50results about How to "EMI suppression" patented technology

The application belongs to the field of vehicle-mounted refrigerators, and discloses a dual-temperature cooperative acquisition circuit, an intelligent temperature measurement method and a vehicle-mounted refrigerator, which comprise: a synchronous acquisition unit, which is used for synchronously acquiring temperature signals of at least two target regions of the vehicle-mounted refrigerator and outputting corresponding temperature analog signals; an anti-interference processing unit, which is connected with the output end of the synchronous acquisition unit and is used for filtering various interference signals in the vehicle-mounted environment; an adaptive signal conditioning unit, which is connected with the output end of the anti-interference processing unit and is used for adaptively amplifying, filtering and linearizing the temperature analog signals; a main control unit, which is connected with the output end of the adaptive signal conditioning unit and is used for digitizing the temperature signals, performing algorithm operation and logical control; and a wide-adaptive power supply unit, which is connected with the synchronous acquisition unit, the anti-interference processing unit, the adaptive signal conditioning unit and the main control unit and is used for providing a stable working voltage that is adapted to the vehicle-mounted power supply.

The application relates to the technical field of LED circuit, in particular to a lamp color adjusting circuit with a thyristor light modulation module, which comprises a rectifier circuit, a multi-grade dial code color adjusting circuit, a frequency flash removing circuit, a thyristor current discharge circuit and a constant current light modulation circuit. The rectifier circuit converts an alternating current power supply into a direct current voltage to supply power to a circuit system. The multi-grade dial code color adjusting circuit adjusts the current distribution of LED lamp beads through a dial code switch and a second group of resistors, generates a color adjusting signal, carries out low-pass filtering and dynamic compensation on the color adjusting signal, and outputs a pure control signal to the thyristor current discharge circuit. The thyristor current discharge circuit adjusts a current path according to the control signal to provide a smooth and adaptive power supply for the constant current light modulation circuit. The constant current light modulation circuit realizes constant current output. The design significantly reduces the hardware cost and the complexity of the circuit system, effectively suppresses electromagnetic interference in combination with the low-frequency modulation characteristics of the thyristor, and realizes the balance between light modulation precision and the stability of the circuit system.

The utility model discloses a novel new energy automobile charging wire, including conductor layer, heat dissipation layer and insulating layer, the conductor layer is by the flattening of the flattening structure of the stranding of multiple annealed soft copper filaments, the heat dissipation layer is covered in the conductor layer outside, by silica gel BN composite material injection moulding, its inside is equipped with the micro -fine ventilation pipeline of through, the insulating layer is located the heat dissipation layer outside, the insulating layer includes inner shielding layer and outer protective layer. The utility model discloses scientific and reasonable structure design, through the flattening structure of conductor layer, compared with traditional circular structure increases the heat dissipation area, solves the problem that the inside of car is narrow because of the section of traditional charging wire and leads to the wiring difficulty of narrow space, the problem of heavy weight, through the inner shielding layer of insulating layer adopts aluminium foil mella composite layer, inhibits the electromagnetic interference of charging wire work, solves the electromagnetic compatibility problem of high -power charging wire.

The invention relates to the field of position sensors, in particular to a linear position sensor. The device comprises a shell and a support connected to the shell. The middle of the support is provided with a PCB, the bottom is provided with a magnet and a chip, and the top is provided with a metal terminal. The middle of the magnet is hollowed out, and a groove is formed in one side of the magnet for mounting the sensing unit of the chip; the chip is connected with one end of the PCB; and the metal terminal is connected with the other end of the PCB. Through collaborative innovation of a magnetic circuit, a circuit and a mechanical structure, comprehensive performance improvement of high precision, high reliability, strong anti-interference capability and wide environment adaptability is realized.

The utility model discloses a printed circuit board and an electronic product, and relates to the field of printed circuit boards, the printed circuit board comprises a first daughter board, the first daughter board is provided with a shielding hole and a signal hole which are coaxially distributed, the diameter of the signal hole is smaller than that of the shielding hole, so that an annular gap is formed between the shielding hole and the signal hole, and the first daughter board is provided with a second daughter board; a shielding filling layer and a first electroplated layer in contact with the shielding filling layer are arranged in the annular gap; the sintering layers are arranged on the upper end face and the lower end face of the first daughter board and used for achieving interconnection with the adjacent daughter boards. The double functions of electromagnetic shielding and signal transmission are achieved, the interconnection efficiency of the multilayer circuit board is effectively improved, the production cycle is shortened, the time and cost in a traditional layer-by-layer stacking process are effectively reduced, and the yield and production efficiency of products are improved.

