335 results about "Dc resistance" patented technology

The invention discloses a lithium battery dynamic heat generation power calculation method for stabilizing new energy power fluctuation, and belongs to the technical field of power system energy storage. According to the method, clustering analysis is carried out on new energy historical output data based on an improved K-means algorithm of a contour coefficient method, and a typical output scene is extracted; taking the condition that the fluctuation rate of the new energy grid-connected power meets the fluctuation rate constraint as an optimization target, performing decomposition and reconstruction on the typical output scene by adopting an adaptive wavelet packet decomposition algorithm, and determining an expected grid-connected power instruction; based on the expected grid-connected power instruction, rated power configuration and rated capacity configuration are considered, and an energy storage configuration model is constructed and solved; and solving a charge state calculation formula at each moment in the operation cycle, respectively constructing a function relation expression of dynamic change of the direct current resistance and the working current with the charge state, and further calculating the dynamic heat generation power of the lithium battery through a Bernardi heat generation rate formula. And characterizing a characteristic mapping relation among the dynamic heat source, the charge state and the time through a lithium battery dynamic heat generation formula.

The invention relates to the technical field of electrical performance testing, in particular to a method and system for measuring loss of an inductance winding, and the method comprises the following steps: applying a direct current to a measured inductance winding, synchronously monitoring the temperature, and multiplying a pre-measured direct current resistance value by a direct current value to obtain a direct current loss power value. The direct current is applied to the inductance winding, the temperature is monitored synchronously, the direct-current loss power is obtained by combining the direct-current resistance value and the current value, the temperature curve in the initial stage is extracted, the temperature rise rate is calculated, and therefore the winding heat capacity parameter is obtained, loss measurement can be closely associated with thermal response, and the measurement accuracy is improved. Introduction of a heat capacity factor is added in loss calculation, dynamic characteristics of a winding material on a thermodynamic level can be reflected, instantaneous current with load step change is applied after an inductor is cooled, an instantaneous loss power curve is generated by collecting a voltage sequence and a current sequence at the same time, and loss calculation is not limited to average value or steady state measurement any more.

The invention provides a method for testing breakage of a film covered wire. The method comprises the following steps of: 1, respectively sampling a section of a wire with the length of 1m and a section of a wire with the length of 10m; step 2, respectively measuring weight values and direct-current resistance values of the 1-meter sampling line and the 10-meter sampling line to obtain a weight value G1 of the 1-meter sampling line, a direct-current resistance value R1 of the 1-meter sampling line, a weight value G2 of the 10-meter sampling line and a direct-current resistance value R2 of the 10-meter sampling line; step 3, calculating the direct current resistance change rate according to a formula delta R = {R2 / [R1 * (G2 / G1)]-1} * 100%; 4, when the direct-current resistance change rate delta R is smaller than a set percentage, the wire is judged to be qualified; and when the direct-current resistance change rate delta R is greater than or equal to a set percentage, judging that the wire has the wire breakage defect. According to the invention, the resistance abnormity caused by broken line and non-broken line factors can be effectively distinguished, and the misjudgment rate is reduced; and meanwhile, quantitative line breakage degree evaluation can be realized, and a technical basis is provided for formulating an industrial line breakage detection standard.

The invention relates to the technical field of electric power, in particular to a grounding grid state evaluation method and system based on a three-dimensional direct-current resistance matrix, accurately reflects the conduction state of each node of a grounding grid through multi-point measurement, is suitable for fine detection of a complex grounding grid, and particularly is suitable for large-scale water conservancy and hydropower engineering. Fault points or weak links can be positioned; the matrix test comprehensively covers all nodes and paths of the grounding grid, so that no omission is ensured, and a fault or corrosion area of the grounding grid can be accurately positioned; in addition, data provided by testing are rich, deep analysis and trend prediction are facilitated, early warning can be carried out, potential hazards can be found in time, and measures can be taken. The method has the advantages of high anti-interference capability, simplicity and convenience in operation, low cost and suitability for large-scale application, can provide a stable and reliable detection result especially in an electromagnetic complex scene, and is beneficial to long-term monitoring and data analysis.

