CN215773083U - Communication isolation circuit and communication isolator - Google Patents
Communication isolation circuit and communication isolator Download PDFInfo
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- CN215773083U CN215773083U CN202120925761.3U CN202120925761U CN215773083U CN 215773083 U CN215773083 U CN 215773083U CN 202120925761 U CN202120925761 U CN 202120925761U CN 215773083 U CN215773083 U CN 215773083U
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Abstract
The utility model discloses a communication isolation circuit and a communication isolator, wherein the communication isolation circuit comprises: the first coupling capacitor, the second coupling capacitor, the third coupling capacitor and the fourth coupling capacitor; the first coupling capacitor, the second coupling capacitor are used for coupling transmission of a sending signal, and the third coupling capacitor and the fourth coupling capacitor are used for coupling transmission of a receiving signal. The communication isolation circuit provided by the utility model takes the capacitor as a coupling device during signal transmission, can provide a high-frequency signal path for communication for two sets of systems based on the communication isolation circuit, realizes isolation on the systems at the same time, and reduces the cost of the communication isolation circuit while ensuring normal communication of the systems.
Description
Technical Field
The embodiment of the utility model relates to a communication technology, in particular to a communication isolation circuit and a communication isolator.
Background
Network transformers, which may also be referred to as network isolation transformers, are primarily used in systems containing network switches, routers, network cards, or hubs. Network isolation transformers are typically configured on the network interface for data transmission. The network isolation transformer can isolate different levels among different network devices to prevent different voltages from damaging the devices through network cable transmission. The functions of signal coupling, high-voltage isolation, impedance matching, electromagnetic interference suppression and the like are achieved.
In the prior art, a network isolation transformer filters differential signals sent out from a physical layer by using differential mode coupling coil coupling to enhance the signals, and the signals are coupled to next-stage equipment with different levels through conversion of electromagnetic fields. The existing network isolation transformer has high cost and long material exchange period of the differential mode coupling coil.
SUMMERY OF THE UTILITY MODEL
The utility model provides a communication isolation circuit and a communication isolator, which aim to reduce the cost of the communication isolator.
In a first aspect, an embodiment of the present invention provides a communication isolation circuit, including: the first coupling capacitor, the second coupling capacitor, the third coupling capacitor and the fourth coupling capacitor;
the first coupling capacitor and the second coupling capacitor are used for coupling transmission of a sending signal, and the third coupling capacitor and the fourth coupling capacitor are used for coupling transmission of a receiving signal.
Further, the circuit also comprises a first buffer, a first inverter and a first trigger;
the output end of the first buffer is connected with the first end of the first coupling capacitor; the output end of the first inverter is connected with the first end of the second coupling capacitor, and the second ends of the first coupling capacitor and the second coupling capacitor are connected with the first trigger.
Further, the circuit also comprises a second buffer, a second inverter and a second trigger;
the output end of the second buffer is connected with the first end of the third coupling capacitor; the output end of the second inverter is connected with the first end of the fourth coupling capacitor, and the second ends of the third coupling capacitor and the fourth coupling capacitor are connected with the second trigger.
In a second aspect, an embodiment of the present invention further provides a communication isolator, including: the differential signal data receiving system comprises a differential signal data sending positive end, a differential signal data starting negative end, a differential signal sending positive end, a differential signal sending negative end, a differential signal data receiving positive end, a differential signal data receiving negative end, a differential signal receiving positive end and a differential signal receiving negative end;
the differential signal data transmitting positive end is connected with the differential signal transmitting positive end through a first coupling capacitor;
the differential signal data sending negative terminal is connected with the differential signal sending negative terminal through a second coupling capacitor;
the differential signal data receiving positive end is connected with the differential signal receiving positive end through a third coupling capacitor;
the differential signal data receiving negative terminal is connected with the differential signal receiving negative terminal through a fourth coupling capacitor.
Furthermore, the device also comprises a first tap end and a second tap end; the first tap end and the second tap end are suspended.
