Isolator for suppressing common-mode transient interference, and communication device

Abstract

The present application discloses an isolator for suppressing common-mode transient interference and a communication device. The isolator for suppressing common-mode transient interference comprises a sending end and a receiving end. The sending end and the receiving end are connected by means of an isolation circuit. The receiving end comprises a matching network, and a center tap of the matching network is connected to a common-mode transient interference suppression circuit. The common-mode transient interference suppression circuit is added to the center tap of the matching network of the receiving end of the isolator, so that on one hand, common-mode transient interference can be suppressed; on the other hand, the addition of the common-mode transient interference suppression circuit does not attenuate the communication signal received by the receiving end and thus avoids impact on signal transmission. Therefore, the normal transmission of communication signals can be well ensured while suppressing common-mode transient interference.

Description

Isolator and communication device for suppressing common-mode transient interference Technical Field

[0001] The present application relates to the field of common-mode transient interference suppression, and in particular to an isolator and a communication device for suppressing common-mode transient interference. Background Art

[0002] Common-mode transient interference (CMTI) refers to a rapidly changing common-mode voltage difference between the two ends of an isolator circuit. This can damage the circuit, causing output errors or failure. Therefore, it is crucial to effectively suppress common-mode transient interference in circuits.

[0003] Existing common-mode transient interference suppression circuits in high-speed digital isolators require additional resistors or capacitors connected to the signal transmission path. This method results in a small signal received at the input (RX) end, necessitating an increase in the RF output power (delivered power) at the output (TX) end, which in turn increases DC power consumption. Summary of the Invention

[0004] The technical problem to be solved by the present application is to provide an isolator and a communication device for suppressing common-mode transient interference, thereby ensuring normal transmission of communication signals while suppressing common-mode transient interference.

[0005] In order to solve the above technical problems, a technical solution adopted in this application is:

[0006] An isolator for suppressing common-mode transient interference includes a transmitting end and a receiving end;

[0007] The transmitting end and the receiving end are connected via an isolation circuit;

[0008] The receiving end includes a matching network, and a middle tap of the matching network is connected to a common-mode transient interference suppression circuit.

[0009] Furthermore, the isolation circuit is a magnetic coupling circuit.

[0010] Furthermore, the isolation circuit is an antenna transceiver.

[0011] Furthermore, the antenna transceiver includes a transmitting antenna and a receiving antenna;

[0012] One end of the transmitting antenna is connected to the transmitting end, and the other end thereof is connected to one end of the receiving antenna for wireless communication via millimeter waves;

[0013] The other end of the receiving antenna is connected to the receiving end.

[0014] Furthermore, the transmitting antenna and the receiving antenna are differential antennas.

[0015] Furthermore, the matching network is a transformer;

[0016] The common-mode transient interference suppression circuit is connected to a center tap of the secondary winding of the transformer.

[0017] Furthermore, the common-mode transient interference suppression circuit includes a capacitor;

[0018] One end of the capacitor is connected to the middle tap of the matching network, and the other end is grounded.

[0019] Furthermore, the matching network includes a magnetic inductor and a leakage inductor;

[0020] The magnetic inductance, leakage inductance and capacitor form a high-pass filter or a band-pass filter.

[0021] Furthermore, the isolator is a digital isolator.

[0022] In order to solve the above technical problems, another technical solution adopted in this application is:

[0023] A communication device comprises the above-mentioned isolator for suppressing common-mode transient interference.

[0024] The beneficial effect of the present application is that, by adding a common-mode transient interference suppression circuit to the middle tap of the matching network at the receiving end of the isolator, on the one hand, common-mode transient interference can be suppressed; on the other hand, since the common mode is a virtual ground for the differential, the addition of the common-mode transient interference suppression circuit will not cause the communication signal received by the receiving end to become smaller, thereby affecting signal transmission. Therefore, while suppressing common-mode transient interference, the normal transmission of the communication signal can be well guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of a circuit structure of a first implementation of an isolator for suppressing common-mode transient interference according to an embodiment of the present application;

[0026] FIG2 is a schematic diagram of a circuit structure of a second implementation of an isolator for suppressing common-mode transient interference according to an embodiment of the present application;

[0027] FIG3 is a circuit diagram of differential mode and common mode of a transformer in an isolator for suppressing common mode transient interference according to an embodiment of the present application;

[0028] FIG4 is a schematic diagram of a circuit structure of a common-mode transformer plus a common-mode transient interference suppression circuit in an isolator for suppressing common-mode transient interference according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to explain the technical content, achieved objectives and effects of this application in detail, the following is an explanation in conjunction with the implementation methods and the accompanying drawings.

[0030] The isolator for suppressing common-mode transient interference described above in this application can be applied to various isolator circuits and communication devices using isolators, and is described below through specific implementation methods:

[0031] In an optional embodiment, as shown in FIG1 and FIG2 , an isolator for suppressing common-mode transient interference is provided. The isolator may be any circuit that implements signal isolation. In an optional embodiment, the isolator may be a digital isolator.

[0032] The isolator includes a transmitting end and a receiving end;

[0033] The transmitting end and the receiving end are connected via an isolation circuit;

[0034] The receiving end includes a matching network, and a middle tap of the matching network is connected to a common-mode transient interference suppression circuit.