The invention relates to a transformer direct current resistance tester. The transformer direct current resistance tester comprises a box body, an operation panel and a wiring terminal arranged on the operation panel, the limiting mechanism is used for limiting pulling-out of the detection line; the driving mechanism is used for controlling the limiting mechanism to contact and limit the detection line; the limiting mechanism comprises a limiting plate which is movably arranged on the operation panel; the transmission assembly is used for controlling the movement direction and position of the limiting plate; the wiring port and the detection port are both arranged on the limiting plate, the end part of a detection line penetrates through the wiring port to be connected with the wiring end, and the detection port is used for the detection line to penetrate through; the transmission assembly is used for enabling the detection opening in the limiting plate to move to the position above the end of the detection line. According to the invention, the detection line is limited, so that the effect of improving the safety performance after external power failure is achieved.

The invention discloses a high-performance ship cable and a preparation process thereof, relates to the technical field of cables, and aims to solve the problem that an existing cable is insufficient in environmental adaptability, safety, electromagnetic compatibility and the like, the cable comprises a conductor, an insulating layer, a longitudinal waterproof structure, a shielding layer and a sheath layer from inside to outside, the conductor is of a multi-strand soft copper wire stranded structure, and the copper content of the multi-strand soft copper wire stranded structure is larger than or equal to 99.95%; the DC resistance at 20 DEG C is less than or equal to 0.01724 omega mm / m; the insulating layer is made of cross-linked polyethylene or polytetrafluoroethylene and can resist 1.5 times of rated voltage for 1 minute without breakdown; the longitudinal waterproof structure comprises a water-blocking tape and water-blocking paste; the shielding layer is of a double-layer structure, and the shielding effectiveness is larger than or equal to 60 dB The sheath layer is made of a low-smoke halogen-free flame-retardant material and contains an antioxidant and an ultraviolet light absorber, the preparation process comprises six steps of conductor preparation, insulating layer forming and the like, parameters are accurately controlled, the cable can work at the temperature of-40 DEG C to 85 DEG C, is salt-fog-resistant, waterproof and flame-retardant, is adaptive to the complex environment of ships and warships, and the operation reliability and safety are improved.

The invention relates to the technical field of power testing, in particular to multifunctional comprehensive test conversion integrated equipment which comprises a conversion integrated device and test instrument connecting line, a conversion integrated device and a multifunctional comprehensive test line. The conversion integration device and test instrument connecting line is used for connecting the conversion integration device and a test instrument; the conversion integrated device is used for quickly adapting to different test instruments and tested equipment and discharging before and after a test; and the multifunctional comprehensive test line is used for connecting the conversion integrated device and the tested equipment. Test items supported by the device are insulation resistance, dielectric loss capacitance, direct current resistance, transformation ratio and demagnetization tests, all power failure routine test items of the transformer can be completed without replacing a test line, the time of the power failure routine test of the transformer and the frequency of high-altitude operation can be obviously reduced, the working efficiency is greatly improved, and the test cost is reduced. And the safety risk in the test operation process is reduced.

An electronic package is provided, in which an electronic component with a conductive layer on an outer surface thereof is embedded in an encapsulant, where at least one electrode pad is disposed on an active surface of the electronic component, and at least one wire electrically connected to the electrode pad is arranged inside the electronic component, so that the conductive layer is electrically connected to the wire, such that the electrode pad, the wire and the conductive layer are used as a power transmission structure which serves as a current path to reduce DC resistance and improve an impedance issue associated with the supply of power.

