2808 results about "Electromagnetic compatibility" patented technology

A method and a system for self-regulating wireless power transmitted to a wireless power receiver (WPR) are provided. An auto-tuning network is operably coupled within the WPR. The auto-tuning network includes an impedance network that dynamically increases, decreases, or maintains an amount of the received wirelessly transmitted power by detecting changes in a rectifier load disposed in the WPR and / or in a rectifier output voltage in the WPR. The auto-tuning network self-regulates the wireless power received from a wireless power transmitter (WPT) obviating the need for conventional communication messages. The WPT is hence free from a modulator / demodulator block and an out-of-band communication block and operates over a limited operating range to enable a simpler design for passing electromagnetic compliance regulations. The WPR implements a receiver-maximum-power-signature algorithm for enabling the WPT to detect unsupported receivers, configure its operating point and range, and terminate power transmission when not needed by the WPR.

A self adjusting RF assembly including an RF radiator is disclosed. The RF assembly includes at least one component that may be replaced by a user of the RF assembly. The RF assembly includes an identification element associated with the at least one component for representing at least one characteristic of the component. The RF assembly includes a monitoring element for monitoring the identification element at least during power up of the RF assembly. The RF assembly also includes an adjusting element for adjusting radiation from the RF radiator wherein the adjusting element is operably associated with the monitoring element to maintain radiation from the RF radiator below a preset limit. The preset limit is typically determined by local electromagnetic compatibility (EMC) regulations. A method for maintaining radiation from an RF assembly below a preset limit is also disclosed.

Five circuit synthesis methods, for forming new power conversion circuits with enhanced electromagnetic compatibility and improved AC performance from old circuits with AC performance and / or electromagnetic compatibility deficiencies, are revealed. The new synthesis methods achieve performance improvements without requiring the addition of magnetic cores. In all cases a simple toroidal magnetic core structure is not precluded. In all cases splitting or adding magnetic windings is required, and, in many cases, additional capacitors are required. Many new circuits formed by applying the synthesis methods are revealed. The results achieved by application of the synthesis methods include zero ripple current at all terminals without adding magnetic cores or requiring a complex magnetic circuit element, cancellation of common mode currents, improved control loop bandwidth, and faster transient response.

Improved electromagnetic compatibility for integrated motherboard or device board designs is provided by magnetic shielding, electric shielding, or both integrated into the chip packaging materials. Motherboard emissions may be reduced by use of the shielding. A nonconductive primary and tertiary layer sandwich a high-conductivity metal secondary layer forming a Faraday cage for electric field shielding. A nonconductive primary layer is covered by a tertiary layer formed of a composite having permeable material for magnetic shielding. The tertiary layer formed of a composite could include a high permeability particulate ferrous material. Both the secondary layer and the tertiary layer formed of a composite could be used for both electric and magnetic shielding of chips.

A wireless local area network adapted for use by users traveling on a mobile platform such as an aircraft. The network includes a network server located on the mobile platform, and at least one network access point connected to the server and accessible wirelessly by at least one user portable electronic device over one of a plurality of non-overlapping network frequency channels. The RF characteristics of this wireless network are specifically tailored to meet applicable standards for electromagnetic compatibility with aircraft systems and RF exposure levels for passengers and flight crews.

Improved electromagnetic compatibility for integrated motherboard or device board designs is provided by magnetic shielding, electric shielding, or both integrated into the chip packaging materials. Motherboard emissions may be reduced by use of the shielding. A nonconductive primary and tertiary layer sandwich a high-conductivity metal secondary layer forming a Faraday cage for electric field shielding. A nonconductive primary layer is covered by a tertiary layer formed of a composite having permeable material for magnetic shielding. The tertiary layer formed of a composite could include a high permeability particulate ferrous material. Both the secondary layer and the tertiary layer formed of a composite could be used for both electric and magnetic shielding of chips.

The invention provides a method for testing electro-magnetic compatibility of an automotive CAN (controller area network) bus based on semi-physical simulation, belonging to the technical field of design and development of electro-magnetic compatibility of an automobile. The method comprises the following steps: step 1. building an automotive empty shell table frame of which the full size is 1:1 according to the actual situation of the electro-magnetic compatibility of the automobile; step 2. simulating and injecting the interference signals; step 3. monitoring the response of the automotive CAN bus on the interference signals; step 4. estimating the EMC (electro-magnetic compatibility) property of the CAN bus by using an estimating system; and step 5. observing the electro-magnetic compatibility of the automotive CAN bus in real time. With the adoption of the method, the shortcoming of the traditional method for testing the electro-magnetic compatibility of the automotive CAN bus is made up. Based on a forecasting platform of the semi-physical simulation of the electro-magnetic compatibility, research staff can implement the electro-magnetic compatibility design at various development stages such as the scheme formulating, sample manufacturing, sample testing, and testing of the system, so that the problems that the traditional electro-magnetic compatibility design is not complete and the electro-magnetic compatibility rectification has no effect can be solved.

