200 results about "Line resistance" patented technology

The invention aims to provide an on-line monitoring device and a detection method for an electrical loop, and relates to a method and a system for dynamically calculating a conductor or contact resistance value and predicting a conductor or connection point degradation risk by acquiring current and voltage data of a conductor or an electrical connection point in real time, and a method and a system for dynamically analyzing a resistance change trend to determine a conductor or connection point degradation risk. Early warning of the health state of the conductor or the connection point is achieved, and the electrical fire prevention and control capability can be improved. The system comprises an electrical loop, a current detection module and a voltage detection module, the current detection module is arranged in the electrical loop to be detected, the voltage detection module is connected to the two ends of the electrical loop, and the current detection module and the voltage detection module are both in communication connection with a server through a data processing module and a networking module. The method is applied to the technical field of AC / DC power supply and distribution system electrical equipment / line resistance and electrical connection point contact state monitoring.

The invention relates to the technical field of wireless charging, in particular to a constant-current and constant-voltage wireless electric energy transmission method and a constant-current and constant-voltage wireless electric energy transmission system. Obtaining the charging current of the next iteration based on the battery end voltage of each iteration in the constant current charging state, the actual output power of the electric energy transmitting end of each iteration, the charging current of each iteration and the equivalent line resistance; when an iteration cut-off condition is satisfied, obtaining a target charging current in a constant current charging state; based on the target charging current, a preset standard current and the internal resistance of the battery, obtaining a voltage compensation amount caused by the change of the charging current; the target switching voltage is obtained according to the voltage compensation amount and the preset standard switching voltage, the constant current charging state can be switched to the next charging state according to the target switching voltage, effective, timely and reliable switching of the constant current is ensured, and then the wireless charging efficiency and safety are ensured.

The embodiment of the invention provides a circuit board and computing equipment. The circuit board comprises a carrier board; the temperature monitoring loop comprises a monitoring wire, a leading-out wire and a sampling resistor, the monitoring wire is arranged in a monitoring area of the carrier plate, the sampling resistor is arranged in a control area of the carrier plate, the leading-out wire is connected between the monitoring wire and the sampling resistor in series, the monitoring wire is configured to have a preset thermosensitive resistance value range, and the sampling resistor is configured to have a preset thermosensitive resistance value range. The sampling resistor has a given resistance value, and the thermosensitive resistance value in a preset thermosensitive resistance value range and the given resistance value are both higher than the line resistance value of the lead-out wire; the detection circuit is arranged in the control area, the detection circuit is used for detecting the voltage at the two ends of the sampling resistor to obtain detection voltage, and the change of the detection voltage is in inverse correlation with the change of the temperature of the monitoring area; and the control circuit is arranged in the control area, is connected with the detection circuit and is used for judging the temperature state of the monitoring area based on the detection voltage.

The invention discloses an electric energy quality loss test method, system and device and a medium. The method comprises the following steps: acquiring three-phase voltage data and three-phase current data; calculating the equivalent total loss power in the power distribution network line through the apparent power value, the voltage and the resistance based on the collected voltage and current data; and based on the equivalent total loss power, in combination with the power factors of different line losses, carrying out line loss subentry decoupling to obtain additional line losses caused by different electric energy quality problems. According to the invention, extra loss of the line caused by electric energy quality can be accurately measured, and line resistance does not need to be measured.

The invention discloses a monitoring device and method for tower sweeping of blades of a wind generating set. The device comprises a fan master controller, a variable-pitch driver and a metal coating net arranged on the blades. Reference resistors are arranged at two ends of a measuring port of the variable-pitch driver; the fan master controller is connected with the variable pitch driver; the wire resistor and the metal coating net are connected in series and then are connected in parallel with the reference resistor; the metal coating net is composed of metal coating strips arranged in sequence, and the two ends of the metal coating net are electrically connected with the embedded binding posts in the cavity in the blade respectively. Binding posts are embedded in the blade body and used for connecting the metal coating net into a variable-pitch driver through wires in the fan hoisting and debugging stage. And the wire resistor is a resistor of a wire between the blade pre-embedded binding post and the variable pitch driver. According to the method, the dangerous working condition of tower sweeping can be accurately recognized, the unit is controlled to complete safe propeller collection, and the accuracy of fault recognition and the safety of the unit are improved.

