696 results about "Characteristic impedance" patented technology

The invention discloses a self-adaptive impedance matching method for a high-frequency signal transmission connector of a new energy vehicle, and relates to the technical field of signal processing, and the method comprises the steps: 1, obtaining the physical parameters of the high-frequency signal transmission connector of the new energy vehicle; calculating an electromagnetic field feature vector, and calculating a transmission line distribution vector of the high-frequency signal transmission connector; 2, calculating a propagation constant of a high-frequency signal transmission connector of the new energy vehicle; calculating the characteristic impedance of a high-frequency signal transmission connector of the new energy vehicle; 3, calculating a reflection coefficient; calculating an impedance error; step 4, calculating a compensation parameter vector, and generating a control signal by using an adaptive control theory according to the compensation parameter vector; and calculating the impedance matching degree according to the control signal. According to the invention, impedance change in a complex environment can be accurately dealt with, signal reflection and energy loss are significantly reduced, and transmission efficiency and signal integrity are improved.

The invention relates to the technical field of vehicle charging station operation and maintenance management, and particularly discloses a new energy vehicle charging station operation and maintenance management system and method based on the Internet of Things, and the method comprises the steps: collecting high-frequency harmonic characteristic data in a charging process in real time, and generating harmonic-impedance spectrum combined monitoring data; extracting dynamic attenuation gradient data of the line characteristic impedance; when the dynamic attenuation gradient data is lower than a preset critical safety threshold value, triggering a charging mode switching instruction; the charging piles are controlled to be switched into a charging mode, the phase difference parameters of the multiple charging piles are dynamically optimized, and a phase difference dynamic adjustment instruction set is generated; and finally, self-adaptive correction of the impedance compensation amount is carried out through the MEC equipment, and by self-adaptive correction of the impedance compensation amount, the system can maintain that the overall impedance is constantly greater than a critical safety threshold value, and power loss and equipment damage caused by impedance mismatch are avoided. The real-time feedback mechanism is helpful for improving the energy efficiency of the system, reducing the operation cost and ensuring the long-term reliability of the charging infrastructure.

The invention relates to the technical field of integrated circuit testing, in particular to a distance-adjustable probe connector device which comprises an impedance detection unit which comprises a connector fixing part, a connector rotating part, a single connection port, a signal probe and a grounding probe. The impedance data unit is used for determining a characteristic impedance value of the tested microstrip line based on data acquired by the signal probe and the grounding probe; the pressure detection unit is used for determining the contact pressure according to the telescopic displacement of the signal probe and the grounding probe; the control unit determines the allowable range of the contact pressure of the probes based on the line width of the microstrip line to be tested and the distance between the probes, and adjusts the angle between the grounding probe and the surface of the PCB based on the contact pressure difference between the signal probe and the grounding probe and the line width of the microstrip line. And adjusting the contact pressure of the signal probe to obtain the effective characteristic impedance value of the tested microstrip line. According to the invention, the angle and pressure of the grounding probe are intelligently adjusted, and the problem of impedance measurement drift caused by pressure imbalance of double probes is eliminated.

The invention belongs to the technical field of wireless communication, and particularly relates to a self-repairing radio frequency coaxial cable, a leaky coaxial cable and a manufacturing method thereof. On the basis of meeting the standard of the communication cable, the technical problems of electrical performance deterioration, reliability reduction and service life reduction caused by micro damage of the foaming insulating layer in the use process of the cable are further solved. Tests show that the self-repairing technology provided by the invention is suitable for a mobile communication radio frequency coaxial cable and a leaky coaxial cable (the frequency range is 0.1 GHz-6 GHz). According to the HLRCTYZ-50-22 leaky coaxial cable in the YD / T2491 standard and the HCTAYZ-50-22 radio frequency coaxial cable in the YD / T1092 standard, when the voltage standing wave ratio is smaller than or equal to 1.20 and the characteristic impedance meets 50 + / -2 ohms, the MTBF (average fault-free time) of the leaky coaxial cable and the HCTAYZ-50-22 radio frequency coaxial cable can be improved by 20%-40% compared with that before improvement.