The invention discloses a positive electrode active material and a preparation method thereof, a positive electrode plate, a battery and a power utilization device, the positive electrode active material comprises an inner core and a coating layer, the inner core comprises a transition metal oxide, the coating layer is formed on the surface of the inner core, the coating layer comprises a polymer containing a silicon-oxygen bond, and the polymer is formed on the surface of the inner core. Based on the total mass of the positive electrode active material, the mass ratio of silicon in the polymer is 0.05%-1%. The positive electrode active material disclosed by the invention has relatively high stability, so that the cycle performance and the direct-current resistance of the battery under high voltage can be improved.

The invention relates to the technical field of motor test equipment, in particular to a multifunctional motor test operation system and method, and the method comprises the steps: a parameter detection module synchronously collects voltage, current, frequency, temperature, vibration, insulation resistance and DC resistance parameters, and converts the parameters into electric signals; the data processing module carries out amplification, filtering and analog-to-digital conversion on the electric signal to obtain a measured value; the storage module stores the measured value; and the report generation module automatically generates a test run report containing parameter analysis and qualification conclusions through a preset template based on the stored value. The parameter detection module synchronously collects various parameters and converts the parameters into electric signals, the data processing module processes the signals to obtain accurate measured values, the storage module stores data, and the report generation module automatically generates a test run report containing analysis and conclusion based on the stored values. The problems that the function is single, data integration is difficult and report generation is tedious are solved, the testing efficiency and accuracy are remarkably improved, and manual errors are avoided.

The utility model belongs to the technical field of detection equipment, and discloses mining special cable bending test equipment, which comprises a workbench, a direct current resistance tester, a PLC (programmable logic controller) electrical control unit and a PC (personal computer) control unit are mounted on the workbench, a driving mechanism is mounted on the workbench, a driving belt wheel is mounted at the output end of the driving mechanism, and the driving belt wheel is driven by a motor. The driving belt wheel is in transmission connection with a driven belt wheel, a rotating shaft is installed at the axis of the driven belt wheel, and rotating teeth are installed on the rotating shaft; the workbench is provided with two fixed pulley assemblies and a movable pulley assembly, and the movable pulley assembly is located between the two fixed pulley assemblies. By the adoption of the structural design, the corresponding bending wheels can be selected according to different cable models, the bending strength and bending plastic deformation of the cable are larger, working condition simulation is closer, and relevant detection data can be obtained on line in real time.

The invention discloses a cable core through-flow efficiency detection method and device, and belongs to the technical field of distribution network cables, and the method comprises the steps: obtaining a to-be-detected cable sample; respectively measuring the sample total volume of the to-be-measured cable sample and the cable core volume of the to-be-measured cable core by using an equivalent volume replacement method; measuring the cable length and the adhesive tape volume of the cable core to be measured; calculating the cross-sectional area of the through-flow cable based on the sample total volume, the adhesive tape volume and the cable length; calculating a compression coefficient based on the cross-sectional area of the through-flow cable and the structural parameters of the cable core to be measured; calculating a conductive cross section ratio based on the sample total volume, the wire core volume and the adhesive tape volume; calculating a direct-current resistance coefficient based on the nominal sectional area of the cable core to be measured and the sectional area of the through-flow cable; and detecting the cable core through-flow efficiency of the to-be-detected cable sample according to the compression coefficient, the conductive cross section ratio and the direct-current resistance coefficient. Therefore, by implementing the method, the problem that the conductivity of the cable is difficult to accurately represent in the prior art can be solved.

The invention relates to an electrocoagulation guide wire and an electrocoagulation guide wire system. The electrocoagulation guide wire comprises a core wire body, a sheath and a coating, the core wire body is sleeved with the sheath, the coating is arranged on the sheath and part of the core wire body, the core wire body comprises a far-end section and a near-end section which are connected with each other from the far end to the near end, the far end of the far-end section is further provided with an electrocoagulation area, and the electrocoagulation area is arranged between the far-end section and the near-end section. The electrocoagulation guide wire is characterized in that the sheath and the coating are not arranged in the electrocoagulation area, under a 500V voltage test, the insulation resistance of the coating of the electrocoagulation guide wire or any point on the sheath which is not covered by the coating is not less than 10megohm, and the direct-current resistance of the electrocoagulation guide wire is less than 20ohm. According to the electrocoagulation guide wire, thrombus escape caused by thrombus formed by electrocoagulation outside aneurysm can be avoided, the risk of postoperative cerebral infarction is reduced, the operation safety is improved, and damage to materials of the electrocoagulation guide wire in the electrocoagulation process can be avoided.

