CN217282720U

CN217282720U - Capacitance separation type voltage transformation circuit

Info

Publication number: CN217282720U
Application number: CN202220952104.2U
Authority: CN
Inventors: 王淼
Original assignee: Shenzhen Xin Zhi Lian Software Co ltd
Current assignee: Shenzhen Xin Zhi Lian Software Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-08-23
Anticipated expiration: 2032-04-22

Abstract

The present disclosure relates to a capacitance-separated voltage transformation circuit. The capacitance separation type voltage transformation circuit comprises: a transmit sub-circuit and a receive sub-circuit; two capacitors and two filter inductors are arranged in the transmitting sub-circuit and the receiving sub-circuit. Compared with the traditional inductive structure circuit, the capacitive structure uses 0.1uF to replace a group of coils of the transformer, thereby reducing the cost, having better high-frequency characteristic and strengthening the lightning protection effect.

Description

Capacitance separation type voltage transformation circuit

Technical Field

The disclosure relates to the technical field of power electronic converters, in particular to a capacitance separation type transformation circuit.

Background

In order to ensure the safety of an integrated circuit chip of the network card, reduce error codes caused by external EMI (Electromagnetic Interference) and inhibit Electromagnetic noise inside a computer from transmitting energy to the air, a network transformer is added at the joint of the network card and a UTP (Unshielded Twisted Pair). The network transformer can not only isolate the chip end from the outside, enhance the anti-interference capability, increase the protection effect on the chip, such as preventing lightning stroke, but also enable the signal level to be coupled, enhance the signal and increase the transmission distance of the signal. In addition, even if the network port levels of the connections are different, the devices are not influenced with each other.

In a related scenario, referring to fig. 1, a conventional integrated inductive network transformer is complex to manufacture, and has a high manufacturing cost, which is prone to cause a problem of market supply shortage. Therefore, a network transformer with simple and low cost is needed.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a capacitance-separated transformer circuit for solving the problems of complicated manufacture and high manufacture cost of the network transformer.

The present disclosure provides a capacitance-separated voltage transformation circuit, which includes: a transmit sub-circuit and a receive sub-circuit;

wherein the transmitting sub-circuit comprises a first common mode inductor U702, a second common mode inductor U703, a first capacitor C707 and a second capacitor C708, wherein a first end of a first coil of the first common mode inductor U702 is connected with a first end of the first capacitor C707, a second end of the first capacitor C707 is configured to be connected with MDI _ TP, a first end of a second coil of the first common mode inductor U702 is connected with a first end of the second capacitor C708, a second end of the second capacitor C708 is configured to be connected with MDI _ TN, a second end of the first coil of the first common mode inductor U702 is configured to be connected with TX +, a second end of the second coil of the first common mode inductor U702 is configured to be connected with TX-, a first end of the first coil of the second common mode inductor U703 is connected with a second end of the first coil of the first common mode inductor U702, a second end of the first coil of the second common mode inductor U703 is connected with TXMGND, a first end of the second coil of the second common-mode inductor U703 is connected to the TXM _ GND, and a second end of the second coil of the second common-mode inductor U703 is configured to be connected to TX-;

wherein the receiving sub-circuit comprises a third common-mode inductor U704, a fourth common-mode inductor U705, a third capacitor C709 and a fourth capacitor C710, wherein a first end of the first coil of the third common-mode inductor U704 is connected with a first end of the third capacitor C709, a second end of the third capacitor C709 is configured to be connected with MDI _ RP, a first end of the second coil of the third common-mode inductor U704 is connected with a first end of the fourth capacitor C710, a second end of the fourth capacitor C710 is configured to be connected with MDI _ RN, a second end of the first coil of the third common-mode inductor U704 is configured to be connected with RX +, a second end of the second coil of the third common-mode inductor U704 is configured to be connected with RX-, a first end of the first coil of the fourth common-mode inductor U705 is connected with a second end of the first coil of the third common-mode inductor TXU 704, a second end of the first coil of the fourth common-mode inductor U705 is connected with M _ GND, a first end of the second coil of the fourth common-mode inductor U705 is connected to the TXM _ GND, and a second end of the second coil of the fourth common-mode inductor U705 is configured to be connected to RX-.

In one embodiment, the first capacitor C707, the second capacitor C708, the third capacitor C709 and the fourth capacitor C710 are all 0.1uF/50 v.

In one embodiment, the first common mode inductor U702 and the third common mode inductor U704 are WCMs 2012F2 SF-801-N.

In one embodiment, the second common-mode inductor U703 and the fourth common-mode inductor U705 are DCM3216F2SF-600T 02.

The capacitance separation type transformation circuit is provided with two capacitors and a filter inductor in the transmitting sub-circuit and the receiving sub-circuit. Compared with an inductive structure, the capacitive structure uses 0.1uF to replace one group of coils of the transformer, so that the cost is reduced, the high-frequency characteristic is better, and the lightning protection effect is enhanced.

