Four-wire and two-wire conversion circuit for baseband transmission
By designing a four- and two-wire conversion circuit for baseband transmission, the baseband signal is directly loaded onto the two-core wire for transmission by using the combination of PHY chip and transformer, the problem of high baseband signal transmission in old communities is solved and effective signal transmission is achieved and reduce wiring costs.
Patent Information
- Application Number
- CN202420902103.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-26
AI Technical Summary
The prior art is difficult to realize the effective transmission of baseband signals without significantly changing the original circuit, especially in old communities, where the wiring costs are high due to the lack of network cable coverage.
A four- and two-wire conversion circuit for baseband transmission is designed. Through the combination of PHY chip and transformer, the baseband signal is directly loaded onto the two-core wire for transmission. The primary and secondary windings of the transformer are connected to avoid the problem of self-looping of the line. .
It realizes that the baseband signal is effectively transmitted without significantly changing the original circuit, which reduces the wiring cost, and the circuit structure is simple, debugging and maintenance are more convenient, avoiding the problem of self-looping of the line.
Smart Images
Figure CN222464731U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of signals and power supplies, and in particular to a four-to-two-wire conversion circuit for baseband transmission. Background Art
[0002] At present, with the rapid development of network technology, residents' demand for the Internet is becoming more and more urgent. Network data transmission usually adopts baseband transmission, and baseband transmission is generally based on data transmission and data interconnection of network cables. However, there are still a large number of residential areas that were built earlier. When the community was wired, the residential areas were not covered with network cables. Only two-core telephone lines or coaxial cables were configured. If the network cables are re-laid, relatively high renovation costs will be involved. Therefore, how to achieve baseband signal transmission without significantly changing the original lines is of high value for the renovation of old communities. Utility Model Content
[0003] The main purpose of the present application is to provide a four-to-two-wire conversion circuit for baseband transmission, so as to directly load the baseband signal onto two-core wires for transmission, thereby reducing wiring costs.
[0004] In order to achieve the above object, the present application provides a four-to-two-wire conversion circuit for baseband transmission, comprising:
[0005] A PHY chip, wherein the PHY chip is electrically connected to a transformer;
[0006] The transformer comprises a primary winding A and a secondary winding C, a primary winding E and a secondary winding F, a primary winding B and a secondary winding E;
[0007] The TX+ pin of the PHY chip is connected to the corresponding primary winding A, and the TX- pin is connected to the corresponding primary winding B;
[0008] The RX+ and RX- pins of the PHY chip are respectively connected to the two ends of the secondary winding E;
[0009] Two ends of the primary winding E are connected to one end of the primary winding A and one end of the primary winding B respectively, and two ends of the secondary winding F are connected to two-core wires and output PODL+ and PODL-.
[0010] Further, the TX+ pin of the PHY chip is connected to the corresponding middle tap of the primary winding A, and the TX- pin of the PHY chip is connected to the corresponding middle tap of the primary winding B.
[0011] Further, one end of the primary winding A away from the primary winding E is connected to one end of the primary winding B away from the primary winding E through an impedance resistor and a second DC blocking capacitor.
[0012] Further, one end of the secondary winding F outputting the PODL- is connected to one of the two-core wires through a first DC blocking capacitor.
[0013] Furthermore, the impedance of the impedance resistor-the first DC blocking capacitor is equal to the impedance of the primary winding E, so that the TX signal on the primary winding B is offset, thereby preventing the PHY chip from receiving the TX signal.
[0014] Furthermore, two ends of the secondary winding C are connected via a resistor.
[0015] Furthermore, the primary winding A is divided into a primary winding A1 and a primary winding A2 through a middle tap, the other end of the primary winding A1 is connected to the impedance resistor R1, and the other end of the primary winding A2 is connected to one end of the primary winding E.
[0016] Furthermore, the primary winding B is divided into a primary winding B1 and a primary winding B2 by a middle tap, the other end of the primary winding B1 is connected to the second DC blocking capacitor, and the other end of the primary winding B2 is connected to an end of the primary winding E away from the primary winding A2.
[0017] Furthermore, there are two PHY chips and two transformers, the connection between the two groups of PHY chips and transformers is a mirror image setting, and the two transformers are connected through the two-core wire.
[0018] The four-to-two-wire conversion circuit for baseband transmission provided by the utility model directly loads the baseband signal onto two-core wires for transmission, thus avoiding large-scale rewiring. At the same time, the circuit design can effectively solve the problem of line self-looping, and the circuit structure is simple, making debugging and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:
[0020] Figure 1 Schematic diagram of the structure of the four-to-two-wire conversion circuit for baseband transmission in this embodiment. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.
[0022] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0023] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0024] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0025] In addition, the term "plurality" shall mean two or more.
[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0027] refer to Figure 1A four-to-two-wire conversion circuit for baseband transmission includes a PHY chip, the PHY chip is electrically connected to a transformer T1, further, there are two PHY chips, each PHY chip is electrically connected to a transformer, and the two groups of PHY chips and transformers are connected in a mirror image configuration. Figure 1 The figure shows the connection method of two groups of PHY chips and transformer connection combinations. Specifically, the TR+ pins of transformer T1 and transformer T2 are connected through wires and transmit PODL+ signals, and the TR- pins of transformer T1 and transformer T2 are connected through corresponding first DC blocking capacitors C1 and C2, respectively, and transmit PODL- signals.
