RF interface protection circuit
By using metal shielding cover and series isolation capacitors in RF RF interface circuits, the problem of breakdown of isolation capacitors caused by leakage is solved, reducing fire risk and improving equipment safety and circuit performance, ensuring the stability of signal transmission .
Patent Information
- Application Number
- CN202420004614.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-02
AI Technical Summary
In use scenarios, existing RF RF interface circuits are prone to breakdown and burning of isolation capacitors due to leakage, which poses a fire hazard, and cannot completely avoid the breakdown of isolation capacitors, affecting the safety of equipment.
Design an RF RF interface protection circuit, by installing a metal shield on the motherboard of the communication equipment, and connecting at least a set of isolation capacitors in series between the outer ground of the RF RF interface and the ground of the motherboard, the signal line is connected to the radio frequency input circuit, The isolation capacitor is composed of the first and second isolation capacitors in series, and are both arranged in a metal shield to ensure isolation protection and signal transmission.
It effectively reduces the fire risk caused by breakdown of isolation capacitors, improves the safety of communication equipment and overall circuit performance, and does not affect the sensitivity of RF radio frequency signals. It is simple to design, low cost and easy to achieve.
Smart Images
Figure CN222338702U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of RF radio frequency interface, in particular to an RF radio frequency interface protection circuit. Background Art
[0002] The rapid development of communication technology has not only promoted the development of society and economy, but also brought more convenience and possibilities to people's lives. At the same time, more and more types of electronic communication equipment have entered thousands of households, and RF radio frequency interfaces that use analog electrical signals to transmit audio and video information are widely used in various electronic communication equipment. Its safety and reliability have become key parameters for users and indicators that R&D and design need to focus on improving.
[0003] At present, with the advancement of technology and space saving for PCB layout, the RF interface circuit protection used in communication equipment mainly uses chip capacitors to achieve isolation protection, isolating the impact current introduced by the RF interface due to the unequal potential between the outer ground and the motherboard ground. However, in actual use scenarios, the isolation capacitor may have individual quality problems, or leakage in the user's home, and the leakage voltage is relatively large or the time is relatively long. Due to the above two reasons, the internal resistance of the capacitor decreases after long-term use, and leakage and heat are generated over a long period of time. In addition, commonly used household electronic communication equipment is usually stacked on other high-temperature bodies such as televisions or placed in small spaces that are easy to heat up, such as inside TV cabinets, etc., which causes the capacitor to be broken down or even burn components. Even if the board and the shell are made of flame-retardant materials, there is still a large fire hazard. At present, it is impossible to completely avoid the situation where the isolation capacitor is broken down. It is necessary to minimize the risk of burning components and equipment due to capacitor breakdown. At the same time, it is necessary to reduce the risk of equipment burning after the isolation capacitor is broken down without interfering with the sensitivity of the RF radio frequency signal and the simplicity of circuit design. Utility Model Content
[0004] The utility model aims to provide an RF radio frequency interface protection circuit, which is used to solve the problem in the prior art that leakage may cause isolation capacitors to be broken down or even burn components in the use scenario of communication equipment.
[0005] The utility model solves the above problems through the following technical solutions:
[0006] A RF radio frequency interface protection circuit comprises: a communication device mainboard, an RF radio frequency interface arranged on the communication device mainboard, a metal shielding cover and a radio frequency input circuit electrically connected to the RF radio frequency interface; the RF radio frequency interface and the metal shielding cover are an integrated structure, the metal shielding cover is fixedly mounted on the communication device mainboard, and at least one group of isolation capacitors is connected in series between the outer layer ground of the RF radio frequency interface and the mainboard ground of the communication device mainboard.
[0007] Furthermore, the RF radio frequency interface is electrically connected to the radio frequency input circuit, including: the RF radio frequency interface is connected to the radio frequency input circuit via a signal line, and a group of isolation capacitors are connected in series on the signal line.
[0008] Furthermore, the signal line, the radio frequency input circuit and the isolation capacitor are all arranged in the metal shielding cover.
[0009] Furthermore, each group of isolation capacitors is composed of a first isolation capacitor and a second isolation capacitor connected in series.
[0010] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0011] (1) The utility model realizes isolation protection for the outer ground of the RF interface by connecting at least one group of isolation capacitors in series between the outer ground of the RF interface and the mainboard ground of the mainboard of the communication device. At the same time, the RF interface is connected to the RF input circuit through a signal line connected in series with a group of isolation capacitors, thereby realizing isolation protection for the RF input circuit.
[0012] (2) The metal shielding cover is welded on the mainboard of the communication equipment, which plays the role of isolating the air in a nearly airtight space and isolating it from other components. Each group of isolation capacitors is composed of a first isolation capacitor and a second isolation capacitor connected in series, which effectively reduces the risk of fire caused by the breakdown of the isolation capacitor. For a large number of communication equipment used indoors, the safety of use is greatly improved.
