33 results about "Electromagnetic field coupling" patented technology

The invention provides a partial discharge detection system based on a Rydberg atom quantum coherence effect, and the system comprises an optical excitation module which is used for transmitting two-photon laser to excite hot atoms to enter a Rydberg state; the atomic gas chamber is used for accommodating hot atoms and is coupled with an electromagnetic field generated by the partial discharge signal, so that the hot atoms generate energy level response change under the action of the electromagnetic field; the detection light path module is used for detecting a change signal of light signal intensity in the atomic gas chamber and converting the change signal into an electromagnetic response characteristic of an electromagnetic field; the signal acquisition and processing module is used for receiving the electromagnetic response characteristics, demodulating and analyzing the electromagnetic response characteristics and extracting characteristic parameters of the partial discharge signals; and the control and calibration module is used for receiving the characteristic parameters of the partial discharge signal, performing calibration based on an energy level frequency shift rule of Rydberg atoms, and outputting electric field intensity subjected to quantization calibration. The system can realize high-sensitivity, anti-interference and traceable detection of weak partial discharge signals.

The invention provides a paper-based SERS (Surface Enhanced Raman Scattering) substrate based on ultrahigh-activity silver nanowires as well as a preparation method and application of the paper-based SERS substrate, and belongs to the technical field of surface enhanced Raman spectrum detection. Silver nanowires which are arranged in order are fixed on the surface of hydrophobic filter paper to regulate and control gaps of the silver nanowires so as to enhance the local electromagnetic field coupling effect, target molecules are induced to be enriched in situ by utilizing the hydrophobic characteristic of the hydrophobic filter paper, and a high-density Au / Ag heterogeneous interface is constructed on the surface of the etched silver nanowires in combination with aqua regia etching and AuNPs self-assembly technologies. The SERS signal intensity is further improved through the synergistic effect of bimetallic plasma resonance, the repeatability of the substrate is improved through neat arrangement of the silver nanowires, the stability is improved by wrapping the silver nanowires with the gold nanoparticles, the detection sensitivity of the paper-based SERS substrate is further improved, and the paper-based SERS substrate is low in preparation raw material price, can be manufactured in a large scale and is suitable for industrial production. The trace substances are very convenient to detect and can be taken at any time when being used.

Provided is a power distributor / combiner 1 that outputs an input microwave power after distributed or combined; the power distributor / combiner 1 including: a main body 10 that defines a radial waveguide 101 as a substantially cylindrical cavity; a center terminal 11 as an electromagnetic field coupling terminal, arranged in the radial waveguide 101 of the main body 10 while aligned with the center axis C of the radial waveguide 101; and a plurality of peripheral terminals 12 as electromagnetic field coupling terminals, arranged in the radial waveguide 101 radially away from the center terminal 11, and the radial waveguide 101 having a radius R smaller than a quotient of a free-space wavelength at a frequency of the microwave power, divided by 2.619.

This invention discloses a method and system for detecting partial discharge in the main transformer of a new energy power plant step-up substation, belonging to the field of power equipment testing technology. The method includes: establishing an electromagnetic field coupling model of the main transformer's operating conditions; acquiring real-time operating condition data, characteristic gas concentration signals, and multi-mode detection signals of the main transformer in the step-up substation; constructing a multi-mode signal feature vector; determining the first probability of partial discharge in the main transformer; determining the second probability of partial discharge in the main transformer; performing deep partial discharge diagnosis under operating condition fluctuation-sensitive fusion; and obtaining the diagnostic results of the main transformer's partial discharge. This invention solves the technical problems of existing technologies where the detection of partial discharge in the main transformer of a new energy power plant step-up substation is easily affected by operating condition fluctuations and has a single detection dimension, resulting in insufficient accuracy and stability of diagnostic results. It achieves accurate detection and multi-dimensional diagnosis of partial discharge in the main transformer of a new energy power plant step-up substation, improving the accuracy and stability of partial discharge detection.

