CN218897210U - Low-frequency filter circuit of photoelectric signal - Google Patents
Low-frequency filter circuit of photoelectric signal Download PDFInfo
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- CN218897210U CN218897210U CN202320417206.9U CN202320417206U CN218897210U CN 218897210 U CN218897210 U CN 218897210U CN 202320417206 U CN202320417206 U CN 202320417206U CN 218897210 U CN218897210 U CN 218897210U
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Abstract
The utility model provides a low-frequency filter circuit of an optoelectronic signal, which relates to the technical field of electronic circuits and comprises a power line filter circuit and a signal line filter circuit; the power line filter circuit comprises a grounding line and a power line multistage filter circuit; the power line multistage filter circuit is distributed with a protection circuit, a primary power line filter circuit, a secondary power line filter circuit and a differential mode inductance filter circuit which are connected in sequence; the signal line filter circuit comprises a signal input end and a signal output end, and further comprises a first patch capacitor-resistor assembly, a second patch capacitor-resistor assembly, a first transient diode, a signal line common mode inductance and a second transient diode which are connected in parallel. The utility model comprises two filtering modes of a power line and a signal line, and can be suitable for various external cables and can be exchanged and reused at will by selecting filtering circuits in different intervals and exchanging filtering devices with different parameters.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a low-frequency filter circuit of a photoelectric signal.
Background
When an electromagnetic compatibility test is carried out on an electrical product, the problems of emission and interference resistance caused by an external connection cable often occur, and the current industry is to cover the cable with a metal shielding layer, so that the method is high in cost, high in process requirement and high in shielding reject ratio, and the problem of product functionality caused when a wire core is directly interfered cannot be completely solved.
In this case, a filter circuit is generally considered, for example, chinese patent publication No. CN205844497U discloses a synchronous anti-interference filter circuit for sampling voltage of a battery cell, which includes a multi-stage filter circuit, wherein input ends of the multi-stage filter circuit are respectively connected with output ends of the battery cell module, and output ends of the multi-stage filter circuit are connected with sampling ends of a sampling chip; the voltage signal at the output end of the battery cell module is transmitted to a multistage filtering circuit, the multistage filtering circuit filters and attenuates the interference signal of the voltage signal, then the voltage signal is transmitted to the sampling end of the sampling chip, and the sampling chip performs voltage sampling. According to the technical scheme, the interference signals of the voltage signals at the output end of the battery cell module can be filtered and attenuated, and the reliability and stability of battery cell voltage sampling are improved.
However, due to the fact that the circuit design is molded or the wiring layout space is limited, the filter circuit cannot be tried to be added, or the dependable grounding cannot be provided for the filter circuit, the independent external filter circuit board is designed according to the problems, and multiple circuits can be connected to carry out filter debugging.
Disclosure of Invention
Based on the above problems, an object of the present utility model is to provide a low frequency filter circuit for an optoelectronic signal.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a low frequency filter circuit of an optoelectronic signal, the low frequency filter circuit comprising a power line filter circuit and a signal line filter circuit;
the power line filter circuit comprises a grounding line and a power line multistage filter circuit;
the power line multistage filter circuit is distributed with a protection circuit, a primary power line filter circuit, a secondary power line filter circuit and a differential mode inductance filter circuit which are connected in sequence;
the protection circuit is provided with first power line welding point groups A1 and A2, second power line welding point groups B1 and B2 and third power line welding point groups C1 and C2 are arranged in the primary power line filter circuit, the secondary power line filter circuit is provided with fourth power line welding point groups D1 and D2, and the differential mode inductance filter circuit is provided with fifth power line welding point groups E1 and E2;
the signal line filter circuit comprises a signal input end, a signal output end, a first patch capacitor-resistor assembly, a second patch capacitor-resistor assembly, a first transient diode, a signal line common mode inductor and a second transient diode which are connected in parallel.
Preferably, the protection circuit comprises a first response component, a second response component and a third response component which are mutually connected in parallel, and each group of response components comprises a piezoresistor and a gas discharge tube which are mutually connected in series;
the primary power line filter circuit comprises a first capacitor C1 and a second capacitor C2 which are connected in parallel, and also comprises a third capacitor C3 and a first common-mode inductor L1 connected in parallel with the output end of the third capacitor C3;
the secondary power line filter circuit comprises a fourth capacitor C4 and a second common-mode inductor L2 connected in parallel with the output end of the fourth capacitor C4; the differential-mode inductance filter circuit comprises a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7 which are connected in parallel with the output end of the fifth capacitor C5, wherein a first differential-mode inductance L3 is connected between the fifth capacitor C5 and the sixth capacitor C6, and a second differential-mode inductance L4 is connected between the fifth capacitor C5 and the seventh capacitor C7;
the signal line filter circuit comprises a signal input end, a signal output end, a first patch capacitor-resistor assembly, a second patch capacitor-resistor assembly, a first transient diode, a signal line common mode inductor and a second transient diode which are connected in parallel.