The invention relates to a micro-grid energy storage multi-agent distributed secondary control method based on MFAPC, and the method comprises the following steps: 1, obtaining a dynamic estimation value of a global state through a multi-agent consistency protocol based on a communication structure of a sparse communication network; step 2, adopting an adaptive power balance algorithm to realize SoC balance of the distributed ESS with different capacities; and step 3, accurately tracking expected voltage and power of the system by adopting non-linear single-input multi-output ESS model-free adaptive prediction control based on tight-format dynamic linearization, realizing stable operation of the microgrid and SoC balance of the ESS under the condition of not depending on microgrid topology, line resistance impedance and load requirements, and improving robustness of the system. 4, through analysis, the stability of system output tracking errors and global bounded input and bounded output of the controller is guaranteed; the method has the advantages that a model-free adaptive prediction control method is adopted, the prediction order is large, the accuracy is high, and the robustness is high.

The invention relates to an electric drive system efficiency test compensation method, a storage medium and a program product, and relates to the technical field of new energy automobiles. The method is executed by a rack control system, and comprises the following steps: acquiring mechanical friction torque and friction mechanical power when a dynamometer idles; collecting the line resistance of a direct current bus between a power battery of the vehicle and a motor controller and the line resistance of a three-phase end line between a motor of the vehicle and the motor controller before the efficiency test; relevant parameters in the efficiency testing process are collected, wherein the relevant parameters comprise direct-current bus current, direct-current bus power, U-phase current, V-phase current, W-phase current, three-phase electric power, dynamometer rotating speed, dynamometer actual measurement torque and dynamometer mechanical power; according to the friction mechanical power, the line resistance of the direct current bus, the line resistance of the three-phase end line and related parameters, the efficiency compensation of the electric driving system is calculated, so that the accuracy of the efficiency test compensation calculation of the electric driving system is improved.

The invention provides a test structure and a test method thereof, which are applied to the technical field of semiconductors. In the invention, a first tested element and a second tested element are arranged in a mutually separated manner along a first direction, each pad group comprises a first sub-pad and a second sub-pad which are arranged in a mutually separated manner, electric connecting wires comprise a first electric connecting wire and a second electric connecting wire, and the sizes of the first sub-pad and the second sub-pad are set to be the same. The resistance values of the first electric connecting wire and the second electric connecting wire are the same, so that when the same probe is used for testing the first tested element and the second tested element, the contact resistances between the first sub-bonding pad and the second sub-bonding pad which are the same in size and the probe are the same; the resistance values of the first electric connecting line and the second electric connecting line with the same resistance value can be offset during difference operation, so that the influence of the contact resistance and the resistance of the electric connecting lines in the transistor element on the measurement accuracy of the on-resistance of the transistor element is avoided, namely, the purpose of reducing the measurement error is achieved.

The invention discloses a semiconductor structure, a manufacturing method thereof and electronic equipment. The semiconductor structure includes: an active pillar extending in a vertical direction; the word line extends along a first horizontal direction and is coupled with the active column to form a transistor; bit lines extending along a second horizontal direction and coupled to the active pillars, where the second horizontal direction intersects the first horizontal direction; wherein the word line comprises a first conductive pattern and a second conductive pattern, the first conductive pattern is provided with first openings and second openings, the first openings and the second openings are alternately arranged in the first horizontal direction, the active columns are located in the first openings, and the second conductive pattern is located in the second openings. The resistivity of the second conductive pattern is smaller than the resistivity of the first conductive pattern. The semiconductor structure is beneficial to reducing word line resistance and improving device performance.

The application provides an Ethernet-based linear series monitoring system and related equipment, the linear series monitoring system comprising a host device and a plurality of slave devices, a main power supply tap being led out from a secondary coil of each first coupling transformer, and an output end of a first power supply unit being connected with each main power supply tap; a primary tap being led out from a primary coil of each second coupling transformer, and a secondary tap being led out from a secondary coil of each third coupling transformer, a primary tap of an nth second coupling transformer in the same slave device being connected with a secondary tap of an nth third coupling transformer; and the primary taps of the N second coupling transformers in the same slave device all being connected with an input end of a rectifier unit. After the first power supply unit starts to supply power, parallel power supply is performed through 2N wires, so that the equivalent comprehensive line resistance is reduced, the voltage drop and loss are reduced, and the stability of line power supply is improved.