The utility model discloses a microstrip patch antenna which comprises a dielectric substrate and a radiation patch. The radiation patch is arranged on the dielectric substrate, the radiation patch is E-shaped, the parallel edge of the E-shaped radiation patch is defined as a first sub-radiation patch, the vertical edge of the E-shaped radiation patch is defined as a second sub-radiation patch, and the length of the first sub-radiation patch is larger than or equal to 2.1 mm and smaller than or equal to 2.5 mm. The E-shaped structure enables the current to bypass between the first sub radiation patch and the second sub radiation patch, which is equivalent to increasing the electrical length of the radiation patch and reducing the resonant frequency of a fundamental mode, so that the low-frequency band bandwidth is broadened; the edges of the first sub-radiation patch and the second sub-radiation patch can generate strong electromagnetic field coupling to excite an additional parasitic resonance mode, so that the frequency band is further widened, and the bandwidth of the microstrip patch antenna is effectively widened. Wherein the first sub radiation patch of 2.1 mm to 2.5 mm enables the resonant frequency of the microstrip patch antenna to range from 43.7 Ghz to 55.1 Ghz, the relative bandwidth is 23%, and high bandwidth is achieved.

The application discloses a variable magnetic flux type magnetic coupler capable of realizing air cooling and liquid cooling heat dissipation, comprising a driving unit, a driven unit and a cooling liquid injection unit; the driving unit is connected with a power input end, the driven unit is connected with a power output end, the driving unit and the driven unit are respectively provided with corresponding conductors and permanent magnets, electromagnetic field coupling transmission is realized by using the conductors and the permanent magnets, and the adjustment of the magnetic flux is realized by adjusting the position of the permanent magnet; the cooling liquid injection unit comprises a cam transmission mechanism, a plunger pump and an injection mechanism; the cam transmission mechanism is connected with the power input end and moves synchronously with the power input end; the cam transmission mechanism is movably connected with plungers of the plunger pump, and the rotation is converted into the linear motion of the plungers by the cam transmission mechanism; the plunger pump is connected with the injection mechanism through a pipeline, and the cooling liquid is injected to the driving unit and the driven unit by the injection mechanism to cool the driving unit and the driven unit.

This application discloses a solid-state microwave source output power testing device, relating to the field of electrical variable testing. The device includes a power supply module, a mechanical adjustment component, and a light-emitting indicator component. The power supply module supplies power to the solid-state microwave source; the mechanical adjustment component adjusts the output power of the solid-state microwave source; and the light-emitting indicator component detects the output power of the solid-state microwave source. This application uses a mechanical method to adjust the output power of the solid-state microwave source and employs electromagnetic field coupling + light emission to detect the output power. This enables intuitive qualitative detection of the solid-state microwave source output power, has a simple structure and low cost, and the mechanical adjustment component and the light-emitting indicator component have low requirements for the testing environment.

The application discloses a kind of three-frequency co-aperture multi-beam antenna design method, device and system, and the forbidden area of three-frequency band radiator and lamination constraint are extracted by electromagnetic field coupling simulation, and initial layout condition is established;Subsequently, space topology optimization is carried out to determine the radiator layout and feed network structure, then polarization direction and excitation phase are jointly optimized to realize frequency band matching, finally, beamforming parameters are generated by multi-objective optimization, and finally, a three-dimensional model of co-aperture integration is constructed, so as to realize the collaborative design and optimization of three-frequency band antenna in limited space.The application can realize the collaborative improvement of multi-band high isolation, low coupling interference and multi-beam dynamic shaping capability.

The application discloses a terahertz ultra-wideband single-pole single-throw high-speed switch, and relates to a waveguide transmission line technology. The scheme is proposed for the high insertion loss and other problems in the prior art. A coupling line module is arranged for coupling connection between a signal input end and a signal output end; a switch module is arranged for turning on or turning off the coupling line module; the coupling line module is provided with a folded coupling line structure and a folded pseudo virtual line structure; the folded coupling line structure is used for signal coupling transmission; the folded pseudo virtual line structure is symmetrically arranged with the folded coupling line structure and is used for assisting electromagnetic coupling to improve the working frequency of the switch. The pseudo virtual line technology introduced can additionally participate in electromagnetic field coupling and change pole distribution and frequency response of a circuit, so that the working frequency of the circuit is improved. In addition, the structure itself has the characteristics of low insertion loss, and a control transistor gate does not need to be additionally applied with a large bias resistor, so that the switching speed of the switch is significantly improved.