Furthermore, the device also comprises a third tap end and a fourth tap end; the second tap end is grounded through a first capacitor, and the fourth tap end is grounded through a second capacitor.
Compared with the prior art, the utility model has the beneficial effects that: the communication isolation circuit provided by the utility model takes the capacitor as a coupling device during signal transmission, can provide a high-frequency signal path for communication for two sets of systems based on the communication isolation circuit, realizes isolation on the systems at the same time, and reduces the cost of the communication isolation circuit while ensuring normal communication of the systems.
Drawings
FIG. 1 is a schematic diagram of a communication isolation circuit in an embodiment;
FIG. 2 is a schematic diagram of another communication isolation circuit configuration in an embodiment;
FIG. 3 is a schematic diagram of a communication isolator in an embodiment;
FIG. 4 is a schematic diagram of another communication isolator in an embodiment;
fig. 5 is a schematic diagram of a communication isolation transformer in the prior art.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a communication isolation circuit in an embodiment, and referring to fig. 1, the communication isolation circuit includes: a first coupling capacitor C1, a second coupling capacitor C2, a third coupling capacitor C3 and a fourth coupling capacitor C4.
The first coupling capacitor C1, the second coupling capacitor C2 are used for transmitting signal coupling transmission, and the third coupling capacitor C3, the fourth coupling capacitor C4 are used for receiving signal coupling transmission.
In the signal transmission process, if the communication signal level is at a high potential, the voltage at one end of the coupling capacitor gradually increases, charges are gradually accumulated on a polar plate where the end is located, and when the terminal voltage decreases, the charge accumulated by the coupling capacitor returns to the circuit.
For example, in the present embodiment, the communication isolation circuit may be used for transmitting a single-ended signal or a differential signal.
If the communication isolation circuit is used for transmitting single-ended signals, branches including the first coupling capacitor C1 and the second coupling capacitor C2 can be used as a TX signal transmission path respectively; the branches including the third coupling capacitor C3 and the fourth coupling capacitor C4 may be used as an RX signal transmission path, respectively.
If the communication isolation circuit is used for transmitting differential signals, branches including the first coupling capacitor C1 and the second coupling capacitor C2 can be used as a TX + signal transmission path and a TX-signal transmission path, respectively; the branches including the third coupling capacitor C3 and the fourth coupling capacitor C4 can be used as an RX + signal transmission path and an RX-signal transmission path, respectively.
In this embodiment, the capacitor is used as a coupling device during signal transmission, and based on the communication isolation circuit, a high-frequency signal path for communication can be provided for two sets of systems, and isolation on the systems is realized at the same time, so that the cost of the communication isolation circuit is reduced while normal communication of the systems is ensured.
Fig. 2 is a schematic structural diagram of another communication isolation circuit in the embodiment, and referring to fig. 2, the communication isolation circuit may include a first coupling capacitor C1, a second coupling capacitor C2, a third coupling capacitor C3, and a fourth coupling capacitor C4.
The circuit also comprises a first buffer 101, a first inverter 102 and a first trigger U1, wherein the output end of the first buffer 101 is connected with the first end of a first coupling capacitor C1; an output terminal of the first inverter 102 is connected to a first terminal of a second coupling capacitor C2, and second terminals of the first coupling capacitor C1 and the second coupling capacitor C2 are connected to a first flip-flop U1.
Illustratively, the first flip-flop U1 is an RS flip-flop.
Illustratively, the transmission data TD forms a differential signal TD +, TD-after passing through the first buffer 101 and the first inverter 102, TD + in the differential signal is coupled to the S terminal of the first flip-flop U1 through the first coupling capacitor C1, TD-in the differential signal is coupled to the R terminal of the first flip-flop U1 through the second coupling capacitor C2, and the differential signal TD +, TD-after passing through the first flip-flop U1 forms the transmission signal TX.
As an implementation example, the communication isolation circuit shown in fig. 2 may further include a second buffer 201, a second inverter 202, and a second flip-flop U2.