This utility model relates to the field of rectifier and filter circuits, and more particularly to an AC input rectifier and filter circuit, including a rectifier bridge, a transformer, an anti-interference module, and an overvoltage protection module. A second safety Y capacitor CY2 and a third safety Y capacitor CY3 are connected in series. The third safety Y capacitor CY3 is connected to the N terminal of the mains power supply, and the second safety Y capacitor CY2 is connected to the L terminal of the mains power supply. The overvoltage protection module includes a varistor MOV1. The positive input terminal of a common-mode inductor L1 is connected to the L terminal of the mains power supply. The positive and negative output terminals of the common-mode inductor L1 are connected to the input terminals of the rectifier bridge, respectively. The positive output terminal of the rectifier bridge is connected to the positive terminal of a storage capacitor C3, and the negative output terminal of the rectifier bridge is connected to the negative terminal of the storage capacitor C3. The positive terminal of the storage capacitor C3 is connected to the transformer, and the transformer outputs 12V. This circuit enhances the anti-interference capability of the circuit by optimizing the design of the rectifier and filter circuit; at the same time, the introduction of overvoltage protection components such as a varistor improves the overvoltage protection capability of the circuit.

This utility model discloses a multi-joint motor drive module for a bionic robot, comprising a bionic robot body, five drive units, and a main control chip. The bionic robot body has at least one waist joint and four leg joints, each equipped with a motor. The five drive units are respectively connected to the motors at the waist joint and the four leg joints. Each drive unit has a control signal interface and a power output interface. The main control chip is disposed within the bionic robot body and is used to output multiple control signals to coordinate the movement of the motors at each joint. The control signal interface is electrically connected to the control pins of the main control chip and is used to receive forward rotation, reverse rotation, stop, and braking commands. The power output interface is electrically connected to the motors at the corresponding joints to drive the motors. This utility model aims to achieve flexible joint movement and posture adjustment in bionic robots.

The utility model discloses a high -voltage connector convenient to installation, including socket assembly and plug assembly, socket assembly is connected with plug assembly. The utility model has the beneficial effects: the utility model can realize multi -angle installation through rotating plug assembly, breaks through the restriction of traditional connector only 90 or 180 cooperation mode, and the selection range of installation position is greatly expanded, and whole car wiring becomes more convenient, the utility model adopts 360 shielding structure of shielding spring, shielding outer ring and shielding inner ring, effectively avoids the problem of shielding layer loosening, fracture, and electromagnetic interference is effectively inhibited, and the stability of system signal transmission is improved, the utility model discloses through interlocking sealing washer, socket sealing pad, plug sealing washer, small O -ring, sleeve and big O -ring etc.

The application discloses an aviation piston engine redundant ignition system with an electromagnetic shielding function and an ignition method, and particularly relates to the field of engines. The system comprises a first control module and a second control module, two control modules are connected with two ignition coils through high-voltage damping lines, each ignition coil is connected with a spark plug mechanism through a high-voltage damping line, two spark plug mechanisms are arranged on a cylinder of the engine, the high-voltage damping line is coated with a shielding layer, and the spark plug mechanism is correspondingly sleeved with a shielding shell. Based on the system, redundant ignition control is adopted, two control modules are used, each control module can control two independent ignition systems at the same time, electric energy is released to two ignition coils at the same time, ignition control is performed, and electromagnetic interference can be effectively inhibited.

The application relates to a flexible charging module control method and device supporting V2G, comprising the following steps: determining whether there is a hard switching risk according to the comparison result of the load power value and the preset threshold value; in the case that there is a hard switching risk, adjusting the resonant frequency of the CLLL topology to the first frequency interval based on a frequency-duty cycle hybrid modulation strategy, making the resonant current phase and the switch tube voltage phase form a preset phase difference, and adjusting the drive signal duty cycle of the primary side switch tube and the secondary side switch tube, so that the conduction time difference of the primary side switch tube and the secondary side switch tube increases with the decrease of the load power value; based on an adaptive frequency spectrum expansion algorithm, the resonant frequency is periodically dithered in the first frequency interval with a preset step, and the dithering period and the switching period of the switch tube are in a nonlinear mapping relationship; the bidirectional power conversion efficiency is improved, the light load hard switching and electromagnetic interference problems are solved, and the reliable operation of the charging module in the V2G scene is ensured.