Preferably, the protection circuit is provided with first power line welding point groups A1 and A2, in the primary power line filter circuit, second power line welding point groups B1 and B2 are arranged at two ends of the first capacitor C1 and the second capacitor C2, third power line welding point groups C1 and C2 are arranged at two ends of the third capacitor C3, the secondary power line filter circuit is provided with fourth power line welding point groups D1 and D2, and the differential mode inductance filter circuit is provided with fifth power line welding point groups E1 and E2.
Preferably, the first response component comprises a first gas discharge tube TV1 and a second piezoresistor R2 connected in series; the second response component comprises a third gas discharge tube TV3 and a first piezoresistor R1 which are connected in series; the third response component comprises a second gas discharge tube TV2 and a third piezoresistor R3 which are connected in series; the first gas discharge tube TV1 and the third gas discharge tube TV3 are both connected to the ground line.
Preferably, the first capacitor C1, the second capacitor C2, the sixth capacitor C6 and the seventh capacitor C7 are all common-mode capacitors, and the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are all differential-mode capacitors.
Preferably, the first capacitor C1 and the sixth capacitor C6 are both connected to the ground line.
Preferably, the first chip capacitor-resistor assembly comprises a first chip capacitor and a first chip resistor connected in series; the second chip capacitor-resistor assembly comprises a second chip capacitor and a second chip resistor which are connected in series.
Compared with the prior art, the utility model has the following advantages:
according to the utility model, by arranging the power line filter circuit and the signal line filter circuit, a plurality of proper welding points are reserved for filter devices with different sizes and types, and by selecting filter circuits with different intervals and exchanging filter devices with different parameters, the filter device can be suitable for various external cables, and can be exchanged and reused at will; meanwhile, the filter plate is provided with an independent grounding wire, so that the grounding isolation is realized, convenience is provided for the subsequent attempt of connecting different grounds, and a proper grounding point can be found for the filter plate more quickly.
Drawings
FIG. 1 is a schematic diagram of a power line filter circuit in a low frequency filter circuit for an optoelectronic signal;
FIG. 2 is a schematic diagram of the structure of a signal line filter circuit in a low frequency filter circuit for an optoelectronic signal;
fig. 3 is a schematic diagram of a low-frequency filtering circuit for photoelectric signals, which is a group of signal line filtering circuits for dealing with multiple groups of differential pair signals.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present utility model more clear, the technical solution of the present utility model will be clearly and completely described below in connection with the embodiments of the present utility model.
In the description of the present application, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the present application.
As shown in fig. 1 to 3, a low-frequency filter circuit of an optoelectronic signal, the low-frequency filter circuit includes a power line filter circuit and a signal line filter circuit;
the power line filter circuit comprises a grounding line and a power line multistage filter circuit;
the power line multistage filter circuit is distributed with a protection circuit, a primary power line filter circuit, a secondary power line filter circuit and a differential mode inductance filter circuit which are connected in sequence; the protection circuit comprises a first response component, a second response component and a third response component which are mutually connected in parallel, and each group of response components comprises a piezoresistor and a gas discharge tube which are mutually connected in series; the first response component comprises a first gas discharge tube TV1 and a second piezoresistor R2 which are connected in series; the second response component comprises a third gas discharge tube TV3 and a first piezoresistor R1 which are connected in series; the third response component comprises a second gas discharge tube TV2 and a third piezoresistor R3 which are connected in series; the first gas discharge tube TV1 and the third gas discharge tube TV3 are both connected to the ground line.
The primary power line filter circuit comprises a first capacitor C1 and a second capacitor C2 which are connected in parallel, and also comprises a third capacitor C3 and a first common-mode inductor L1 connected in parallel with the output end of the third capacitor C3; the secondary power line filter circuit comprises a fourth capacitor C4 and a second common-mode inductor L2 connected in parallel with the output end of the fourth capacitor C4; the differential-mode inductance filter circuit comprises a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7 which are connected in parallel with the output end of the fifth capacitor C5, a first differential-mode inductance L3 is connected between the fifth capacitor C5 and the sixth capacitor C6, and a second differential-mode inductance L4 is connected between the fifth capacitor C5 and the seventh capacitor C7. The first capacitor C1, the second capacitor C2, the sixth capacitor C6 and the seventh capacitor C7 are all common-mode capacitors, and the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are all differential-mode capacitors. The first capacitor C1 and the sixth capacitor C6 are both connected to the ground line.