The invention provides a primary side-controlled constant current switch power supply controller and a primary side-controlled constant current switch power supply control method. The controller comprises a current sampling end, a grounded end, a power supply end, a driving end, a voltage feedback end, a frequency setting end, a first sampling hold module, an average current ring module, a saw-tooth wave generation module, a comparison module, a second sampling hold module, a voltage / frequency conversion module, a driving pulse generation module and a driving module. The controller has a simple structure and can be used for realizing a high-power factor within a full-input voltage range while constant current is output; in addition, when output voltage is unchanged, work frequency of the circuit is basically constant, so that the work frequency meets the electromagnetic compatible standard more easily. The primary side-controlled constant current switch power supply controller and theprimary side-controlled constant current switch power supply control method can also be used for a direct-current input low-power power supply without requirement on a power factor so as to realize constant current output.

The invention discloses a wave energy and solar energy driven unmanned monitoring ship for a marine environment, which comprises a ship body and an unmanned control system, wherein the ship body has a shape of rigid inflatable boat; the unmanned control system comprises a ground remote control system and a ship-loaded system which are coupled with each other through a wireless data link; the ground remote control system comprises a remote control computer, a wireless network bridge and corresponding top-layer application software; the ground remote control system is used for receiving, analyzing and displaying a ground remote control command and data; a serial port of the remote control computer is connected to the wireless network bridge; and the ship-loaded system comprises a navigationcontrol subsystem, a communication subsystem, a navigation information sensing and collecting subsystem, a wave energy and solar energy power generating and supplying subsystem and a data collecting subsystem. No diesel motor is required in the wave energy and solar energy driven unmanned monitoring ship, a wave energy generating system and a solar energy generating device of the ship are directly used for supplying power, the quality of output electric energy is stable and the electromagnetic compatibility is excellent, thereby ensuring the normal work of ship-loaded equipment under a complex marine environment.

A latch for a Compact PCI board, which incorporates inject and eject and engage and disengage functions, has a low profile shape, whereof a fold-down handle operates through a total arc of 90 degrees. Enhanced electromagnetic compatibility (EMC) is provided, by more efficient EMC shielding and by reduced electromagnetic force (EMF) radiation pass-through. The latch, in its inject / eject operation, undergoes a two-phase motion, which utilizes a rotary motion to insert / extract the board from electrical connection, and utilizes a linear motion to engage / disengage the latch pawl from the chassis (keeper). A separate alignment pin block, normally carrying a lead guide pin and a seating guide pin, is independent of the structure for the base of the latch. This permits the alignment pin block to be mounted to the inside of the faceplate and the latch to be mounted to the outside of the faceplate. By so doing, the cumulative (aggregate) area of the opening(s) through the faceplate is reduced, which thereby increases the EMC (electromagnetic compatibility) of the design by reducing EMF radiation pass-through.

A power supply for a Light Emitting Diode (LED) traffic signal that controls the light intensity. The light intensity conforms to a predetermined pattern based on the input voltage root mean square value (Vrms). The input voltage is changed by acting on the amplitude of the sine wave or by using a triac and controlling the angle of fire. The power supply comprises a fuse module, an electromagnetic compatibility filter module, a power supply module, a LED load module, a current monitor module, a RMS-DC conversion module and a fuse blow out module.

The invention discloses a fuel cell vehicle multi-source controller and a control method thereof. The fuel cell vehicle multi-source controller functionally comprises communication among a fuel cell engine controller, a vehicle controller and a vehicle intelligent control system; the fuel cell vehicle multi-source controller achieves interaction and control of input information between a fuel cellstack, a cell stack operation monitoring device, a cell stack operation environment control device, a controller body, an upper computer, a fuel cell system and the whole vehicle and the outside. Thefuel cell vehicle multi-source controller and the control method thereof solve the problems that the fuel cell engine controller and the vehicle controller of an existing fuel cell vehicle are independently designed and operated in software and hardware to impede resource integration, to result in resource waste as well as difficulty in cost reduction, to go against comprehensive demand design offunctional safety, electromagnetic compatibility, safety redundancy and intelligent control on chips and systems and to increase the system risk.

