6507 results about "Inductance" patented technology

The invention discloses an error compensation inductance sensor calibration method and system, and the method comprises the steps: controlling a macro-micro composite driving platform to drive a moving part provided with a to-be-calibrated inductance sensor, and enabling the moving part to carry out the continuous displacement movement relative to a fixed standard target surface; measuring the actual displacement of the moving part to obtain a standard displacement sequence; the actual output voltage of the inductive sensor to be calibrated in the movement process is synchronously collected, and an actual measurement value sequence is formed; solving measurement deviation, generating a measurement deviation sequence, and dividing the sequence into not less than three compensation intervals according to a displacement range; a compensation value lookup table is established in each compensation interval, and calibration parameters used for correcting zero offset, gain drift and nonlinear characteristics are generated. Displacement measurement and sensor output synchronous acquisition are combined, zero offset, gain drift and non-linear errors can be corrected in a targeted mode, and compensation fineness and adaptability are improved.

The invention relates to a power supply module which comprises an inductance circuit, a switch circuit, a check driving circuit and a controller, wherein the inductance circuit is provided with an inductor and a voltage feedback line, and the voltage feedback line feeds back the end voltage of the inductor. The switch circuit is electrically connected with the inductance circuit to drive the inductance circuit. The check driving circuit is electrically connected with the switch circuit and the voltage feedback line, and the check driving circuit controls the switch circuit and generates a current feedback signal according to the end voltage of the inductor. The controller is electrically connected with the check driving circuit, and controls the check driving circuit according to the current feedback signal.

The invention relates to the technical field of resonance suppression, and discloses an active damping control LC resonance suppression method and device. The method comprises the following steps: performing parameter identification processing based on bus voltage to obtain an inductance value, a capacitance value and a resonance frequency of an LC circuit; extracting a resonant current component of the current signal based on the resonant frequency; calculating damping power according to the resonance current component, and converting the damping power into a voltage compensation instruction under an alpha-beta coordinate system; generating a PWM control signal according to the voltage compensation instruction and a voltage reference instruction; and performing on-off control on the inverter based on the PWM control signal, and injecting power opposite to the resonant current component into the LC circuit to generate a virtual damping effect. Virtual impedance characteristics are seamlessly integrated into inverter control, rapid response of the whole process from resonance detection to power injection is ensured, the resonance peak value is effectively suppressed, and the current quality is improved.

A low voltage ride through control method for a grid-forming inverter based on dynamic internal potential adjustment comprises the following steps: detecting a voltage per unit value of a grid-connected point in real time, and comparing the voltage per unit value with a threshold value to judge a voltage drop event and trigger low voltage ride through control; dynamically calculating active and reactive power reference values through a reactive compensation equation and an active current limiting equation according to the voltage amplitude and the power reference value before falling during the ride-through period; inputting the active reference value into a virtual rotor motion equation to generate a reference phase, and outputting a phase reference signal in combination with a dual-mode phase compensation controller; superposing the reactive reference value with the reference voltage through a reactive voltage regulating ring to generate a voltage amplitude reference signal; synthesizing an internal potential according to the phase and the amplitude reference signal, and obtaining an inductive current reference value through virtual impedance control and current amplitude limiting; and finally, a driving signal is generated through the current inner loop controller and the modulation module. According to the invention, overcurrent can be effectively inhibited, rapid reactive power support is provided, and synchronous stability and smooth transition in a fault period and a recovery process are ensured.

The embodiment of the invention provides a closed-loop control method for power driving and protection, and the method comprises the steps: constructing a voltage feedback type circuit through a high-speed operational amplifier, and forming a closed-loop gain structure through a feedback network of the voltage feedback type circuit; the load current of the output end of the voltage feedback type circuit is monitored in real time, and when the load current exceeds a first set threshold value, a protection mechanism is triggered to turn off the output stage; the power-on surge current is limited through the soft start control circuit; phase information of a load reflection coefficient is obtained, an inductance / capacitance combination of the variable dynamic impedance matching network is selected according to phase information table look-up, inductance / capacitance parameters are switched through a relay, and the transmission standing-wave ratio between the power amplifier and a load is optimized; monitoring the temperature of the radiating fin of the power tube, and dynamically adjusting the resistance value of the feedback network; and performing cooperative control of short-circuit protection, over-temperature protection and surge suppression according to the priority. According to the embodiment of the invention, the performance bottleneck in a load fluctuation scene is broken through.

