Master device, slave device of building intercom system and building intercom system

Abstract

The present application provides a main device, a slave device and a building intercom system of a building intercom system. The main device includes a main circuit, and the main circuit includes a main power supply terminal, a main signal processing circuit and a main interface circuit. The main interface circuit is electrically connected to a main communication terminal, a main power receiving terminal and the main power supply terminal. The main interface circuit includes a main communication interface circuit, a main power interface circuit and a main interface. The main communication interface circuit is electrically connected to the main communication terminal, the main power interface circuit is electrically connected to the main power receiving terminal and the main power supply terminal, and both the main communication interface circuit and the main power interface circuit are electrically connected to a first main wiring terminal and a second main wiring terminal of the main interface. The first main wiring terminal and the second main wiring terminal are used for being electrically connected to the slave device of the building intercom system through a transmission line. The transmission of the communication signal and the power signal of the main device can be realized, the wiring is reduced, and it is safe and reliable.

Description

Technical Field

[0001] This application relates to the technical field of security equipment, and particularly to a host device, a slave device and a building intercom system of a building intercom system. Background Art

[0002] With the continuous increase of residential buildings, the property management of communities has become increasingly important. Among them, the management methods of visitor registration and on-duty doorman are no longer suitable for the requirements of modern management for quickness, convenience and safety. The building intercom system consists of anti-theft doors installed at each unit entrance, an administrator's console at the community's central control center, an intercom host at the building entrance, an electric control lock, a door closer, and a visual intercom slave at the user's home through a dedicated network. In the building intercom system, a relatively high requirement is placed on the signal transmission distance. At present, the wiring of the signal transmission line and the power transmission line of the building intercom system needs to be improved. Summary of the Invention

[0003] This application provides an improved host device, a slave device and a building intercom system of a building intercom system.

[0004] This application provides a host device of a building intercom system. The host device includes a host circuit, and the host circuit includes:

[0005] A host power supply terminal for receiving a supply voltage;

[0006] A host signal processing circuit including a host communication terminal and a host power receiving terminal, and the host power receiving terminal is electrically connected to the host power supply terminal;

[0007] A host interface circuit is electrically connected to the host communication terminal, the host power receiving terminal and the host power supply terminal; the host interface circuit includes a host communication interface circuit, a host power interface circuit and a host interface. The host communication interface circuit is electrically connected to the host communication terminal, the host power interface circuit is electrically connected to the host power receiving terminal and the host power supply terminal. The host interface includes a first host wiring terminal and a second host wiring terminal. The host communication interface circuit and the host power interface circuit are both electrically connected to the first host wiring terminal and the second host wiring terminal. The first host wiring terminal and the second host wiring terminal are used to be electrically connected to the slave device of the building intercom system through a transmission line.

[0008] Optionally, the host power supply terminal includes a first host power supply terminal and a second host power supply terminal. The host power receiving terminal includes a host signal power supply terminal electrically connected to the first host power supply terminal and a host signal ground terminal electrically connected to the second host power supply terminal. The host power interface circuit includes a host interface ground terminal electrically connected to the second host power supply terminal. The host signal ground terminal and the host interface ground terminal are electrically isolated from each other.

[0009] Optionally, the host interface circuit includes a first isolation circuit electrically connected between the host signal ground terminal and the host interface ground terminal.

[0010] Optionally, the host power interface circuit includes a host surge protection circuit electrically connected between the host power supply terminal and the host interface.

[0011] Optionally, the host power interface circuit includes a host surge protection circuit and a second isolation circuit electrically connected to the host surge protection circuit. The second isolation circuit is electrically connected between the host interface and the host power supply terminal, and is also electrically connected between the host surge protection circuit and the host interface.

[0012] Optionally, the host power interface circuit includes a first filtering circuit electrically connected between the host interface and the host power receiving terminal, and between the host interface ground terminal and the host signal ground terminal. The host power supply terminal is electrically connected between the first filtering circuit and the host interface.

[0013] Optionally, the host communication interface circuit includes a third isolation circuit electrically connected between the host interface and the host communication terminal.

[0014] Optionally, the host device includes a host printed circuit board on which the host circuits are integrated. The host printed circuit board includes a host signal area and a host interface area that are spaced apart from each other. The host signal processing circuit is disposed in the host signal area, and the host interface circuit is disposed in the host interface area.

[0015] Optionally, the host power receiving terminal includes a host signal ground terminal, and the host interface circuit includes a host interface ground terminal; the host printed circuit board includes multiple layers of host circuit boards, and the multiple layers of host circuit boards include at least one host ground plane; the host ground plane is provided with the host signal ground terminal and the host interface ground terminal, and a first anti-interference distance is set between the host signal ground terminal and the host interface ground terminal on the same layer of the host ground plane, where the first anti-interference distance is not less than 20 mil.

[0016] Optionally, the host ground plane includes a host signal ground layer serving as the host signal ground terminal and a host interface ground layer serving as the host interface ground terminal.

[0017] Optionally, the host power interface circuit includes a first filter circuit, which is electrically connected between the host interface and the host power receiving end, between the ground terminal of the host interface and the signal ground terminal of the host, and the host power supply end is electrically connected between the first filter circuit and the host interface; the host signal ground layer avoids the orthographic projection area of the first filter circuit on the host ground board.

[0018] Optionally, the host communication interface circuit includes a third isolation circuit, which is electrically connected between the host interface and the host communication end; the third isolation circuit includes a transformer; the host signal ground layer avoids the orthographic projection area of the transformer on the host ground board.

[0019] Optionally, the host interface ground layer avoids the orthographic projection areas of the first host connection terminal and the second host connection terminal on the host ground board.

[0020] Optionally, the host printed circuit board includes multiple layers of host circuit boards; a second anti-interference distance is set between the host interface circuit and the host signal ground terminal on the same layer of the host circuit board, and the second anti-interference distance is not less than 20 mil.

[0021] Optionally, a third anti-interference distance is set between the first host connection terminal and the second host connection terminal and the host signal ground terminal and the host interface ground terminal on the same layer of the host circuit board, where the third anti-interference distance is not less than 20 mil.

[0022] This application also provides a slave device for a building intercom system, and the slave device includes a slave circuit, and the slave circuit includes:

[0023] A slave signal processing circuit, including a slave communication end and a slave power receiving end;

[0024] A slave interface circuit, which is electrically connected to the slave communication end and the slave power receiving end; the slave interface circuit includes a slave communication interface circuit, a slave power interface circuit and a slave interface, the slave communication interface circuit is electrically connected to the slave communication end, the slave power interface circuit is electrically connected to the slave power receiving end, the slave interface includes a first slave connection terminal and a second slave connection terminal, both the slave communication interface circuit and the slave power interface circuit are electrically connected to the first slave connection terminal and the second slave connection terminal, and the first slave connection terminal and the second slave connection terminal are used to be electrically connected to the host device of the building intercom system through a transmission line.

[0025] Optionally, the slave power receiving end includes a slave signal power supply end and a slave signal ground end, the slave power interface circuit includes a slave interface ground end, and the slave signal ground end and the slave interface ground end are electrically isolated from each other.

[0026] Optionally, the slave interface circuit includes a fourth isolation circuit, and the fourth isolation circuit is electrically connected between the slave signal ground end and the slave interface ground end.

[0027] Optionally, the slave power interface circuit includes a slave surge protection circuit, and the slave surge protection circuit is electrically connected between the slave power receiving end and the slave interface.

[0028] Optionally, the slave power interface circuit includes a slave surge protection circuit and a fifth isolation circuit electrically connected to the slave surge protection circuit. The fifth isolation circuit is electrically connected between the slave interface and the slave power receiving end, and is also electrically connected between the slave surge protection circuit and the slave interface.

[0029] Optionally, the slave power interface circuit includes a second filter circuit, and the second filter circuit is electrically connected between the slave interface and the slave power receiving end, and is also electrically connected between the slave interface ground end and the slave signal ground end.

[0030] Optionally, the slave communication interface circuit includes a sixth isolation circuit, and the sixth isolation circuit is electrically connected between the slave interface and the slave communication end.