The output end of the second buffer 201 is connected with the first end of the third coupling capacitor C3; an output terminal of the second inverter 202 is connected to a first terminal of a fourth coupling capacitor C4, and second terminals of the third coupling capacitor C3 and the fourth coupling capacitor C4 are connected to a second flip-flop U2.
Illustratively, the second flip-flop U2 is an RS flip-flop.
Illustratively, the received data RD passes through the second buffer 201 and the second inverter 202 to form a differential signal RD +, RD + in the differential signal is coupled to the S terminal of the second flip-flop U2 through the third coupling capacitor C3, RD-in the differential signal is coupled to the R terminal of the second flip-flop U2 through the fourth coupling capacitor C4, and the differential signal RD +, RD-passes through the second flip-flop U2 to form a received signal RX.
Example two
Fig. 3 is a schematic structural diagram of a communication isolator in an embodiment, and referring to fig. 1 and 3, the embodiment provides a communication isolator including a positive differential signal data transmitting terminal TD +, a negative differential signal data transmitting terminal TD-, a positive differential signal transmitting terminal TX +, a negative differential signal transmitting terminal TX +, a positive differential signal data receiving terminal RD +, a negative differential signal data receiving terminal RD-, a positive differential signal receiving terminal RX +, and a negative differential signal receiving terminal RX-.
The differential signal data transmitting positive terminal TD + is connected with the differential signal transmitting positive terminal TX + through a first coupling capacitor C1; the differential signal data sending negative terminal TD-is connected with the differential signal sending negative terminal TX-through a second coupling capacitor C2; the differential signal data receiving positive terminal RD + is connected with the differential signal receiving positive terminal RX + through a third coupling capacitor C3; the differential signal data receiving negative terminal RD-is connected to the differential signal receiving negative terminal RX-through a fourth coupling capacitor C4.
Illustratively, in the present embodiment, the communication isolator is used for differential signal transmission, and the communication isolator shown in fig. 3 directly receives differential data and directly outputs differential signals.
Fig. 5 is a schematic diagram of a communication isolation transformer in the prior art, and referring to fig. 5, in the prior art, a transmitting data terminal TD +, TD-is connected to a transmitting signal terminal TX +, TX-through a network transformer and a common mode inductor; the reception data terminal RD +, RD-is connected to the reception signal terminal RX +, RX-through a network transformer and a common mode inductor. The network transformer is used for coupling signal voltage between the data end and the signal end, and the common-mode inductor is used for eliminating common-mode electromagnetic interference in the coupling communication process.
Compared with the scheme shown in fig. 5, the communication isolator provided by the embodiment uses the capacitor as a coupling device during differential signal transmission, and based on the communication isolator, the cost of the communication isolator can be reduced while normal communication of a system is ensured.
Fig. 4 is a schematic diagram of another communication isolator in an embodiment, and referring to fig. 4, as an implementation possibility, the communication isolator may further include a first tap port TCT and a second tap port MCT, and the first tap port TCT and the second tap port MCT are floating.
Illustratively, the communication isolator may include a communication isolation transformer and a PCB, the communication isolation transformer being soldered to the PCB to form the communication isolator.
For example, if the communication isolation transformer adopts TNK-BD12a28, the PCB is correspondingly provided with TD +, TD-, TX +, TX-, RD +, RD-, RX +, RX-, TCT, and MCT pin pads (where the TCT and MCT pin pads correspond to the tap end of the network transformer in the communication isolation transformer).
For example, a PCB configured with TD +, TD-, TX +, TX-, RD +, RD-, RX +, RX-, TCT, and MCT pin pads may be trimmed to form a PCB board of a communication isolator corresponding to this embodiment, and at the same time, four coupling capacitors are used to replace a communication isolation transformer to form a communication isolator corresponding to this embodiment, where the TCT and the MCT that are originally configured may be set in a floating manner.
Referring to fig. 4, the communication isolator may further include a first tap port TCT, a second tap port MCT, a third tap port RCT, and a fourth tap port MCR, the second tap port MCT being grounded through a first capacitor C6, and the fourth tap port MCR being grounded through a second capacitor C5.