[0035] Among them, the isolation circuit can be implemented in various forms, as long as it can achieve the isolation effect:

[0036] In one implementation, as shown in FIG1 , the isolation circuit is a magnetic coupling circuit, that is, a matching network is provided at both the receiving end and the transmitting end, a center tap at one end of the matching network at the receiving end is connected to the common-mode transient interference suppression circuit, and the other end is connected to one end of the magnetic coupling circuit, and the other end of the magnetic coupling circuit is connected to one end of the matching network at the transmitting end;

[0037] In this implementation, isolation is achieved through a magnetic coupling circuit, which is convenient and quick.

[0038] In another implementation, as shown in FIG2 , the isolation circuit is an antenna transceiver;

[0039] In this implementation, isolation is achieved through an antenna transceiver, which can improve the isolation effect and avoid interference in a wireless manner.

[0040] Specifically, the antenna transceiver includes a transmitting antenna and a receiving antenna;

[0041] One end of the transmitting antenna is connected to the transmitting end, and the other end thereof is connected to one end of the receiving antenna for wireless communication via millimeter waves;

[0042] The other end of the receiving antenna is connected to the receiving end;

[0043] In this embodiment, wireless isolation is achieved through millimeter waves, which can further improve isolation and reduce interference, thereby ensuring communication effects.

[0044] In another optional embodiment, the transmitting antenna and the receiving antenna are differential antennas;

[0045] In this embodiment, transmission and isolation are achieved through differential antennas, which can improve signal transmission efficiency on the one hand and better suppress interference on the other hand.

[0046] Furthermore, the matching network is a transformer;

[0047] The common mode transient interference suppression circuit is connected to the center tap of the secondary winding of the transformer;

[0048] Specifically, as shown in FIG1 , in a manner where isolation is achieved by a magnetic coupling circuit, the common-mode transient interference suppression circuit is connected to a center tap of the secondary winding of the transformer, and the primary winding of the transformer is connected to one end of the magnetic coupling circuit.

[0049] As shown in FIG2 , in the manner in which the antenna transceiver is isolated, the common-mode transient interference suppression circuit is connected to the center tap of the secondary winding of the transformer, and the primary winding of the transformer is connected to one end of the receiving antenna.

[0050] The common-mode transient interference suppression circuit may be any circuit capable of suppressing common-mode transient interference;

[0051] In an optional embodiment, the common-mode transient interference suppression circuit includes a capacitor;

[0052] One end of the capacitor is connected to the middle tap of the matching network, and the other end is grounded.

[0053] As shown in Figure 3, when a transformer is used to implement the matching network, the transformer can be decomposed into two models: a differential mode model and a common mode model. Common mode transient interference is generated in the common mode model of the transformer.

[0054] Among them, L m is the magnetic inductance, L k is the leakage inductance, L m and L k The size of is determined when the transformer performs differential mode matching; when the common-mode transient interference suppression circuit includes a capacitor, as shown in FIG4 , the magnetic inductance, leakage inductance and the capacitor constitute a high-pass filter or a band-pass filter.

[0055] In another optional embodiment, a communication device includes the isolator for suppressing common-mode transient interference described in the above embodiment.

[0056] In summary, the present application provides an isolator and communication device for suppressing common-mode transient interference. By adding a common-mode transient interference suppression circuit to the middle tap of the matching network at the receiving end of the isolator, on the one hand, common-mode transient interference can be suppressed. On the other hand, since the common mode is a virtual ground for the differential, the addition of the common-mode transient interference suppression circuit will not cause the communication signal received by the receiving end to become smaller, thereby affecting signal transmission. Therefore, while suppressing common-mode transient interference, the normal transmission of the communication signal can be well guaranteed.

[0057] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent transformations made using the contents of the present application specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An isolator for suppressing common-mode transient interference, characterized in that, It includes a transmitting end and a receiving end; The transmitting end and the receiving end are connected through an isolation circuit; The receiving end includes a matching network, and the center tap of the matching network is connected to a common-mode transient interference suppression circuit.

2. An isolator for suppressing common-mode transient interference according to claim 1, characterized in that The isolation circuit is a magnetic coupling circuit.

3. An isolator for suppressing common-mode transient interference according to claim 1, characterized in that, The isolation circuit is an antenna transceiver.

4. An isolator for suppressing common-mode transient interference according to claim 3, characterized in that, The antenna transceiver includes a transmitting antenna and a receiving antenna; One end of the transmitting antenna is connected to the transmitting end, and the other end communicates wirelessly with one end of the receiving antenna through millimeter waves; The other end of the receiving antenna is connected to the receiving end.

5. An isolator for suppressing common-mode transient interference according to claim 4, characterized in that, The transmitting antenna and the receiving antenna are differential antennas.

6. An isolator for suppressing common-mode transient interference according to any one of claims 1 to 5, characterized in that, The matching network is a transformer; The common-mode transient interference suppression circuit is connected to the center tap of the secondary winding of the transformer.

7. An isolator for suppressing common-mode transient interference according to any one of claims 1 to 5, characterized in that The common-mode transient interference suppression circuit includes a capacitor; One end of the capacitor is connected to the center tap of the matching network, and the other end is grounded.

8. An isolator for suppressing common-mode transient interference according to claim 7, characterized in that, The matching network includes a magnetizing inductance and a leakage inductance; The magnetizing inductance, the leakage inductance and the capacitor form a high-pass filter or a band-pass filter.

9. An isolator for suppressing common-mode transient interference according to any one of claims 1 to 5, characterized in that, The isolator is a digital isolator.

10. A communication device, characterized in that, An isolator for suppressing common-mode transient interference, comprising the isolator according to any one of claims 1 to 9.

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