The invention discloses a cable copper shielding layer damage and damage opening size detection method, system and device based on the combination of a frequency doubling measurement method and a step-by-step evaluation method and a storage medium, and is applied to the technical field of power equipment state detection. Comprising the following steps: respectively acquiring measurement results of a cable to be measured under Chirp signal injection of Gaussian envelopes with single and double center frequencies, and determining the starting time of an injection signal and the arrival time of a reflection signal according to an extreme value in a time-frequency cross correlation curve; extracting an injection signal and a reflection signal by taking the starting time and the arrival time as extraction starting points and the length of the injection signal as an extraction width, and calculating the damage degree according to the spectrum ratio of the reflection signal to the injection signal; and calculating characteristic impedance based on the damage degree, and sequentially determining the size and length of the central angle of the cable copper shielding layer damage port by using a step-by-step evaluation method. According to the invention, effective detection and positioning of copper shield damage and effective estimation of the damage size are realized.

The invention discloses an image analysis method and system for quality control traceability of a satellite navigation board, and relates to the technical field of image processing. The method comprises the following steps: synchronously acquiring an image and three-dimensional point cloud data of a radio frequency transmission line area through a high-resolution area array CCD camera and a laser contourgraph; acquiring a transmission line contour based on image identification, and constructing a three-dimensional radio frequency line model through point cloud fitting; detecting the line width and the distance to the ground plane by using the model, and calculating the impedance prediction complexity in combination with a data acquisition error; dynamically calling a characteristic impedance prediction engine based on the complexity to obtain a predicted characteristic impedance sequence; and quality defect judgment is carried out, and traceability control is carried out on defective products. According to the method, a complete technical chain from geometric dimension detection to electrical performance evaluation is established, hidden defects which are difficult to find by a traditional method can be effectively identified, and the quality control precision and the product yield of the satellite navigation board are improved.

The disclosure provides a signaling link that overcomes or at least reduces the limitations of RC-dominated signaling wires, improving both the bandwidth and the power consumption of signaling circuits. Both an AC and a DC signaling link are disclosed. In one example, a signaling link is provided that includes: (1) a transmitter including a passive equalizer, (2) an over-terminated receiver, and (3) a lossy channel having a first end connected to the passive equalizer and a second end connected to the receiver, wherein the lossy channel has a channel characteristic impedance that is lower than a terminating impedance of the passive equalizer and a termination impedance of the receiver.

The invention belongs to the technical field of production control, and provides a production control method and system for a high-frequency data cable. The method comprises the following steps: detecting a group of thickness distribution data of a foaming belt at a belt placing end of the foaming belt by adopting a laser thickness gauge, and calculating to obtain a thickness distribution deviation value; when the thickness distribution deviation value exceeds a deviation threshold value, depth prediction is carried out on the group of thickness distribution data and the foaming belt type by using a conjoint analysis model based on lightweight temporary case data, and joint compensation parameters are obtained and comprise associated line pressing pressure and line pressing temperature; and a line pressing device integrated with a heating element is controlled to mechanically press the foaming belt, so that the density uniformity of the foaming layer is improved to be higher than a specified value. Through the temperature and pressure synergistic effect, the foaming belt is slightly softened and uniformly fills the gaps of the core wires, the density uniformity of the foaming layer can be further improved, and therefore the characteristic impedance consistency and the anti-interference performance of the cable are remarkably improved.