The invention discloses a system and method for measuring the opening and closing state of an electromagnetic valve, and relates to the technical field of electromagnetic valves.The method comprises the steps that after an electromagnetic valve control signal is triggered, dynamic inductance L at each moment t is obtained through real-time backstepping by means of a voltage and current sampling module integrated in a driving loop and an inductance analysis module in a local microcontroller MCU; gaussian filtering processing and derivative calculation are carried out on the dynamic inductance L in the edge calculation module, first-order derivative and second-order derivative characteristics are extracted, and an inductance mutation factor index Cimp is obtained through calculation. According to the method, clamping stagnation, rebound and discontinuous abnormal states occurring in the opening and closing process of the electromagnetic valve are comprehensively reflected, a sudden change threshold value Cthr is set and compared, and a set of dynamic opening and closing behavior diagnosis mechanism with high resolution and high adaptability is constructed. According to the method, high-frequency dynamic response extraction and abnormal trend quantification can be completed within 100 ms after the control signal is triggered, and the method has higher early warning capability and non-intrusive compatibility.

The invention relates to the technical field of servo control, in particular to a high-precision current closed-loop control system and method for a servo driver, and the method comprises the steps: collecting three-phase current, rotor position, winding temperature and bus voltage, and constructing a state data set; constructing a parameter identification model fusing physical prior and an attention mechanism, deducing inductance and flux linkage parameters influenced by temperature, saturation and cross coupling, and correcting a motor model in real time; the correction parameters are injected into an FOC decoupling and feedforward link, and a self-adaptive PI regulator is linked to set the gain of a current loop on line; calculating a d-q axis voltage command according to the update model to respectively control excitation and torque components; an extended state observer is introduced to estimate load abrupt change and parameter disturbance, feed-forward compensation is carried out, and three-phase PWM is generated through anti-Parker and SVPWM; and an inverter nonlinear compensation model of a dead zone and switch delay is constructed, PWM is pre-distorted and output to a power device, and robust and low-ripple current closed-loop control of the servo motor is realized.

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

According to the capacitance-enhanced circular isolator structure provided by the invention, common-ground electric connection is realized by forming a ground metal boss structure, the distance between a grounding metal and a multi-path impedance adding structure is remarkably reduced, the ground capacitance of the multi-path impedance adding structure is remarkably improved, and meanwhile, bandwidth expansion is realized through capacitance-inductance cooperative tuning; a second-order LC matching network is adopted in three radio frequency ports, a slotting part of a matching capacitor can enable a matching inductor and the matching capacitor to share space to a certain extent, so that the size of the matching network is effectively reduced, a first-order LC matching network is adopted in an absorption port, impedance matching of the absorption port is realized under the condition that only a single resistor is added, and the impedance matching performance of the absorption port is improved. The size of the matching network can be reduced while a good absorption effect is achieved, and the size of the non-reciprocal central junction structure can be reduced; in addition, the first non-reciprocal central junction structure and the second non-reciprocal central junction structure are subjected to conjugate matching by adopting an L-C-L type matching network, so that good isolation performance is realized.

The invention relates to a safe starting control method, device, equipment and medium for a bootstrap drive inverter, and the method comprises the steps: obtaining a detection voltage representing an output filter inductance voltage after responding to any starting event and before formally transmitting a drive signal; comparing the negative voltage with a preset negative voltage safety threshold value; only when the detected voltage is higher than the safety threshold, a driving enable signal is generated to allow the inverter to be normally started; otherwise, generating a driving blocking signal, carrying out detection and judgment again after waiting for preset time delay, and circulating the process until the system state enters the safe area; the method is realized by modifying a control algorithm, no power hardware needs to be added, the starting impact risk is eliminated with low cost, and the contradiction between the hardware limitation of a bootstrap drive circuit and the negative residual voltage possibly existing on the output inductance of the inverter is solved; therefore, the safety problem of direct connection between the impact current and the bridge arm during starting in an unfavorable initial state is solved.

