CN218633879U - Filter amplifying circuit applied to lightning monitoring - Google Patents
Filter amplifying circuit applied to lightning monitoring Download PDFInfo
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- CN218633879U CN218633879U CN202222796557.3U CN202222796557U CN218633879U CN 218633879 U CN218633879 U CN 218633879U CN 202222796557 U CN202222796557 U CN 202222796557U CN 218633879 U CN218633879 U CN 218633879U
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Abstract
The utility model discloses a be applied to filter amplifier circuit of thunder and lightning monitoring, include: power input module, input voltage clamping module, low pass filter module, voltage amplification and voltage follow module, high pass filter module, line drive output module, wherein: the power input module is connected with input voltage clamping module, voltage amplification and voltage following module, line drive output module respectively, input voltage clamping module is connected with low pass filter module, be equipped with two reverse parallelly connected diodes on the input voltage clamping module, low pass filter module is connected with voltage amplification and voltage following module, voltage amplification and voltage following module are connected with high pass filter module, high pass filter module is connected with line drive output module, the utility model discloses can amplify the signal in the very low frequency channel effectively steadily, all the other frequency channels of filtering signal, and be difficult for receiving external environment and disturb.
Description
Technical Field
The utility model relates to a be applied to filter amplifier circuit of thunder and lightning monitoring belongs to filter amplifier circuit technical field.
Background
In modern communication equipment and various control systems, a filter amplifying circuit is widely applied, and the circuit is commonly used in engineering to realize functions of signal amplification, frequency selection, interference suppression and the like. Meanwhile, with the development of atmospheric science, the importance of lightning monitoring and early warning is gradually improved. Although the lightning signal radiates electromagnetic energy in an extremely wide frequency band, most of the energy is distributed in a very low frequency (3 kHz-30 kHz) and a part of the extremely low frequency band, so that in related researches, only the lightning signal in the frequency band needs to be processed. Therefore, the filter amplifying circuit has important significance in a lightning monitoring system and directly influences the performance of the whole system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a be applied to filter amplifier circuit of thunder and lightning monitoring, can stably amplify the signal in the very low frequency channel effectively, all the other frequency channels of filtering signal, and be difficult for receiving external environment interference.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a be applied to filter amplifier circuit of thunder and lightning monitoring, include: power input module, input voltage clamping module, low pass filter module, voltage amplification and voltage follow module, high pass filter module, line drive output module, wherein:
the power supply input module is respectively connected with an input voltage clamping module, a voltage amplifying and voltage following module and a line driving output module, the input voltage clamping module is connected with a low-pass filter module, two diodes which are reversely connected in parallel are arranged on the input voltage clamping module, the low-pass filter module is connected with the voltage amplifying and voltage following module, the voltage amplifying and voltage following module is connected with a high-pass filter module, and the high-pass filter module is connected with the line driving output module.
Furthermore, the power input module inputs a clamping voltage to the input voltage clamping module, and simultaneously provides a power supply to the voltage amplifying and voltage following module and the line driving output module.
Furthermore, the input voltage clamping module limits the magnitude of the external input signal to the signal voltage through two diodes which are connected in parallel in an opposite direction and then outputs the external input signal to the low-pass filtering module.
Further, the low-pass filtering module adopts RC low-pass filtering and outputs the signal to the voltage amplifying and voltage following module.
Furthermore, an SGM8276B chip is arranged in the voltage amplifying and voltage following module, and the signal is output to the high-pass filtering module.
Furthermore, the high-pass filter module processes the signal by using an RCR high-pass filter circuit, and outputs the signal to the line driving output module.
Furthermore, the line driving output module adopts an SSM2142 chip to drive and output signals.
Compared with the prior art, the utility model discloses the beneficial effect who reaches:
1. the input end circuit uses two reverse parallel diodes to realize the function of voltage clamping. The input voltage range is limited, and the damage of external impact signals to components on the circuit board is avoided;
2. the chip with the domestic SGM8276B model is used, so that the problem that the special chip is limited by foreign countries during batch production is solved, and the production cost is greatly reduced;
3. through low-pass filtering and high-pass filtering, the band-pass filtering effect is achieved, and the very-low-frequency band component of the signal is effectively selected.
Drawings
Fig. 1 is a schematic diagram of a power input module and a signal input voltage clamping module of the present invention;
fig. 2 is a schematic diagram of a low pass filtering module of the present invention;
fig. 3 is a schematic diagram of the voltage amplification following module of the present invention;
fig. 4 is a schematic diagram of the high pass filter module and the line drive output module of the present invention;
fig. 5 is a schematic structural diagram of the present invention;
fig. 6 is an input/output graph of the present invention;
fig. 7 is a graph of the amplitude-frequency characteristic of the present invention;
fig. 8 is a phase-frequency characteristic diagram of the present invention.