The invention relates to the technical field of electromagnetic wave time domain antennas, in particular to an anisotropic material-based ultra-wideband ground penetrating radar antenna, which comprises a time domain butterfly antenna unit, a sponge layer, an anisotropic material, a metal back cavity and a coaxial feed part. According to the invention, a butterfly antenna is mainly selected. The antenna is made of an all-metal material, the patch is an elliptical butterfly antenna, a distributed loading resistance loading mode is selected, the characteristic impedance of the antenna is basically kept unchanged along with the frequency, and meanwhile, the bandwidth is increased; the back cavity is added to reduce the influence of the surrounding environment and all parts in the system on the antenna and suppress the omnidirectional radiation of the antenna, and the absorption layer is added in the back cavity to cover the back cavity, so that multiple reflections between the antenna and the cavity are suppressed. The designed antenna is low in working frequency band, wide in frequency band, good in time-domain characteristic, simple in feeding and capable of achieving long-distance high-resolution detection under a deep layer.

The invention aims to provide a new energy high-frequency wire harness design method based on electromagnetic compatibility optimization, and relates to the technical field of new energy, and the method comprises the steps: 1, building a new energy high-frequency wire harness type electromagnetic source model, and obtaining the electromagnetic source intensity; calculating a spatial electromagnetic field intensity based on the electromagnetic source intensity; step 2, calculating equivalent transmission line parameters based on the space electromagnetic field intensity; based on the equivalent transmission line parameters, frequency-dependent characteristic impedance is calculated; step 3, calculating crosstalk voltage according to the frequency-variable characteristic impedance; calculating a radiation field of the new energy high-frequency wire harness; calculating the shielding effectiveness of the new energy high-frequency wire harness according to the radiation field; 4, according to the step 1, the step 2 and the step 3, constraint conditions are set, an objective function under the constraint conditions is established, and the objective function is solved through iteration to find the corresponding optimal design parameter vector of the new energy high-frequency wire harness. According to the invention, the transmission stability and the anti-interference capability of the new energy high-frequency wire harness are significantly improved.

Techniques and assemblies for enhanced circuit board layouts and circuit configurations are presented. In one example, an apparatus includes a circuit board having a power plane configured to carry electrical current from a power supply circuit to load circuitry. The power plane comprises a fence region that establishes an increased characteristic impedance of the power plane and has vias arrayed across the power plane which perforate the power plane and electrically couple to a ground plane of the circuit board. A filter is established at the fence region by at least capacitance elements electrically coupled between the power plane and the ground plane, the filter configured to route at least a portion of noise carried by the power plane to the ground plane at the fence region.

A radio-frequency system including: a self-complementary antenna characterized by an input impedance substantially independent of signal frequency across an operational frequency band; a passive coupling device characterized by a characteristic impedance and configured to couple the self-complementary antenna to a signal generator and a set of signal processors; a resistive matching network electrically connected between the self-complementary antenna and the passive coupling device configured to match the characteristic impedance of the passive coupling device to the input impedance of the self-complementary antenna; and a back-coupling line characterized by a substantially constant group delay across the operational frequency band configured to electromagnetically couple the signal generator to the set of signal processors.

According to the power distribution network fault protection and positioning method and system based on the fast switch, an edge calculation node adopts noise self-adaptive improved Morlet wavelet transform, and a current change rate and a voltage break variable are extracted from a transient signal; constructing a three-dimensional decision model taking the current change rate, the voltage break variable and the line characteristic impedance as variables; based on a three-dimensional decision-making model, when it is judged that an internal fault occurs by using the extracted current change rate and voltage break variable, the distributed detection unit sends the action state quantity of the equipment where the distributed detection unit is located to an edge computing node; after the edge computing node utilizes the action state matrix of the equipment, a state reasoning method based on a fuzzy Petri network is adopted to determine a fault section; verifying the fault section according to the matching degree of the fault current weighting and the characteristic impedance of the equipment in the fault section; after the fault section is verified, fault isolation is executed; and after fault isolation, fault positioning is optimized, and it is ensured that the cooperative breaking time sequence of the multi-stage switch is accurately matched with a fault diffusion path.

