Atmosphere data detection system based on self-excited oscillation circuit
The atmospheric data detection system addresses the limitations of traditional barometers by employing a self-excited oscillation circuit and temperature compensation to achieve precise and rapid atmospheric pressure measurements.
Patent Information
- Application Number
- CN202322834256.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-20
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-10-20
AI Technical Summary
Traditional barometers, both mechanical and electronic, suffer from complex structures, high costs, and slow response speeds in detecting atmospheric data.
An atmospheric data detection system utilizing a self-excited oscillation circuit with a probe and control box, incorporating heating and deicing features, and integrated temperature sensors, to accurately sense and convert atmospheric pressure signals into frequency signals for precise measurement.
The system enhances measurement accuracy and response speed by using a self-excited oscillation circuit and temperature compensation, providing robust atmospheric pressure data with high precision and resistance to interference.
Smart Images
Figure CN222188626U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of atmospheric data detection, relates to an atmospheric data detection device, and specifically relates to an atmospheric data detection system based on a self-excited oscillation circuit. Background Art
[0002] In the fields of aerospace, meteorology, environmental monitoring, etc., the detection of atmospheric data is one of the important measurement parameters. Traditional barometers are usually mechanical, with complex structures, high prices, and the measurement accuracy is affected by many factors.
[0003] With the development of electronic technology, electronic barometers based on sensors have been widely used, but their measurement principles are usually based on structures such as varistors and resonant cavities, and they also have problems such as complex structure, high cost, and slow response speed. Summary of the invention
[0004] Purpose of the utility model:
[0005] In order to solve the above problems, the utility model provides an atmospheric data detection system based on a self-excited oscillation circuit, which senses the surface pressure of the fuselage and outputs it and has heating and deicing, waterproof and dustproof functions; the pressure signal is solved and the atmospheric pressure value is calculated through a signal solving component.
[0006] Utility model technical solution:
[0007] An atmospheric data detection system based on a self-excited oscillation circuit comprises a control box, an air inlet, and a probe. The air inlet is arranged in front of the probe and extends outward from an aircraft fuselage. The probe is connected to the control box at the rear and the control box is placed inside the aircraft fuselage. A signal conversion circuit board assembly, a power conversion circuit board assembly, and a signal solution circuit board assembly are arranged in the control box. The signal conversion circuit board assembly generates an oscillation frequency signal corresponding to the atmospheric pressure through a self-excited oscillation circuit. The power conversion circuit board assembly supplies power to other circuit board assemblies. The signal solution circuit board converts the frequency signal into atmospheric pressure data and transmits it to an upper-level system.
[0008] Furthermore, the probe is cylindrical and has a diameter of 9 mm.
[0009] Furthermore, a heating device is provided in the air inlet.
[0010] Furthermore, the air intake has an inclination angle of 68° with respect to the plane of the aircraft.
[0011] Furthermore, a silicone hose is attached to the air inlet to sense the external atmospheric pressure and transmit the pressure signal to the pressure sensor.
[0012] Furthermore, the heating device includes a heating belt and a PTC ceramic heating plate, which are electrically connected in series and in parallel, and are connected to an external power supply through a wire. The ice layer on the probe surface is removed by heating to achieve continuous detection.
[0013] Furthermore, the signal conversion circuit board assembly includes a pressure sensor, a self-excited oscillation circuit, and a frequency conversion circuit. The pressure sensor senses the surface pressure of the fuselage through the air intake hole and converts the pressure signal into an electrical signal. The self-excited oscillation circuit adjusts its own oscillation frequency through the electrical signal, thereby generating an electrical signal with a frequency corresponding to the atmospheric pressure value. The frequency conversion circuit converts the electrical signal of this frequency into a square wave signal of the corresponding frequency and transmits it to the signal solution circuit to solve the pressure value.
[0014] Furthermore, a temperature sensor is integrated inside the core of each circuit board assembly to reflect the internal temperature of the core in real time and perform temperature compensation on the core.
[0015] The advantages of the utility model are as follows:
[0016] 1. The utility model atmospheric data detection device can improve the accuracy of pressure measurement by designing the probe structure and the self-excited oscillation circuit, and utilizing the air inlets in different directions on the probe to sense the atmospheric pressure from different angles. The self-excited oscillation circuit has a high response speed and can quickly respond to changes in atmospheric pressure.
[0017] 2. The new probe assembly used in the present invention has air inlet holes in different directions on the top, and a silicone hose is attached to the air inlet hole to sense the external atmospheric pressure and transmit the pressure signal to the pressure sensor to meet the basic needs of heating and deicing.
[0018] 3. A temperature sensor is integrated inside each core to reflect the internal temperature of the core in real time, and a polynomial fitting method is used to perform temperature compensation on the core, ensuring the accuracy requirements of the sensor. The temperature voltage signal is converted into a frequency signal through a V / F conversion circuit and output to the signal solution circuit board assembly. Compared with the temperature signal, the frequency signal has strong anti-interference ability, which is beneficial to improving the solution accuracy and precision of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solution of the implementation method of the patent of the present invention, the following is a brief introduction to the drawings required for use in the implementation method. It should be understood that the following drawings only show certain embodiments of the patent of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 It is a structural schematic diagram of an atmospheric data detection device;
[0021] Figure 2 This is a principle block diagram of an atmospheric data detection device;
[0022] Figure 3 This is the schematic diagram of the self-excited oscillation circuit;
[0023] Figure 4 This is the frequency conversion principle diagram.
