CN114337598A - High-pass high-order filtering device - Google Patents
High-pass high-order filtering device Download PDFInfo
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- CN114337598A CN114337598A CN202011046185.1A CN202011046185A CN114337598A CN 114337598 A CN114337598 A CN 114337598A CN 202011046185 A CN202011046185 A CN 202011046185A CN 114337598 A CN114337598 A CN 114337598A
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Abstract
The invention relates to a high-pass high-order filtering device which comprises a protection circuit for preventing an input signal from being interfered and a three-stage filtering circuit for attenuating signals of 8.82kHz and 26.46kHz, wherein the input end of the protection circuit is connected with a signal source, and the output end of the protection circuit is connected with the three-stage filtering circuit. Compared with the prior art, the invention only uses the conventional integrated circuit device with high reliability and the resistance-capacitance device, and adds the interface protection circuit, thereby ensuring the stable operation of the circuit, having good circuit stability, no resonance, small energy loss and no need of electromagnetic shielding.
Description
Technical Field
The invention relates to the field of railway communication, in particular to a high-pass high-order filtering device.
Background
Some alternating current signals are generally subjected to filtering processing in a train-ground communication test of a subway CBTC signal system, and the specific filtering requirements are as follows: the attenuation of 8.82kHz is more than or equal to 50dB, and the attenuation of 26.46kHz is less than or equal to 2 dB. Namely: the attenuation is 50dB in a frequency range of about 20k, obviously, the attenuation gradient is too large, the common low-order passive filter is difficult to accurately meet the requirement, signals in a passband of the passive filter have energy loss, the load effect is obvious, electromagnetic induction is easily caused if an inductance element is used, the size and the weight of the filter are large when the inductance L is large, and the filter is not suitable for a low frequency range.
Disclosure of Invention
The invention aims to provide a high-pass high-order filtering device, which only uses conventional integrated circuit devices with high reliability and resistance-capacitance devices, is additionally provided with an interface protection circuit, ensures stable circuit operation, has good circuit stability, can not generate resonance, has small energy loss and does not need electromagnetic shielding.
The purpose of the invention can be realized by the following technical scheme:
a high-pass high-order filtering device comprises a protection circuit for preventing an input signal from being interfered, and a three-stage filtering circuit for attenuating signals of 8.82kHz and 26.46kHz, wherein the input end of the protection circuit is connected with a signal source, and the output end of the protection circuit is connected with the three-stage filtering circuit.
Further, the protection circuit includes a first transient suppression tube, a second transient suppression tube and a third transient suppression tube, the first transient suppression tube is disposed between the positive input end and the ground end of the signal source, the second transient suppression tube is disposed between the negative input end and the ground end of the signal source, and the third transient suppression tube is disposed between the positive input end and the negative input end of the signal source.
Furthermore, the first transient suppression tube, the second transient suppression tube and the third transient suppression tube are all P6KE 12C.
Furthermore, the three-stage filter circuit comprises a first-stage filter circuit, a second-stage filter circuit and a third-stage filter circuit which are connected in sequence.
Furthermore, the first-stage filter circuit comprises a first operational amplifier, a first filter capacitor, a second filter capacitor, a first filter resistor and a first ground resistor, wherein one end of the first filter capacitor is connected to the output end of the protection circuit, the other end of the first filter capacitor is connected with one end of the first filter resistor and one end of the second filter capacitor respectively, the other end of the second filter capacitor is connected to the positive phase input end of the first operational amplifier and is grounded through the first ground resistor, and the other end of the first filter resistor is connected to the negative phase input end and the output end of the first operational amplifier.
Still further, the capacitance values of the first filter capacitor and the second filter capacitor are both 1nF, the resistance value of the first filter resistor is 6.2k Ω, and the resistance value of the first ground resistor is 6.6k Ω.
Furthermore, the second stage filter circuit comprises a second operational amplifier, a third filter capacitor, a fourth filter capacitor, a second filter resistor and a second ground resistor, wherein one end of the third filter capacitor is connected to the output end of the first stage filter circuit, the other end of the third filter capacitor is connected to one end of the second filter resistor and one end of the fourth filter capacitor respectively, the other end of the fourth filter capacitor is connected to the positive phase input end of the second operational amplifier and is grounded through the second ground resistor, and the other end of the second filter resistor is connected to the negative phase input end and the output end of the second operational amplifier.