The invention discloses a symmetrical half-bridge LLC resonant bidirectional DC-DC converter, which belongs to the technical field of power electronic application. Topological structures on the two sides of the converter are symmetrical, and adopted components adopt a complex function design. When a switching network and a resonant network on one side of a high frequency transformer function, the switching network and the resonant network on the other side are automatically evolved into a rectifier-load network, and the networks on the two sides commonly form the whole LLC resonant converter to realize power conversion in a corresponding direction. Because the structures are completely symmetrical, reverse conversion can be possible; and in the reverse conversion, the topological structures can be automatically reconstructed to form a reverse LLC resonant converter to realize reverse power conversion. The symmetrical half-bridge LLC resonant bidirectional DC-DC converter achieves effective improvements in conversion efficiency, power density, dynamic performance and electromagnetic compatibility, reduces the electrical stress of components at work, has a reduced volume and a reduced weight, and realizes highly-efficient, isolated and bidirectional DC / DC power conversion.

he invention discloses a mixed excitation biconvex pole motor, including rotors, stators, three-phase armature windings and a case, wherein, the case is in magnetic conduction material, the rotor is composed of alveolar type core lamination, the stator fixed in the case includes 'U'-shaped cores arranged with interval between each other and permanent magnets provided between the 'U'-shaped cores and the case, the first permanent magnet charges magnetism tangentially along the circumference, N pole and S pole are arranged alternately, a second permanent magnet is provided between the 'U'-shaped core base and the case, the second permanent magnet charges magnetism along the radius direction, N pole and S pole are arranged alternately, the three phase armature winding is a concentrated winding, winding on the armature teeth, the armature teeth are composed of adjacent two edges of two 'U'-shaped cores, the single-phase excitation is a concentrated winding, winding on the 'U'-shaped core and the permanent magnet. In the inventive mixed excitation biconvex pole motor, the permanent magnet excitation and exciter winding electric excitation jointly combine an air-gap field to realize the adjustability of air-gap field, and simultaneously adopts magnetic conduction material as the case so that it can avoid the leakage of case outer edge, improves the motor anti-electromagnetic interference and electromagnetic compatibility, and improves utilization of permanent magnets.

A semiconductor package has a die connected to a substrate with a transfer molding applied over the die. The transfer molding includes an electrically conductive material for forming an electromagnetic compatibility shield as an integral part thereof.

A radio frequency module with a SAW package mounted on the substrate is provided in a low profile structure also having excellent resistance to noise or in other words, electromagnetic compatibility even when a resin-sealed SAW package is utilized. Organic laminate of at least a single layer is used as the substrate of the radio frequency module, and a throughhole is formed on that organic laminate. The resin-sealed SAW package that encloses a flip-chip mounted SAW filter is mounted so that the ceramic substrate is positioned mainly outside the throughhole, and the SAW filter is positioned mainly inside the throughhole. A grounding conductor is formed on the rear side or the inner layer in the vicinity of the throughhole.

The invention presents a structure for the conversion of direct current electric power into alternating current electric power, characterised in that it is simple, highly efficient and minimises the problem of electromagnetic compatibility. The circuit includes, in its first preferred embodiment, six switching elements governed by a command unit, four switches forming an H-bridge (T1, T2, T3, T4) and two auxiliary switches (T5D, T6D), and two auxiliary diodes (Daux1 and Daux2). The elements of the H-bridge switch at grid frequency, whereas T5D and T6D switch at high frequency by means of pulse width modulation (PWM), or other appropriate modulation techniques. The voltage of these auxiliary switching elements (T5D, T6D) is limited topologically to half the direct current input voltage (Vin), thereby reducing switching losses and resulting in a high performance converter.

A wireless local area network adapted for use by users traveling on a mobile platform such as an aircraft. The network includes a network server located on the mobile platform, and at least one network access point connected to the server and accessible wirelessly by at least one user portable electronic device over one of a plurality of non-overlapping network frequency channels. The RF characteristics of this wireless network are specifically tailored to meet applicable standards for electromagnetic compatibility with aircraft systems and RF exposure levels for passengers and flight crews.

A motor vehicle headlight comprises a mirror having mounted therein a discharge lamp, a mask placed in front of the lamp, and a shielding plate of conductive material extending behind the mirror. The mask is made of conductive material and is connected to a fixed potential to capture the parasitic electromagnetic fields emitted forwards from the lamp. According to the invention, the shielding plate is constituted by a cover extending behind and along the mirror and connected to said fixed potential. The invention is applicable to ensuring electromagnetic compatibility for discharge lamp headlights.