The invention provides a mutual inductor loop resistance dynamic compensation correction method and device, and relates to the technical field of circuit testing, and the method comprises the steps: constructing a structural feature tensor and an environmental interference tensor according to the structural parameter information and environmental parameters of a primary winding and a secondary winding; training a dynamic compensation model based on the structural feature tensor, the environmental interference tensor and historical loop resistance test data; injecting a set direct current into the primary winding, obtaining an initial voltage signal sequence at two ends of the primary winding, and constructing a test state tensor in combination with the current loop current and the real-time environment parameters; inputting the test state tensor into the dynamic compensation model, and outputting a non-target resistance compensation value at the current moment; and based on the non-target resistance compensation value, correcting an initial loop resistance value obtained by calculating the initial voltage signal sequence to obtain a compensation resistance value of the target mutual inductor loop. According to the invention, the accuracy of mutual inductance loop resistance testing can be improved.

The invention discloses a buck-boost circuit-based mppt charging current backflow prevention control method, and relates to the technical field of switching power supplies, and the method comprises the steps: collecting a photovoltaic input voltage, a battery output voltage, and an inductive current flowing through an inductor; the current input power is calculated based on the photovoltaic input voltage and the inductive current, and the reference voltage is dynamically adjusted through an MPPT loop algorithm; pI voltage loop operation is carried out on the output voltage and the adjusted reference voltage, and expected charging current is generated; pI current loop operation is carried out on the expected charging current and the inductive current sampling value after proportionality coefficient adjustment, and a PWM duty ratio control signal is output to adjust the driving states of the four switching tubes; when the judgment circuit is in an intermittent conduction mode and meets critical conditions, a driving signal of the fourth switching tube is shielded, and only a body diode realizes a current path to prevent reverse flow of current; the battery current is effectively prevented from flowing backwards, and the system safety and the energy utilization efficiency are improved.

A power converter having an overvoltage protection mechanism is provided. A node between a second terminal of the high-side switch and a first terminal of a low-side switch is connected to an inductor. When an output current or an output voltage of the power converter must be released, the output current of the power converter flows to the input power source sequentially through the inductor, the high-side switch being turned on. Under this condition, when an overvoltage protecting circuit determines that a current or a voltage of the inductor or a current or a voltage of the input power source is larger than a threshold, the output current of the power converter flows to a ground through the overvoltage protecting circuit.

The invention relates to the technical field of power distribution network automation, and discloses an electrical variable monitoring method for ring main unit operation, which comprises the following steps: acquiring three-phase electrical variable data in response to a condition that a load current change rate exceeds a preset micro-motion excitation threshold value; calculating a reference voltage based on the circuit state equation containing the inter-phase mutual inductance coupling term; the method comprises the following steps: constructing a rotating coordinate system taking a current vector as a reference axis, performing vector decomposition on a voltage deviation vector, separating a resistive temperature drift voltage component parallel to the reference axis, and taking a nonlinear impedance voltage component perpendicular to the reference axis as a monitoring parameter to judge a contact state. According to the method, linear resistance drift caused by conductor temperature rise is effectively decoupled, baseline interference is eliminated, weak nonlinear impedance distortion characteristics caused by mechanical contact degradation can be captured, and the recognition sensitivity and accuracy of early latent faults of the ring main unit are improved.

The invention relates to the technical field of novel illumination, and discloses a wide-voltage light source intelligent control method integrated with a step-down regulation strategy, which comprises the following steps: establishing a mapping table of a voltage interval and a basic compensation slope; indexing a basic slope according to the real-time input voltage; extracting a load voltage direct current component representing the LED junction temperature to generate a thermal drift correction coefficient; dynamically reducing the target slope to match the natural attenuation characteristic of the inductive current; according to the invention, the junction temperature is reversely deduced through the voltage signal, a parameter self-calibration closed loop of a physical level is constructed, the phase margin of a control loop of a whole temperature range is locked under the condition of zero newly-added hardware cost, the problem of dynamic response hysteresis under a high-temperature working condition is solved, and the reliability of the system is improved. And the optical consistency of precise illumination is ensured.

