Clutter filter applied to wind speed verification system

Abstract

The utility model provides a clutter filter applied to a wind speed verification system. A filter circuit comprises inductors L1, L2, L3 and L4; a resistor R1; capacitors C0, C1, C2, C3, C4, C5, C6, C7 and C8 are realized; one end of the R1 is connected with the inductor L4, and the other end is grounded; the other end of the inductor L4 is respectively connected with one end of a capacitor C4, one end of a capacitor C8 and one end of an inductor L3; the other ends of the capacitors C4 and C8 are in signal grounding; the other end of the inductor L3 is respectively connected with one end of a capacitor C3, one end of a capacitor C7 and one end of an inductor L2; the other ends of the capacitors C3 and C7 are in signal grounding; the other end of the inductor L2 is connected with one end of the capacitor C2, one end of the capacitor C6 and one end of the inductor L1. The other ends of the capacitors C2 and C6 are in signal grounding; the other end of the inductor L1 is respectively connected with the capacitors C1 and C5, the capacitor C0 and the positive end of the power supply; the other ends of the capacitors C1, C5 and C0 are in signal grounding; the filter circuit can restrain interference of clutter signals, it is guaranteed that misjudgment does not occur any more in the verification process, and the efficiency of the wind speed verification system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a clutter filter applied to a wind speed verification system. Background Art

[0002] The wind speed calibration system is mainly used to calibrate the wind speed within the range of the wind sensor, which plays an important role in meteorological detection. However, the wind speed calibration system is easily interfered by other clutter signals. Once the calibration system reads the extreme value of the clutter signal during the calibration process, the wind sensor will fail the calibration. Interference occurs when the wind speed sensor starts to rotate or is about to stop rotating, especially at the start of the wind speed calibration point. This not only causes the calibration system to misjudge the wind sensor, but also seriously affects the calibration efficiency of the wind sensor. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a clutter filter applied to a wind speed calibration system to solve the problem of misjudgment of a wind sensor by the wind speed calibration system and suppress the interference of clutter signals.

[0004] To achieve the above object, the utility model provides a clutter filter applied to a wind speed verification system, the clutter filter includes a circuit board, a filter circuit is integrated on the circuit board, the filter circuit includes inductors L1, L2, L3, L4; a resistor R1; capacitors C0, C1, C2, C3, C4, C5, C6, C7, C8; one end of R1 is connected to the inductor L4, and the other end is grounded; the other end of the inductor L4 is respectively connected to the capacitors C4 and C8, and one end of the inductor L3 is connected The other end of capacitors C4 and C8 is signal-grounded; the other end of inductor L3 is respectively connected to capacitors C3, C7 and one end of inductor L2; the other end of capacitors C3 and C7 is signal-grounded; the other end of inductor L2 is respectively connected to capacitors C2, C6 and one end of inductor L1; the other end of capacitors C2 and C6 is signal-grounded; the other end of inductor L1 is respectively connected to capacitors C1, C5, capacitor C0 and the positive end of the power supply; the other ends of capacitors C1, C5 and capacitor C0 are signal-grounded; the negative end of the power supply is signal-grounded.

[0005] Furthermore, the filter circuit also includes a resistor, and the resistor is connected in series with the inductor L1.

[0006] Furthermore, the clutter filter also includes a filter housing, a first pipe, a cooling fan, a support rod, a first cooling hole, a second cooling hole, and a third cooling hole. The first cooling hole is arranged on both sides of the filter housing, and the third cooling hole is arranged on one side of the filter housing. The cooling fan is installed on one side inside the filter housing, and the air outlet end of the cooling fan is connected to the first pipe by a thread. The second cooling holes are arranged on both sides of the first pipe. The circuit board is installed in the first pipe, and two support rods are fixed under the circuit board.

[0007] Further, the first heat dissipation hole is installed with a dustproof net, the second heat dissipation hole is installed with a dustproof net, and the third heat dissipation hole is installed with a dustproof net.

[0008] Furthermore, an exhaust port is provided on one side of the filter housing, the exhaust port is connected to the first pipe via a thread, and a dustproof net is installed on the exhaust port.

[0009] Furthermore, the first heat dissipation hole and the second heat dissipation hole are respectively connected to the second pipe through threads.

[0010] Furthermore, a support plate is fixed on the top of the support rod, and a buckle is installed on the support plate, and the buckle is used to fix the circuit board.

[0011] Furthermore, a fault alarm is installed on one side of the filter housing, the fault alarm is located on one side of the cooling fan, a wind speed sensor is installed at the air outlet of the cooling fan, and the wind speed sensor is electrically connected to the fault alarm.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The clutter filter includes a circuit board, on which a filter circuit is integrated. The filter can suppress the interference of clutter signals, ensure that no misjudgment occurs during the calibration process, and improve the efficiency of the wind speed calibration system.