The invention provides a highfield high uniformity nuclear magnetic resonance superconducting magnet system. The highfield high uniformity nuclear magnetic resonance superconducting magnet system comprises a main winding (1) and a magnetic field uniformity compensation winding (19) having a positive and negative current combination; the main winding (1) and the magnetic field uniformity compensation winding (19) consist of 24 superconducting windings coiled by NbTi / Cu low temperature superconducting lines; a 9.4T magnetic field is generated in a room temperature space which is 800 millimeters high, so that the non-uniformity of the magnetic field within the range of 300 millimeters is less than 0.1ppm. A low temperature container (2) of a superconducting magnet and liquid helium (4) is arranged inside the superconducting magnet system, so a 4K low temperature environment required by the normal running of the superconducting magnet can be provided for the superconducting magnet. By a ferromagnetic shielding system, the superconducting magnet has high electromagnetic compatibility. The superconducting magnet system has the advantages of compact structure and low running cost.

The invention provides a driving method and a device for adjusting LBD brightness with high power; the method can obtain the LBD brightness data through receiving the control information input from the outer side; the current flowing through the LBD can be set through a current adjusting unit connected with the driving unit, the LBD is lighted so as to lead the brightness to reach the target value; or the current flowing through the LBD can be set according to the method, the LBD brightness can be primarily adjusted, and then the signal dutyfactor of the PWM adjusting unit connected with the current adjusting unit in parallel is set, the LBD brightness is further adjusted to finally reach the target value; the LBD can be turned off through setting the dutyfactor of PWM adjusting unit signal to 0%. the technical proposal provided by the invention is utilized to dynamically adjust the LBD brightness in real time, and remarkably improve the EMC (electromagnetic compatibility) property of the device at the same time, and prolong the service life of the LED.

The invention belongs to an electromagnetic compatibility fault diagnosis method and particularly relates to an interference source identification method in a system-grade electromagnetic compatibility fault diagnosis. The interference source identification method is characterized by comprising the following steps of: step 101, utilizing positioning sensitive equipment; step 102, carrying out fault tree analysis on the positioning sensitive equipment; step 103, performing the fault tree analysis so as to obtain a priority level of a coupling path; step 104, testing to obtain interference testing data; step 105, storing the testing data into a database; step 106, obtaining a potential interference source through the fault tree analysis of the step 102; step 107, searching and determining the priority level of the interference source; step 108, combining the step 105 and the step 107 to identify the interference source; step 109, judging whether the interference source is a determined interference signal or not; if not, carrying out step 110; otherwise, carrying out step 111; step 110, carrying out environment monitoring; and step 111, obtaining the determined interference signal and finally, finishing the compatibility fault diagnosis. The interference source identification method in an electromagnetic compatibility fault diagnosis system has the advantages of convenience for use, short period, low cost and controllable faults.

An electromagnetic compatibility test method for electric propulsion system comprises the following steps: wave transparent rate of wave transparent subsidiary cabins of electric propulsion system is measured; steady state and transient state electric field radiation of electric propulsion system and steady state power line conducted emission are measured; spike of power line when electric propulsion system is in transient state working condition is measured; conduction of fictitious load and radiation emission characteristic and actual thrustor are compared and measured; influence of plume to communication is measured to obtain electromagnetic compatibility test data of electric propulsion system. The inventive method is not required to be carried out in an electromagnetic compatibility laboratory, and can be tested on out-field or working site of electric propulsion system, the test result has little error and can authentically reflect electromagnetic compatibility of the propulsion system, thus greatly lowering test cost and improving working efficiency.

The invention discloses an optical calibration method of an ultrasonic probe. The optical calibration method of the ultrasonic probe includes the following steps: (1) pasting character identification points on the ultrasonic probe, (2) fixing a three-dimensional calibration template and optical positioning equipment, (3) and holding the ultrasonic probe in hand to scan the three-dimensional calibration template, obtaining a space gesture of the ultrasonic probe by using the optical positioning equipment at the time of every time gathering ultrasound images to obtain original data and calibrating the ultrasonic probe by using a least square method. Compared with a traditional electromagnetic calibration method, the optical calibration method of the ultrasonic probe has the advantages that calibration results are more accurate, due to the fact that in the process of calculation only an unknown number exists (an unknown transformation matrix), complexity of calibration calculation is reduced, the optical calibration method of the ultrasonic probe can be applied into various types of ultrasound probes, equipment is simple and convenient and range of application is wide. The optical positioning equipment is used for obtaining the gesture of the ultrasonic probe, influence of power cords is not needed to consider and calibration range is wider, and the optical positioning equipment does not have a problem of electromagnetic compatibility in a surgical navigation environment.