For example, if a communication isolation transformer of a certain model includes four network transformer tap ends, the communication isolator may retain the first tap end TCT, the second tap end MCT, the third tap end RCT, and the fourth tap end MCR if the communication isolator corresponding to this embodiment is formed by adjusting the PCB and using four coupling capacitors instead of the communication isolation transformer. The first tap end TCT and the third tap end RCT are tap ends of network transformer coils on the data side of the communication isolation transformer, and the second tap end MCT and the fourth tap end MCR are tap ends of network transformer coils on the signal side of the communication isolation transformer.
Illustratively, the stability of the communication isolator can be improved by grounding the floating second tap end MCT and the floating fourth tap end MCR through a capacitor.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A communication isolation circuit, comprising: the first coupling capacitor, the second coupling capacitor, the third coupling capacitor and the fourth coupling capacitor;
the first coupling capacitor and the second coupling capacitor are used for coupling transmission of a sending signal, and the third coupling capacitor and the fourth coupling capacitor are used for coupling transmission of a receiving signal;
two ends of the first coupling capacitor are respectively used for being connected with a differential signal data transmitting positive end and a differential signal transmitting positive end;
two ends of the second coupling capacitor are respectively used for being connected with a differential signal data sending negative end and a differential signal sending negative end;
two ends of the third coupling capacitor are respectively used for being connected with a differential signal data receiving positive end and a differential signal receiving positive end;
and two ends of the fourth coupling capacitor are respectively used for being connected with the differential signal data receiving negative terminal and the differential signal receiving negative terminal.
2. The communication isolation circuit of claim 1, further comprising a first buffer, a first inverter, a first flip-flop;
the output end of the first buffer is connected with the first end of the first coupling capacitor; the output end of the first inverter is connected with the first end of the second coupling capacitor, and the second ends of the first coupling capacitor and the second coupling capacitor are connected with the first trigger.
3. The communication isolation circuit of claim 1, further comprising a second buffer, a second inverter, a second flip-flop;
the output end of the second buffer is connected with the first end of the third coupling capacitor; the output end of the second inverter is connected with the first end of the fourth coupling capacitor, and the second ends of the third coupling capacitor and the fourth coupling capacitor are connected with the second trigger.
4. A communication isolator comprising the communication isolation circuit of claim 1, the communication isolator being configured with a positive differential signal data transmitting terminal, a negative differential signal data transmitting terminal, a positive differential signal transmitting terminal, a negative differential signal transmitting terminal, a positive differential signal data receiving terminal, a negative differential signal data receiving terminal, a positive differential signal receiving terminal, and a negative differential signal receiving terminal;
the differential signal data transmitting positive end is connected with the differential signal transmitting positive end through a first coupling capacitor;
the differential signal data sending negative terminal is connected with the differential signal sending negative terminal through a second coupling capacitor;
the differential signal data receiving positive end is connected with the differential signal receiving positive end through a third coupling capacitor;
the differential signal data receiving negative terminal is connected with the differential signal receiving negative terminal through a fourth coupling capacitor.
5. The communication isolator of claim 4, further comprising a first tap end, a second tap end;
the first tap end and the second tap end are suspended.
6. The communication isolator of claim 5, further comprising a third tap end, a fourth tap end;
the second tap end is grounded through a first capacitor, and the fourth tap end is grounded through a second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120925761.3U CN215773083U (en) | 2021-04-29 | 2021-04-29 | Communication isolation circuit and communication isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120925761.3U CN215773083U (en) | 2021-04-29 | 2021-04-29 | Communication isolation circuit and communication isolator |
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| Publication Number | Publication Date |
|---|---|
| CN215773083U true CN215773083U (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120925761.3U Active CN215773083U (en) | 2021-04-29 | 2021-04-29 | Communication isolation circuit and communication isolator |
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| CN (1) | CN215773083U (en) |
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2021
- 2021-04-29 CN CN202120925761.3U patent/CN215773083U/en active Active
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