Still further, the capacitance values of the third filter capacitor and the fourth filter capacitor are both 1nF, the resistance value of the second filter resistor is 4.5k Ω, and the resistance value of the second ground resistor is 9k Ω.
Furthermore, the third stage filter circuit comprises a third operational amplifier, a fifth filter capacitor, a sixth filter capacitor, a third filter resistor and a third ground resistor, wherein one end of the fifth filter capacitor is connected to the output end of the second stage filter circuit, the other end of the fifth filter capacitor is respectively connected to one end of the third filter resistor and one end of the sixth filter capacitor, the other end of the sixth filter capacitor is connected to the positive phase input end of the third operational amplifier and is grounded through the third ground resistor, and the other end of the third filter resistor is connected to the negative phase input end and the output end of the third operational amplifier.
Still further, the capacitance values of the fifth filter capacitor and the sixth filter capacitor are both 1nF, the resistance value of the third filter resistor is 1.6k Ω, and the resistance value of the third ground resistor is 24.6k Ω.
Compared with the prior art, the invention has the following beneficial effects: only conventional integrated circuit devices with high reliability and resistance-capacitance devices are used, and an interface protection circuit is added, so that the circuit is stable in operation, good in stability, free of resonance, low in energy loss and free of electromagnetic shielding. And because only suitable for the integrated circuit device and resistance-capacitance device that conventional reliability is high, the circuit is small, light, still convenient to use and popularize.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram for implementing the embodiment of the present invention;
wherein: 1. the protection circuit comprises a protection circuit, 2, a first-stage filter circuit, 3, a second-stage filter circuit, 4, a third-stage filter circuit, Z1, a first transient suppression tube, Z2, a second transient suppression tube, Z3, a third transient suppression tube, C1, a first filter capacitor, C2, a second-stage filter circuit, C3, a third filter capacitor, C4, a fourth filter capacitor, C5, a fifth filter capacitor, C6, a sixth filter capacitor, R1, a first filter resistor, R2, a first grounding resistor, R3, a second filter resistor, R4, a second grounding resistor, R5, a third filter resistor, R6, a third grounding resistor, U1, a first operational amplifier, U2, a second operational amplifier, U3 and a third operational amplifier.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A high-pass high-order filtering device is shown in fig. 1 and fig. 2, and comprises a protection circuit 1 for preventing an input signal from being interfered, and a three-stage filtering circuit for attenuating signals of 8.82kHz and 26.46kHz, wherein an input end of the protection circuit 1 is connected with a signal source, and an output end of the protection circuit is connected with the three-stage filtering circuit.
The protection circuit 1 comprises a first transient suppression tube Z1, a second transient suppression tube Z2 and a third transient suppression tube Z3, wherein the first transient suppression tube Z1 is arranged between the positive input end and the grounding end of the signal source, the second transient suppression tube Z2 is arranged between the negative input end and the grounding end of the signal source, and the third transient suppression tube Z3 is arranged between the positive input end and the negative input end of the signal source. The first transient suppressor tube Z1, the second transient suppressor tube Z2 and the third transient suppressor tube Z3 are all P6KE 12C. Z1 and Z2 belong to a longitudinal protection circuit 1 and mainly prevent interference between positive and negative input signals and the ground, and Z3 belongs to a transverse protection circuit and mainly prevent mutual interference between the positive and negative input signals.
The three-stage filter circuit comprises a first-stage filter circuit 2, a second-stage filter circuit C23 and a third-stage filter circuit 4 which are connected in sequence.
The first-stage filter circuit 2 comprises a first operational amplifier resistor U1, a first filter capacitor C1, a second filter capacitor, a first filter resistor R1 and a first ground resistor R2, one end of the first filter capacitor C1 is connected to the output end of the protection circuit 1, the other end of the first filter capacitor C1 is connected to one end of a first filter resistor R1 and one end of a second filter capacitor R2 respectively, the other end of the second filter capacitor C1 is connected to the positive input end of the first operational amplifier resistor U1 and is grounded through the first ground resistor R2, and the other end of the first filter resistor R1 is connected to the negative input end and the output end of the first operational amplifier resistor U1.