[0031] Optionally, the slave device includes a slave printed circuit board, the slave circuits are integrated on the slave printed circuit board. The slave printed circuit board includes a slave signal area and a slave interface area that are spaced apart from each other. The slave signal processing circuit is disposed in the slave signal area, and the slave interface circuit is disposed in the slave interface area.

[0032] Optionally, the slave power receiving end includes a slave signal ground end, and the slave interface circuit includes a slave interface ground end; the slave printed circuit board includes multiple layers of slave circuit boards, and the multiple layers of slave circuit boards include at least one layer of slave ground board; the slave ground board is provided with the slave signal ground end and the slave interface ground end, and a fourth anti-interference distance is set between the slave signal ground end and the slave interface ground end on the same layer of the slave ground board, where the fourth anti-interference distance is not less than 20 mil.

[0033] Optionally, the slave grounding plate includes a slave signal grounding layer serving as the slave signal grounding terminal and a slave interface grounding layer serving as the slave interface grounding terminal; the slave power interface circuit includes a second filtering circuit, and the second filtering circuit is electrically connected between the slave interface and the slave power receiving terminal and between the slave interface grounding terminal and the slave signal grounding terminal; the slave signal grounding layer avoids the orthographic projection area of the second filtering circuit on the slave grounding plate.

[0034] Optionally, the slave interface grounding layer avoids the orthographic projection areas of the first slave wiring terminal and the second slave wiring terminal on the slave grounding plate.

[0035] Optionally, the slave communication interface circuit includes a sixth isolation circuit, and the sixth isolation circuit is electrically connected between the slave interface and the slave communication terminal; the sixth isolation circuit includes a transformer; the slave signal grounding layer avoids the orthographic projection area of the transformer on the slave grounding plate.

[0036] Optionally, the slave printed circuit board includes multiple layers of slave circuit boards; a fifth anti-interference distance is provided between the slave interface circuit of the slave circuit boards arranged on the same layer and the slave signal grounding terminal, and the fifth anti-interference distance is not less than 20 mil.

[0037] Optionally, a sixth anti-interference distance is provided between the first slave wiring terminal and the second slave wiring terminal and the slave signal grounding terminal and the slave interface grounding terminal of the slave circuit boards arranged on the same layer, and the sixth anti-interference distance is not less than 20 mil.

[0038] This application further provides a building intercom system, including:

[0039] The host device as described in any one of the above embodiments; and

[0040] The slave device as described in any one of the above embodiments, and the slave device is electrically connected to the host device through a transmission line.

[0041] For the host device of the building intercom system in the embodiment of this application, the host communication interface circuit of the host interface circuit is electrically connected to the host communication terminal, the host power interface circuit of the host interface circuit is electrically connected to the host power receiving terminal and the host power supply terminal, and the host communication interface circuit and the host power interface circuit use the host interface to enable the host communication interface circuit and the host power interface circuit to be electrically connected to the slave device of the building intercom system through a shared transmission line, so as to realize the transmission of the communication signal and the power signal of the host device, reduce wiring, and have a simple structure, being safe and reliable.

[0042] The slave device of the building intercom system according to the embodiment of the present application, the slave communication interface circuit of the slave interface circuit is electrically connected to the slave communication end and the slave interface, the slave power interface circuit of the slave interface circuit is electrically connected to the slave power receiving end and the slave interface, and the slave communication interface circuit and the slave power interface circuit use the slave interface to enable the slave communication interface circuit and the slave power interface circuit to be electrically connected to the master device of the building intercom system through a shared transmission line, which can realize the transmission of communication signals and power signals of the slave device, reduce wiring, and has a simple structure, and is safe and reliable.

[0043] The building intercom system according to the embodiment of the present application, the slave device is communicated and powered by the master device, and has a simple structure, and is safe and reliable.

[0044] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0045] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0046] Figure 1 Shown is a circuit diagram of an embodiment of the master circuit and the slave circuit of the present application.

[0047] Figure 2 Shown is a schematic structural diagram of an embodiment of the master printed circuit board of the present application.

[0048] Figure 3 Shown as Figure 2 The circuit distribution diagram of the master ground board of the master printed circuit board shown.

[0049] Figure 4 Shown is a schematic structural diagram of an embodiment of the slave printed circuit board of the present application.

[0050] Figure 5 Shown as Figure 4 The circuit distribution diagram of the slave ground board of the slave printed circuit board shown. Detailed Description of the Embodiments

[0051] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0052] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second" and similar words used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a limitation of quantity, but mean that there is at least one. "Plurality" or "several" means two or more. Unless otherwise indicated, words such as "front", "rear", "lower" and / or "upper" are for convenience of description only and are not limited to one position or a spatial orientation. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0053] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the" and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0054] This application provides a main device of a building intercom system. The main device includes a main circuit, and the main circuit includes a main power supply terminal, a main signal processing circuit and a main interface circuit. The main power supply terminal is used to receive a supply voltage. The main signal processing circuit includes a main communication terminal and a main power receiving terminal, and the main power receiving terminal is electrically connected to the main power supply terminal. The main interface circuit is electrically connected to the main communication terminal, the main power receiving terminal and the main power supply terminal. The main interface circuit includes a main communication interface circuit, a main power interface circuit and a main interface. The main communication interface circuit is electrically connected to the main communication terminal, the main power interface circuit is electrically connected to the main power receiving terminal and the main power supply terminal, the main interface includes a first main wiring terminal and a second main wiring terminal, the main communication interface circuit and the main power interface circuit are both electrically connected to the first main wiring terminal and the second main wiring terminal, and the first main wiring terminal and the second main wiring terminal are used to be electrically connected to a slave device of the building intercom system through a transmission line. With such an arrangement, the main communication interface circuit and the main power interface circuit are electrically connected to the slave device of the building intercom system through a shared transmission line, which can realize the transmission of the communication signal and the power signal of the main device, reduce wiring, and has a simple structure, and is safe and reliable.

[0055] The present application also provides a slave device of a building intercom system. The slave device includes a slave circuit, and the slave circuit includes a slave signal processing circuit and a slave interface circuit. The slave signal processing circuit includes a slave communication terminal and a slave power receiving terminal. The slave interface circuit is electrically connected to the slave communication terminal and the slave power receiving terminal; the slave interface circuit includes a slave communication interface circuit, a slave power interface circuit and a slave interface, the slave communication interface circuit is electrically connected to the slave communication terminal, the slave power interface circuit is electrically connected to the slave power receiving terminal, the slave interface includes a first slave terminal PLC-P and a second slave terminal, the slave communication interface circuit and the slave power interface circuit are both electrically connected to the first slave terminal PLC-P and the second slave terminal, and the first slave terminal PLC-P and the second slave terminal are used to be electrically connected to the host device of the building intercom system through a transmission line. With this arrangement, the slave communication interface circuit and the slave power interface circuit are electrically connected to the host device of the building intercom system through a common transmission line, which can realize the transmission of communication signals and power signals of the slave device, reduce wiring, simplify the structure, and be safe and reliable.

[0056] The present application also provides a building intercom system, comprising the above-mentioned host device and the above-mentioned slave device, wherein the slave device is electrically connected to the host device via a transmission line. In this arrangement, the slave device communicates and is powered by the host device, and has a simple structure, and is safe and reliable.

[0057] The present application provides a host device, a slave device and a building intercom system of a building intercom system. The host device, the slave device and the building intercom system of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0058] The building intercom system is composed of anti-theft doors installed at the entrance of each unit, the administrator switchboard of the community control center, the intercom host at the entrance and exit of the building, the electric lock, the door closer and the visual intercom slave in the user's home through a dedicated network. In order to realize intercom between visitors and residents, the residents can remotely open the anti-theft door, and the visitors at the staircase entrances of each unit can call the residents through the intercom host. They can enter the building only after the other party agrees, thereby restricting the entry of illegal persons. At the same time, if a resident is robbed or suddenly falls ill at home, the security personnel can be notified through the system to get timely support and processing. In some embodiments, the building intercom system includes a host device and a slave device. At least one slave device can be set. For example, one or more slave devices can be set. One or more slave devices share the same host device control. The host device can power multiple slaves and send communication signals. In this way, the slave device communicates and powers through the host device, and the structure is simple, safe and reliable.