[0014] (2) The clutter filter blows the wind of the cooling fan to the circuit board more concentratedly through the first pipe. The connection between the second pipe and the first cooling hole and the second cooling hole can make the first pipe more stable. The first cooling hole, the second cooling hole and the exhaust port are arranged so that the circuit board can quickly dissipate heat while achieving a better dustproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of a filter circuit provided in Embodiment 1 of the present utility model.

[0017] Figure 2 It is a schematic diagram of the structure of the clutter filter provided in the second embodiment of the utility model.

[0018] In the figure, 1 is a filter housing, 2 is a first pipe, 3 is a second pipe, 4 is a cooling fan, 5 is a support rod, 6 is a first cooling hole, 7 is a second cooling hole, 8 is an exhaust port, 9 is a third cooling hole, 10 is a dust screen, 11 is a sensor, 12 is a fault alarm, 13 is a circuit board, and 14 is a support plate. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The enumerated embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] Embodiment 1

[0021] Reference Figure 1 The present embodiment provides a clutter filter applied to a wind speed verification system, the clutter filter includes a circuit board, a filter circuit is integrated on the circuit board, the filter circuit includes inductors L1, L2, L3, L4; a resistor R1; capacitors C0, C1, C2, C3, C4, C5, C6, C7, C8; one end of R1 is connected to the inductor L4, and the other end is grounded; the other end of the inductor L4 is respectively connected to the capacitors C4 and C8, and one end of the inductor L3; the capacitor The other end of C4 and C8 is signal grounded; the other end of inductor L3 is connected to capacitors C3, C7 and one end of inductor L2 respectively; the other end of capacitors C3 and C7 is signal grounded; the other end of inductor L2 is connected to capacitors C2, C6 and one end of inductor L1 respectively; the other end of capacitors C2 and C6 is signal grounded; the other end of inductor L1 is connected to capacitors C1, C5, capacitor C0 and the positive end of the power supply respectively; the other end of capacitors C1, C5 and capacitor C0 is signal grounded; the negative end of the power supply is signal grounded.

[0022] In the filter circuit provided in this embodiment, the function of the capacitor in the filter circuit is to transmit the low-frequency signal by blocking the high-frequency signal. Specifically, when the input signal passes through the filter circuit, the frequency of the high-frequency signal will exceed the cut-off frequency of the capacitor, and thus be weakened and blocked by the capacitor, and only the low-frequency signal can pass through the capacitor smoothly, thereby achieving the effect of low-pass filtering. Therefore, the capacitor plays the role of screening the low-frequency signal in the filter circuit.

[0023] The functions of inductors in filter circuits are (1) blocking high-frequency signals: Due to the frequency characteristics of inductors, they have a large resistance to high-frequency signals, thereby preventing high-frequency signals from passing through the filter circuit. This characteristic makes inductors very effective in blocking high-frequency interference signals and helps protect circuits from high-frequency noise interference. (2) Transmission of low-frequency signals: In contrast to blocking high-frequency signals, inductors have a small impedance to the transmission of low-frequency signals, allowing low-frequency signals to pass smoothly through the filter circuit. This characteristic makes inductors very useful in some applications that need to filter out high-frequency noise while retaining low-frequency signals. (3) Suppression of pulsating signals in power supplies: Inductors in filter circuits can suppress pulsating signals in power supplies. Inductors store energy, which makes the voltage have inertia when it changes, thereby reducing the pulsation size of the power supply. This is very important for the normal operation of precision instruments and sensitive circuits, and can effectively prevent circuit performance degradation or damage caused by power supply fluctuations. (4) Delay effect: In filter circuits, the energy storage characteristics of inductors will cause a delay effect after the signal passes through the inductor. This delay effect is very helpful for signal processing and matching, and can be used to adjust the signal phase, improve the signal waveform, etc.

[0024] The resistance in the filter circuit is 50Ω, which belongs to the characteristic impedance. The so-called characteristic impedance is the impedance determined by the characteristics of the line itself. The line impedance is determined by several factors: line width, copper thickness, and dielectric layer thickness. Once the PCB is designed, the impedance of each line is theoretically determined because the above factors have been determined. However, due to the influence of the manufacturing process, the variation of line width, the change of copper thickness, and the control of dielectric layer thickness will cause the impedance to change. For example, the coaxial line will be 50Ω or 75Ω; and the twisted pair (used for telephone and network communication) will be 100Ω.

