CN214014205U - Protection filter circuit of communication bus signal - Google Patents
Protection filter circuit of communication bus signal Download PDFInfo
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- CN214014205U CN214014205U CN202022760957.XU CN202022760957U CN214014205U CN 214014205 U CN214014205 U CN 214014205U CN 202022760957 U CN202022760957 U CN 202022760957U CN 214014205 U CN214014205 U CN 214014205U
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- mode inductor
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Abstract
The utility model discloses a communication bus signal's protection filter circuit, including first TVS pipe, second TVS pipe, first common mode inductor, first condenser, second common mode inductor. The utility model discloses a communication bus signal's anti-interference frequency range can be widened in the common mode inductor's of different inductance values combined use, uses through common mode capacitor and common mode inductor's combination, can improve communication bus signal's anti-interference amplitude, can guarantee again simultaneously that filtering protection circuit does not influence communication bus's normal transmission.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a communication bus signal's protection filter circuit.
Background
The conventional communication bus signal filter circuit only carries out filtering through a capacitor, often cannot achieve an ideal filtering effect, is poor in anti-jamming capability, is often sensitive in a sensitivity test of electromagnetic compatibility, and cannot meet the requirements of the sensitivity test and lightning protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem of failure of electromagnetic compatibility sensitivity test of communication bus signals such as RS422 and RS485, and simultaneously ensure that the communication bus signals meet the 3-level lightning protection requirement of stitch injection, and provide a protective filter circuit of the communication bus signals, which comprises a first TVS tube, a second TVS tube, a first common mode inductor, a first capacitor, a second capacitor and a second common mode inductor; the first TVS tube and the second TVS tube are used for lightning protection and peak voltage suppression of a communication bus; the first end of the first TVS tube is connected with the first input end of the first common mode inductor; the first end of the second TVS tube is connected with the second input end of the first common mode inductor; the first input end of the first common mode inductor and the second input end of the first common mode inductor are used for communication bus signal input; the first output end of the first common-mode inductor is connected with the first end of the first capacitor and the first input end of the second common-mode inductor; the second output end of the first common-mode inductor is connected with the second end of the second capacitor and the second input end of the second common-mode inductor; the second end of the first capacitor and the first end of the second capacitor are grounded; the first output end of the second common mode inductor and the second output end of the second common mode inductor are used for communication bus signal output.
The beneficial effects of the utility model reside in that: the utility model discloses a communication bus signal's anti-interference frequency range can be widened in the common mode inductor's of different inductance values combined use, uses through common mode capacitor and common mode inductor's combination, can improve communication bus signal's anti-interference amplitude, can guarantee again simultaneously that filtering protection circuit does not influence communication bus's normal transmission.
Drawings
Fig. 1 is a circuit diagram of the present invention.
In the figure: IN + -a first input of a first common mode inductor; IN-a second input of the first common mode inductor; l1 — first common mode inductor; l2 — second common mode inductor; c1 — first capacitor; c2 — second capacitor; v1 — first TVS tube; v2 — second TVS tube.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the utility model relates to a protection filter circuit for communication bus signals, which comprises a first TVS tube, a second TVS tube, a first common mode inductor, a first capacitor, a second capacitor, and a second common mode inductor; the first TVS tube and the second TVS tube are used for lightning protection and peak voltage suppression of a communication bus; the first end of the first TVS tube is connected with the first input end of the first common mode inductor; the first end of the second TVS tube is connected with the second input end of the first common mode inductor; the first input end of the first common mode inductor and the second input end of the first common mode inductor are used for communication bus signal input; the first output end of the first common-mode inductor is connected with the first end of the first capacitor and the first input end of the second common-mode inductor; the second output end of the first common-mode inductor is connected with the second end of the second capacitor and the second input end of the second common-mode inductor; the second end of the first capacitor and the first end of the second capacitor are grounded; the first output end of the second common mode inductor and the second output end of the second common mode inductor are used for communication bus signal output.
Preferably, the inductance of the first common mode inductor is different from that of the second common mode inductor.
When a peak voltage exceeding the breakdown voltage of the TVS transistor occurs between the receiver + or receiver-and ground, as shown in fig. 1, the TVS transistor breaks down into a low impedance mode to clamp the peak voltage within the safe voltage range of the subsequent circuit, thereby protecting the subsequent circuit. In this embodiment, SMBJ6.0CA TVS transistor is used, and the breakdown voltage of the TVS transistor can be adjusted according to the operating voltage range of the subsequent circuit.
And filtering the common-mode interference signal on the communication bus by using a common-mode filter device. The frequency band of an interference signal which is easily sensitive to a communication bus signal is 100 MHz-300 MHz, an inductor with L1 of 5 mu H, L2 of 20 mu H and capacitors with C1 and C2 of 1000pF are selected, the anti-interference frequency range of the communication bus signal can be widened by combining the common mode inductors with different inductance values, the anti-interference amplitude of the communication bus signal can be improved by combining the common mode capacitors and the common mode inductors, and meanwhile, the normal transmission of the communication bus can not be influenced by a filter protection circuit.
The utility model discloses can guarantee that communication buses such as RS422, RS485 satisfy 3 grades of stitches of stipulating in RTAC/DO-160G (lightning induction transient sensitivity test) and pour into sensitivity test requirements such as CS114, CS115, CS116, RS103 that lightning protection required and GJB151B-2013 (for military use electromagnetic compatibility standard) in stipulation.
The utility model discloses a communication bus signal's anti-interference frequency range can be widened in the common mode inductor's of different inductance values combined use, uses through common mode capacitor and common mode inductor's combination, can improve communication bus signal's anti-interference amplitude, can guarantee again simultaneously that filtering protection circuit does not influence communication bus's normal transmission.
The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.
Claims (2)
1. A protection filter circuit for communication bus signals is characterized by comprising a first TVS tube, a second TVS tube, a first common mode inductor, a first capacitor, a second capacitor and a second common mode inductor; the first TVS tube and the second TVS tube are used for lightning protection and peak voltage suppression of a communication bus; the first end of the first TVS tube is connected with the first input end of the first common mode inductor; the first end of the second TVS tube is connected with the second input end of the first common mode inductor; the first input end of the first common mode inductor and the second input end of the first common mode inductor are used for communication bus signal input; the first output end of the first common-mode inductor is connected with the first end of the first capacitor and the first input end of the second common-mode inductor; the second output end of the first common-mode inductor is connected with the second end of the second capacitor and the second input end of the second common-mode inductor; the second end of the first capacitor and the first end of the second capacitor are grounded; the first output end of the second common mode inductor and the second output end of the second common mode inductor are used for communication bus signal output.
2. The circuit of claim 1, wherein the first common mode inductor and the second common mode inductor have different inductances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022760957.XU CN214014205U (en) | 2020-11-25 | 2020-11-25 | Protection filter circuit of communication bus signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022760957.XU CN214014205U (en) | 2020-11-25 | 2020-11-25 | Protection filter circuit of communication bus signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214014205U true CN214014205U (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022760957.XU Active CN214014205U (en) | 2020-11-25 | 2020-11-25 | Protection filter circuit of communication bus signal |
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| CN (1) | CN214014205U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115866436A (en) * | 2023-02-24 | 2023-03-28 | 荣耀终端有限公司 | Communication circuit and related device |
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2020
- 2020-11-25 CN CN202022760957.XU patent/CN214014205U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115866436A (en) * | 2023-02-24 | 2023-03-28 | 荣耀终端有限公司 | Communication circuit and related device |
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