[0059] In some embodiments, the host device includes a host circuit 10, which is used to implement the host functions of the host device. The slave device includes a slave circuit 20, which is used to implement the slave functions of the slave device. The slave circuit 20 is electrically connected to the host circuit 10 through a transmission line. The host circuit 10 is powered by an external power supply, and the slave circuit 20 is powered through the host circuit 10. In some embodiments, the transmission line can be a two-wire transmission line, which uses power lines to carry high-frequency digital signals / analog signals and uses two power lines to achieve the functions of power supply and communication. This can effectively save wiring costs, reduce wiring, has a simple structure, and is safe and reliable.

[0060] Figure 1 The following shows a circuit diagram of an embodiment of the host circuit 10 and the slave circuit 20 of the present application. As Figure 1 shown, the host circuit 10 includes a host power supply terminal 11, a host signal processing circuit 12, and a host interface circuit 13. Among them, the host power supply terminal 11 is connected to an external power supply (not shown) to receive a supply voltage for supplying power to the host signal processing circuit 12 and the host interface circuit 13. The external power supply can provide direct current. The host signal processing circuit 12 can process signals and communicate with the slave circuit 20. The host signal processing circuit 12 includes a host communication terminal 121 and a host power receiving terminal 122, and the host power receiving terminal 122 is electrically connected to the host power supply terminal 11. The host power receiving terminal 122 includes the power supply terminal and the ground terminal of the host signal processing circuit 12. The host power supply terminal 11 supplies power to the host signal processing circuit 12, providing the voltage required for the host signal processing circuit 12 to operate.

[0061] The host interface circuit 13 is electrically connected to the host communication terminal 121, the host power receiving terminal 122, and the host power supply terminal 11. The host interface circuit 13 includes a host communication interface circuit 131, a host power interface circuit 132, and a host interface 133. The host communication interface circuit 131 is electrically connected to the host communication terminal 121, and the host power interface circuit 132 is electrically connected to the host power receiving terminal 122 and the host power supply terminal 11. The host signal processing circuit 12 communicates with the slave circuit 20 through the host communication interface circuit 131 and the host interface 133. The host communication interface circuit 131 can be used to isolate the host communication terminal 121 from the host interface 133.

[0062] The host power supply terminal 11 supplies power to the host signal processing circuit 12 through the host power interface circuit 132, and supplies power to the slave circuit 20 through the host power interface circuit 132 and the host interface 133. The host power interface circuit 132 can be used to isolate the host power receiving terminal 122, the host power supply terminal 11 from the host interface 133 to improve the anti-interference ability.

[0063] The host interface 133 includes a first host terminal PLC-P and a second host terminal PLC-N. Both the host communication interface circuit 131 and the host power interface circuit 132 are electrically connected to the first host terminal PLC-P and the second host terminal PLC-N. The first host terminal PLC-P and the second host terminal PLC-N are used to be electrically connected to a slave device of the building intercom system through a transmission line (not shown). The host power supply terminal 11 is connected to the first host terminal PLC-P and the second host terminal PLC-N through the host power interface circuit 132. In some embodiments, the host power supply terminal 11 includes a first host power supply terminal DC+ and a second host power supply terminal DC-. The first host power supply terminal DC+ and the second host power supply terminal DC- are used to connect to an external power supply. The first host power supply terminal DC+ is connected to the second host terminal PLC-N, and the second host power supply terminal DC- is connected to the first host terminal PLC-P. The host communication terminal 121 is connected to the first host terminal PLC-P and the second host terminal PLC-N through the host communication interface circuit 131. The host communication terminal 121 includes two terminals for transmitting differential signals, which are respectively connected to the first host terminal PLC-P and the second host terminal PLC-N correspondingly. The host communication interface circuit 131 and the host power interface circuit 132 are electrically connected to the slave device of the building intercom system through a shared transmission line, which can realize the transmission of the communication signal and the power signal of the host device, reduce wiring, and has a simple structure, being safe and reliable.

[0064] The host power receiving terminal 122 includes a host signal power supply terminal VCC1 electrically connected to the first host power supply terminal DC+, and a host signal ground terminal GND electrically connected to the second host power supply terminal DC-. The host signal power supply terminal can be used as the power supply terminal of the host signal processing circuit 12. The host signal ground terminal GND can be used as the ground terminal of the host signal processing circuit 12. The host power interface circuit 132 includes a host interface ground terminal PGND electrically connected to the second host power supply terminal DC-. The host signal ground terminal GND and the host interface ground terminal PGND are electrically isolated from each other. Since the external host interface 133 is the main electromagnetic interference source, the host signal processing circuit 12 is separated from the host interface circuit 13, so that the interference energy entering from the external host interface 133 affects the host signal processing circuit 12 as little as possible, avoiding affecting the operation of the sensitive circuits inside the host signal processing circuit 12. To ensure the continuity of power supply and signal, the host signal ground terminal GND and the host interface ground terminal PGND are electrically isolated from each other but not completely isolated, so as to be cross-connected through components or devices to avoid a direct electrical connection between the host signal ground terminal GND and the host interface ground terminal PGND.

[0065] In some embodiments, the host interface circuit 13 includes a first isolation circuit 134, and the first isolation circuit 134 is electrically connected between the host signal ground terminal GND and the host interface ground terminal PGND. With such a setting, the first isolation circuit 134 electrically isolates the host signal ground terminal GND from the host interface ground terminal PGND to ensure the continuity of the host communication interface circuit 131 and the host power interface circuit 132 and to prevent them from being interfered by the host interface 133. This electrical isolation means cross-connection isolation through components or devices to avoid direct electrical connection between the host signal ground terminal GND and the host interface ground terminal PGND. In some embodiments, the first isolation circuit 134 may include at least one of a resistor, a capacitor, a magnetic bead, and an inductor. In this embodiment, the first isolation circuit 134 may include a resistor R13 and a capacitor C16 connected in parallel between the host signal ground terminal GND and the host interface ground terminal PGND. The resistor R13 may be a cross-connection resistor between the host signal ground terminal GND and the host interface ground terminal PGND. The capacitor C16 may be a cross-connection capacitor between the host signal ground terminal GND and the host interface ground terminal PGND, and its value ranges from 1 nF to 470 nF. This is not limited in this application.

[0066] In some embodiments, the host power interface circuit 132 includes a host surge protection circuit 135, and the host surge protection circuit 135 is electrically connected between the host power supply terminal 11 and the host interface 133. The host surge protection circuit 135 includes a surge protection device. The surge protection device is connected between the first host power supply terminal DC+ and the second host power supply terminal DC-, and can effectively protect against surges to avoid the coupling interference of the transmission line connected to the host interface 133. The longer the transmission line, the greater the surge. In a building intercom system, for long-distance transmission, the surge from the transmission line is very large. Therefore, the host surge protection circuit 135 is provided to prevent interference and improve the surge protection ability of the host device. In some embodiments, the surge protection device may be one of a transient diode, a varistor, and a gas discharge tube. In this embodiment, the surge protection device may be a transient diode TVS1. The positive electrode of the transient diode TVS1 is electrically connected to the first host power supply terminal DC+, and the negative electrode of the transient diode TVS1 is electrically connected to the second host power supply terminal DC-.

[0067] In some embodiments, the host power interface circuit 132 includes a second isolation circuit 136 electrically connected to the host surge protection circuit 135. The second isolation circuit 136 is electrically connected between the host interface 133 and the host power supply terminal 11, and is also electrically connected between the host surge protection circuit 135 and the host interface 133. The second isolation circuit 136 is used to isolate the communication signals transmitted by the transmission line connected to the host interface 133, prevent the communication signals from affecting the host power supply, and enable the DC power supply to be loaded onto the host power receiving end 122 of the host signal processing circuit 12 without affecting signal communication, thereby preventing the voltage of the host power supply terminal 11 from affecting communication. Connecting the second isolation circuit 136 between the host surge protection circuit 135 and the host interface 133 can provide effective surge protection without increasing the total capacitance of the host interface 133, thus improving the surge protection ability. In some embodiments, the second isolation circuit 136 includes a differential mode inductance circuit, and the differential mode inductance circuit includes a first differential mode inductor L11 and a second differential mode inductor L12. Among them, one end of the first differential mode inductor L11 is electrically connected to the negative electrode of the transient voltage suppressor TVS1, and the other end is electrically connected to the first host connection terminal PLC-P. One end of the second differential mode inductor L12 is electrically connected to the positive electrode of the transient voltage suppressor TVS1, and the other end is electrically connected to the second host connection terminal PLC-N. In this embodiment, the values of the first differential mode inductor L11 and the second differential mode inductor L12 are between 100 uH and 470 uH.