In the figure: 1. a DC power supply interface; 2. an output interface; 3. a gasket; 4. mounting an aluminum shell; 5. a PCB board; 6. a lower aluminum shell; 7. and an input interface.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
This embodiment introduces a filtering and amplifying circuit for lightning monitoring, includes: power input module, input voltage clamping module, low pass filter module, voltage amplification and voltage follow module, high pass filter module, line drive output module, wherein:
the power supply input module is respectively connected with an input voltage clamping module, a voltage amplifying and voltage following module and a line driving output module, the input voltage clamping module is connected with a low-pass filtering module, two diodes which are reversely connected in parallel are arranged on the input voltage clamping module, the low-pass filtering module is connected with the voltage amplifying and voltage following module, the voltage amplifying and voltage following module is connected with a high-pass filtering module, and the high-pass filtering module is connected with the line driving output module.
The power input module inputs clamping voltage to the input voltage clamping module and simultaneously provides power for the voltage amplification and voltage following module and the line driving output module.
The input voltage clamping module limits the magnitude of an external input signal to a signal voltage through two reverse parallel diodes and then outputs the signal voltage to the low-pass filtering module.
The low-pass filtering module adopts RC low-pass filtering and outputs signals to the voltage amplifying and voltage following module.
An SGM8276B chip is arranged in the voltage amplifying and voltage following module, the voltage amplifying and voltage following functions are achieved, and signals are output to the high-pass filtering module.
The high-pass filtering module processes the signals by adopting an RCR high-pass filtering circuit and outputs the signals to the line driving output module.
The circuit driving output module adopts an SSM2142 chip, and further amplifies and drives output of the input signal voltage.
The contents designed in the above embodiments will be described below with reference to the drawings of the specification.
As shown in fig. 1 to 4, the filter amplifier circuit includes A, B, C, D, E, F six modules. The module A is a power input module, the module B is a signal input voltage clamping module, the module C is a low-pass filtering module, the module D is a voltage amplification following module, the module E is a high-pass filtering module, and the module F is a line driving output module.
The module A consists of a +/-12V direct-current power supply, two 10nF decoupling capacitors and two 10uF decoupling capacitors, high-frequency and low-frequency components of the direct-current power supply are filtered, the direct-current power supply is more stable, and the whole filtering and amplifying circuit is powered. Module a provides a clamp voltage to module B while providing a 12V power supply to the chips in module D and module F.
The module B consists of two diodes which are connected in parallel in an opposite direction and a current-limiting resistor, carries out voltage clamping on an external input signal, limits the signal voltage within +/-12.7V, and then outputs the signal voltage to the module C.
The filtering part of the module C consists of a 9-stage 20k omega resistor and a 1pF capacitor, effectively filters out high-frequency components of an input signal, and then outputs the signal to the module D.
The module D adopts a chip of a domestic SGM8276B model, amplifies the signal voltage by nearly 10 times through voltage negative feedback, plays a role of voltage following, and outputs the signal to the module E after buffering.
Furthermore, the high-pass filtering part of the module E consists of a 10M omega resistor, a 100nF capacitor and a 1M omega resistor, and frequency components of signals lower than 300Hz are effectively filtered by adopting resistance-capacitance-resistance (RCR) filtering, so that the whole circuit realizes a band-pass filtering effect, and finally the signals are output to the module F.
The module F uses an SSM2142 chip to further amplify the signal voltage input in E and convert it into a pair of balanced output signals with high output driving capability.
In the process of monitoring the lightning signals, the electrostatic shielding property of the aluminum shell is fully utilized, and the influence of impurity signals such as electromagnetic radiation of the external environment on the filter amplifying circuit is avoided. Fig. 5 is the utility model installation schematic diagram, include: the direct-current power supply comprises a direct-current power supply interface 1, an output interface 2, a gasket 3, an upper aluminum shell 4, a PCB (printed circuit board) 5, a lower aluminum shell 6 and an input interface 7, wherein a circuit board is arranged in a totally-enclosed aluminum box, and grounding screw holes are designed at four corners of the circuit board, so that the influence of electromagnetic radiation of the surrounding environment on the circuit board can be effectively reduced;
in order to verify the utility model discloses a circuit filtering and amplifying performance adopts EDA simulation software named Multisim to simulate the circuit principle, observes oscilloscope and baud appearance, obtains output signal and initial input signal curve, amplitude-frequency curve and phase-frequency curve respectively. The results are shown in fig. 6, 7 and 8, respectively.