An antenna device includes a metal layer for forming an antenna element in a predetermined planar shape and a ground arranged on a lower side of the metal layer. The metal layer forms a first metal forming the planar shape, a notch portion formed at the first metal, and cutting out a part of an edge of the planar shape, a second metal being an electromagnetic field coupling element arranged with a predetermined distance spaced from the first metal inside the notch portion, and a feeder line formed outside the planar shape, and to be connected with the second metal via an opening portion of the notch portion. For the second metal, a width at the opening portion is smaller than a maximum width at a portion more inside the notch portion than the opening portion.

This disclosure provides an antenna device and electronic device capable of miniaturization and achieving the desired radiation efficiency. The antenna device (100) of this disclosure includes: a substrate (20); and a first antenna and a second antenna formed on the substrate (20). A grounding region (20b) includes: a region (20b1) having a length (D2) in the Y direction orthogonal to the X direction; and a region (20b2) having a length (D3) longer than the length (D2). In the case where the substrate (20) is divided in the X direction by an electromagnetic field coupling element (10) into a first side (20c) for the formation of the first antenna element (41) and the second antenna element (42) and a second side (20d) opposite to the first side (20c), the region (20b2) is provided on the second side (20d) of the substrate (20), and a cable (40) connecting the power supply circuit (30) to the first antenna or the second antenna is fixed to the region (20b2).

The invention belongs to the technical field of ionosphere total electron content prediction, and particularly discloses an ionosphere total electron content prediction method based on physical parameter enhancement. The data set comprises ionosphere TEC observation data, space environment data and two-dimensional physical parameter data output by a thermal layer-ionosphere electrodynamic circulation model, and the thermal layer-ionosphere electrodynamic circulation model is based on a first principle; the evolution of a thermal layer and an ionized layer is calculated by adopting thermodynamics, momentum conservation, electromagnetic field coupling and plasma kinetic equations; the data set is preprocessed, so that the TEC observation data and the physical parameter data are matched on the spatial scale; inputting the preprocessed data set into a pre-established ConvLSTM deep learning model for training; and using the trained ConvLSTM model to predict the future ionosphere TEC distribution. According to the invention, the prediction precision of the ionized layer TEC in an extreme space weather state can be effectively improved.

Provided is a laminated electronic component capable of suppressing electromagnetic field coupling between a plurality of inductors and capable of being miniaturized. The laminated electronic component includes a laminate and first to third inductors. An area of a region obtained by vertically projecting a first space including a first axis and surrounded by the first inductor to an XZ plane is larger than an area of a region obtained by vertically projecting a second space including a second axis and surrounded by the second inductor to a YZ plane. The third inductor is disposed such that a third axis does not cross the first space and crosses the second space.

The invention discloses a terahertz ultra-wideband single-pole single-throw high-speed switch, relates to a waveguide transmission line technology, and aims to solve the problems of high insertion loss and the like in the prior art. A coupling line module is arranged for coupling connection between the signal input end and the signal output end; the switch module is used for switching on or switching off the coupling line module; the coupling line module is provided with a folding coupling line structure and a folding pseudo virtual line structure; the folding coupling line structure is used for signal coupling transmission; and the folding pseudo virtual line structure and the folding coupling line structure are symmetrically arranged and are used for assisting electromagnetic coupling so as to improve the working frequency of the switch. The method has the advantages that the introduced pseudo virtual line technology can additionally participate in electromagnetic field coupling, pole distribution and frequency response of the circuit are changed, and therefore the working frequency of the circuit is improved. Besides, the structure has the characteristic of lower insertion loss, and a large bias resistor does not need to be additionally applied to the grid electrode of the control transistor, so that the switching speed of the switch is remarkably improved.