[0068] In some embodiments, the host power interface circuit 132 includes a first filtering circuit 137. The first filtering circuit 137 is electrically connected between the host interface 133 and the host power receiving end 122, and is also electrically connected between the host interface ground terminal PGND and the host signal ground terminal GND. The host power supply terminal 11 is electrically connected between the first filtering circuit 137 and the host interface 133. The first filtering circuit 137 is electrically connected between the host power supply terminal 11 and the host power receiving end 122. The first filtering circuit 137 is used to isolate the host interface ground terminal PGND and the host signal ground terminal GND without affecting the power supply of the host power supply terminal 11 to the host signal processing circuit 12, and can also filter out the interference introduced by the host interface 133. In some embodiments, the first filtering circuit 137 includes at least one of a common mode inductor, a resistor, and a bead. In this embodiment, the first filtering circuit 137 includes a common mode inductor L13, beads R11, and beads R12. Among them, the first end of the common mode inductor L13 is electrically connected to the first host power supply terminal DC+ and the second host power supply terminal DC-. The second end of the common mode inductor L13 is electrically connected to the host power receiving end 122 through the beads R11 and R12. The common mode inductor L13 is used to isolate the host interface ground terminal PGND and the host signal ground terminal GND without affecting the power supply of the host power supply terminal 11 to the host signal processing circuit 12, and can also filter out the interference introduced by the host interface 133. The beads R11 and R12 are similar to inductors. Beads are dedicated to suppressing high-frequency noise and spike interference on signal lines and power lines, and also have the ability to absorb electrostatic pulses. Beads are used to absorb ultra-high frequency signals and are placed at the rear stage of the common mode inductor to filter out high-frequency interference that the common mode inductor cannot filter out. In this way, the interference from the host interface 133 entering the host signal processing circuit 12 through the host power receiving end 122 can be weakened.

[0069] In some embodiments, the host power interface circuit 132 further includes a first DC filtering circuit 138, which is electrically connected between the first filtering circuit 137 and the host surge protection circuit 135, and is also electrically connected between the host power supply terminal 11 and the host surge protection circuit 135. The first DC filtering circuit 138 functions as a filter to improve the filtering function. In some embodiments, the first DC filtering circuit 138 includes at least one capacitor. In this embodiment, the first DC filtering circuit 138 includes capacitors C13, C14, and C15. The capacitors C13, C14, and C15 function as filters. In this embodiment, the capacitance values of the capacitors C13, C14, and C15 are in the range of 1 nF to 10 μF.

[0070] In some embodiments, the host communication interface circuit 131 includes a third isolation circuit electrically connected between the host interface 133 and the host communication terminal 121. In some embodiments, the third isolation circuit includes at least one of a transformer and a capacitor. In this embodiment, the third isolation circuit includes a transformer T11, a capacitor C11, and a capacitor C12. The capacitor C11 and the capacitor C12 are electrically connected between the transformer T11 and the first host connection terminal PLC-P and the second host connection terminal PLC-N, and the transformer T11 is electrically connected between the capacitor C11 and the capacitor C12 and the host communication terminal 121. The capacitor C11 and the capacitor C12 can be DC-blocking capacitors for isolating the DC power supply of a part of the transmission line connected to the host interface 133, enabling AC signals to pass through the capacitor C11 and the capacitor C12 and separating individual communication signals from the signals transmitted through the transmission line. The transformer T11 is placed at the front stage of the capacitor C11 and the capacitor C12 for signal isolation. In this embodiment, the capacitance values of the capacitor C11 and the capacitor C12 are between 100 nF and 2.2 μF.

[0071] In the above solution, by providing the first isolation circuit 134, the host surge protection circuit 135, the second isolation circuit 136, the first filter circuit 137, the first DC filter circuit 138, and the third isolation circuit, the host circuit 10 improves the surge protection, anti-interference, and filtering functions under the condition that the signal transmission distance of the host device is not affected, so as to avoid the host signal processing circuit 12 with as little interference ability as possible entering from the external host interface 133, prevent affecting the operation of the sensitive circuits inside the host signal processing circuit 12, and enhance the signal processing ability of the host signal processing circuit 12.

[0072] In some embodiments, the host device includes a host printed circuit board 14. The host circuit 10 is integrated on the host printed circuit board 14. To avoid signal interference entering from the external host interface 133, the host printed circuit board 14 is improved, thereby avoiding signal interference caused by coupling.

[0073] Figure 2 Shown is a schematic structural diagram of an embodiment of the host printed circuit board 14 of the present application. As Figure 2 shown, the host printed circuit board 14 includes a host signal area 141 and a host interface area 142 that are spaced apart from each other. The host signal processing circuit 12 is disposed in the host signal area 141, and the host interface circuit 13 is disposed in the host interface area 142. With such an arrangement, mutual interference between the host signal processing circuit 12 and the host interface circuit 13 can be avoided, and mutual coupling between the components of the host signal processing circuit 12 and the components of the host interface circuit 13 can be avoided. On the other hand, the separated distribution facilitates wiring and connection.

[0074] In some embodiments, the host printed circuit board 14 includes a multi-layer host circuit board. The multi-layer host circuit board includes at least one host ground plane. The devices of the host signal processing circuit 12 and the devices of the host interface circuit 13 both include connectors, which are plugged and installed on the surface layer or the bottom layer of the multi-layer host circuit board. For example, the processing chip, resistor, capacitor, and inductor can be plug-in components. The host ground plane is generally located in the middle layer between the surface layer and the bottom layer, so as to ensure the return current and facilitate the connection of the devices of the host signal processing circuit 12 and the devices of the host interface circuit 13. The host ground plane is provided with a host signal ground terminal GND and a host interface ground terminal PGND, and a first anti-interference distance is set between the host signal ground terminal GND and the host interface ground terminal PGND on the same layer of the host ground plane, where the first anti-interference distance is not less than 20 mil. With such a setting, when manufacturing the host printed circuit board 14, the host signal ground terminal GND and the host interface ground terminal PGND are laid at intervals, so as to reduce the coupling between the host signal ground terminal GND and the host interface ground terminal PGND, and combine with the first isolation circuit 134 above for isolation, and perform isolation cross-connection in terms of structural layout and circuit connection to ensure the continuity of the host communication interface circuit 131 and the host power interface circuit 132, and improve the stability of the host circuit 10.

[0075] Figure 3 shown as Figure 2 the circuit distribution diagram of the host ground plane 143 of the host printed circuit board 14 shown. As Figure 3 shown, in some embodiments, the host ground plane 143 includes a host signal ground layer 144 serving as the host signal ground terminal GND and a host interface ground layer 145 serving as the host interface ground terminal PGND. The host signal ground layer 144 and the host interface ground layer 145 are arranged separately from each other to avoid coupling when connecting the host signal ground terminal GND or the host interface ground terminal PGND. In some embodiments, the host signal ground layer 144 avoids the orthographic projection area of the first filter circuit 137 on the host ground plane 143. In this embodiment, the first filter circuit 137 includes a common mode inductor L13, a magnetic bead R11, and a magnetic bead R12. The common mode inductor L13, the magnetic bead R11, and the magnetic bead R12 are respectively plugged and installed on the surface layer or the bottom layer of the host printed circuit board 14, and the host signal ground layer 144 on the orthographic projection area of the host ground plane 143 corresponding to the middle layer of the common mode inductor L13, the magnetic bead R11, and the magnetic bead R12 is hollowed out. This hollowing out can be that the host signal ground layer 144 is not provided in this orthographic projection area, or it can be avoided (such as Figure 3As shown in the orthographic projection area A1 in [description], since it is an orthographic projection on the host signal ground layer 144, the orthographic projection area A1 is represented by a dashed box). This can prevent the common-mode inductor L13, the bead R11, and the bead R12 from coupling with the host interface ground terminal PGND on the host signal ground layer 144, avoiding a worse isolation effect, and thus improving the isolation effect. In this embodiment, the inductance value of the common-mode inductor L13 is at least 470 uH.