The protection circuit is provided with first power line welding point groups A1 and A2, in the primary power line filter circuit, second power line welding point groups B1 and B2 are arranged at two ends of a first capacitor C1 and a second capacitor C2, third power line welding point groups C1 and C2 are arranged at two ends of a third capacitor C3, fourth power line welding point groups D1 and D2 are arranged on the secondary power line filter circuit, and fifth power line welding point groups E1 and E2 are arranged on the differential mode inductance filter circuit.
The signal line filter circuit comprises a signal input end and a signal output end, and further comprises a first patch capacitor-resistor assembly, a second patch capacitor-resistor assembly, a first transient diode TVS1, a signal line common mode inductance L5 and a second transient diode TVS2 which are connected in parallel; the first chip capacitor-resistor assembly comprises a first chip capacitor C8 and a first chip resistor R4 which are connected in series, the second chip capacitor-resistor assembly comprises a second chip capacitor C9 and a second chip resistor R5 which are connected in series, and the first chip resistor R4 and the second chip resistor R5 can be replaced by magnetic beads.
The first patch capacitor-resistor assembly comprises a first patch capacitor and a first patch resistor which are connected in series; the second chip capacitor-resistor assembly comprises a second chip capacitor and a second chip resistor which are connected in series.
The utility model provides a method for adjusting a low-frequency filter circuit of an optoelectronic signal, which comprises the following steps:
when the power line filter circuit is connected in:
the single low-frequency filter circuit integrally comprises a protection circuit, a common mode filter circuit and a differential mode filter circuit.
When the filter is used, different nodes are selected to serve as the input and output of a power supply, so that protection and various filtering modes can be realized. The method specifically comprises the following modes:
(1) A1/A2 is selected as an input point, D1/D2 is taken as an output point, all components between A1/A2-D1/D2 are installed according to a wiring mode of a circuit diagram, the functions of front-end protection circuits and rear-end common mode filtering can be realized, piezoresistors R1/R2/R3 and gas discharge tubes TV1/TV2/TV3 can be added into the whole circuit to cope with the problems of electromagnetic compatibility emission and noise immunity of products, the leading-in of a front-stage protection circuit is realized, and a first-stage filter circuit containing a common mode and a differential mode is simultaneously led in;
(2) if B1/B2 is selected as an input point, D1/D2 is selected as an output point, and compared with the mode (1), the mode (1) is characterized in that a protection circuit is not used, and a first-stage filter circuit comprising a common mode and a differential mode is introduced;
(3) A1/A2 is selected as an input point, E1/E2 is selected as an output point, and a protection circuit is introduced, and two stages of filter circuits containing a common mode and a differential mode are introduced at the same time, so that common mode noise and differential mode noise can be further suppressed;
(4) B1/B2 is selected as an input point, E1/E2 is selected as an output point, and a protection circuit is not used, so that two stages of filter circuits containing common mode and differential mode can be introduced, and common mode and differential mode noises can be further suppressed;
(5) A1/A2 is selected as an input point, F1/F2 is selected as an output point, and L3/L4 differential mode inductance can be introduced on the basis of the mode (3), so that the suppression of differential mode noise can be enhanced;
(6) B1/B2 is selected as an input point, F1/F2 is selected as an output point, and L3/L4 differential mode inductance can be introduced on the basis of the mode (3), so that the suppression of differential mode noise can be enhanced;
therefore, different nodes are selected as input and output access points, and a single filter device or a filter circuit formed by a plurality of filter devices can be selected, so that the filter circuit with different filtering capabilities is selected.
When the signal line filter circuit is accessed, different functions can be realized by accessing different nodes, and the method specifically comprises the following steps:
also has the function of realizing different filtering or filtering capability by connecting different access points.
(1) G1/G2 is selected as an input point, H1/H2 is selected as an output point, all pieces between G1/G2-H1/H2 are fed according to a wiring mode of a circuit diagram, and a pi-type low-pass filter circuit can be realized; if the left capacitor C1 is not added, the right capacitor C2 is added, so that a simpler RC type low-pass filter circuit can be realized; wherein the former has better insertion loss characteristics;
(2) G1/G2 is selected as an input point, K1/K2 is selected as an output point, and the common mode inductance L can be introduced on the basis of (1), so that the suppression of common mode noise can be enhanced;
the signal line filter circuit may also be optimized and arranged to combine circuits that handle multiple sets of differential pair signals, where each set of filter circuits is approximately identical in structure, as shown in fig. 3.