To provide a negative electrode for a non-aqueous electrolyte storage element that can achieve both a low internal resistance (DC resistance) and a high capacity retention rate after charge / discharge cycles for the non-aqueous electrolyte storage element, and a non-aqueous electrolyte storage element that achieves both a low internal resistance (DC resistance) and a high capacity retention rate after charge / discharge cycles.SOLUTION: A negative electrode for a non-aqueous electrolyte storage element according to an embodiment of the present invention includes a negative electrode active material layer containing a carbon-based active material, a cellulose derivative, and a layered silicate, and the content of the cellulose derivative in the negative electrode active material layer is less than 0.8 mass%.SELECTED DRAWING: Figure 1

The invention relates to the technical field of battery management, and discloses a copper bar looseness identification method and device, equipment and a medium, and the method comprises the steps: obtaining multi-modal data of a battery system; the multi-modal data comprises at least one of voltage, current and temperature and equivalent direct current resistance; determining a first looseness prediction result of the battery system based on the change rates of the at least two types of multi-modal data; calculating the outlier degree of each copper bar point location indicated by the first looseness prediction result; and according to the outlier degree of each copper bar point location, generating positioning information and a fault result of the copper bar point location. According to the scheme, the limitation of single signal diagnosis in the prior art is broken through, and the copper bar looseness is analyzed by voltage-impedance combination based on multi-modal characteristics, so that the accuracy and robustness of copper bar looseness detection are improved.

A circuit for providing temperature compensation to sense signals in a single-ended DC resistance (DCR) sensing network for a multiphase switching power supply includes a temperature compensation calculator circuit generating a compensation adjust signal indicative of a sensed temperature; a compensating impedance network receiving the positive sense signals for all the phases and generating a correction signal for each phase in response to at least the positive sense signal for each phase and the compensation adjust signal; an average circuit coupled to average the correction signals of all phases, where copies of the average correction signal are applied to modify the positive sense signals; and an amplifier circuit receiving a summed positive sense signal being the sum of the modified positive sense signals for all the phases and a summed negative sense signal to generate an output signal having substantially zero temperature coefficient over the first frequency range.

The invention relates to the technical field of electric power, in particular to a cable nondestructive testing method which comprises the following steps: acquiring corresponding calibration parameters from a database according to the model of a to-be-tested cable, and calculating the total length and fault position of the to-be-tested cable at the near end of the to-be-tested cable by adopting a time domain reflection method; at the tail end of the cable to be detected, at the tail end, at least two core wires are short-circuited, a four-wire detection method is adopted to measure the direct-current resistance of a core wire loop at the near end, and standard temperature correction is conducted on the direct-current resistance of a single core wire; the resistivity to be measured is calculated by using the total length of the cable to be measured, the actual cross sectional area of the core wire and the direct current resistance of the single core wire at the standard temperature, and whether the actual core wire material of the cable to be measured is qualified is analyzed according to the resistivity to be measured and a resistivity threshold value set based on the calibrated core wire material. And early warning is carried out based on a core wire material analysis result and a fault position. According to the method, the cable length, the fault position and the core wire material qualification can be quickly, nondestructively and accurately detected on site.