[0076] In some embodiments, the third isolation circuit includes a transformer T11. The host signal ground layer 144 avoids the orthographic projection area of the transformer on the host ground plate 143. In this embodiment, the transformer T11 is plugged into the surface layer or the bottom layer of the host printed circuit board 14, and the host signal ground layer 144 on the orthographic projection area on the host ground plate 143 corresponding to the middle layer of the transformer T11 is hollowed out. This hollowing out can be that the host signal ground layer 144 is not provided in this orthographic projection area, or it can be avoided (as Figure 3 As shown in the orthographic projection area A2 in [description], since it is an orthographic projection on the host signal ground layer 144, the orthographic projection area A2 is represented by a dashed box). This can prevent the transformer T11 from coupling with the host interface ground terminal PGND on the host signal ground layer 144, avoiding a worse isolation effect, and thus improving the isolation effect.

[0077] In some embodiments, the host interface ground layer 145 avoids the orthographic projection areas of the first host connection terminal PLC-P and the second host connection terminal PLC-N on the host ground plate 143. In this embodiment, the host interface ground layer 145 on the orthographic projection areas on the host ground plate 143 corresponding to the first host connection terminal PLC-P and the second host connection terminal PLC-N is hollowed out. This hollowing out can be that the host interface ground layer 145 is not provided in this orthographic projection area, or it can be avoided (as Figure 3 As shown in the orthographic projection area A3 in [description], since it is an orthographic projection on the host interface ground layer 145, the orthographic projection area A3 is represented by a dashed box). This can prevent the first host connection terminal PLC-P and the second host connection terminal PLC-N from coupling with the host interface ground terminal PGND, avoiding a worse isolation effect, and thus improving the isolation effect.

[0078] It should be noted that in this embodiment, the devices of the host circuit 10 are plugged into the surface layer or the bottom layer of the host circuit board, and the host ground plate 143 is provided in the middle layer between the surface layer and the bottom layer of the host circuit board. Therefore, in Figure 3 only the hollowed-out areas of the host ground plate 143 are marked, and the areas corresponding to the plugged-in devices are not shown, and it is only shown as a schematic diagram, which will not be elaborated here.

[0079] In some embodiments, a second anti-interference distance is provided between the host interface circuit 13 of the host circuit board disposed on the same layer and the host signal ground terminal GND, and the second anti-interference distance is not less than 20 mil. With this setting, when fabricating the host printed circuit board 14, the host interface circuit 13 and the host signal ground terminal GND are laid out at intervals, thereby reducing the coupling between the host interface circuit 13 and the host signal ground terminal GND, and minimizing the transmission from the host interface circuit 13 to the host signal ground terminal GND as much as possible, so as to avoid affecting the operation of the sensitive components in the host signal processing circuit 12 and improve the stability.

[0080] In some embodiments, a third anti-interference distance is provided between the first host connection terminal PLC-P and the second host connection terminal PLC-N and the host signal ground terminal GND and the host interface ground terminal PGND of the host circuit board disposed on the same layer, and the third anti-interference distance is not less than 20 mil. With this setting, when fabricating the host printed circuit board 14, the first host connection terminal PLC-P and the second host connection terminal PLC-N, and the host signal ground terminal GND and the host interface ground terminal PGND are laid out at intervals, thereby reducing the coupling between the first host connection terminal PLC-P and the second host connection terminal PLC-N, and the host signal ground terminal GND and the host interface ground terminal PGND, and minimizing the transmission of external interference signals from the first host connection terminal PLC-P and the second host connection terminal PLC-N to the host signal ground terminal GND as much as possible, so as to improve the isolation performance and stability.

[0081] In some embodiments, an anti-interference distance is provided between the capacitor C11 and the capacitor C12 of the third isolation circuit and the host interface ground terminal PGND of the same layer, and the anti-interference distance is not less than 20 mil. This avoids coupling with the host interface ground terminal PGND and avoids the isolation effect. In some embodiments, the signal portions passing through the capacitor C11 and the capacitor C12 are designed according to differential routing, and the equal length and impedance are controlled in segments, so that the noise effect of the signal can be greatly reduced.

[0082] With this setting, isolation and filtering are performed on the structural layout and circuit connection of the host printed circuit board 14, which can effectively avoid external interference from interfering with the internal operation through the way of common ground coupling without affecting the signal transmission distance, and greatly improve the anti-interference ability of the host circuit 10.

[0083] In Figure 1In the illustrated embodiment, the slave device is connected to the host circuit 10. The host circuit 10 supplies power and communicates with the host circuit 10. The slave circuit 20 includes a slave signal processing circuit 22 and a slave interface circuit 23. Among them, the slave signal processing circuit 22 includes a slave communication terminal 221 and a slave power receiving terminal 222. The slave power receiving terminal 222 includes a power supply terminal and a ground terminal of the slave signal processing circuit 22. The slave interface circuit 23 is electrically connected to the slave communication terminal 221 and the slave power receiving terminal 222. The slave interface circuit 23 includes a slave communication interface circuit 231, a slave power supply interface circuit 232, and a slave interface 233. The slave communication interface circuit 231 is electrically connected to the slave communication terminal 221. The slave power supply interface circuit 232 is electrically connected to the slave power receiving terminal 222. The slave signal processing circuit 22 communicates with the host circuit 10 through the slave communication interface circuit 231 and the slave interface 233. The slave communication interface circuit 231 can be used to isolate the slave communication terminal 221 from the slave interface 233. The slave power supply interface circuit 232 is used to isolate the slave power receiving terminal 222 from the slave interface 233 to improve the anti-interference ability. The slave interface 233 includes a first slave wiring terminal PLC-P and a second slave wiring terminal PLC-N. Both the slave communication interface circuit 231 and the slave power supply interface circuit 232 are electrically connected to the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N. The first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N are used to be electrically connected to the host device of the building intercom system through a transmission line (not shown). The slave communication terminal 221 is connected to the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N through the slave communication interface circuit 231. The slave communication terminal 221 includes two terminals for transmitting differential signals, which are respectively connected to the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N. The slave communication interface circuit 231 and the slave power supply interface circuit 232 are electrically connected to the host device of the building intercom system through a common transmission line, which can realize the transmission of the communication signal and the power signal of the slave device, reduce wiring, and has a simple structure, being safe and reliable.

[0084] In some embodiments, the slave power receiving terminal 222 includes a slave signal power supply terminal VCC2 and a slave signal ground terminal GND. The slave signal power supply terminal can serve as the power supply terminal of the slave communication processing circuit 21. The slave signal ground terminal GND can serve as the ground terminal of the slave communication processing circuit 21. The slave power supply interface circuit 232 includes a slave interface ground terminal PGND, and the slave signal ground terminal GND is electrically isolated from the slave interface ground terminal PGND. Since the external slave interface 233 is the main source of electromagnetic interference, the slave communication processing circuit 21 is separated from the slave interface circuit 23, so that the interference energy entering from the external slave interface 233 has as little impact on the slave communication processing circuit 21 as possible, avoiding affecting the operation of the sensitive circuits inside the slave communication processing circuit 21. To ensure continuous power supply and signal, the electrical isolation between the slave signal ground terminal GND and the slave interface ground terminal PGND is not complete isolation, and can be bridged through components or devices to avoid direct electrical connection between the slave signal ground terminal GND and the slave interface ground terminal PGND.

[0085] In some embodiments, the slave interface circuit 23 includes a fourth isolation circuit 234, and the fourth isolation circuit 234 is electrically connected between the slave signal ground terminal GND and the slave interface ground terminal PGND.