The utility model discloses a flexible circuit board of a battery module, and the flexible circuit board comprises a plugging terminal which is located at one end of the flexible circuit board in the length direction; the number of the nickel sheets is multiple, and the multiple nickel sheets are arranged at intervals in the length direction; the lead and the nickel sheet are respectively and independently connected with the plugging terminal through the lead; wherein the length of the wire and the width of the wire meet the following conditions: the length of the wire is less than or equal to 0.5 m, and the width of the wire is 0.444-0.500 mm; the length of the wire is greater than 0.5 m and less than or equal to 1m, and the width of the wire is 0.889-1.000 mm; the length of the wire is larger than 1m and smaller than or equal to 1.5 m, and the width of the wire is 1.333 mm to 1.500 mm. The utility model further discloses a battery pack. The flexible circuit board provided by the utility model effectively reduces the line resistance difference of the acquisition line of the whole battery module, thereby effectively reducing the voltage drop of the acquisition line and improving the acquisition accuracy.

The present invention relates to a high-precision impedance detection circuit that can overcome the influence of distributed parameters and line resistance, which is composed of an impedance sensor, an integrated operational amplifier, and a current detection resistor; during detection, a known excitation voltage is applied to the measured medium through the sensor, and then the response current of the measured medium is detected; the excitation is connected to the non-inverting input terminal of the first operational amplifier, and its output terminal is connected to the excitation electrode of one plate of the sensor through the shielding layer of the shielded wire. The sensing electrode of the same plate is fed back to the inverting input terminal of the first operational amplifier through the inner core of the shielded wire; the sensing electrode of the other plate of the sensor is connected to the inverting input terminal of the third operational amplifier through the inner core of the triple coaxial cable, and the excitation electrode is connected to the current detection resistor through the inner shielding layer of the triple coaxial cable and then connected to the output terminal of the third operational amplifier, and its non-inverting input terminal is grounded; on the instrument side, the inner shielding layer of the triple coaxial cable is connected to its outer shielding layer after being driven by the voltage follower of the second operational amplifier; the circuit impedance detection of the present invention has high precision and strong anti-interference ability.

The utility model relates to the technical field of electronic equipment, in particular to a camera module capable of preventing signal interference, which comprises a PCB (printed circuit board) and a fixed base, and is characterized in that the fixed base is positioned above the PCB and is fixedly connected with the PCB, a lens component is arranged on the fixed base, a sensing component is arranged on the surface of the PCB, and the lens component is positioned above the PCB. The lens assembly comprises a lens body, a wide angle and a protective cover, through cooperative use of the above structures, signal attenuation is reduced, a USB interface is close to the edge, connection with external equipment is facilitated, the integrity of USB signals is ensured through reasonable wiring layout, and for high-speed signals such as a camera image data transmission line, the data transmission efficiency is improved. A differential wiring mode is adopted, and the wiring length and spacing are strictly controlled so as to match impedance, reduce signal reflection, thicken power supply wiring, reduce line resistance, ensure the stability of power supply and reduce the power consumption of the camera.

An ammeter relates to the low-voltage electrical technology field. The invention provides an electric meter. The electric meter comprises a shell, a load switch and a wiring port, the load switch is arranged in the shell, the wiring port is arranged on one side of the shell, a magnetic system and a contact mechanism are arranged in the load switch, and the movement direction of a movable iron core of the magnetic system is perpendicular to the direction of the arrangement side of the wiring port on the shell; the contact mechanism is arranged between the magnetic system and the wiring port and is connected with the magnetic system and the wiring port. According to the ammeter obtained by the above design, the strong magnetic interference resistance of the load switch can be improved through the exquisite layout, the wiring of the load switch and the ammeter is simpler and more reasonable, the conductive loop is shorter, and the line resistance is reduced.

The embodiment of the invention provides a collaborative energy scheduling method and device, and the method comprises the steps: obtaining the first load information of a first energy router in a railway station end, the second load information of a second energy router in a traction station end, and the third load information of a third energy router in a railway line end, the first line resistor is arranged between the large power grid end and the railway station end, the second line resistor is arranged between the railway station end and the traction station end, and the third line resistor is arranged between the traction station end and the railway line end. And calculating target scheduling data according to the first load information, the second load information, the third load information, the first line resistance, the second line resistance, the third line resistance and a preset cooperative scheduling calculation formula. According to the embodiment of the invention, the network loss can be greatly reduced, and the comprehensive utilization efficiency of grid connection of various energy sources in the railway network is improved.