The utility model discloses a common mode inductor integrated signal distribution wire harness for a security and protection system, which comprises a signal distribution wire harness which is at least provided with a group of wire harness mounting structures. According to the utility model, the wiring harness mounting structure is mounted on the wiring harness, so that the wiring harness connected to the security equipment can be fixed, the influence of loosening and falling on the connection of the security equipment is avoided, and the wiring harness can be fixed through movement by arranging the arc-shaped clamping plates which are symmetrical up and down; the arc-shaped clamping plates can move only by rotating the rotary knobs through a tool, compared with a comparison file in the background technology, the arc-shaped clamping plates are more stable, not prone to loosening and falling off and better in practical effect, the shielding layer and the common mode inductor module are used for restraining external electromagnetic interference, and the shielding layer is made of a metal woven mesh material. High-frequency electromagnetic interference can be effectively shielded, and the stability and anti-interference capability of signal transmission are improved.

This invention relates to the field of switching power supply technology, specifically providing an isolated power supply circuit aimed at solving the problems of low integration, poor output consistency, and high cost and energy consumption in existing multi-channel isolated power supplies. To this end, the invention comprises: a power control and drive module, an isolation module, a rectification, filtering, and voltage regulation module, an anti-interference module, and a load module. The power control and drive module receives power, generates a drive voltage signal, and outputs the drive voltage signal to the isolation module, while simultaneously outputting a ground potential voltage signal to the anti-interference module. The isolation module achieves voltage signal isolation output through internal electromagnetic coupling, outputting the isolated voltage signal to the rectification and filtering module. The anti-interference module outputs the filtered, interference-free ground potential voltage signal to the rectification and filtering module. The rectification and filtering module performs rectification and filtering processes, outputting a stable voltage signal to the load module. This invention features high integration and high output consistency.

The utility model relates to an anti-pad structure for optimizing a PCB high-speed via hole, which comprises a via hole pile, the via hole pile penetrates through a multi-layer PCB, and two ends of the via hole pile are respectively connected with differential signal pair wires; the combined elliptical anti-bonding pads are distributed at the wire inlet and the wire outlet of the via hole pile and are composed of a large elliptical bonding pad and a small elliptical bonding pad which are tangent, the long axis length of the large ellipse is D1, the short axis length of the large ellipse is d1, the long axis length of the small ellipse is D2, and the short axis length of the small ellipse is d2; the single circle anti-bonding pad is arranged in the copper column area of the via hole pile, the diameter of the single circle anti-bonding pad is d3, and d3 is larger than the diameter d0 of the via hole and smaller than d1. According to the anti-bonding pad structure for optimizing the PCB high-speed via hole, the combined elliptical anti-bonding pad realizes impedance gradual change from differential routing to a copper column area by means of a specific size proportion, and signal reflection at the two ends of a via hole pile is reduced; a single circle anti-bonding pad optimizes impedance in a copper column area and is matched with a U-shaped shunting groove to shield electromagnetic interference, and meanwhile, a diversion groove is communicated with the U-shaped shunting groove to form a three-stage backflow path, so that crosstalk is reduced.

The application discloses a kind of high-voltage motor fault prediction method and system, to solve the problem that prior art cannot carry out high sensitivity early warning to weak, progressive early fault under the premise of not relying on fault sample.The method comprises: synchronously collecting three-phase current, three-axis vibration and stator temperature signal;Based on historical normal data, train multivariate LSTM-VAE prediction model;Real-time calculation multidimensional residual vector;Residual covariance matrix is calculated in sliding window;Generate anomaly score by structural similarity with reference covariance matrix;When anomaly score is continuously over threshold, trigger early warning.The system comprises multi-source sensor array, synchronous acquisition module, prediction model, residual calculation module, covariance analysis module and early warning decision module.The application realizes early fault high robustness early warning when signal amplitude is not over limit by monitoring multivariate residual covariance structure evolution, significantly improves predictive maintenance efficiency.

The invention discloses a welding penetration control method and system based on LabView, and relates to the technical field of welding process control. The method comprises the steps that a welding voltage signal in the welding process is collected; a LabView processor is used for conducting data format conversion, noise reduction processing and frequency domain analysis on the welding voltage signals, and the oscillation frequency of a molten pool is extracted; the oscillation frequency of the molten pool is compared with the critical penetration frequency in an expert database, and the penetration state of the current welding process is judged; and the welding system and / or the motion control system are / is controlled to execute corresponding control actions according to the judgment result, so that welding heat input is adjusted, and closed-loop control over the penetration state is achieved. The noise reduction treatment adopts a self-adaptive multi-scale correlation weighted generalized threshold wavelet noise reduction method, and the oscillation frequency of the molten pool is obtained through peak group proportion analysis. According to the method, online recognition and real-time regulation and control of the welding penetration state can be achieved, and the method has the advantages of being high in anti-interference capacity, stable in feature extraction and high in control precision.