[0086] With such a setting, the fourth isolation circuit 234 is used to electrically isolate the slave signal ground terminal GND from the slave interface ground terminal PGND to ensure the continuity of the slave communication interface circuit 231 and the slave power supply interface circuit 232 and to be free from the interference of the slave interface 233. This electrical isolation refers to bridging isolation through components or devices to avoid direct electrical connection between the slave signal ground terminal GND and the slave interface ground terminal PGND. In some embodiments, the fourth isolation circuit 234 includes at least one of a resistor, a capacitor, a magnetic bead, and an inductor. In this embodiment, the fourth isolation circuit 234 can include a resistor R23 and a capacitor C26 connected in parallel between the slave signal ground terminal GND and the slave interface ground terminal PGND. The resistor R23 can be a bridging resistor between the slave signal ground terminal GND and the slave interface ground terminal PGND. The capacitor C26 can be a bridging capacitor between the slave signal ground terminal GND and the slave interface ground terminal PGND, and its value ranges from 2 nF to 470 nF. This is not limited in this application.

[0087] In some embodiments, the slave power interface circuit 232 includes a slave surge protection circuit 235, and the slave surge protection circuit 235 is electrically connected between the slave power receiving end 222 and the slave interface 233. The slave surge protection circuit 235 includes a surge protection device, which can effectively protect against surges to avoid the coupling interference of the transmission line connected to the slave interface 233. The longer the transmission line, the greater the surge. In the building intercom system, for long-distance transmission, the surge from the transmission line is very large. Therefore, the slave surge protection circuit 235 is provided to prevent interference and improve the surge protection ability of the slave device. In some embodiments, the surge protection device can be one of a transient diode, a varistor, and a gas discharge tube. In this embodiment, the surge protection device can be the transient diode TVS2. The positive electrode of the transient diode TVS2 is electrically connected to the slave signal ground terminal GND, and the negative electrode of the transient diode TVS2 is electrically connected to the slave interface ground terminal PGND.

[0088] In some embodiments, the slave power interface circuit 232 includes a fifth isolation circuit 236 electrically connected to the slave surge protection circuit 235. The fifth isolation circuit 236 is electrically connected between the slave interface 233 and the slave power receiving end 222, and is also electrically connected between the slave surge protection circuit 235 and the slave interface 233. The fifth isolation circuit 236 is used to isolate the communication signal transmitted by the transmission line connected to the slave interface 233, prevent the influence of the communication signal on the power supply of the slave, and enable the DC power supply to be loaded onto the slave power receiving end 222 of the slave communication interface circuit 231 without affecting signal communication, thereby preventing the influence of voltage on communication. Connecting the fifth isolation circuit 236 between the slave surge protection circuit 235 and the slave interface 233 can effectively protect against surges without increasing the total capacitance of the slave interface 233, and improve the surge protection ability. In some embodiments, the fifth isolation circuit 236 includes a common-mode choke circuit, and the common-mode choke circuit includes a third common-mode choke L21 and a fourth common-mode choke L22. Among them, one end of the third common-mode choke L21 is electrically connected to the negative electrode of the transient diode TVS2, and the other end is electrically connected to the first slave wiring terminal PLC-P. One end of the fourth common-mode choke L22 is electrically connected to the positive electrode of the transient diode TVS2, and the other end is electrically connected to the second slave wiring terminal PLC-N. In this embodiment, the values of the third common-mode choke L21 and the fourth common-mode choke L22 are between 100 uH and 470 uH.

[0089] In some embodiments, the slave power interface circuit 232 includes a second filter circuit 237, which is electrically connected between the slave interface 233 and the slave power receiving end 222, and is also electrically connected between the slave interface ground terminal PGND and the slave signal ground terminal GND. The second filter circuit 237 can be used to isolate the slave interface ground terminal PGND and the slave signal ground terminal GND, and can also filter out the interference introduced by the slave interface 233. In some embodiments, the second filter circuit 237 includes at least one of a common mode inductor, a resistor, and a bead. In this embodiment, the second filter circuit 237 includes a common mode inductor L23, a bead R21, and a bead R22. Among them, the first end of the common mode inductor L23 is electrically connected to the negative and positive poles of the slave surge protection circuit 235, and the second end of the common mode inductor L23 is electrically connected to the slave power receiving end 222 through the bead R21 and the bead R22. The common mode inductor L23 is used to isolate the slave interface ground terminal PGND and the slave signal ground terminal GND without affecting the power supply from the slave power receiving end 222 to the slave communication end 221, and can also filter out the interference introduced by the slave interface 233. The beads R21 and R22 are similar to inductors. Beads are dedicated to suppressing high-frequency noise and spike interference on signal lines and power lines, and also have the ability to absorb electrostatic pulses. Beads are used to absorb ultra-high frequency signals and are placed at the rear stage of the common mode inductor to filter out high-frequency interference that cannot be filtered by the common mode inductor. In this way, the interference introduced by the slave interface 233 entering the slave communication end 221 through the slave power receiving end 222 can be weakened.

[0090] In some embodiments, the slave power interface circuit 232 further includes a second DC filter circuit 238, which is electrically connected between the second filter circuit 237 and the slave surge protection circuit 235. The second DC filter circuit 238 functions as a filter to improve the filtering function. In some embodiments, the second DC filter circuit 238 includes at least one capacitor. In this embodiment, the second DC filter circuit 238 includes capacitors C23, C24, and C25. The capacitors C23, C24, and C25 function as filters. In this embodiment, the capacitance values of the capacitors C23, C24, and C25 are in the range of 1 nF to 10 uF. In some embodiments, the slave power interface circuit 232 further includes a rectifier bridge 239, which is electrically connected between the slave surge protection circuit 235 and the fifth isolation circuit 236. This arrangement avoids the transmission line connected to the slave interface 233 from affecting the polarity of the slave power interface circuit 232.

[0091] In some embodiments, the slave communication interface circuit 231 includes a sixth isolation circuit electrically connected between the slave interface 233 and the slave communication terminal 221. In some embodiments, the sixth isolation circuit includes at least one of a transformer and a capacitor. In this embodiment, the sixth isolation circuit includes a transformer T21, a capacitor C21, and a capacitor C22. The capacitor C21 and the capacitor C22 are electrically connected between the transformer T21 and the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N, and the transformer T21 is electrically connected between the capacitor C21 and the capacitor C22 and the slave communication terminal 221. The capacitor C21 and the capacitor C22 can be DC-blocking capacitors for isolating the DC power supply of a part of the transmission line connected to the slave interface 233, enabling AC signals to pass through the capacitor C21 and the capacitor C22 and separating individual communication signals from the signals transmitted through the transmission line. The transformer T21 is placed at the front stage of the capacitor C21 and the capacitor C22 for signal isolation. In this embodiment, the capacitance values of the capacitor C21 and the capacitor C22 are between 100 nF and 2.2 μF.

[0092] In some embodiments, the slave device includes a slave printed circuit board 24, and the slave circuit 20 is integrated on the slave printed circuit board 24. To avoid interference from signals entering through the external slave interface 233, the slave printed circuit board 24 is improved, thereby avoiding signal interference due to coupling.

[0093] Figure 4 The following shows a schematic structural diagram of an embodiment of the slave printed circuit board 24 of the present application. As Figure 4 shown, the slave printed circuit board 24 includes a slave signal area 241 and a slave interface area 242 that are spaced apart from each other. The slave signal processing circuit 22 is provided in the slave signal area 241, and the slave interface circuit 23 is provided in the slave interface area 242. With this arrangement, interference between the slave signal processing circuit 22 and the slave interface circuit 23 can be avoided, and coupling between the components of the slave signal processing circuit 22 and the slave interface circuit 23 can be avoided. On the other hand, the separated distribution facilitates wiring and connection.

[0094] In some embodiments, the slave printed circuit board 24 includes a multi-layer slave circuit board, and the multi-layer slave circuit board includes at least one slave ground plane. The devices of the slave signal processing circuit 22 and the devices of the slave interface circuit 23 both include connectors, which are plugged and installed on the surface layer or the bottom layer of the multi-layer slave circuit board. For example, the processing chip, resistor, capacitor, and inductor can be plug-in components. The slave ground plane is generally located in the middle layer between the surface layer and the bottom layer, so as to ensure the return current and facilitate the connection of the devices of the slave signal processing circuit 22 and the devices of the slave interface circuit 23. The slave ground plane is provided with a slave signal ground terminal GND and a slave interface ground terminal PGND. A fourth anti-interference distance is set between the slave signal ground terminal GND and the slave interface ground terminal PGND on the same layer of the slave ground plane, and the fourth anti-interference distance is not less than 20 mil. With such a setting, when manufacturing the slave printed circuit board 24, the slave signal ground terminal GND and the slave interface ground terminal PGND are laid at intervals, so as to reduce the coupling between the slave signal ground terminal GND and the slave interface ground terminal PGND, and combine with the fourth isolation circuit 234 above for isolation, and perform isolation cross-connection in terms of structural layout and circuit connection to ensure the continuity of the slave communication interface circuit 231 and the slave power interface circuit 232, and improve the stability of the slave circuit 20.