A trans-inductor voltage regulator (TLVR) inductor module includes: a magnetic core; a first winding embedded in the magnetic core; a second winding embedded in the magnetic core and inductively coupled to the first winding; a third winding embedded in the magnetic core; a fourth winding embedded in the magnetic core and inductively coupled to the third winding; and a first integrated metallic connector that connects the second winding and the fourth winding in a series loop. A power electronics assembly that includes the TLVR inductor module is also described.

The invention belongs to the technical field of LLC resonant converters, and provides an efficiency optimization method of a wide-range LLC resonant converter. The method comprises the following steps: firstly, obtaining a full-bridge LLC resonant converter topology and a working area; secondly, establishing a full-time-domain equation of the full-bridge LLC resonant converter topology in an inductive low-gain output working area, and setting boundary conditions of the full-time-domain equation; then, on the basis of boundary conditions, switching tube turn-off current is calculated, and the switching tube turn-off current is combined with switching tube switching frequency to be represented as switching tube turn-off loss characteristic quantity related to the inductance coefficient, the quality factor and the normalized frequency; then, carrying out characteristic analysis on the turn-off current of the switching tube, and setting constraint conditions; and finally, on the basis of the set constraint conditions, the optimal values of the inductance coefficient, the quality factor and the normalized frequency are calculated by combining a differential evolution algorithm, so that the turn-off loss of the switching tube is minimum. According to the invention, the transmission efficiency in a low-gain mode and a high-gain mode can be improved, and the turn-off loss of the switching tube is reduced.

The invention discloses an LLC-DCDC fault protection method and device based on resonance current and pulse integration. The method comprises the following steps that an alternating current signal on an LLC converter resonance inductor is collected in real time through a resonance inductor current sampling circuit; inputting the current signal into a hardware comparator module, comparing the current signal with a preset current threshold value, and outputting a pulse signal; inputting the pulse signal into a pulse integral module for integral processing, and outputting an integral voltage signal; the CPU control unit receives a pulse signal output by the hardware comparator and an integral voltage signal output by the integral module in real time, and judges whether a fault occurs or not according to preset logic; and if the fault is judged, the driving signal of the primary inverter bridge of the LLC converter is cut off through the driving cut-off module.

The invention discloses a method for rapidly predicting the shape stability of a bird body emitted by a multistage electromagnetic coil, and the method comprises the steps: 1, inputting a structural parameter and an electrical parameter according to a bore-out speed requirement; 2, establishing a prediction model of the multistage electromagnetic coil transmitting device according to the parameters in the step 1; step 3, carrying out iterative calculation by adopting a forward difference method to obtain bird jerk after the cartridge case armature passes through the current-stage driving coil; 4, the bird body deformation stability in the current-level launching process is judged; 5, judging whether the armature displacement of the cartridge case meets the requirement or not, and if not, performing iteration at the current stage; if yes, executing the step 6; 6, setting the current, the mutual inductance and the mutual inductance gradient to be 0, and repeating the step 3 to carry out emission iterative calculation of the next-stage electromagnetic coil; 7, repeating the steps 4-6 until the prediction model reaches a preset out-of-bore speed; and step 8, outputting the final acceleration, displacement, speed and bird jerk curve of the cartridge case armature.

The invention discloses a superconducting magnet coil quenching detection method and a related device, and relates to the technical field of superconducting magnets, and the method comprises the steps: collecting the total voltage of two ends of a superconducting magnet coil and the current of any end of the superconducting magnet coil in real time in the operation process of a superconducting magnet; based on a relation curve that the inductance of the superconducting magnet coil changes along with the current, the resistive voltage in the superconducting magnet coil is determined through the total voltage at the two ends of the superconducting magnet coil and the current at any end of the superconducting magnet coil; when it is detected that the resistive voltage is increased to a voltage threshold value or the continuous increasing duration of the resistive voltage exceeds a duration threshold value, it is judged that the superconducting magnet coil is quenched; through the method, the problems that an existing superconducting magnet quenching detection method is complex and low in detection sensitivity are solved.