The specific working principle of each group is as follows: the front-end resistor is used for adjusting the matching impedance of the differential signal TX/RX at the input end and the output end, so that the noise reflection is reduced, and meanwhile, the differential signal TX/RX has a certain partial pressure filtering effect; the middle common mode inductance is used for suppressing common mode noise formed by differential signals TX/RX and ground respectively, which is also a main noise form of differential signal pairs in a circuit, and has a certain differential mode filtering effect; the final TVS (transient suppression diode) is a protective device, has nanosecond response speed, can well clamp noise voltage in a safe range, and does not impact a later-stage circuit.
The power line filter circuit and the signal line filter circuit both use the principle of a low-pass filter, but the filtering of the power supply and the signal has larger difference in the type and application range of the device, the two circuit modules are integrated on the same filter circuit board together, and the two circuit modules can be selected and replaced according to actual conditions and connected into various circuits for filtering and debugging.
The foregoing is a description of embodiments of the utility model, which are specific and detailed, but are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements, such as changing the moving structure, etc., may be made by those skilled in the art without departing from the spirit of the present utility model, and these obvious alternatives are intended to be within the scope of the present utility model.
Claims (6)
1. A low frequency filter circuit for an optical-electrical signal, characterized by:
the low-frequency filter circuit comprises a power line filter circuit and a signal line filter circuit which are integrated on the same circuit board;
the power line filter circuit comprises a grounding line and a power line multistage filter circuit;
the power line multistage filter circuit is distributed with a protection circuit, a primary power line filter circuit, a secondary power line filter circuit and a differential mode inductance filter circuit which are connected in sequence;
the protection circuit is provided with a first power line welding point set, a second power line welding point set and a third power line welding point set are arranged in the primary power line filter circuit, the secondary power line filter circuit is provided with a fourth power line welding point set, and the differential mode inductance filter circuit is provided with a fifth power line welding point set;
the signal line filter circuit comprises a signal input end, a signal output end, a first patch capacitor-resistor assembly, a second patch capacitor-resistor assembly, a first transient diode, a signal line common mode inductor and a second transient diode which are connected in parallel.
2. The low frequency filtering circuit of an optical-electrical signal according to claim 1, wherein: the protection circuit comprises a first response component, a second response component and a third response component which are mutually connected in parallel, and each group of response components comprises a piezoresistor and a gas discharge tube which are mutually connected in series;
the primary power line filter circuit comprises a first capacitor, a second capacitor, a third capacitor and a first common-mode inductor, wherein the first capacitor and the second capacitor are connected in parallel, and the third capacitor and the first common-mode inductor are connected in parallel with the output end of the third capacitor;
the second-stage power line filter circuit comprises a fourth capacitor and a second common-mode inductor connected with the output end of the fourth capacitor in parallel; the differential-mode inductance filter circuit comprises a fifth capacitor, a sixth capacitor and a seventh capacitor which are connected in parallel with the output end of the fifth capacitor, wherein a first differential-mode inductance is connected between the fifth capacitor and the sixth capacitor, and a second differential-mode inductance is connected between the fifth capacitor and the seventh capacitor.
3. A low frequency filtering circuit for an optical-electrical signal as claimed in claim 2, wherein: the first response component comprises a first gas discharge tube and a second piezoresistor which are connected in series; the second response component comprises a third gas discharge tube and a first piezoresistor which are connected in series; the third response component comprises a second gas discharge tube and a third piezoresistor which are connected in series; the first gas discharge tube and the third gas discharge tube are both connected with the grounding circuit.
4. A low frequency filtering circuit for an optical-electrical signal as claimed in claim 2, wherein: the first capacitor, the second capacitor, the sixth capacitor and the seventh capacitor are all common-mode capacitors, and the third capacitor, the fourth capacitor and the fifth capacitor are all differential-mode capacitors.
5. A low frequency filtering circuit for an optical-electrical signal as claimed in claim 2, wherein: the first capacitor and the sixth capacitor are both connected with the grounding line.
6. The low frequency filtering circuit of an optical-electrical signal according to claim 1, wherein: the first patch capacitor-resistor assembly comprises a first patch capacitor and a first patch resistor which are connected in series; the second chip capacitor-resistor assembly comprises a second chip capacitor and a second chip resistor which are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320417206.9U CN218897210U (en) | 2023-03-08 | 2023-03-08 | Low-frequency filter circuit of photoelectric signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320417206.9U CN218897210U (en) | 2023-03-08 | 2023-03-08 | Low-frequency filter circuit of photoelectric signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218897210U true CN218897210U (en) | 2023-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320417206.9U Active CN218897210U (en) | 2023-03-08 | 2023-03-08 | Low-frequency filter circuit of photoelectric signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218897210U (en) |
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- 2023-03-08 CN CN202320417206.9U patent/CN218897210U/en active Active
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