7, a second comparator U1B, a resistor R9 and a diode D4; The first VCC output end is electrically connected to one end of the resistor R2, one end of the resistor R5, the positive power supply end of the first comparator U1A, the positive power supply end of the second comparator U1B, one end of the resistor R8, and one end of the resistor R9; the other end of the resistor R2 is electrically connected to one end of the resistor R3, one end of the capacitor C5, one end of the resistor R4, and one end of the resistor R12; the other end of the resistor R4 is electrically connected to the positive input pin of the first comparator U1A, the other end of the resistor R12 is electrically connected to the negative input pin of the second comparator U1B, the other end of the resistor R5 is electrically connected to the negative input pin of the first comparator U1A and one end of the resistor R6, the other end of the resistor R6 is electrically connected to one end of the resistor R7 and the positive input pin of the second comparator U1B, the other end of the resistor R3, the other end of the capacitor C5, the other end of the resistor R7, the negative power supply end of the first comparator U1A, and the negative power supply end of the second comparator U1B are grounded; The output end of the first comparator U1A is electrically connected to the other end of the resistor R8 and the positive end of the diode D3, the output end of the second comparator U1B is electrically connected to the other end of the resistor R9 and the positive end of the diode D4, the cathode end of the diode D3 is electrically connected to the cathode end of the diode D4, one end of the resistor R10 and one end of the resistor R11, the other end of the resistor R11 is electrically connected to the base of the transistor Q1, the collector of the transistor Q1 is electrically connected to the microprocessor sending unit, and the other end of the resistor R10 and the emitter of the transistor Q1 are grounded.

6. The wireless transmission circuit of an alarm signal according to claim 1, characterized in that: The voltage stabilizing unit includes a resistor R21, a diode D21, a polar capacitor C21, a capacitor C22, a voltage stabilizing submodule MD3, a polar capacitor C23, a capacitor C24, a resistor R22, a diode D22 and a second VCC output terminal; One end of the resistor R21 is electrically connected to the positive 12V power supply, the other end of the resistor R21 is electrically connected to the positive end of the diode D21, the negative end of the diode D21 is electrically connected to the positive end of the polarity capacitor C21, one end of the capacitor C22 and the input end of the voltage stabilizing submodule MD3, the output end of the voltage stabilizing submodule MD3 is electrically connected to the positive end of the polarity capacitor C23, one end of the capacitor C24, one end of the resistor R22 and the second VCC output end, the other end of the resistor R22 is electrically connected to the positive end of the diode D22, the negative end of the polarity capacitor C21, the other end of the capacitor C22, the negative end of the polarity capacitor C23, the other end of the capacitor C24 and the negative end of the diode D22 are grounded; the second VCC output end is electrically connected to the microprocessor receiving unit, the wireless receiving unit and the control drive unit.

7. The wireless transmission circuit of an alarm signal according to claim 1, characterized in that: The control driving unit includes a serial-to-parallel conversion chip, a crystal oscillator chip and a relay. The serial-to-parallel conversion chip is electrically connected to the microprocessor receiving unit, the crystal oscillator chip is electrically connected to the serial-to-parallel conversion chip, and the relay is electrically connected to the crystal oscillator chip.

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