The invention discloses an impedance self-adaptive high-frequency probe, a probe card and a testing method, and belongs to the technical field of semiconductor high-frequency testing. When an existing high-frequency probe is used for a crimping test, a conductive probe body of the existing high-frequency probe generates mechanical deformation due to contact pressure, so that characteristic impedance is deviated, and uneven pressure in an array causes impedance dispersion. The problem is solved by coating the outer side of the conductive needle body with a composite material layer, the composite material layer is composed of an elastic insulating matrix and metal particles dispersed in the elastic insulating matrix, the metal particles have bimodal particle size distribution, and the total integral number is 30%-40%. When the probe is pressed, the composite material layer is subjected to reversible microscopic reconstruction, the effective dielectric constant of the composite material layer is increased along with the increase of the pressure, and the generated impedance change can counteract the impedance drop caused by the deformation of the conductive probe body, so that the self-adaptive stability of the characteristic impedance of the probe under the change of the pressure is realized. The impedance dispersion of the probe array can be remarkably reduced, the consistency and precision of high-frequency testing are improved, and the process compatibility is good.

A fault detection system for detecting a fault condition in a direct current (DC) system. The system may include a transmitter including a DC source to energize a cable and a receiver connected to the cable and including a signal generator to generate a periodic signal. The transmitter may include a termination impedance matched to the characteristic impedance of the cable to absorb substantially all the periodic signal. The transmitter may include a fault detection circuit coupled to the cable to detect changes in the frequency response of the cable by tracking changes in the envelope of the power of the periodic signal and outputting a fault signal if the rate-of-change of the envelope of the power of the period signal exceeds a threshold level.

A high-frequency component test device including a test key and a test module is provided. The test key includes a front-level key and a back-level key which are arranged symmetrically and have the same electrical length and characteristic impedance. The test module is used to measure an S parameter of the front-level key and the back-level key connected directly and an S parameter of a structure where a device under test (DUT) is added between the front-level key and the back-level key. The test module performs S parameter calculation in the frequency domain and converts the S parameter into an ABCD parameter matrix, and then obtains an ABCD parameter of a de-embedded DUT using a matrix root-opening operation and an inverse matrix operation.

The invention provides a liquid crystal phase shifter, an antenna device and an antenna system, and relates to the technical field of communication. The liquid crystal phase shifter comprises a first dielectric substrate, a grounding metal layer, a dielectric functional layer, a micro-strip signal line and a second dielectric substrate which are stacked in sequence, the grounding metal layer is provided with a plurality of groups of grid structures which are arranged at intervals, and each group of grid structure comprises a plurality of grids which are distributed at intervals; and the length direction of the micro-strip signal line is parallel to the arrangement direction of the plurality of groups of grid structures. In the embodiment of the invention, the defected ground structure is formed by the plurality of groups of grid structures on the grounding metal layer, so that a relatively wide microstrip signal line can be conveniently arranged, and a relatively thin dielectric functional layer can be arranged under the condition that the characteristic impedance of the liquid crystal phase shifter is ensured, so that the miniaturized liquid crystal phase shifter is realized; in addition, when phase shifting is carried out based on the liquid crystal phase shifter, the thinner dielectric functional layer is convenient for reducing loss and improving response speed, so that the phase shifting performance of the liquid crystal phase shifter is improved.

The invention discloses an optimization method of a butterfly-shaped UHF antenna, and the method comprises the following steps: determining a preset angle range of a semi-apex angle based on the matching relation between the characteristic impedance of the butterfly-shaped antenna and the working frequency band width, so as to achieve the stable change of the input impedance and the broadening of the frequency band; according to the wavelength of the low-frequency end of the working frequency band, a preset proportional relation between the arm length and the wavelength is established to determine the value of the arm length, so that the requirement of the antenna impedance bandwidth on low-frequency-band signal receiving is met; a butterfly antenna is arranged in a metal back cavity to form a back cavity type antenna, the height of the back cavity is determined according to the wavelength corresponding to the strongest frequency of a signal so as to suppress back radiation and enhance forward radiation gain, and systematic improvement of electromagnetic wave signal receiving performance is realized through collaborative optimization of structural parameters of the butterfly antenna and the back cavity.