[0025] Embodiment 2

[0026] Based on the above embodiment, the difference between this embodiment and the above embodiment is that:

[0027] Reference Figure 2The clutter filter also includes a filter housing 1, wherein the filter housing 1 is provided with a plurality of first heat dissipation holes 6 on both sides, an exhaust port 8 on one side and a third heat dissipation hole 9 on the other side, and the first heat dissipation hole 6, the exhaust port 8 and the third heat dissipation hole 9 are all installed with a dustproof net 10. The filter housing 1 is provided with a heat dissipation fan 4, a first pipe 2, a second pipe 3 and a fault alarm 12, the air outlet end of the heat dissipation fan 4 is connected to the first pipe 2 by a thread, the first pipe 2 is provided with a circuit board 13, a sensor 11 and a plurality of second heat dissipation holes 7 on both sides of the first pipe 2, two support rods 5 are fixed below the circuit board 13, a support plate 14 is fixed on the top of the support rod 5, and a buckle is installed on the support plate 14, the sensor 11 is electrically connected to the fault alarm 12, the second heat dissipation hole is installed with a dustproof net 10, and the first heat dissipation hole 6 is connected to the second heat dissipation hole 7 through a second pipe.

[0028] The clutter filter provided in this embodiment blows the wind force of the cooling fan 4 more concentratedly to the circuit board 13 through the first pipe 2, and then discharges the heat through the first heat dissipation hole 6, the second heat dissipation hole 7 and the exhaust port 8, and the first heat dissipation hole 6, the second heat dissipation hole 7 and the exhaust port 8 are respectively installed with a dustproof net 10, so that the circuit board can achieve rapid heat dissipation and dustproof effect. The circuit board is fixed by the support rod 5, the support plate 14 and the support plate buckle, so that the circuit board does not shake at will due to other factors. The second pipe 3 is connected to the first heat dissipation hole 6 and the second heat dissipation hole 7 respectively, so that the first pipe 2 is fixed more firmly. The wind speed sensor 11 detects the wind speed value of the cooling fan 4. When the wind speed value of the cooling fan 4 is less than the set wind speed value, the wind speed sensor 11 sends a signal to the fault alarm 12, and the fault alarm 12 sends an alarm to remind the staff that the cooling fan 4 has a fault, so that the staff can timely troubleshoot the fault. A dustproof net is installed through the third heat dissipation hole, so that the clutter filter can achieve dustproof effect while quickly dissipating heat.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clutter filter used in a wind speed calibration system, characterized in that: The clutter filter includes a circuit board, on which a filtering circuit is integrated, and the filtering circuit includes inductors L1, L2, L3, and L4; a resistor R1; and capacitors C0, C1, C2, C3, C4, C5, C6, C7, and C8; one end of R1 is connected to the inductor L4, and the other end is signal-grounded; the other end of the inductor L4 is respectively connected to capacitors C4 and C8, and one end of the inductor L3; the other ends of the capacitors C4 and C8 are signal-grounded; the other end of the inductor L3 is respectively connected to capacitors C3 and C7, and one end of the inductor L2; the other ends of the capacitors C3 and C7 are signal-grounded; the other end of the inductor L2 is respectively connected to capacitors C2 and C6, and one end of the inductor L1; the other ends of the capacitors C2 and C6 are signal-grounded; the other end of the inductor L1 is respectively connected to capacitors C1 and C5, capacitor C0, and the positive end of the power supply; the other ends of the capacitors C1, C5, and capacitor C0 are signal-grounded; and the negative end of the power supply is signal-grounded.

2. The clutter filter used in the wind speed verification system according to claim 1, characterized in that: The filter circuit further includes a resistor, and the resistor is connected in series with the inductor L1.

3. The clutter filter used in the wind speed verification system according to claim 1, characterized in that: The clutter filter also includes a filter housing, a first pipe, a cooling fan, a support rod, a first cooling hole, a second cooling hole, and a third cooling hole. The first cooling hole is arranged on both sides of the filter housing, and the third cooling hole is arranged on one side of the filter housing. The cooling fan is installed on one side inside the filter housing, and the air outlet end of the cooling fan is connected to the first pipe by a thread. The second cooling holes are arranged on both sides of the first pipe. The circuit board is installed in the first pipe, and two support rods are fixed under the circuit board.

4. The clutter filter used in the wind speed verification system according to claim 3, characterized in that: The first heat dissipation hole is installed with a dustproof net, the second heat dissipation hole is installed with a dustproof net, and the third heat dissipation hole is installed with a dustproof net.

5. The clutter filter used in the wind speed verification system according to claim 3, characterized in that: An exhaust port is also provided on one side of the filter housing. The exhaust port is connected to the first pipe via a thread, and a dustproof net is installed on the exhaust port.

6. The clutter filter used in the wind speed verification system according to claim 3, characterized in that: The first heat dissipation hole and the second heat dissipation hole are respectively connected to the second pipe through threads.

7. The clutter filter used in the wind speed verification system according to claim 3, characterized in that: A support plate is fixed on the top of the support rod, and a buckle is installed on the support plate, and the buckle is used to fix the circuit board.

8. The clutter filter used in the wind speed verification system according to claim 3, characterized in that: A fault alarm is installed at one side of the filter housing, and the fault alarm is located at one side of the heat dissipation fan. A wind speed sensor is installed at the air outlet of the heat dissipation fan, and the wind speed sensor is electrically connected to the fault alarm.

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