The invention relates to the technical field of cable detection, and discloses a cable DC resistance detection and material identification method and system, and the method comprises the steps: constructing a four-wire system low-impedance electrical connection of a cable sample, compensating and correcting the path measurement precision through contact resistance, and obtaining an optimized electrical connection; monitoring a load state and performing closed-loop regulation on load impedance to obtain high-stability direct current; performing high-precision differential signal conditioning on the original voltage signal to obtain purified voltage data; deriving an initial resistance measurement value based on the purification voltage and the high-stability direct current, and performing system error compensation calibration on the initial resistance measurement value through a reference resistance comparison mechanism to obtain a calibrated direct current resistance value; obtaining material identification reference data according to a pre-stored mapping relation between the material and the resistance value in a material resistance database; the range attribution of the calibration direct-current resistance value in the material identification reference data is judged, and the material type is identified; according to the invention, the efficiency of cable DC resistance detection and material identification can be improved.

The invention provides an intelligent interface matrix for an integrated test of a power transformer, and aims to simplify complex wiring operation in a traditional test and improve the automation level and the working efficiency of test wiring of the power transformer. The intelligent interface matrix is composed of an intelligent control module, a test interface unit and a sensing monitoring module, and supports wiring tasks of conventional tests of dielectric loss, excitation characteristics, loop resistance, primary and secondary DC resistance of a current transformer, transformation ratio, dielectric loss, insulation resistance and the like of a voltage transformer. Signals such as voltage and current in a test are monitored in real time, the intelligent interface matrix automatically identifies the type of the power transformer, a test sequence is preset according to different types of transformers, a plurality of adjustable test interface units are stably and safely switched in a high-voltage and large-current environment, various test wiring work is efficiently and rapidly completed, and the test efficiency is improved. Manual intervention is remarkably reduced, and the test safety, reliability and overall working efficiency are effectively improved.

The application relates to the technical field of lightning protection equipment manufacturing, and discloses a composition for preparing a high-stability direct-current resistance sheet, the high-stability direct-current resistance sheet, a preparation method and application thereof. The composition contains the following components: ZnO, Bi2O3, Sb2O3, Co2O3, MnO2, Cr2O3, SiO2, NiO, SnO2, BN, Al(NO3)3.H2O and silver glass powder. The resistance sheet prepared by using the composition has high stability. In addition, the method can avoid resistance sheet grain coarsening, increase the non-uniformity of the internal microstructure and increase the number of pores; the excellent basic electrical performance of the direct-current resistance sheet can be ensured. Meanwhile, the method can make the electrical performance change of the resistance sheet under current impact and the continuous direct-current electric field smaller, and the performance is more stable.

The utility model discloses a new energy automobile copper clad aluminum braided shield high voltage cable in the technical field of high voltage cable, including stranded copper conductor, the fixed extrusion of insulating layer has on the outer wall of stranded copper conductor, the insulating layer is cross -linked polyethylene or cross -linked polyolefin insulating layer, the insulating layer outside fixedly set semiconductive inner layer, fill in the PP filling strip between semiconductive inner layer with insulating layer, the outer wall of semiconductive layer extrudes and has copper clad aluminum braided shield layer, copper clad aluminum braided shield layer is 0.1~0.2 tinned copper clad aluminum wire, and with semiconductive inner layer is 360 degree ring pressure contact, the outer wall of copper clad aluminum braided shield layer fixed extrusion has aluminum foil layer, the outer wall of aluminum foil layer fixed extrusion has semiconductive outer layer, the outer wall of semiconductive outer layer fixed extrusion has cross -linked polyolefin sheath, the utility model discloses can reduce the shielding layer direct current resistance, guarantees the continuity of grounding, promotes high -frequency shielding efficiency, strengthens in 100kHz~30MHz frequency band shielding attenuation.