The invention belongs to the technical field of transcranial magnetic stimulation, and particularly provides a coupling control method and system of a multi-coil transcranial magnetic stimulation system.The method comprises the steps that a transient change formula of capacitor voltage and coil current in a coupling state is deduced based on the Kirchhoff's law, a circuit-electromagnetic field coupling model is established, and a current waveform accurate expression is given; capacitance values and accurate voltages in different modes are determined through the expression, and high synchronism of current waveforms is realized by combining capacitor switching and voltage regulation. According to the invention, the multi-coil current synchronism in a coupling state is improved, and effective stimulation and target switching of deep and shallow double targets are realized.

The present invention expands the maximum frequency of radio waves that can be transmitted or received. A laminate (101) comprises a first dielectric sheet, a planar antenna (20) that is provided to the first dielectric sheet, and a substrate (40) for supplying power for the antenna (20). The antenna (20) has a flat first conductor (25) in which a first slot (30) is formed. The first conductor (25) includes a first conductor pattern (21) and a second conductor pattern (22) that sandwich the first slot (30) in plan view. The substrate (40) has a flat second conductor (45) in which a second slot (48) is formed. The second conductor (45) includes a first conductor pad (41) and a second conductor pad (42) that sandwich the second slot (48) in plan view. The first conductor pad (41) overlaps a first region (23), which is a section of the first conductor pattern (21), in plan view in a manner allowing electromagnetic field coupling, and the second conductor pad (42) overlaps a second region (24), which is a section of the second conductor pattern (22), in plan view in a manner allowing electromagnetic field coupling.

The application discloses a non-metallic electric energy metering box with one-code dual-purpose anti-theft electricity verification, which comprises a non-metallic box body, a one-code dual-purpose verification module, a passive external monitoring unit, a physical locking isolation unit and an active reverse verification unit. The box body is made of insulating composite material, and a distributed electromagnetic coupling array is pre-embedded in the wall. The unique identity code of the verification module is used as a legal authentication certificate of the equipment in the first mode, and is used as an anti-theft electricity situation awareness key after being transformed by an algorithm in the second mode. The passive external monitoring unit passively collects running state characteristics through non-contact electromagnetic field coupling in the independent domain outside the box body. The physical locking isolation unit triggers irreversible locking when the characteristics deviate from the threshold. The active reverse verification unit sends a time-varying sequence challenge from the metering end to the power consumption end after locking. The application solves the technical problem of anti-theft electricity of the non-metallic electric energy metering box.

The invention provides a wireless communication automatic gain control method, which comprises the following steps that: by controlling a part of amplifiers in a multi-stage analog amplifier to be closed, a signal enters a post-stage amplifier in an electromagnetic field coupling manner; the dynamic regulator determines and regulates the signal gain by calculating the gain value, regulates the gear and calculates the gain value after the gear is regulated when the regulated signal gain meets the preset gear adjustable range, configures the register value through the lookup table, and regulates the multi-stage analog amplifier through the register; in response to the situation that the adjusted signal gain does not meet the preset gear adjustable range, whether the current gear is the gear limit or not is judged, and according to the state of the partial amplifier, it is determined that the gear is adjusted, and the partial amplifier is controlled to act. By closing part of amplifiers and inputting signals in an electromagnetic field coupling manner, the gain range can be enlarged, so that the range of transmission distance is enlarged, extremely close-range communication is realized, and the performance requirement of the system is met.

This invention provides a millimeter-wave broadband packaged antenna structure, comprising a packaging substrate composed of alternating stacked metal layers and dielectric layers. Multiple metal layers have vertically aligned center-gap regions. A driving patch, a microstrip line matching segment, and a stripline are sequentially connected and aligned along the signal transmission path. A parasitic patch, parallel to and vertically aligned with the driving patch, is located in an adjacent metal layer directly above it. These two patches are not directly electrically connected but are fed through electromagnetic field coupling, allowing the driving patch and parasitic patch to operate at similar but different resonant frequencies, forming a dual-resonance operating mode. This effectively expands the antenna impedance bandwidth. Stripline shielding holes are provided on both sides of the stripline, and antenna shielding holes are arranged around the edge of the gap regions to suppress signal leakage and cavity resonance. This invention replaces the traditional coplanar or slotted method with a vertically stacked coupling structure, achieving antenna miniaturization while significantly improving bandwidth, and enhancing the design freedom of impedance matching through the microstrip line matching segment.