The invention discloses a maximum reactive voltage regulation method at the tail end of a rural power grid in an interference environment. According to the method, if it is monitored that the voltage of the load side of the tail end of the rural power grid is smaller than a first preset threshold value, reactive power increased according to a first preset rate is injected into the tail end of the rural power grid, and the ratio of line resistance to reactance of the rural power grid is larger than 1; in the process of injecting the reactive power to the tail end of the rural power grid, obtaining the voltage of the load side of the tail end of the rural power grid according to a preset time interval, and if the first difference value is smaller than a second preset threshold value and larger than a second difference value and the second difference value is larger than 0, controlling the magnitude of the injected reactive power to be unchanged, the first difference value is the difference value between the voltage obtained for the (i + 1) th time and the voltage obtained for the ith time, and the second difference value is the difference value between the voltage obtained for the (i + 2) th time and the voltage obtained for the (i + 1) th time, so that the voltage of the load side at the tail end of the rural power grid is always kept in a target state; and the dynamic balance between the power supply capability and the power demand is realized.

This disclosure provides a distributed control method and system for DC microgrids based on optimal power generation cost, relating to the field of distributed control technology for DC microgrids. Distributed control is achieved through controllers installed in each converter. Specifically, the method involves: acquiring operating data from adjacent converters to estimate global information of the DC microgrid; estimating the optimal current value based on the global information, and calculating the adaptive droop gain in real time using the optimal current value; compensating for voltage deviation based on the calculated adaptive droop gain and the line resistance of each converter to obtain the compensated bus voltage; and performing droop control and secondary voltage regulation control on the DC microgrid based on the adaptive droop gain and the compensated bus voltage to ensure that the output current of each converter tracks the optimal current value in real time, ensuring that the bus voltage remains stable at its rated value. Even under resistive load variations, this invention can still guarantee the optimal output current of each distributed converter, ensuring minimum power generation cost and achieving voltage stability.

The utility model relates to the technical field of thermal printing head manufacturing, in particular to a novel heating substrate for a thermal printing head, which can improve the quality of a silver public electrode in a thermal printing head product, reduce the wire resistance of the silver public electrode and improve the binding force of the silver public electrode and a ground coat layer on the premise of not damaging the ground coat. A mass density transition layer is further arranged between the common electrode and the ground glaze layer, and the area of the mass density transition layer is larger than that of the common electrode. Compared with the prior art, the problem that the silver common electrode and the ground glaze layer are mutually infiltrated due to high sintering during preparation can be effectively prevented; and therefore, the purposes of reducing the silver electrode wire resistance and improving the product reliability and quality are achieved.

The present application relates to the technical field of automatic guided vehicle power supply control and intelligent power distribution, and particularly relates to a mobile robot intelligent multi-channel controllable power distribution system and a short circuit protection method thereof, the system comprising: a sensing module, which collects environmental temperature and humidity, circuit board surface temperature, power supply channel input voltage and power supply channel output current, and receives target demand current to generate a set of operating parameters; a dew point calculation module, which calculates air dew point temperature based on the set of operating parameters. In the present application, by correlating multi-dimensional parameters such as environmental temperature and humidity, line resistance change, transient voltage drop and mechanical transmission resistance, the system can dynamically adjust the protection boundary by comprehensively considering the physical environment state and electrical operation data, reducing the difficulty in distinguishing between environmental interference and real electrical fault due to the use of fixed protection threshold, and improving the overall power supply stability of the automatic guided vehicle in complex scenarios such as temperature difference alternation and load mutation.

Vehicle comprising a first partial electrical system (1) with a first electrical energy storage device (E1), a starter (S) and a generator (G) and a second partial electrical system (2) with a second electrical energy storage device (E2), and wherein the first partial electrical system has an electrical line resistance (R1) between the generator and the first electrical energy storage device, - the first sub-network and the second sub-network can be coupled via an electrical path (3), - the electrical path has a coupling resistance (R2), and - the coupling resistance is greater than the line resistance, where - the electrical path has a first coupling element (S1), and - the first coupling element is electrically connected in series with the coupling resistor, wherein - the vehicle has an engine stop-start function, and - when the starter is activated for a warm start, the first coupling element is open, and wherein - the first sub-network includes at least one high-power consumer (V1), and - when at least one high-performance consumer makes a power demand, the first coupling element is open.