[0095] Figure 5 Shown as Figure 4 The circuit distribution diagram of the slave ground plane 243 of the slave printed circuit board 24 shown in the figure. As Figure 5 shown, in some embodiments, the slave ground plane 243 includes a slave signal ground layer as the slave signal ground terminal and a slave interface ground layer 245 as the slave interface ground terminal PGND. The slave signal ground layer and the slave interface ground layer 245 are arranged separately from each other to avoid coupling when connecting the slave signal ground terminal GND or the slave interface ground terminal PGND. In some embodiments, the slave signal ground layer avoids the orthographic projection area of the second filter circuit 237 on the slave ground plane 243. In this embodiment, the second filter circuit 237 includes a common mode inductor L23, a magnetic bead R21, and a magnetic bead R22. The common mode inductor L23, the magnetic bead R21, and the magnetic bead R22 are respectively plugged and installed on the surface layer or the bottom layer of the slave printed circuit board 24. For example, the processing chip, resistor, capacitor, and inductor can be the slave signal ground layer on the orthographic projection area of the middle layer corresponding to the common mode inductor L23, the magnetic bead R21, and the magnetic bead R22 on the slave ground plane 243 is hollowed out. This hollowing out can be that there is no slave signal ground layer in this orthographic projection area, or it can be avoided (such as Figure 5As shown by the orthographic projection area A4 in [reference], since it is an orthographic projection on the slave signal ground layer 244, the orthographic projection area A4 is represented by a dashed box). In this way, it can prevent the common-mode inductor L23, the bead R21, and the bead R22 from being coupled to the slave interface ground terminal PGND on the slave signal ground layer, avoiding a worse isolation effect, and thus improving the isolation effect. In this embodiment, the inductance value of the common-mode inductor L23 is at least 470 uH.

[0096] In some embodiments, the sixth isolation circuit includes a transformer T21. The slave signal ground layer avoids the orthographic projection area of the transformer T21 on the slave ground plate 243. In this embodiment, the transformer T21 is plugged into the surface layer or the bottom layer of the slave printed circuit board 24, and the slave signal ground layer on the orthographic projection area of the slave ground plate 243 corresponding to the middle layer of the transformer T21 is hollowed out. This hollowing out can be that there is no slave signal ground layer in this orthographic projection area, or it can be avoided (as Figure 5 As shown by the orthographic projection area A5 in [reference], since it is an orthographic projection on the slave signal ground layer 244, the orthographic projection area A5 is represented by a dashed box). In this way, it can prevent the transformer T21 from being coupled to the slave interface ground terminal PGND on the slave signal ground layer, avoiding a worse isolation effect, and thus improving the isolation effect.

[0097] In some embodiments, the slave interface ground layer 245 avoids the orthographic projection areas of the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N on the slave ground plate 243. In this embodiment, the slave interface ground layer 245 on the orthographic projection areas of the slave ground plate 243 corresponding to the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N is hollowed out. This hollowing out can be that there is no slave interface ground layer 245 in this orthographic projection area, or it can be avoided (as Figure 5 As shown by the orthographic projection area A6 in [reference], since it is an orthographic projection on the slave interface ground layer 245, the orthographic projection area A6 is represented by a dashed box). In this way, it can prevent the first slave wiring terminal PLC-P and the second slave wiring terminal PLC-N from being coupled to the slave interface ground terminal PGND, avoiding a worse isolation effect, and thus improving the isolation effect.

[0098] It should be noted that in this embodiment, the devices of the slave circuit 20 are plugged into the surface layer or the bottom layer of the slave circuit board, and the slave ground plate 243 is arranged in the middle layer between the surface layer and the bottom layer of the slave circuit board. Therefore, in Figure 5 [reference], only the hollowed-out area of the slave ground plate 243 is marked, and the areas corresponding to the plugged-in devices are not shown, and it is only shown as a schematic diagram, which will not be elaborated here.

[0099] In some embodiments, a fifth anti-interference distance is provided between the slave interface circuit 23 of the slave circuit board disposed on the same layer and the slave signal ground terminal GND, and the fifth anti-interference distance is not less than 20 mil. With such a setting, when manufacturing the slave printed circuit board 24, the slave interface circuit 23 and the slave signal ground terminal GND are laid at intervals, thereby reducing the coupling between the slave interface circuit 23 and the slave signal ground terminal GND, and minimizing the transmission from the slave interface circuit 23 to the slave signal ground terminal GND as much as possible, so as to avoid affecting the operation of the sensitive components in the slave signal processing circuit 22 and improve the stability.

[0100] In some embodiments, a sixth anti-interference distance is provided between the first slave connection terminal PLC-P and the second slave connection terminal PLC-N and the slave signal ground terminal GND and the slave interface ground terminal PGND of the slave circuit board disposed on the same layer, and the sixth anti-interference distance is not less than 20 mil. With such a setting, when manufacturing the slave printed circuit board 24, the first slave connection terminal PLC-P and the second slave connection terminal PLC-N, and the slave signal ground terminal GND and the slave interface ground terminal PGND are laid at intervals, thereby reducing the coupling between the first slave connection terminal PLC-P and the second slave connection terminal PLC-N, and the slave signal ground terminal GND and the slave interface ground terminal PGND, and minimizing the transmission of external interference signals from the first slave connection terminal PLC-P and the second slave connection terminal PLC-N to the slave signal ground terminal GND as much as possible, improving the isolation performance and stability.

[0101] In some embodiments, an anti-interference distance is provided between the capacitor C21 and the capacitor C22 of the third isolation circuit and the slave interface ground terminal PGND of the same layer, and the anti-interference distance is not less than 20 mil. This avoids coupling with the slave interface ground terminal PGND and avoids the isolation effect. In some embodiments, the signal portions passing through the capacitor C21 and the capacitor C22 are designed according to differential routing, and the equal length and impedance are controlled in segments, so that the noise effect of the signal can be greatly reduced.

[0102] With such a setting, isolation and filtering are performed on the structural layout and circuit connection of the slave printed circuit board 24, which can effectively avoid external interference from interfering with the internal operation through the way of common ground coupling without affecting the signal transmission distance, and greatly improve the anti-interference ability of the slave circuit 20.

[0103] It should be noted that Figure 1 and Figure 2 the host device shown in the embodiment can be used in cooperation with other slave devices, or can be used in cooperation with Figure 1 and Figure 3 other devices shown in the embodiment. Similarly, Figure 1 and Figure 3The slave device shown in the embodiment can be used in cooperation with other master devices, or can also be used in cooperation with Figure 1 and Figure 2 the master device shown in the embodiment. The above-mentioned master device and slave device are not only applied to the building intercom system, but can also be applied to electronic devices for long-distance transmission, which are not limited in this application. The application scenario is not restricted, and the applicable range is wider.

[0104] After considering the specification and practicing the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. This application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0105] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A main unit device of a building intercom system, characterized in that, The host device includes a host circuit, and the host circuit includes: A host power supply terminal for receiving a supply voltage; A host signal processing circuit including a host communication terminal and a host power receiving terminal, and the host power receiving terminal is electrically connected to the host power supply terminal; A host interface circuit electrically connected to the host communication terminal, the host power receiving terminal, and the host power supply terminal; the host interface circuit includes a host communication interface circuit, a host power interface circuit, and a host interface. The host communication interface circuit is electrically connected to the host communication terminal, the host power interface circuit is electrically connected to the host power receiving terminal and the host power supply terminal, the host interface includes a first host connection terminal and a second host connection terminal, and both the host communication interface circuit and the host power interface circuit are electrically connected to the first host connection terminal and the second host connection terminal. The first host connection terminal and the second host connection terminal are used to be electrically connected to a slave device of the building intercom system through a transmission line; Wherein, the host power interface circuit includes a host surge protection circuit, and the host surge protection circuit is electrically connected between the host power supply terminal and the host interface; and / or The host power interface circuit includes a host surge protection circuit and a second isolation circuit electrically connected to the host surge protection circuit. The second isolation circuit is electrically connected between the host interface and the host power supply terminal, and is also electrically connected between the host surge protection circuit and the host interface.