The utility model discloses a kind of metal grid shielding cases of anti-static interference's LCD display screen, it is related to LCD display screen technical field, and it includes: metal cover and the metal grid being set in the inside of metal cover, the rear surface of the metal cover is provided with shielding case, and the rear surface of the metal cover is provided with electromagnetic shielding film in the front of shielding case, the outside of the metal cover is also installed with ground plate, the front surface of the metal cover and the rear surface of shielding case are coated with antistatic coating. By installing shielding case on the rear surface of metal cover to increase its thickness, which can effectively improve the shielding ability of electromagnetic interference, and using ground plate can transmit static electricity to the ground through the conductor, avoid static electricity affecting the work of LCD display screen, by setting electromagnetic shielding film between metal cover and shielding case, which effectively suppresses electromagnetic interference and static interference, thereby improving display effect and the stability of equipment.

The utility model discloses a fireproof pre-branch cable with a metal sheath, which comprises a main cable and at least one branch cable, and a fireproof branch joint is arranged at the joint of the main cable and the branch cable. Each of the main cable and the branch cable comprises a conductor, a main insulating layer, a metal sheath layer, a fireproof layer and an outer sheath which are sequentially arranged from inside to outside; the fireproof branch joint comprises a metal sleeve sleeved outside a connecting part, so that the safety is improved, the sealing failure caused by thermal expansion and cold contraction of a traditional joint is avoided, and the fire resistance of the joint is ensured to be consistent with that of the cable body.

The utility model relates to a composite structure anti-rotation steel wire rope for deep-sea exploration, which belongs to the technical field of steel wire ropes for deep-sea exploration and comprises a rope core layer, and a protective reinforcing structure is arranged on the outer wall of the rope core layer. The protective reinforcing structure comprises a steel wire layer pressed on the outer wall of the rope core layer, the outer wall of the steel wire layer is pressed with a composite structure layer, the outer wall of the composite structure layer is pressed with a buffer energy-absorbing layer, the outer wall of the buffer energy-absorbing layer is pressed with a reinforcing structure layer, and the outer wall of the reinforcing structure layer is pressed with a conductive shielding layer. And the outer wall of the conductive shielding layer is covered with a polymer coating protection layer in a pressing manner. According to the composite structure anti-rotation steel wire rope for deep sea exploration, according to the multi-layer composite structure design, the rope core layer provides a supporting and lubricating foundation, the steel wire layer bears main loads, the composite structure layer achieves the anti-rotation function, the buffering energy absorption layer effectively absorbs impact and vibration, and the reinforcing structure layer further improves the overall strength and stability; the conductive shielding layer inhibits electromagnetic interference.

This utility model relates to the field of connector technology, specifically to a sensor connector with a shielded structure, including a male terminal and a female terminal, which mate with each other. The male terminal has an internal reinforcing connection mechanism, which includes an extension post fixedly connected to the end of the male terminal away from the female terminal. The male terminal has a first insertion groove inside, and a reinforcing block is inserted into the extension post. A sealing gasket is fixedly connected to the outer wall of the reinforcing block and is also fixedly connected to the inside of the extension post. This utility model enhances the mechanical connection strength between the male and female terminals through the cooperation of the male terminal and the reinforcing connection mechanism, ensuring stable contact even under vibration, preventing loosening or disconnection. The sealing gasket design provides an adaptive seal, and the linkage mechanism of the compression block, connecting rod, contact head, and lifting block automatically clamps the terminal wires during insertion.

The utility model discloses an attitude and heading reference system, relates to the technical field of attitude and heading monitoring, and aims to provide an attitude and heading reference system with high precision, high performance and cost effectiveness, which comprises a power chip set, an acceleration sensor, a plurality of six-axis sensors, a magnetic sensor, a communication chip, a singlechip and a CAN (controller area network) conversion component, the CAN conversion assembly comprises a CAN controller and a CAN transceiver, the CAN controller is used for receiving a signal sent by the single chip microcomputer and transmitting the signal to the CAN transceiver, and the CAN transceiver is used for converting a digital signal output by the CAN controller into a physical signal required by a CAN bus. According to the invention, electromagnetic interference received in the transmission process is suppressed, noise on the CAN bus is reduced, electrical isolation can be provided, and the stability and accuracy of data transmission are further improved.