[0028] This embodiment is explained by taking a connection combination of a group of PHY chips and a transformer as an example. Specifically, the transformer includes a primary winding A and a secondary winding C, a primary winding E and a secondary winding F, a primary winding B and a secondary winding E. Further, the primary winding A is divided into a primary winding A1 and a primary winding A2 by a middle tap, and the primary winding B is divided into a primary winding B1 and a primary winding B2 by a middle tap. The other end of the primary winding A2, that is, the end not having the middle tap, is connected to one end of the primary winding E, and the other end of the primary winding B2, that is, the end not having the middle tap, is connected to the end of the primary winding E away from the primary winding A2. Further, the other end of the primary winding A1, that is, the end not having the middle tap, is connected to the impedance resistor R1, and the other end of the primary winding B1, that is, the end not having the middle tap, is connected to the second DC blocking capacitor C3. Further, the two ends of the secondary winding C are connected through a resistor R3.
[0029] The two ends of the secondary winding F are respectively connected to the TR+ pin and the TR- pin of the transformer T1, so that one end of the secondary winding F outputs a PODL+ signal, and the other end outputs a PODL- signal through the first DC blocking capacitor C1.
[0030] The TX+ pin of the PHY chip is connected to the corresponding primary winding A, and the TX- pin is connected to the corresponding primary winding B. Specifically, the TX+ pin is connected to the middle tap of the primary winding A, and the TX- pin is connected to the middle tap of the primary winding B.
[0031] The RX+ and RX- pins of the PHY chip are connected to the two ends of the secondary winding E respectively.
[0032] refer to Figure 1 When the signal is sent, the TX+ signal of the PHY chip is transmitted to the middle tap of the primary winding A through the TD+ pin of the transformer T1, and then through the primary winding A2-primary winding E-primary winding B2-TD-pin, and then back to the TD-pin of the PHY chip. In this way, the signal is transmitted from the primary winding E to the secondary winding F, and further output to the wire through the first DC blocking capacitor C1.
[0033] At the same time, in this embodiment, the impedance between the impedance resistor R1 and the first DC blocking capacitor C1 is equal to the impedance of the primary winding E, so that when the signal is sent, the TX signals received on the primary winding B1 and the primary winding B2 are offset, thereby preventing the RX end of the PHY chip from receiving the TX signal and effectively avoiding line loops.
[0034] When receiving the signal, the signal on the wire passes through secondary winding F—primary winding E—primary winding A2—primary winding A1—impedance resistor R1—second DC blocking capacitor C3—primary winding B1—primary winding B2—secondary winding E. At this time, the signal polarity on the primary winding B1 and the primary winding B2 is the same, and the signal can be returned to the RX end of the PHY chip.
[0035] It should be noted that the above description is for the circuit design between a group of PHY chips and the transformer connected thereto. This embodiment illustrates that two groups of PHY chips and the transformer connected thereto are mirror images. Therefore, the circuit configuration of another group of PHY chips and the transformer connected thereto is a mirror image relationship with the above description.
[0036] In summary, the four-to-two-wire conversion circuit for baseband transmission disclosed in this application can realize the transmission of baseband signals through two core wires, and the peripheral circuits of the PHY chip are designed to avoid line self-loops, thereby ensuring smooth signal reception and transmission.
[0037] The specific manner of executing the operation of each unit in the above embodiment has been described in detail in the embodiment of the method, and will not be elaborated here.
[0038] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A four-to-two-wire conversion circuit for baseband transmission, characterized in that: include: A PHY chip, wherein the PHY chip is electrically connected to a transformer; The transformer comprises a primary winding A and a secondary winding C, a primary winding E and a secondary winding F, a primary winding B and a secondary winding E; The TX+ pin of the PHY chip is connected to the corresponding primary winding A, and the TX- pin is connected to the corresponding primary winding B; The RX+ and RX- pins of the PHY chip are respectively connected to the two ends of the secondary winding E; Two ends of the primary winding E are connected to one end of the primary winding A and one end of the primary winding B respectively, and two ends of the secondary winding F are connected to two-core wires and output PODL+ and PODL-.
2. The four-to-two-wire conversion circuit for baseband transmission according to claim 1, characterized in that: The TX+ pin of the PHY chip is connected to the corresponding middle tap of the primary winding A, and the TX- pin of the PHY chip is connected to the corresponding middle tap of the primary winding B.
3. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 2, characterized in that: One end of the primary winding A away from the primary winding E is connected to one end of the primary winding B away from the primary winding E through an impedance resistor and a second DC blocking capacitor.
4. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 3, characterized in that: One end of the secondary winding F that outputs the PODL- is connected to one of the two-core wires through a first DC blocking capacitor.
5. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 4, characterized in that: The impedance of the impedance resistor-the first DC blocking capacitor is equal to the impedance of the primary winding E, so that the TX signal on the primary winding B is offset, thereby preventing the PHY chip from receiving the TX signal.
6. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 1, characterized in that: The two ends of the secondary winding C are connected via a resistor.
7. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 3, characterized in that: The primary winding A is divided into a primary winding A1 and a primary winding A2 by a middle tap, the other end of the primary winding A1 is connected to the impedance resistor R1, and the other end of the primary winding A2 is connected to one end of the primary winding E.
8. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 7, characterized in that: The primary winding B is divided into a primary winding B1 and a primary winding B2 by a middle tap, the other end of the primary winding B1 is connected to the second DC blocking capacitor, and the other end of the primary winding B2 is connected to an end of the primary winding E away from the primary winding A2.
9. The four-to-two-wire conversion circuit for baseband transmission as claimed in claim 1, characterized in that: There are two PHY chips and two transformers, and the connection between the two groups of PHY chips and transformers is a mirror image setting. The two transformers are connected through the two-core wire.