The invention relates to the field of electrical variable measurement, in particular to an insulating layer compactness detection method for a mineral cable, which comprises the following steps: firstly, acquiring a time domain reflection signal of the cable, and carrying out denoising pretreatment by utilizing synchronous average and wavelet transform; and then, carrying out spectrum analysis on the discrete signal segments, calculating a spectrum centroid offset rate to determine high-frequency energy attenuation, and constructing a dynamic compensation gain coefficient according to the high-frequency energy attenuation. And then, improving a traditional layer stripping algorithm by using the gain coefficient, eliminating calculation deviation caused by transmission loss, and accurately reconstructing characteristic impedance distribution along the cable. And finally, by comparing the deviation between the reconstructed impedance and the nominal impedance, positioning and judging the abnormities of the compactness of the insulating layer of the cable and the eccentricity defect of the cable core are realized.

The invention discloses an adjustable noise reduction device, a noise reduction adjusting method and a range hood, the adjustable noise reduction device comprises a sound absorption chamber and a cover plate covering the sound absorption chamber, each layer of cover plate comprises a plurality of parallel and spaced battens, and the battens of the adjacent upper and lower layers are arranged in a staggered manner to form a plurality of micropores communicating with the sound absorption chamber; a plurality of driving mechanisms are arranged on the side edge of the sound absorption cavity, and the driving mechanisms on the different side edges are connected with the battens on the different layers correspondingly. The driving mechanism is used for driving the battens to move so as to adjust the distance between the battens on the same layer. According to the adjustable noise reduction device, the noise reduction adjusting method and the range hood, the structural strength is improved, meanwhile, the adverse factor that the acoustic resistance is too large due to the fact that the plate thickness is increased is avoided, the adjustable noise reduction device can be matched with the characteristic impedance of air, and therefore the sound absorption and noise reduction effect is improved. In addition, the sound absorption frequency band of the adjustable noise reduction device can be adjusted, the sound absorption capacity under different frequencies is improved, and therefore the adaptability to different working conditions and the sound absorption and noise reduction effect are improved.

The invention provides a characteristic impedance testing method, device and equipment and a medium, and relates to the technical field of radio frequency, the characteristic impedance testing method is used for testing to obtain a characteristic impedance value of a cable, the cable is provided with an input end and an output end, and the input end of the cable is used for accessing a radio frequency signal. The characteristic impedance test method comprises the steps of controlling an input end of a cable to access a radio frequency signal, controlling an output end of the cable to be grounded, obtaining a first voltage value and a first current value of the output end of the cable, and obtaining a first impedance value according to the first voltage value and the first current value; controlling the input end of the cable to access a radio frequency signal, controlling the output end of the cable to open, obtaining a second voltage value and a second current value of the output end of the cable, and obtaining a second impedance value according to the second voltage value and the second current value; and determining a characteristic impedance value of the cable according to the first impedance modulus value and the second impedance modulus value. According to the invention, the characteristic impedance value of the cable can be tested.

The invention discloses a resistor matching structure, a chip, an optical device and an optical module, and belongs to the technical field of electronics. The resistor matching structure comprises a plurality of strip-shaped resistors and a conductive structure, wherein the ends, close to the conductive structure, of the strip-shaped resistors are connected with the conductive structure, the ends, away from the conductive structure, of the strip-shaped resistors are used for being connected with the strip-shaped conductors, and the multiple strip-shaped resistors are jointly used for being connected with the multiple strip-shaped conductors; at least one resistor pair exists in the plurality of strip-shaped resistors, each resistor pair comprises two adjacent strip-shaped resistors which can be mutually inducted, and strip-shaped conductors connected with the two strip-shaped resistors have different potentials. In order to realize resistance matching, the total impedance of the plurality of strip-shaped resistors is equal to the total characteristic impedance of the plurality of strip-shaped conductors. According to the modulator, the problem that the modulated optical signal is affected by the reflected electric signal in the modulator, and the optical signal is degraded can be solved. The application is used for resistance matching.