The invention discloses a valve mechanism in-place detection system for an open switch cabinet, and relates to the technical field of switch cabinet valves, the valve mechanism in-place detection system comprises a substrate, the bottom end of the substrate is connected with a mounting track, and the left and right sides of the substrate are both provided with guide rods; a valve mechanism is jointly arranged on the outer side of the upper contact and the outer side of the lower contact, a connecting rod is arranged on the rear side of the base plate, an encoder shaft is movably connected to the outer surface of the connecting rod, an encoder is connected to the other end of the encoder shaft, and a PLC control module is connected to the outer surface of the encoder through an electric wire. Hall sensors are arranged on the outer sides of the two guide rods, and magnetic marks are preset on the outer surfaces of the two guide rods. A series of structures are arranged, multi-sensor redundancy check is utilized, the false alarm rate is reduced, high precision and reliability are improved, the self-adaptive algorithm is compatible with different conditions, manual intervention is reduced, meanwhile, misoperation is effectively prevented through a real-time interlocking mechanism, and electric power safety specifications are met.

The invention relates to the technical field of modular avionics cases, and discloses a modular electronic rack for a complex airborne environment, a module bearing area and a printed board backboard bearing area are of embedded structures, and the joints of side plates on the two sides of the module bearing area and transverse cold plates adopt mutually matched mortise and tenon joint structures. A plurality of modules can be installed and jointly inserted on the printed board backboard in a blind mode to achieve interconnection, and the electronic rack has the capacity of adapting to strong vibration, high temperature, high humidity and heat and salt mist of a carrier and being high in shielding performance due to the fact that the electronic rack is made of sealing pieces and corrosion-resistant materials.

This application discloses a multi-vehicle positioning device for intelligent driving testing, relating to the technical field of intelligent driving testing. The device includes a fixed base station installed at the test site, and master vehicle positioning components and slave vehicle positioning components installed on master and slave test vehicles. The fixed base station receives satellite signals and provides position references for the test vehicles. The slave vehicle positioning components feed back slave vehicle position information to the master vehicle positioning components, and the master vehicle positioning components feed back the master and slave vehicle position information to a host computer. Both master and slave vehicle positioning components are equipped with an automatic power switching module, which connects to a main power supply and a backup power supply. This module automatically switches to the backup power supply when the main power supply fails, ensuring stable power supply. The technical solution in this application can automatically switch power during testing, avoiding data transmission interruptions caused by power outages, reducing testing risks and uncertainties, and meeting the requirement for continuous positioning during intelligent driving testing.

The utility model provides an integrated data acquisition and control module. The integrated data acquisition and control module comprises a circuit board and a shell for accommodating the circuit board, the circuit board is divided into a central area and a peripheral area surrounding the central area, the core control unit is arranged in the central area, and the power supply unit, the communication unit and the signal input and output unit are arranged in the peripheral area; the circuit board is a multi-layer circuit board and comprises a digital signal processing layer, an analog signal processing layer, a power supply layer and a grounding layer, wherein the power supply layer and the grounding layer are arranged between the digital signal processing layer and the analog signal processing layer. According to the utility model, through combination of a specific plane layout and a three-dimensional layered structure, digital signals and analog signals are physically isolated and electrically shielded, signal crosstalk under a high-density layout is fundamentally inhibited, the anti-interference performance and the operation stability of the module are improved, and the module is suitable for severe industrial environments such as rail transit and the like.

The utility model provides a kind of integrated stealth water column antenna, through the integration design of shell, water pump assembly, ground net plate and signal transmission component, significantly reduce antenna volume and promote stealth performance, shell columnar structure inlaying injection channel and isolation magnetic ring, realize the physical isolation of radio frequency signal and seawater, avoid the radar scattering problem caused by exposed metal parts of traditional shipborne antenna;Water pump assembly is directly connected with the lower side of shell, and forms radiator by injecting seawater, and after communication, pump can be stopped to realize antenna invisibility, signal transmission component and ground net plate are horizontally arranged on the upper end surface of shell, form compact plane layout, ground net plate arranged on the upper end surface of shell floats in sea level during use, only makes nozzle part above sea level, greatly enhances stealth performance, avoids the technical problem that water column antenna in the prior art is only applicable to ship platform use, use scene has great limitation, cannot meet the stealth demand.