The capacitance values of the first filter capacitor C1 and the second filter capacitor are both 1nF, the resistance value of the first filter resistor R1 is 6.2k omega, and the resistance value of the first grounding resistor R2 is 6.6k omega.
The second stage filter circuit C23 includes a second operational amplifier resistor U2, a third filter capacitor C3, a fourth filter capacitor C4, a second filter resistor R3 and a second ground resistor R4, one end of the third filter capacitor C3 is connected to the output end of the first stage filter circuit 2, the other end of the third filter capacitor C3 is connected to one end of the second filter resistor R3 and one end of the fourth filter capacitor C4, the other end of the fourth filter capacitor C4 is connected to the non-inverting input end of the second operational amplifier resistor U2 and is grounded through a second ground resistor R4, and the other end of the second filter resistor R3 is connected to the inverting input end and the output end of the second operational amplifier resistor U2.
The capacitance values of the third filter capacitor C3 and the fourth filter capacitor C4 are both 1nF, the resistance value of the second filter resistor R3 is 4.5k omega, and the resistance value of the second grounding resistor R4 is 9k omega.
The third stage filter circuit 4 includes a third operational amplifier resistor U3, a fifth filter capacitor C5, a sixth filter capacitor C6, a third filter resistor R5 and a third ground resistor R6, one end of the fifth filter capacitor C5 is connected to the output end of the second stage filter circuit C23, the other end of the fifth filter capacitor C5 is connected to one end of the third filter resistor R5 and one end of the sixth filter capacitor C6, the other end of the sixth filter capacitor C6 is connected to the non-inverting input end of the third operational amplifier resistor U3 and is grounded through a third ground resistor R6, and the other end of the third filter resistor R5 is connected to the inverting input end and the output end of the third operational amplifier resistor U3.
The capacitance values of the fifth filter capacitor C5 and the sixth filter capacitor C6 are both 1nF, the resistance value of the third filter resistor R5 is 1.6k omega, and the resistance value of the third grounding resistor R6 is 24.6k omega.
The circuit structure is tested by taking 5V signal input voltage as an example, and the result is as follows:
1. first stage filter circuit 2: the 8.82kHz signal attenuates by 18.94dB and the 26.64kHz signal attenuates by 5.18 dB. (not reaching the expected output target value: 8.82kHz attenuation is more than or equal to 50dB, and 26.46kHz attenuation is less than or equal to 2dB)
2. Second stage filter circuit C23: attenuation of the 8.82kHz signal is 37.11 dB; the 26.64kHz signal is attenuated by 7.67 dB. (not reaching the expected output target value: 8.82kHz attenuation is more than or equal to 50dB, and 26.46kHz attenuation is less than or equal to 2dB)
3. Third stage filter circuit 4: 8.82kHz signal attenuation 54.52 dB; the 26.64kHz signal is attenuated by 1.56 dB. (achieving the desired output target: 8.82 attenuation kHz is more than or equal to 50dB, 26.46kHz attenuation is less than or equal to 2dB)
As above, the application only uses the conventional integrated circuit device with high reliability and the resistance-capacitance device, and the interface protection circuit 1 is added, so that the circuit is stable in work, good in circuit stability, free of resonance, low in energy loss and free of electromagnetic shielding. And because only suitable for the integrated circuit device and resistance-capacitance device that conventional reliability is high, the circuit is small, light, still convenient to use and popularize.
The application and the defect that the conventional high-pass high-order filtering device which meets the requirements and can ensure railway communication is large in size are overcome, and the problem that a filtering circuit formed by the conventional resistance-capacitance device cannot meet the railway communication signal guarantee is also solved.
Claims (10)
1. A high-pass high-order filtering device is characterized by comprising a protection circuit for preventing an input signal from being interfered, and a three-stage filtering circuit for attenuating signals of 8.82kHz and 26.46kHz, wherein the input end of the protection circuit is connected with a signal source, and the output end of the protection circuit is connected with the three-stage filtering circuit.