The invention discloses a 16-in-one high-power combiner working in a radio frequency band, and belongs to the technical field of fusion radio frequency heating. The invention comprises a coaxial input hard feeder line, a radial transmission line (RTL), a gradient impedance matching coaxial line and a coaxial output hard feeder line. The physical size is designed through theoretical calculation, electromagnetic field distribution is optimized through simulation, 16 radio-frequency signal input ports are designed through radial symmetric topology, a radial transmission line serves as a main synthesis path of radio-frequency signal source power, the power input by the 16 radio-frequency signal source ports is subjected to one-step efficient synthesis in the center of the radial transmission line, and the radio-frequency signal source power is obtained. And the 50-ohm characteristic impedance standard output of the synthesized radio frequency signal power is realized through an impedance matching technology. The sixteen-in-one power combiner designed by the invention has the characteristics of high synthesis efficiency, symmetrical structure, good amplitude and phase consistency, high isolation, low return loss, low reflection loss, simple design structure, easiness in manufacturing and the like.

The invention discloses a method for measuring and calculating parameters of a same-tower double-circuit alternating-current transmission line under high induced voltage. The method comprises the following steps: dividing the same-tower double-circuit transmission line into three groups of wiring modes; measuring the short-circuit impedance in each wiring mode and the line impedance in a mode that the tail end of the line is grounded through impedance; calculating the characteristic impedance and the propagation coefficient in the corresponding wiring mode by using the impedance measurement result of the line through impedance grounding and the line short-circuit impedance measurement result in each wiring mode, and further calculating the distribution impedance and the distribution admittance in the corresponding mode; and finally, calculating the resistance, inductance and ground capacitance of each phase lead of the same-tower double-circuit line, the inter-phase coupling capacitance and inter-phase coupling inductance of the single-circuit line, and the coupling capacitance and coupling inductance between each phase lead of the double-circuit line through the distributed impedance and distributed admittance in each wiring mode and simultaneous equations. Through the method, the induced voltage on the measured circuit can be effectively reduced, and meanwhile accurate measurement can be achieved.

The invention provides a matching parameter determination method and a related device, and relates to the technical field of radio frequency, the matching parameter determination method is used for determining a matching parameter, and the matching parameter comprises a reflection coefficient module value. The matching parameter determination method comprises the following steps: at least obtaining a test current value and a test voltage value of a load when a test AC source outputs a test AC signal to the load; determining a resistance value and an impedance module value of the load at least according to the test current value and the test voltage value; determining a reflection coefficient module value according to the preset characteristic impedance value, the resistance value of the load and the impedance module value; wherein the reflection coefficient module value is used for reflecting the impedance matching condition between the radio frequency power supply and the load when the radio frequency power supply outputs the radio frequency signal to the load. The method can quickly determine the module value of the reflection coefficient.

The utility model belongs to the technical field of vibration and noise reduction, and relates to an external interference noise suppression module integrated in a hydrophone. The module comprises a high-characteristic-impedance metal round rod and two low-characteristic-impedance rubber round rods, the rubber round rods are connected to the two ends of the metal round rod, the cross sectional areas of the metal round rod and the rubber round rods for transmitting interference elastic waves are the same, and the lengths of the two rubber round rods are different, so that half-wavelength total transmission is restrained. The interference longitudinal wave passes through the noise suppression module, most energy is lost, and the interference noise is effectively suppressed. The utility model has the effects and benefits that the external interference noise is reduced, and the anti-interference level of the hydrophone is improved. The device is widely applied to noise suppression design of the hydrophone, is simple in structure, is convenient to integrate in the hydrophone, and can stably work in seawater for a long time.