The application discloses a kind of on-load voltage regulating transformer DC resistance measurement method and measuring device, method includes: the current of each phase winding of transformer in the same gear state is sampled at multiple time to obtain first sampling current data, based on the time constant estimation value of each phase winding of first sampling current data;Select the sampling current value of several continuous sampling time in first sampling current data as second sampling current data, based on the current stability of second sampling current data to obtain the DC resistance estimation value of each phase winding;First sampling current data is fitted and is obtained by iteration The optimized best DC resistance value of each phase winding is as the DC resistance measurement value of corresponding winding.The application can effectively avoid the shortcomings of long measurement time, high measurement time point requirement and large measurement result error, improve the accuracy and reliability of DC resistance measurement, suitable for DC resistance measurement of various transformers, with wide application scenarios.

A resistance calculation device includes: a characteristic calculation portion configured to calculate a shrinkage rate for each single electrode based on a capacity shift amount of a positive electrode of a deteriorated secondary battery, a capacity shift amount of a negative electrode of the deteriorated secondary battery, a deterioration amount of the positive electrode, and a deterioration amount of the negative electrode, and to calculate a curve representing characteristics of a state of charge and an open circuit voltage of an equivalent circuit of the deteriorated secondary battery by deforming an opening end potential curve for each single electrode before deterioration of the deteriorated secondary battery by the shrinkage rate for each single electrode based on a fixed point; a change amount calculation portion configured to calculate an amount of change in the open circuit voltage of the equivalent circuit based on a difference between the opening end potential curve for each single electrode before the deterioration and the curve representing the characteristics of the state of charge and the open circuit voltage of the equivalent circuit; and a resistance calculation portion configured to calculate a DC resistance of the equivalent circuit by dividing a result of addition of an amount of change in a DC voltage of the equivalent circuit to which a pulse current is applied and the amount of change in the open circuit voltage of the equivalent circuit by a current value when the pulse current is applied to the equivalent circuit.

The embodiment of the invention provides a method and device for determining filter inductance parameters of a switching power supply conversion circuit and a medium. The method comprises the following steps: setting two ends of an output filter capacitor at the output end of a switching power supply as sampling points and connecting a radio frequency connecting line to lead a ripple signal out of a high-low temperature test box for measurement, so that an output voltage ripple amplitude at a preset temperature can be accurately obtained under the condition that the high-low temperature test box is not opened; when the ripple exceeds a preset output ripple amplitude, a magnetic ring winding inductor is installed at the position of an output filter inductor, and the number of winding turns and / or the length of a wire are / is adjusted to adjust an inductance value and a direct-current resistance parameter, so that an output filter inductor parameter meeting a ripple index is rapidly determined; the problems that in the prior art, measurement and adjustment cannot be conducted at the same time in the high and low temperature environment, dead halt and restart are easily caused by large ripples in the mass production stage, and the repeated revision cost is high are solved.

The invention belongs to the technical field of batteries, and particularly discloses a secondary battery, a preparation method thereof and a power utilization device. The secondary battery comprises a positive pole piece, an isolating membrane and a negative pole piece, the positive pole piece comprises a positive current collector and a positive membrane layer located on at least one side surface of the positive current collector, the positive membrane layer comprises a positive active material, a carbon nanotube, graphene, hydrogenated butadiene-acrylonitrile rubber and a modified compound of the hydrogenated butadiene-acrylonitrile rubber, and the graphene has a sheet structure. A carbon nano tube is connected between the graphene with the sheet structure, and a plurality of holes are formed in the surface of the graphene with the sheet structure. According to the design mode provided by the invention, the direct-current resistance of the battery is reduced by improving the conductivity of the pole piece.

The application discloses a flyback transformer winding loss evaluation method, device, equipment and storage medium, and the method comprises the following steps: acquiring electrical data in a preset switching period, and actual primary side current waveform and actual secondary side current waveform of a to-be-tested flyback transformer under the electrical data, and constructing a current calculation model to obtain a primary side current change function and a secondary side current change function; then, the primary side current change function and the secondary side current change function are subjected to Fourier decomposition to obtain a primary side DC component, a primary side harmonic component, a secondary side DC component and a secondary side harmonic component; then, selected primary side harmonic components, selected primary side harmonic frequencies, selected secondary side harmonic components and selected secondary side harmonic frequencies are determined; subsequently, the primary side AC resistance, the primary side DC resistance, the secondary side AC resistance and the secondary side DC resistance of the flyback transformer are acquired; finally, the winding loss value of the to-be-tested flyback transformer is calculated. Through implementation of the application, the winding loss of the flyback transformer can be quantitatively calculated.