2. A high-pass high-order filter apparatus according to claim 1, wherein the protection circuit comprises a first transient suppression tube, a second transient suppression tube and a third transient suppression tube, the first transient suppression tube is disposed between the positive input terminal and the ground terminal of the signal source, the second transient suppression tube is disposed between the negative input terminal and the ground terminal of the signal source, and the third transient suppression tube is disposed between the positive input terminal and the negative input terminal of the signal source.
3. The high-pass high-order filtering device according to claim 1, wherein the first transient suppression tube, the second transient suppression tube and the third transient suppression tube are P6KE 12C.
4. The high-pass high-order filtering device according to claim 1, wherein the three-stage filtering circuit comprises a first stage filtering circuit, a second stage filtering circuit and a third stage filtering circuit which are connected in sequence.
5. The high-pass high-order filtering device according to claim 4, wherein the first-stage filtering circuit comprises a first operational amplifier, a first filtering capacitor, a second filtering capacitor, a first filtering resistor and a first ground resistor, one end of the first filtering capacitor is connected to the output end of the protection circuit, the other end of the first filtering capacitor is connected to one end of the first filtering resistor and one end of the second filtering capacitor, respectively, the other end of the second filtering capacitor is connected to the non-inverting input end of the first operational amplifier and is grounded through the first ground resistor, and the other end of the first filtering resistor is connected to the inverting input end and the output end of the first operational amplifier.
6. A high-pass high-order filtering device according to claim 5, wherein the capacitance values of said first filtering capacitor and said second filtering capacitor are both 1nF, the resistance value of said first filtering resistor is 6.2k Ω, and the resistance value of said first grounding resistor is 6.6k Ω.
7. The high-pass high-order filtering apparatus according to claim 4, wherein the second-stage filtering circuit comprises a second operational amplifier, a third filtering capacitor, a fourth filtering capacitor, a second filtering resistor and a second ground resistor, one end of the third filtering capacitor is connected to the output terminal of the first-stage filtering circuit, the other end of the third filtering capacitor is connected to one end of the second filtering resistor and one end of the fourth filtering capacitor, respectively, the other end of the fourth filtering capacitor is connected to the non-inverting input terminal of the second operational amplifier and is grounded through the second ground resistor, and the other end of the second filtering resistor is connected to the inverting input terminal and the output terminal of the second operational amplifier.
8. The high-pass high-order filtering device as claimed in claim 7, wherein the capacitance values of the third filtering capacitor and the fourth filtering capacitor are both 1nF, the resistance value of the second filtering resistor is 4.5k Ω, and the resistance value of the second grounding resistor is 9k Ω.
9. The high-pass high-order filtering device according to claim 4, wherein the third-stage filtering circuit comprises a third operational amplifier, a fifth filtering capacitor, a sixth filtering capacitor, a third filtering resistor and a third ground resistor, one end of the fifth filtering capacitor is connected to the output terminal of the second-stage filtering circuit, the other end of the fifth filtering capacitor is connected to one end of the third filtering resistor and one end of the sixth filtering capacitor, respectively, the other end of the sixth filtering capacitor is connected to the non-inverting input terminal of the third operational amplifier and is grounded through the third ground resistor, and the other end of the third filtering resistor is connected to the inverting input terminal and the output terminal of the third operational amplifier.
10. The high-pass high-order filtering device according to claim 9, wherein the capacitance values of the fifth filtering capacitor and the sixth filtering capacitor are both 1nF, the resistance value of the third filtering resistor is 1.6k Ω, and the resistance value of the third grounding resistor is 24.6k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011046185.1A CN114337598A (en) | 2020-09-29 | 2020-09-29 | High-pass high-order filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011046185.1A CN114337598A (en) | 2020-09-29 | 2020-09-29 | High-pass high-order filtering device |
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| Publication Number | Publication Date |
|---|---|
| CN114337598A true CN114337598A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011046185.1A Pending CN114337598A (en) | 2020-09-29 | 2020-09-29 | High-pass high-order filtering device |
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| CN (1) | CN114337598A (en) |
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2020
- 2020-09-29 CN CN202011046185.1A patent/CN114337598A/en active Pending
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