The invention belongs to the technical field of superconducting coaxial cable processing, and particularly relates to a superconducting coaxial cable and a preparation method and application thereof. The superconducting coaxial cable is composed of an outer conductor, a PTFE insulation module and an inner conductor arranged in the PTFE insulation module, the PTFE insulation module is a cylinder with a through hole in the center, supporting structures are symmetrically arranged at the two axial ends of the cylinder, a non-supporting structure is arranged in the middle of the cylinder, and the specific structure of the PTFE insulation module effectively regulates and controls the effective dielectric constant of an insulator. Therefore, the characteristic impedance of the superconducting coaxial cable is flexibly and finely adjusted, and the application requirement of a quantum computer signal transmission device on the characteristic impedance is met. The PTFE insulating module is prepared by pressing and sintering, and NbTi filaments are embedded into the prepared PTFE module by a heating method and are assembled with an outer conductor to form the superconductive coaxial cable. The method is simple in process, convenient to assemble and suitable for large-scale production.

The invention discloses a coplanar waveguide-rectangular waveguide horizontal conversion feed structure and a waveguide slot antenna, and belongs to the technical field of radar antennas. The structure mainly comprises a rectangular waveguide conversion section of which one end is connected with a rectangular waveguide and the other end is connected with a coplanar waveguide conversion section, and the rectangular waveguide conversion section is used for converting a dominant mode signal transmitted by the coplanar waveguide into a dominant mode signal transmitted by the rectangular waveguide; and one end of the coplanar waveguide conversion section is connected with the rectangular waveguide conversion section, the other end of the coplanar waveguide conversion section is connected with the coplanar waveguide feeder line, and the coplanar waveguide conversion section is used for performing impedance conversion on the input impedance of the rectangular waveguide conversion section and matching the impedance with the characteristic impedance of the coplanar waveguide feeder line. According to the invention, effective conversion of microwave or millimeter wave signals between the coplanar waveguide and the rectangular waveguide can be realized without vertical transition, and the antenna has the characteristics of simple structure, low profile, simple process and low loss.

The invention discloses a non-contact injection lithium battery high-frequency impedance online measurement method and system. The method comprises the following operation steps: S1, setting the amplitude and frequency of a high-frequency characteristic signal vinj.f in a high-frequency sine power supply; s2, injecting a high-frequency characteristic signal vinj.f generated by the high-frequency sine power supply into the lithium battery through a non-contact injection unit in an electromagnetic coupling non-contact manner; s3, carrying out sampling and algorithm processing on the voltage vb at the two ends of the lithium battery and the current ib flowing through the lithium battery to obtain a characteristic voltage amplitude vb.f, a characteristic voltage phase angle thetav, a characteristic current amplitude ib.f and a characteristic current phase angle thetai of the lithium battery under the current specified high frequency f; s4, calculating to obtain a characteristic impedance amplitude zb.f and a characteristic impedance angle theta Z of the lithium battery under the specified high frequency f; under the condition that the original loop structure of the lithium battery is not changed, the high-frequency characteristic signal is injected into the lithium battery through the non-contact injection unit in an electromagnetic coupling non-contact mode, and effective online measurement of the high-frequency impedance of the lithium battery is achieved.

Circuitry and method are described for enabling multiple loads on a differential low voltage differential signaling pair (M-LVDS). A printed circuit board (PCB) contains a M-LVDS driver and leads that route a main channel that carries a differential signal from the driver to an area in which loads are populated. The main channel is split into branches that contain application-specific integrated circuits (ASICs) as the loads. The branches have the same characteristic impedance as the main channel. Filters are disposed in each branch and are coupled between the driver and the ASICs. Each filter is a first order or higher filter. Fewer filters than ASICs are on each branch, with the filters being disposed between the driver and ASICs closest to the driver (with smaller propagation delay). The filters are configured differently at each ASIC input to compensate for the delay.