The embodiment of the application discloses a control method and device of an air conditioner air-sweeping motor, an air conditioner and a storage medium, and relates to the technical field of air conditioners. The method comprises the following steps: detecting a current voltage between the direct-current resistance; judging whether the current voltage is lower than a predicted voltage, wherein the predicted voltage is a winding temperature of a motor winding at a preset winding temperature, and is measured by detecting the voltage between the direct-current resistance; if the current voltage is lower than the predicted voltage, controlling the air-sweeping motor to slightly swing so that the winding temperature is higher than the preset winding temperature. When the current voltage of the direct-current resistance is lower than the predicted voltage, the heat generation is increased by controlling the slight swing of the air-sweeping motor, so that the winding temperature of the motor winding is increased, the winding temperature is ensured to be always higher than the preset winding temperature, and the effect of eliminating the internal condensation of the air-sweeping motor is achieved.

The utility model discloses an inductor structure, which comprises a magnetic core assembly, a magnetic core, a coil, a first coil, a second coil, a third coil, a fourth coil and a fifth coil, the coil body is arranged in the coil accommodating cavity, and the cross section of the coil body is rectangular; the base is connected with the magnetic core assembly and provided with two tin guide plates, the two tin guide plates are arranged in a central symmetry mode, the magnetic core assembly is made of alloy materials, the saturation magnetic flux density of the magnetic core assembly can be increased, the size of a coil containing cavity in the magnetic core assembly is increased, the cross section of the coil body is arranged to be rectangular, and the size of the coil containing cavity in the magnetic core assembly is increased. The direct-current resistance of the coil body can be reduced, so that the temperature rise current and the rated current are improved to meet the current requirement of a circuit.

The present disclosure provides a coil component having a structure capable of reducing DC resistance and floating capacity, and an electronic device including the same. A coil component (1) according to the present disclosure comprises: a first coil formed into a cylindrical shape by bending a rectangular first conductor in the long-side direction; a second coil formed into a cylindrical shape by bending a rectangular second conductor in the long-side direction; a first lead wire and a second lead wire; and a third lead wire and a fourth lead wire. The first lead wire is electrically connected to an input electrode. The second lead wire and third lead wire are electrically connected to an intermediate electrode. The fourth lead wire is electrically connected to an output electrode. The first coil and the second coil are disposed on a substrate so that a first winding axis of the first coil and a second winding axis of the second coil are substantially parallel to the substrate.

A conductor DC resistance testing device disclosed by the present invention comprises a detection table, a detection bridge, two first clamps and two second clamps, a cavity layer is arranged in the detection table, an S-shaped bent electric heating tube is arranged in the cavity layer, and wrapping covers used for wrapping the detection table after being folded are arranged on both sides of the detection table. First connecting lugs are arranged at the two ends of the wrapping cover, connecting holes are formed in the first connecting lugs, a rotating shaft penetrating through the connecting holes is arranged on the detection table, and a thermometer is arranged on the inner wall of the wrapping cover. After being combined, the two wrapping covers can wrap the outer side of the detection table, the electric heating pipes heat the space in the wrapping covers, meanwhile, the thermometers are used for monitoring the change of the temperature in the wrapping covers, and after the temperature is controlled to range from 15 DEG C to 25 DEG C and is stabilized for a period of time, conductor resistance testing can be conducted on the cable. And finally, the ambient temperature around the cable can be always controlled between 15 DEG C and 25 DEG C, so that the measurement accuracy can be improved.