The utility model discloses a modularization probe card, including substrate and adapter plate, substrate one end is provided with test machine lead line row and inserts one end, and the other end is provided with detection window, and is equipped with the pad area around detection window for welding blade probe and probe lead-out wire, the adapter plate detachably installed between test machine lead line row and inserts one end and pad area, be equipped with wiring network on the substrate, and the input of wiring network is electrically connected with test machine lead line row and inserts one end, and the output is connected to pad area through adapter plate. The substrate is designed as general bottom plate, and is equipped with detachable adapter plate and is adapted to different sample test, and high-precision probe card need not to be customized, meanwhile, the adapter plate adopts foolproof interface design, prevents the circuit abnormality caused by mistake.

The application discloses an electromagnetic protection device for a car engine signal line, characterized in that the electromagnetic protection device comprises an engine signal protection circuit and a protection shell; wherein the engine signal protection circuit comprises a gas discharge tube, a transient voltage suppression diode and a filter circuit; the gas discharge tube is arranged at the front end of the engine signal protection circuit and is used for primary energy discharge; the transient voltage suppression diode is arranged at the middle section of the engine signal protection circuit and is used for fast response and voltage limiting protection; and the filter circuit is distributed at the middle section and the rear end of the engine signal protection circuit and is used for high-frequency interference suppression. The electromagnetic safety of the engine signal line can be comprehensively ensured, the reliability and stability of the vehicle control system are improved, and the maintenance cost is reduced.

The invention belongs to the technical field of power transmission wires, and discloses a bending-resistant anti-cracking bundled insulated wire and a preparation method thereof. According to the invention, the conductor adopts a stepped unequal-diameter stranded structure, and in cooperation with in-situ annealing treatment, the flexibility and fatigue resistance of the conductor are improved; the insulating layer adopts a sandwich gradient composite structure, so that the inner layer is soft, the middle layer is tough, the outer layer is wear-resistant, bending stress can be effectively dispersed, and cracking of the insulating layer is avoided; and the protection layer and the insulation layer are mechanically interlocked through the micro ribs and the grooves, and the bonding effect of the identification layer is combined, so that the interlayer bonding is tight, the stripping phenomenon is avoided, and the bending resistance is further improved. The wire is good in overall flexibility, facilitates wiring and bending in complex scenes, improves the construction efficiency, has excellent high and low temperature resistance and aging resistance, can be widely applied to scenes needing frequent bending and complex wiring such as building interior lines, new energy equipment and mobile electrical equipment, and is high in practicability.

This invention belongs to the field of musical instruments, specifically relating to a loudspeaker capable of eliminating electromagnetic interference, an elimination method, and an electronic musical instrument. The loudspeaker capable of eliminating electromagnetic interference includes: a sounding diaphragm; at least two sets of driving components, each driving component including a cooperating magnetic circuit system and a voice coil, the voice coil being fixed to the sounding diaphragm and used to generate an alternating magnetic field under the drive of an electrical driving signal; wherein the at least two driving components are configured such that, when an electrical driving signal is input, the total magnetic flux change of the alternating magnetic fields generated by each driving component at the target element cancels each other out, and the driving force generated by each driving component on the sounding diaphragm is in the same direction. This invention eliminates interference by having at least two sets of driving components jointly drive the same sounding diaphragm, causing the alternating magnetic fields generated by each component to cancel each other out at the target element, while simultaneously ensuring that the driving forces on the diaphragm are superimposed in the same direction for normal sound production.

The application discloses a low-smoke halogen-free flame-retardant fire-resistant branch cable and relates to the technical field of branch cables.The low-smoke halogen-free flame-retardant fire-resistant branch cable comprises two cable bodies and an insulating block, a protection mechanism is arranged between the two cable bodies, the protection mechanism comprises a double-hole frame, a main protection shell and an auxiliary protection shell, two housings are fixed to the surface of the main protection shell, and a plug rod is fixed to penetrate the inner surface of the double-hole frame. The protection mechanism can protect the "Y-shaped branch" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable, avoid the deformation or breakage of the joint due to the accidental falling of building materials, the collision of tools, the misoperation and pulling of construction personnel and the extrusion of other objects, ensure the normal power supply of the cable, promote the smooth progress of construction, and improve the use effect of the low-smoke halogen-free flame-retardant fire-resistant branch cable.