The initial input signal is a sine wave with the amplitude of 400mV and the frequency of 10kHz, which can be obtained from FIG. 6, and after passing through the filtering and amplifying circuit, the voltage of the output signal is amplified by about 17 times, and the frequency and the phase are not changed. Similarly, looking at fig. 7 and 8, it is also possible to obtain an amplifier circuit with a gain of about 24.6dB and a phase angle close to 0 at a frequency of 10 kHz.
Meanwhile, by observing the amplitude-frequency characteristic curve, the circuit can realize a good band-pass filtering effect, and aiming at the frequency component which is more than 30kHz in the input signal, the attenuation speed of the amplitude-frequency curve is high, and the effect of filtering the high-frequency component is better than that of a conventional Chebyshev filter.
Further, the actual 3dB bandwidth and 0dB bandwidth of the filtering and amplifying circuit of the utility model are measured, and the results are shown in table 1:
table 1 3dB bandwidth and 0dB bandwidth of the filter amplifier circuit,
obtain by actual test result, the utility model discloses a filter amplifier circuit's 3dB frequency range is 2.767kHz ~ 37.886KHz, fine selection signal very low frequency (3 kHz-30 kHz) frequency channel component, effectively get rid of all the other frequency channel components, this and the most radiant frequency channel highly uniform of thunder and lightning signal energy. Simultaneously, the actual measurement goes out the utility model discloses the circuit magnification is 17.8 times, also very is close with the emulation result. In conclusion, can obtain the utility model discloses a monitoring of thunder and lightning signal provides anticipated filtering amplification effect.
The utility model discloses beneficial effect who has:
1. the input end circuit uses two reverse parallel diodes to realize the function of voltage clamping. The input voltage range is limited within +/-12.7V, and the damage of external impact signals to components on the circuit board is avoided;
2. the chip with the domestic SGM8276B model is used, so that the problem that the special chip is limited by foreign countries during batch production is solved, and the production cost is greatly reduced;
3. the band-pass filtering method adopts 9-level resistance-capacitance (RC) low-pass filtering and is matched with resistance-capacitance-resistance (RCR) high-pass filtering to realize the band-pass filtering effect and effectively select the very low frequency band component of the signal.
4. The circuit board is arranged in a totally-enclosed aluminum box, and the four corners of the circuit board are provided with grounding screw holes, so that the influence of the electromagnetic radiation of the surrounding environment on the circuit board can be effectively reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (7)
1. A filter amplification circuit applied to lightning monitoring is characterized by comprising: power input module, input voltage clamping module, low pass filter module, voltage amplification and voltage follow module, high pass filter module, line drive output module, wherein:
the power supply input module is respectively connected with an input voltage clamping module, a voltage amplifying and voltage following module and a line driving output module, the input voltage clamping module is connected with a low-pass filtering module, two diodes which are reversely connected in parallel are arranged on the input voltage clamping module, the low-pass filtering module is connected with the voltage amplifying and voltage following module, the voltage amplifying and voltage following module is connected with a high-pass filtering module, and the high-pass filtering module is connected with the line driving output module.
2. The filter amplifier circuit applied to lightning monitoring of claim 1, wherein: the power input module inputs clamping voltage to the input voltage clamping module and simultaneously provides power for the voltage amplification and voltage following module and the line driving output module.
3. The filter amplifier circuit applied to lightning monitoring of claim 1, wherein: the input voltage clamping module limits the magnitude of an external input signal to a signal voltage through two reverse parallel diodes and then outputs the signal voltage to the low-pass filtering module.
4. The filter amplification circuit applied to lightning monitoring of claim 1, wherein: the low-pass filtering module adopts RC low-pass filtering and outputs signals to the voltage amplifying and voltage following module.
5. The filter amplification circuit applied to lightning monitoring of claim 1, wherein: and an SGM8276B chip is arranged in the voltage amplifying and voltage following module and outputs signals to the high-pass filtering module.
6. The filter amplification circuit applied to lightning monitoring of claim 1, wherein: the high-pass filtering module processes the signals by adopting an RCR high-pass filtering circuit and outputs the signals to the line driving output module.
7. The filter amplification circuit applied to lightning monitoring of claim 1, wherein: the line driving output module adopts an SSM2142 chip to drive and output signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222796557.3U CN218633879U (en) | 2022-10-24 | 2022-10-24 | Filter amplifying circuit applied to lightning monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222796557.3U CN218633879U (en) | 2022-10-24 | 2022-10-24 | Filter amplifying circuit applied to lightning monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218633879U true CN218633879U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222796557.3U Active CN218633879U (en) | 2022-10-24 | 2022-10-24 | Filter amplifying circuit applied to lightning monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218633879U (en) |
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2022
- 2022-10-24 CN CN202222796557.3U patent/CN218633879U/en active Active
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