[0013] (3) The design of adding isolation capacitors in the utility model will not affect the sensitivity of RF radio frequency signals, will not interfere with the normal use of communication equipment, and improves the overall performance of the circuit. At the same time, the circuit design is simple and has the advantages of being easy to implement, low cost, and good effect in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the utility model.
[0015] Among them, 1-RF radio frequency interface; 2-communication equipment main board; 3-metal shielding cover; 11-outer ground; 12-signal line; 13-RF input circuit; 21-main board ground. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.
[0017] In the following description, the terms "first\second\third" and the like are only used to distinguish similar objects and do not represent a specific order for the objects. It is understandable that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.
[0018] Example:
[0019] Combined with Figure 1 As shown, an RF radio frequency interface protection circuit includes: a communication device mainboard 2, an RF radio frequency interface 1 arranged on the communication device mainboard 2, a metal shielding cover 3 and a radio frequency input circuit 13 electrically connected to the RF radio frequency interface 1; the RF radio frequency interface 1 and the metal shielding cover 3 are an integrated structure, the metal shielding cover 3 is fixedly installed on the communication device mainboard 2, and at least one group of isolation capacitors is connected in series between the outer layer ground 11 of the RF radio frequency interface 1 and the mainboard ground 21 of the communication device mainboard 2.
[0020] The outer ground 11 of the RF interface 1 generally refers to the grounding point to which the metal part of the device casing or chassis is connected. In the present application, the outer ground 11 of the RF interface 1 refers to the external metal shell or shielding layer of the RF interface 1. The motherboard ground 21 is the common grounding point connecting various circuits inside the communication device; the metal shielding cover 3 is welded on the communication device motherboard 2; the number and parameters of the isolation capacitors need to be determined according to specific design requirements and system specifications.
[0021] The RF interface 1 is electrically connected to the RF input circuit 13 , including: the RF interface 1 is connected to the RF input circuit 13 via a signal line 12 , and a group of isolation capacitors are connected in series to the signal line 12 .
[0022] The signal line 12 is the signal line 12 of the RF radio frequency interface 1, which is a specially designed radio frequency signal line to meet the needs of high-frequency signal transmission, such as: coaxial cable (coaxial cable), microstrip line (microstrip), embedded microstrip line (embedded microstrip), waveguide (waveguide), etc. They have low transmission loss, good impedance matching characteristics and anti-interference ability, and are suitable for high-frequency radio frequency signal transmission.
[0023] The signal line 12 , the radio frequency input circuit 13 and the isolation capacitor are all arranged in the metal shielding cover 3 .
[0024] Each isolation capacitor group is composed of a first isolation capacitor C1 and a second isolation capacitor C2 connected in series.
[0025] It should be noted that the first isolation capacitor C1 and the second isolation capacitor C2 are both high-voltage capacitors, and the selection and use of high-voltage capacitors depend on actual work requirements; when one high-voltage capacitor in a group of isolation capacitors is broken down and short-circuited, there is still another high-voltage capacitor that plays a protective role in isolating the outer ground 11 of the RF radio frequency interface 1 from the mainboard ground 21, reducing the risk of burning components and communication equipment due to capacitor breakdown, and greatly improving the safety of use.
[0026] When an accident occurs where one of the isolation capacitors in a group is broken down, another isolation capacitor in the group still functions normally to protect the device from burning. The probability of a group of isolation capacitors being completely broken down and damaged is very small, so this design greatly reduces the risk of fires caused by capacitor breakdown due to accidents. At the same time, considering the more extreme case where a group of isolation capacitors are completely damaged and burn, the metal shielding cover 3 is welded on the communication device motherboard 2, which acts as a nearly airtight space to isolate the air and separate it from other components, thereby reducing the risk of fire.
[0027] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.
Claims
1. An RF radio frequency interface protection circuit, characterized in that: include: A communication device mainboard, an RF radio frequency interface provided on the communication device mainboard, a metal shielding cover, and a radio frequency input circuit electrically connected to the RF radio frequency interface; The RF radio frequency interface and the metal shielding cover are an integrated structure, the metal shielding cover is fixedly mounted on the communication device mainboard, and at least one group of isolation capacitors is connected in series between the outer layer ground of the RF radio frequency interface and the mainboard ground of the communication device mainboard.
2. The RF interface protection circuit according to claim 1, characterized in that: The RF radio frequency interface is electrically connected to the radio frequency input circuit, including: the RF radio frequency interface is connected to the radio frequency input circuit via a signal line, and a group of isolation capacitors are connected in series on the signal line.
3. The RF interface protection circuit according to claim 2, characterized in that: The signal line, radio frequency input circuit and isolation capacitor are all arranged in the metal shielding cover.
4. The RF interface protection circuit according to any one of claims 1 to 3, characterized in that: Each isolation capacitor group is composed of a first isolation capacitor and a second isolation capacitor connected in series.