[0024] Among them, 1-air inlet, 2-heating device, 3-probe, 4-control box, 5-connector. DETAILED DESCRIPTION
[0025] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0027] 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 interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point 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 by specific circumstances.
[0028] Embodiment 1:
[0029] An atmospheric data detection system based on a self-excited oscillation circuit comprises a control box 4, an air inlet 1 and a probe 3. The air inlet 1 is arranged in front of the probe 3 and extends outward from an aircraft fuselage. The probe 3 is connected to the control box 4 at the rear, and the control box 4 is placed inside the aircraft fuselage. A signal conversion circuit board assembly, a power conversion circuit board assembly and a signal resolution circuit board assembly are arranged in the control box 4. The signal conversion circuit board assembly generates an oscillation frequency signal corresponding to the atmospheric pressure through a self-excited oscillation circuit. The power conversion circuit board assembly supplies power to other circuit board assemblies. The signal resolution circuit board converts the frequency signal into atmospheric pressure data and transmits it to an upper-level system.
[0030] The probe 3 is cylindrical and has a diameter of 9 mm.
[0031] A heating device 2 is provided in the air inlet 1 .
[0032] The inclination angle of the air intake 1 to the plane of the aircraft is 68°.
[0033] A silicone hose is attached to the air inlet 1 to sense the external atmospheric pressure and transmit the pressure signal to the pressure sensor.
[0034] The heating device includes a heating belt and a PTC ceramic heating plate, which are electrically connected in series and parallel, and are connected to an external power supply through a wire. The ice layer on the probe surface is removed by heating to achieve continuous detection.
[0035] The signal conversion circuit board assembly includes a pressure sensor, a self-excited oscillation circuit, and a frequency conversion circuit. The pressure sensor senses the surface pressure of the fuselage through the air inlet 1 and converts the pressure signal into an electrical signal. The self-excited oscillation circuit adjusts its own oscillation frequency through the electrical signal to generate an electrical signal with a frequency corresponding to the atmospheric pressure value. The frequency conversion circuit converts the electrical signal with this frequency into a square wave signal of the corresponding frequency and transmits it to the signal calculation circuit to calculate the pressure value.
[0036] Each circuit board assembly has an integrated temperature sensor inside the core to reflect the internal temperature of the core in real time and perform temperature compensation on the core.
[0037] Embodiment 2:
[0038] An atmospheric data detection device comprises a probe assembly and a control box assembly. The probe assembly is installed transversely to the airflow, has an air inlet and a heating slot on the top, is installed on the fuselage in an outwardly extending manner, and has an inclination angle of 68° to the plane of the aircraft. The control box assembly is placed inside the fuselage and comprises a signal conversion circuit board assembly, a power conversion circuit board assembly, and a signal resolution circuit board assembly. The signal conversion circuit board assembly generates an oscillation frequency signal corresponding to the atmospheric pressure through a self-excited oscillation circuit, the power conversion circuit board assembly converts the aircraft's 28V power supply voltage and supplies power to each circuit board assembly, and the signal resolution circuit board converts the frequency signal into atmospheric data and transmits it to a superior system.
[0039] The cylindrical probe has a diameter of 9 mm and is made of stainless steel. An air inlet and a heating slot are provided on the cylindrical probe for sensing the surface pressure of the fuselage and placing a heating device.
[0040] The heating device is composed of a heating belt and a PTC ceramic heating plate, which are electrically connected in series and in parallel, and are connected to an external power supply through a wire. The ice layer on the probe surface is removed by heating to achieve continuous detection.
[0041] The control box assembly includes a signal conversion circuit board assembly, a power conversion circuit board assembly and a signal resolution circuit board assembly; wherein the signal conversion circuit board assembly and the power conversion circuit board assembly are connected via internal wires, and the signal resolution circuit board assembly and the power conversion circuit board assembly are connected via an inter-board connector.
[0042] The signal conversion circuit board assembly is mainly composed of a pressure sensor, a self-excited oscillation circuit, and a frequency conversion circuit. The pressure sensor senses the surface pressure of the fuselage through the air inlet and converts the pressure signal into an electrical signal. The self-excited oscillation circuit can adjust its own oscillation frequency through the electrical signal to generate an electrical signal with a frequency corresponding to the atmospheric pressure value. The frequency conversion circuit converts the electrical signal with this frequency into a square wave signal with a corresponding frequency and transmits it to the signal calculation circuit for pressure value calculation.