2. The host device according to claim 1, characterized in that, The host power supply terminal includes a first host power supply terminal and a second host power supply terminal. The host power receiving terminal includes a host signal power supply terminal electrically connected to the first host power supply terminal, and a host signal ground terminal electrically connected to the second host power supply terminal. The host power interface circuit includes a host interface ground terminal electrically connected to the second host power supply terminal, and the host signal ground terminal and the host interface ground terminal are electrically isolated from each other.

3. The host device according to claim 2, wherein The host interface circuit includes a first isolation circuit, and the first isolation circuit is electrically connected between the host signal ground terminal and the host interface ground terminal.

4. The host device according to claim 2, characterized in that, The host power interface circuit includes a first filter circuit, and the first filter circuit is electrically connected between the host interface and the host power receiving terminal, and is also electrically connected between the host interface ground terminal and the host signal ground terminal. The host power supply terminal is electrically connected between the first filter circuit and the host interface.

5. The host device according to claim 1, characterized in that, The host communication interface circuit includes a third isolation circuit, and the third isolation circuit is electrically connected between the host interface and the host communication terminal.

6. The host device according to claim 1, characterized in that, The host device includes a host printed circuit board, the host circuit is integrated on the host printed circuit board, and the host printed circuit board includes a host signal area and a host interface area which are arranged separately from each other. The host signal processing circuit is arranged in the host signal area, and the host interface circuit is arranged in the host interface area.

7. The host device according to claim 6, wherein The host power receiving end includes a host signal grounding end, and the host interface circuit includes a host interface grounding end; the host printed circuit board includes multiple layers of host circuit boards, and the multiple layers of host circuit boards include at least one host grounding board; the host grounding board is provided with the host signal grounding end and the host interface grounding end, and a first anti-interference distance is set between the host signal grounding end and the host interface grounding end on the same layer of the host grounding board, where the first anti-interference distance is not less than 20 mil.

8. The host device according to claim 7, characterized in that, The host grounding board includes a host signal grounding layer serving as the host signal grounding end and a host interface grounding layer serving as the host interface grounding end; The host power interface circuit includes a first filtering circuit, the first filtering circuit is electrically connected between the host interface and the host power receiving end, and is electrically connected between the host interface grounding end and the host signal grounding end, and the host power supply end is electrically connected between the first filtering circuit and the host interface; the host signal grounding layer avoids the orthographic projection area of the first filtering circuit on the host grounding board; and / or The host communication interface circuit includes a third isolation circuit, the third isolation circuit is electrically connected between the host interface and the host communication end; the third isolation circuit includes a transformer; the host signal grounding layer avoids the orthographic projection area of the transformer on the host grounding board; and / or The host interface grounding layer avoids the orthographic projection areas of the first host connection terminal and the second host connection terminal on the host grounding board.

9. The host device according to claim 6, characterized in that, The host printed circuit board includes multiple layers of host circuit boards; A second anti-interference distance is set between the host interface circuit and the host signal grounding end on the same layer of the host circuit board, and the second anti-interference distance is not less than 20 mil; and / or A third anti-interference distance is set between the first host connection terminal and the second host connection terminal and the host signal grounding end and the host interface grounding end on the same layer of the host circuit board, where the third anti-interference distance is not less than 20 mil.

10. A slave device of a building intercom system, characterized in that, The slave device includes a slave circuit, and the slave circuit includes: A slave signal processing circuit, including a slave communication end and a slave power receiving end; A slave interface circuit, electrically connected to the slave communication end and the slave power receiving end; the slave interface circuit includes a slave communication interface circuit, a slave power interface circuit, and a slave interface, the slave communication interface circuit is electrically connected to the slave communication end, the slave power interface circuit is electrically connected to the slave power receiving end, the slave interface includes a first slave connection terminal and a second slave connection terminal, both the slave communication interface circuit and the slave power interface circuit are electrically connected to the first slave connection terminal and the second slave connection terminal, and the first slave connection terminal and the second slave connection terminal are used to be electrically connected to the host device of the building intercom system through a transmission line; Wherein, the slave power interface circuit includes a slave anti-surge circuit, and the slave anti-surge circuit is electrically connected between the slave power receiving end and the slave interface; and / or The slave power interface circuit includes a slave surge protection circuit and a fifth isolation circuit electrically connected to the slave surge protection circuit. The fifth isolation circuit is electrically connected between the slave interface and the slave power receiving end, and is also electrically connected between the slave surge protection circuit and the slave interface.

11. The slave device according to claim 10, characterized in that, The slave power receiving end includes a slave signal power supply terminal and a slave signal ground terminal. The slave power interface circuit includes a slave interface ground terminal, and the slave signal ground terminal is electrically isolated from the slave interface ground terminal.

12. The slave device according to claim 11, wherein The slave interface circuit includes a fourth isolation circuit, which is electrically connected between the slave signal ground terminal and the slave interface ground terminal.

13. The slave device according to claim 11, characterized in that, The slave power interface circuit includes a second filtering circuit, which is electrically connected between the slave interface and the slave power receiving end, and is also electrically connected between the slave interface ground terminal and the slave signal ground terminal.

14. The slave device according to claim 10, characterized in that, The slave communication interface circuit includes a sixth isolation circuit, which is electrically connected between the slave interface and the slave communication end.

15. The slave device according to claim 10, characterized in that, The slave device includes a slave printed circuit board, and the slave circuits are integrated on the slave printed circuit board. The slave printed circuit board includes a slave signal area and a slave interface area that are spaced apart from each other. The slave signal processing circuit is disposed in the slave signal area, and the slave interface circuit is disposed in the slave interface area.

16. The slave device according to claim 15, characterized in that, The slave power receiving end includes a slave signal ground terminal, and the slave interface circuit includes a slave interface ground terminal. The slave printed circuit board includes multiple layers of slave circuit boards, and the multiple layers of slave circuit boards include at least one layer of slave ground plane. The slave ground plane is provided with the slave signal ground terminal and the slave interface ground terminal, and a fourth anti-interference distance is set between the slave signal ground terminal and the slave interface ground terminal on the same layer of the slave ground plane, where the fourth anti-interference distance is not less than 20 mil.

17. The slave device according to claim 16, wherein The slave ground plane includes a slave signal ground layer serving as the slave signal ground terminal and a slave interface ground layer serving as the slave interface ground terminal. The slave power interface circuit includes a second filtering circuit, which is electrically connected between the slave interface and the slave power receiving end, and is also electrically connected between the slave interface ground terminal and the slave signal ground terminal. The slave signal ground layer avoids the orthographic projection area of the second filtering circuit on the slave ground plane; and / or The slave communication interface circuit includes a sixth isolation circuit, which is electrically connected between the slave interface and the slave communication end. The sixth isolation circuit includes a transformer. The slave signal ground layer avoids the orthographic projection area of the transformer on the slave ground plane; and / or The slave interface ground layer avoids the orthographic projection areas of the first slave connection terminal and the second slave connection terminal on the slave ground plane.

18. The slave device according to claim 15, characterized in that, The slave power receiving end includes a slave signal ground terminal, and the slave interface circuit includes a slave interface ground terminal. The slave printed circuit board includes multiple layers of slave circuit boards. A fifth anti-interference distance is provided between the slave interface circuit of the slave circuit board on the same layer and the slave signal ground terminal, and the fifth anti-interference distance is not less than 20 mil; and / or A sixth anti-interference distance is provided between the first slave connection terminal and the second slave connection terminal and the slave signal ground terminal and the slave interface ground terminal of the slave circuit board on the same layer, wherein the sixth anti-interference distance is not less than 20 mil.

19. A building intercom system, characterized in that, Comprising: The host device according to any one of claims 1 to 9 above; and The slave device according to any one of claims 10 to 18 above, and the slave device is electrically connected to the host device through a transmission line.

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