The utility model relates to the field of detection equipment, in particular to a detection device and current detection equipment. The detection device comprises a substrate, a sampling resistor and a plurality of reserved bonding pads. The plurality of reserved bonding pads are arranged on the substrate, the plurality of reserved bonding pads are connected in parallel, and at least one reserved bonding pad is welded with a sampling resistor; the reserved bonding pad comprises bonding pad assemblies which are oppositely arranged; the bonding pad assembly comprises a first bonding pad and a second bonding pad which are arranged at an interval; the first bonding pads of the bonding pad assemblies on the same side are connected with each other and are used for connecting a circuit to be detected; the second bonding pads of the bonding pad assemblies on the same side are connected with each other and used for being connected with a voltage detection line. One end of the sampling resistor is connected with the first bonding pad and the second bonding pad of the bonding pad assembly on one side of the reserved bonding pad, and the other end of the sampling resistor is connected with the first bonding pad and the second bonding pad of the bonding pad assembly on the other side of the reserved bonding pad. According to the detection device provided by the invention, the influence of the line resistance of the reserved bonding pad which is not welded with the sampling resistor on voltage detection can be avoided, so that the detection precision is improved.

The present invention discloses a sensor that integrates strain and temperature measurement. The sensor comprises a strain sensing unit, connecting leads, a flexible substrate, and a covering layer. The strain sensing unit and connecting leads are attached to the flexible substrate, and the covering layer seals the strain sensing unit and connecting leads. The connecting leads are connected to the strain sensing unit and include a first lead, a second lead, and a third lead. The second lead and the third lead are connected to the same output pin of the strain sensing unit. The sensor's first, second, and third leads form a three-wire measurement system, eliminating errors caused by line resistance and line strain due to excessively long leads. This allows for both temperature measurement and, using the measured temperature, compensation for temperature errors during strain measurement, further improving the sensor's measurement accuracy.

The purpose of the present invention is to provide a copper-containing silver powder capable of reducing line resistance of a conductive film. The present invention pertains to a copper-containing silver powder. In a differential curve of a TMA curve from 100°C to 600°C obtained by thermomechanical analysis in which the temperature of the copper-containing silver powder is raised at a temperature increase rate of 10°C / min, the copper-containing silver powder has an expansion peak and has, on the lower temperature side from the expansion peak, a first shrinkage peak at which the dTMA is -0.10% / min or less.

The utility model belongs to the technical field of low-voltage electric appliance detection, and particularly discloses a time constant suppression device of a direct-current short-circuit power supply, which comprises the direct-current short-circuit power supply, a compensation circuit and a test output circuit are electrically connected between the output end of the direct-current short-circuit power supply and a GND (ground), and the compensation circuit is connected with the test output circuit in parallel; the compensation circuit comprises a compensation circuit inductor, a compensation circuit resistor and a compensation capacitor which are connected in series; and the test output circuit comprises a line control switch and a test product access terminal which are connected in series. On the basis of the direct-current short-circuit power supply, the compensation circuit is connected in parallel, so that the time constant of the traditional direct-current short-circuit power supply can be suppressed, the inductance of the direct-current short-circuit power supply is equivalently reduced, the rise rate of the current in the initial stage is improved, and short-circuit current with smaller time constant is provided for the tested vehicle-mounted relay and fuse; and the short-circuit working condition test of the relay and the fuse for the electric vehicle is satisfied.

The invention provides a load balancing and voltage compensation method and device based on an electromagnetic element, and the method comprises the steps: controlling a zero-sequence current filter connected in parallel with a low-voltage power distribution network line, blocking the zero-sequence fundamental current and zero-sequence higher harmonic current of a load from flowing into a zero line, transferring the preset part of the maximum phase current in the three-phase load to the other two phases, reducing the maximum phase current and the line resistance voltage drop; controlling the three-phase multi-stage split-phase switched capacitor bank, compensating the reactive power of the line and reducing the negative sequence component of the current of the line, so that the current of the three-phase line reaches a preset balance degree value; reducing the overvoltage of the other two phases, increasing the voltage corresponding to the maximum phase current, and preventing the bidirectional out-of-limit of the voltage of the three-phase unbalanced load; and controlling a remote communication module to remotely monitor the running states of the zero-sequence current filter and the three-phase multi-stage split-phase switched capacitor bank. The stability and the electric energy quality of the power distribution network can be effectively improved.