[0043] Embodiment 3:
[0044] See also Figure 1The utility model atmospheric data detection device is composed of a probe assembly and a control box assembly. The probe assembly includes a cylindrical probe assembly and an anti-icing heating assembly. The probe assembly is provided with air inlets in different directions on the top. A silicone hose is attached to the air inlet to sense the external atmospheric pressure and transmit the pressure signal to the pressure sensor. The heating assembly is composed of a heating belt and a PTC ceramic heating sheet. It is set by the resistance value and the electrical connection relationship. After stable operation at room temperature, the equivalent resistance of the heater is 7.5Ω. It is powered by 28VDC and the power of the heater is 105W when it is working stably, which meets the basic requirements of heating and deicing. The control box assembly is used to install the circuit board assembly and the connector assembly.
[0045] See also Figure 2 The control box assembly is composed of a signal conversion circuit board assembly, a power conversion circuit board assembly, and a signal solution circuit board assembly. The signal conversion circuit board converts the pressure signal and the temperature signal into an electrical frequency signal and transmits it to the signal solution circuit board assembly. The signal solution circuit board solves the captured electrical frequency signal and outputs the pressure data to the upper system through the RS422 bus. The power circuit board assembly converts the 28V DC voltage provided by the aircraft into 3.5V and 15V to power the electronic components.
[0046] See also Figure 3 The main body of the signal conversion circuit is a self-excited oscillation circuit and a signal conditioning circuit. The self-excited oscillation circuit adjusts its own oscillation frequency according to the electrical signal transmitted by the pressure sensor to generate an oscillation frequency signal corresponding to the atmospheric pressure; the sensor will output a small current signal of the corresponding frequency after receiving the atmospheric pressure, which needs to undergo signal amplification, signal conversion, and signal conditioning for closed-loop control to achieve resonance. Therefore, the designed self-excited oscillation circuit mainly consists of a pressure sensor, a C / V link, a phase shift link, and an AGC link. The pressure sensor converts the pressure signal into a weak current signal, the C / V link converts the current signal into a voltage signal, the phase shift link compensates for the phase of the C / V link by adjusting the debugging resistor, and the AGC link controls the loop gain by adjusting the resistance value of the debugging resistor to ensure that the resonance condition is achieved.
[0047] See also Figure 4Due to the temperature drift characteristics of the core, its output characteristics at the same pressure and different temperatures will drift by about 75Pa. In order to improve the accuracy requirements, a temperature sensor is integrated inside each core to reflect the internal temperature of the core in real time, and the core is temperature compensated by a polynomial fitting method to ensure the accuracy requirements of the sensor. In order to facilitate the transmission and acquisition of temperature signals, the temperature voltage signal is converted into a frequency signal through a V / F conversion circuit and output to the signal solution circuit board assembly. Compared with temperature signals, frequency signals have strong anti-interference ability, which is conducive to improving the accuracy and precision of the system. The V / F conversion circuit is based on AD654JR. After V / F conversion, the temperature frequency output range is 2kHz~8.5kHz in the range of -55℃~85℃, and the frequency-temperature resolution is 20Hz / ℃. The sinusoidal signal after the self-excited oscillation circuit is conditioned into a square wave signal after the comparison circuit and transmitted to the signal solution circuit board.
[0048] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable technicians familiar with the technical field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit and essence of the utility model should be included in the protection scope of the utility model. The technology, shape, and structure parts not described in detail in the utility model are all well-known technologies.
Claims
1. An atmospheric data detection system based on a self-excited oscillation circuit, characterized in that: The invention comprises a control box (4), an air inlet (1), and a probe (3); the probe (3) is provided with an air inlet (1) in front, the air inlet (1) extends outward from the aircraft fuselage, the probe (3) is connected to the control box (4) at the rear, the control box (4) is placed inside the aircraft fuselage, and the control box (4) is provided with a signal conversion circuit board assembly, a power conversion circuit board assembly, and a signal resolution circuit board assembly; the signal conversion circuit board assembly generates an oscillation frequency signal corresponding to the atmospheric pressure through a self-excited oscillation circuit, the power conversion circuit board assembly supplies power to other circuit board assemblies, and the signal resolution circuit board converts the frequency signal into atmospheric pressure data and transmits the data to an upper-level system.
2. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: The probe (3) is cylindrical and has a diameter of 9 mm.
3. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: A heating device (2) is arranged in the air inlet (1).
4. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 3 is characterized in that: The heating device comprises a heating belt and a PTC ceramic heating sheet, which are electrically connected in series and in parallel and are connected to an external power source through a wire.
5. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: The inclination angle of the air inlet (1) to the plane of the aircraft is 68°.
6. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: A silicone hose is attached to the air inlet (1).
7. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: The signal conversion circuit board assembly comprises a pressure sensor, a self-excited oscillation circuit, and a frequency conversion circuit. The pressure sensor senses the pressure on the surface of the fuselage through an air inlet (1) and converts the pressure signal into an electrical signal. The self-excited oscillation circuit adjusts its own oscillation frequency through the electrical signal, thereby generating an electrical signal with a frequency corresponding to the atmospheric pressure value. The frequency conversion circuit converts the electrical signal with the frequency into a square wave signal with the corresponding frequency and transmits it to the signal calculation circuit for calculating the pressure value.
8. The atmospheric data detection system based on the self-excited oscillation circuit according to claim 1, characterized in that: Each circuit board assembly has an integrated temperature sensor inside the core to reflect the internal temperature of the core in real time and perform temperature compensation on the core.