The invention relates to a low-loss multiphase inductance material which comprises a magnet and a winding, coils adjacent to the winding are wound in the reverse direction, meanwhile, the magnet extends out to form electrodes, and the magnet comprises Fe-based nanocrystalline and iron powder. The invention has the effect of reducing the loss of the inductance material.

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention relates to the technical field of self-synchronizing voltage source control, and discloses a balance current controlled self-synchronizing voltage source control method and system. The method comprises the following steps: acquiring and preprocessing operation data of a grid-connected inverter to obtain active / reactive components of voltage and current of a filter element; generating a three-phase terminal voltage instruction of the self-synchronizing voltage source based on the components, and determining a current instruction signal in combination with the grid-connected voltage; a three-phase modulation signal is generated through adjustment of a PIR controller and coordinate inverse transformation, then a filter inductance value is calculated according to the ripple characteristic of the modulation signal and a switching period, a filter capacitance value is determined by combining resonant frequency, and finally accurate control of the self-synchronizing voltage source is realized according to a filter parameter. By dynamically calculating the matching parameters of the filter inductance and the filter capacitance, the active regulation and control capability of the output impedance characteristic of the inverter is enhanced, and the resonance risk during the impedance change of the power grid is effectively inhibited. The technical problem that the stability is limited due to insufficient impedance regulation and control in the prior art is solved.

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.

In various embodiments of the invention, a cooled nuclear magnetic resonance (NMR) probe can utilize a sliding band capacitor which can be moved relative to a parent coil inner conductance tapered skirt to adjust the frequency of the parent coil to allow the parent coil to detect the resonance of at least two nuclei without requiring leads between the parent coil and a lock coil. In this manner a cooled NMR probe can be provided without the disadvantages of prior art cooled NMR probes. In an embodiment of the invention, the sliding band capacitor comprises a diamagnetic insulator with a first volume magnetic susceptibility, at least one paramagnetic metal with a second volume magnetic susceptibility and at least one diamagnetic metal with a third volume magnetic susceptibility, where the sum of the first volume magnetic susceptibility, the second volume magnetic susceptibility and the third volume magnetic susceptibility is approximately zero.

The embodiment of the invention relates to the technical field of energy storage, and provides an energy storage converter and an energy storage system thereof. The capacitor assembly and the inductor assembly are arranged on the two sides of the plate body assembly respectively; the two ends of the connecting assembly are electrically connected with the capacitor assembly and the inductor assembly respectively; and the heat dissipation assembly is provided with a heat dissipation air channel, and at least part of the capacitor assembly is located in the heat dissipation air channel, so that the problem of low working efficiency of an inductor and a capacitor in the energy storage converter in the prior art is at least favorably solved.

The invention relates to an ultrathin magnetic integrated transformer implementation method and device for LLC topology, and relates to the technical field of transformers, and the method comprises the steps: collecting a transformation application demand; generating a coil specification and a resonant inductance value according to a transformation application requirement; the primary coil, the secondary coil, the winding framework, the insulating insert and the magnetic core piece are selected according to the coil specification; generating an air gap depth value in combination with the resonant inductance value and the coil specification; generating gasket installation information according to the air gap depth value; winding the selected primary coil and secondary coil on a winding framework side by side, and mounting an insulating insert for separation; and adjusting a second magnetic column on the magnetic core piece according to the gasket installation information, and installing the preset magnetic core piece. The transformer has the advantage that the transformer can be conveniently used in ultra-thin application occasions.

The utility model discloses a single-stage and double-stage switching type circuit, which belongs to the technical field of electric energy conversion and comprises a first inductor, a second inductor, a third inductor, a three-phase rectifier bridge, a first control tube, a second control tube, a third control tube and a direct current regulation module, three input ends of the three-phase current bridge are respectively connected in series with the first inductor, the second inductor and the third inductor, and middle points of three bridge arms of the three-phase rectifier bridge are respectively connected with an input end of the direct current adjusting module after passing through the first control tube, the second control tube and the third control tube. The output end of the direct current adjusting module is connected with the load; according to the invention, the single-stage and double-stage rectification conversion circuit can be switched according to needs.