Drawings

FIG. 1 is a circuit diagram of a conventional inductive circuit in one embodiment;

fig. 2 is a circuit diagram of a capacitance-separated transformer circuit according to an embodiment.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Fig. 2 is a circuit diagram of a capacitance-separation type transformer circuit according to an embodiment, and as shown in fig. 2, the capacitance-separation type transformer circuit 100 includes:

the capacitance separation type voltage transformation circuit comprises: a transmitting sub-circuit 101 and a receiving sub-circuit 102;

wherein the transmitting sub-circuit 101 comprises a first common mode inductor U702, a second common mode inductor U703, a first capacitor C707 and a second capacitor C708, wherein a first end of a first coil of the first common mode inductor U702 is connected with a first end of the first capacitor C707, a second end of the first capacitor C707 is configured to be connected with MDI _ TP, a first end of a second coil of the first common mode inductor U702 is connected with a first end of the second capacitor C708, a second end of the second capacitor C708 is configured to be connected with MDI _ TN, a second end of the first coil of the first common mode inductor U702 is configured to be connected with TX +, a second end of the second coil of the first common mode inductor U702 is configured to be connected with TX-, a first end of the first coil of the second common mode inductor U703 is connected with a second end of the first coil of the first common mode inductor U702, and a second end of the first coil of the second common mode inductor U703 is connected with TXM _ GND, a first end of a second coil of the second common-mode inductor U703 is connected to the TXM _ GND, and a second end of the second coil of the second common-mode inductor U703 is configured to be connected to TX-;

wherein the receiving sub-circuit 102 comprises a third common-mode inductor U704, a fourth common-mode inductor U705, a third capacitor C709 and a fourth capacitor C710, wherein a first end of a first coil of the third common-mode inductor U704 is connected with a first end of the third capacitor C709, a second end of the third capacitor C709 is configured to be connected with MDI RP, a first end of a second coil of the third common-mode inductor U704 is connected with a first end of the fourth capacitor C710, a second end of the fourth capacitor C710 is configured to be connected with MDI RN, a second end of a first coil of the third common-mode inductor U704 is configured to be connected with RX +, a second end of a second coil of the third common-mode inductor U704 is configured to be connected with RX-, a first end of a first coil of the fourth common-mode inductor U705 is connected with a second end of a first coil of the third common-mode inductor TX704, a second end of a first coil of the fourth common-mode inductor TXU 705 is connected with M GND', a first end of the second coil of the fourth common-mode inductor U705 is connected to the TXM _ GND, and a second end of the second coil of the fourth common-mode inductor U705 is configured to be connected to RX-.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-described embodiments are merely illustrative of several embodiments of the present disclosure, which are described in more detail and detailed, but are not to be construed as limiting the scope of the disclosure. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the concept of the present disclosure, and these changes and modifications are all within the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the appended claims.

Claims

1. A capacitively split transformer circuit, comprising:

a transmitting sub-circuit (101) and a receiving sub-circuit (102);

wherein the transmitting sub-circuit (101) comprises a first common mode inductor U702, a second common mode inductor U703, a first capacitor C707 and a second capacitor C708, wherein a first end of a first coil of the first common mode inductor U702 is connected with a first end of the first capacitor C707, a second end of the first capacitor C707 is configured to be connected with MDI TP, a first end of a second coil of the first common mode inductor U702 is connected with a first end of the second capacitor C708, a second end of the second capacitor C708 is configured to be connected with MDI TN, a second end of the first coil of the first common mode inductor U702 is configured to be connected with TX +, a second end of the second coil of the first common mode inductor U702 is configured to be connected with TX-, a first end of the first coil of the second common mode inductor U703 is connected with a second end of the first coil of the first common mode inductor U702, and a second end of the first coil of the second common mode inductor U703 is connected with M GND, a first end of the second coil of the second common-mode inductor U703 is connected to the TXM _ GND, and a second end of the second coil of the second common-mode inductor U703 is configured to be connected to TX-;

wherein the receiving sub-circuit (102) comprises a third common mode inductor U704, a fourth common mode inductor U705, a third capacitor C709 and a fourth capacitor C710, wherein a first end of a first coil of the third common mode inductor U704 is connected with a first end of the third capacitor C709, a second end of the third capacitor C709 is configured to be connected with MDI _ RP, a first end of a second coil of the third common mode inductor U704 is connected with a first end of the fourth capacitor C710, a second end of the fourth capacitor C710 is configured to be connected with MDI _ RN, a second end of a first coil of the third common mode inductor U704 is configured to be connected with RX +, a second end of a second coil of the third common mode inductor U704 is configured to be connected with RX-, a first end of a first coil of the fourth common mode inductor U705 is connected with a second end of a first coil of the third common mode inductor TXU 704, a second end of a first coil of the fourth common mode inductor U705 is connected with M _ GND, a first end of the second coil of the fourth common-mode inductor U705 is connected to the TXM _ GND, and a second end of the second coil of the fourth common-mode inductor U705 is configured to be connected to RX-.

2. The capacitance-separated transformer circuit of claim 1, wherein the first capacitor C707, the second capacitor C708, the third capacitor C709 and the fourth capacitor C710 are all 0.1uF/50 v.

3. The capacitive-separation-type transformer circuit of claim 1, wherein the first common-mode inductor U702 and the third common-mode inductor U704 are WCM2012F2 SF-801-N.

4. The capacitance-separated transformer circuit of claim 1, wherein the second common-mode inductor U703 and the fourth common-mode inductor U705 are DCM3216F2SF-600T 02.