The invention relates to a flexible heat conduction interface material with a wave absorbing function, which comprises the following components in parts by mass: 100 parts of vinyl silicone oil, 100 to 1,000 parts of a heat conducting filler, 100 to 1,000 parts of a wave absorbing material, 1 to 50 parts of hydrogen-containing silicone oil, 0.01 to 1 part of a platinum catalyst, and 0.01 to 1 part of an inhibitor. The flexible heat conduction interface material has the advantages that a high-thermal-conductivity caulking interface is produced by a mixture prepared by mixing the vinyl silicone oil, the heat conducting filler, the wave absorbing material, the hydrogen-containing silicone oil, the platinum catalyst and the inhibitor; due to addition of the wave absorbing material, the mixture has an excellent electromagnetic parameter, and the electromagnetic parameter of the mixture can be achieved by regulating a particle size of micro particles of the wave absorbing material; and the flexible heat conduction interface material is beneficial to impedance matching and widening of an absorption band and can meet the requirements of the electron and communication industries for high-efficiency energy conduction and electromagnetic compatibility. In addition, the invention further provides a preparation method of the flexible heat conduction interface material with the wave absorbing function.

An in-the-ear hearing aid is to have a more compact design. For this purpose there is inserted into a housing shell an electronics module having all the electronic components of the hearing aid, the electronic components being secured to a flexible supporting structure. As a result of the open construction of the electronics module, the individual electronic components can be compactly inserted with short stranded wires, thus also increasing electromagnetic compatibility. The flexibility of the supporting structure enables allowance to be made for individually differing auditory canal shapes.

A gasket retainer is mounted on a connector body to hold a rounded conductive gasket in position around an open end of the connector body. The gasket retainer has an elongated body with an upper surface, a lower surface and a central open portion to form an outer peripheral portion, surrounding the central open portion, having two side edges and two end walls. Gasket retaining portions, which may be a number of fingers extend upwardly away from the upper surface of the two side edges and recesses are formed in the two end walls to allow holding portions on the connector body to secure the retainer adjacent the open end with the rounded conductive gasket held in position, flush against the connector body to improve the shielding effectiveness in fibre channel SFP transceiver electro magnetic compatibility when connected.

The invention provides a USB (Universal Serial Bus) interface circuit which comprises a USB connector, a power common mode filter module, a signal common mode filter module, a power differential mode filter module, a signal differential mode filter module and an electrostatic protection module. Common mode interference, differential mode interference, electrostatic interference and the like on a power line and a signal line in the circuit can be eliminated; particularly, the additionally arranged power common mode filter module can eliminate common mode interference between a power VBUS and a working ground GND; and the circuit is small in size, low in cost and high in practicability, has very good protection effects on electrostatic discharge (ESD) and electromagnetic interference (EMI), allows a USB signal to be free from distortion, and ensures that a product smoothly passes USB certification and EMC (Electromagnetic Compatibility) certification. In addition, a high-voltage protection module and a high-frequency filter module can eliminate high-voltage signal interference and high-frequency signal interference in the circuit, so that the interference resistance of the USB interface circuit is further improved, and the signal transmission performance of the USB interface circuit is improved.

The invention discloses a radiation electromagnetic compatibility test method for an electric propulsion system and on-star radio frequency equipment. Firstly, an ion thruster is arranged in a wave transmitting secondary cabin; the wave transmitting secondary cabin is connected with a main vacuum tank; and electromagnetic radiation interference produced by a plume of the ion thruster is emitted out of the main vacuum tank through the wave transmitting secondary cabin. Each equipment and antenna are connected. When the electric propulsion system is started to normally work, both uplink level and downlink level of a responder are weak levels; conditions of uplink instruction reception and downlink remote metering error code are checked; if the instruction reception is correct, the code ratemeets the requirement and the responder is not interfered; remote metering parameters for a GPS (Global Positioning System) receiver are observed, and absolute positioning condition and relative positioning condition are determined; and if the remote metering is correct and the positioning is normal, the GPS receiver is not interfered.

Electromagnetic compatibility of an information handling system and peripheral for achieving defined electromagnetic interference constraints is tested through a test adapter that interfaces with an external cable connecting the information handling system and peripheral. Signals from the external cable are passed through an isolation resistor and parallel capacitance to compensate for input capacitance of a signal tester. A common mode choke isolates a common mode component of the signal at the external cable. A noise generator applies a signal through the test adapter to the external cable to allow measurement of signals emitted from the peripheral due to injected noise.