The application belongs to the technical field of electric power, and provides a DC micro-grid system and a secondary control method of the DC micro-grid. The voltage compensation module, the droop control module, the steady-state current distribution compensation module, the dynamic current distribution compensation module and the voltage and current loop control module of the DC micro-grid system work cooperatively to ensure the accurate distribution of load current among different distributed power generation units, and improve the power quality and robustness of the DC micro-grid. The DC micro-grid system introduces compensation voltage to be used for bus voltage recovery and offsetting the influence of line resistance on the steady-state current distribution accuracy. The voltage and current loop control module adopts a cascaded voltage and current loop control mode to ensure that the output voltage of the distributed power generation unit converter closely tracks the reference output voltage, so as to realize the accurate distribution of load current among the distributed power generation units and improve the power quality of the DC micro-grid.

The invention discloses a low-voltage online resistance tester, which relates to the technical field of power equipment detection and comprises a high-precision sampling module, a power supply module, a temperature detection module, an LCD display module, a control and data processing module, a system clock module and a communication module. The low-voltage on-line resistance tester is a measuring instrument specially designed for electric power of a molded case circuit breaker, a relay, a contactor and the like, solves the problem that in the prior art, off-line measurement cannot meet the requirement for non-power-cut operation of a distribution network, and can perform high-precision wide-range resistance measurement between contacts when tested equipment is in an electrified state; therefore, the operation is convenient and fast.

The utility model provides a gun head line detection device, relates to the technical field of detection devices, and aims to solve the technical problem that a gun head line needs to be detected in the production process of a charging gun in the prior art. A gun head line detection device comprises a rack, a first connecting base, a micro-resistance tester, a safety tester and a control system, the first connecting base is connected to the rack and connected with at least two first sockets used for being connected with a gun head, the micro-resistance tester is connected to the rack, the safety tester is connected to the rack, and the control system is connected with the micro-resistance tester. The control system is electrically connected with all the first sockets, the micro-resistance tester and the safety tester; the control system selects the micro-resistance tester to carry out micro-resistance testing on each line, and if the resistance value of the line resistor is smaller than a set value, wiring is correct; and then the control system selects the safety tester to test the insulation resistance of each line, and if the insulation resistance is greater than a set value, the line is not damaged.

The invention discloses a line resistance compensation method for long-line transmission of a magnetic flux cable force sensor, and the method comprises the steps: installing the magnetic flux cable force sensor at a working measurement point for detection, adjusting a magnetic induction voltage signal outputted by the magnetic flux cable force sensor through a signal conditioner, and transmitting the magnetic induction voltage signal to a data processing system for processing through a high-speed analog-to-digital converter; the data processing system adopts a least square polynomial to fit the signal, and obtains a quantization integral value of a working measurement point; and taking the obtained quantized integral value of the working measurement point as an interpolation point, realizing optimization of the quantized integral of the working point by using a bilinear interpolation algorithm, and solving the relative permeability and the stress value of the working measurement point according to the optimized quantized integral value of the working point. According to the invention, the problem that the accuracy of cable stress measurement is influenced by factors such as sensor signal noise and cable impedance is solved, and the measurement precision of magnetoelastic effect stress detection of the magnetic flux cable force sensor is improved.

The invention relates to the technical field of electric signal processing, in particular to an impedance model construction method and system of a new energy flexible low-frequency sending-out system. The method comprises the following steps: recording real-time timing sequences of voltage and current of a converter bridge arm under different working conditions; extracting a time interval between the voltage peak value and the current peak value, a voltage waveform slope change rate and a current waveform oscillation period, and labeling corresponding working condition labels to form a bridge arm dynamic feature library; and identifying the voltage waveform and the current waveform of the converter bridge arm, and synchronously recording the line resistance and the line reactance between the converter stations. According to the invention, through integration of the bridge arm dynamic features, construction of the bridge arm dynamic feature library and high-frequency correction cooperation, adaptive optimization of bridge arm parameters and construction of the impedance model of high and low frequency bands are realized, so that the matching efficiency of the impedance model is improved.