The invention discloses a method and a system for detecting partial discharge of a main transformer of a booster station of a new energy field station, and relates to the technical field of power equipment detection, and the method comprises the steps: building a main transformer working condition electromagnetic field coupling model; acquiring main transformer operation condition data, a characteristic gas concentration signal and a multi-mode detection signal of the booster station main transformer in real time; constructing a multi-modal signal feature vector; determining a main transformer partial discharge first probability; determining a second probability of main transformer partial discharge; and performing deep partial discharge diagnosis under working condition fluctuation sensitive fusion to obtain a main transformer partial discharge diagnosis result. The technical problems that in the prior art, new energy station booster station main transformer partial discharge detection is prone to being interfered by working condition fluctuation, the detection dimension is single, and the accuracy and stability of the diagnosis result are insufficient are solved, accurate detection and multi-dimensional diagnosis of new energy station booster station main transformer partial discharge are achieved, and the accuracy and stability of the diagnosis result are improved. And the accuracy and stability of partial discharge detection are improved.

The invention discloses an electric and magnetic field coupling auxiliary laser hybrid welding device and a rare earth aluminum alloy welding method thereof.The electric and magnetic field coupling auxiliary laser hybrid welding device comprises an electric field power source, a magnetic field power source, a magnetic field coil, a controller of the magnetic field coil, a laser transmitter, a welding gun, a connecting plate, a bolt and a workpiece to be welded; the laser beam penetrates through the center of the magnetic field coil, the magnetic field coil is fixedly connected with the laser transmitter through the connecting plate, the positive electrode of the electric field power supply is connected with a workpiece to be welded, and the negative electrode is connected with the tail end of the laser transmitter; an electric field and a magnetic field are additionally arranged, the electric field accelerates movement of charged particles, then Lorentz force of the charged particles in the plasma under the action of the magnetic field is increased, the charged particles are promoted to move towards a workpiece, the shielding effect is reduced, and the fusion depth is increased; and meanwhile, the electromagnetic force can stir the molten pool to enhance heat transfer and convection of liquid metal in the molten pool, so that a temperature field and solute in the molten pool are homogenized.

This invention provides a high-coupling-efficiency microstrip antenna and a quantum measurement device based on NV color centers. It belongs to the field of NV color center technology. The microstrip antenna includes: a dielectric substrate, a ground plane disposed on a first surface of the dielectric substrate, a radiating patch disposed on a second surface of the dielectric substrate, a feeding structure, and an NV color center diamond. The radiating patch includes an outer radiating patch and an inner radiating patch nested together. The outer radiating patch surrounds an outer region, and the inner radiating patch is located within the outer region, with a gap between them. The inner radiating patch surrounds an inner region. The NV color center diamond is fixed to the second surface of the dielectric substrate and located within the inner region. One end of the feeding structure is connected to the outer radiating patch. This microstrip antenna achieves precise matching with the resonant frequency of the NV color center, improving electromagnetic field coupling efficiency, reducing signal reflection and transmission loss, and enhancing the stability and sensitivity of the quantum measurement system.

The utility model relates to the technical field of phased array radars, in particular to an active phased array radar radio frequency front end, which mainly comprises a mounting box; the cover plate is arranged at the top end of the mounting box; the mounting groove is formed in the top of the cover plate; the connecting plates are arranged on the front and rear surfaces of the mounting box; and the radio frequency front end assembly is arranged at the bottom end of the inner cavity of the mounting box, is used for the radio frequency clamping assembly, is arranged in the inner cavity of the mounting groove and is used for fixing the cover plate. According to the active phased array radar radio frequency front end, the microelectronic technology and the three-dimensional integrated circuit technology are adopted, radio frequency front end assemblies are creatively and horizontally integrated, integration and microminiaturization are achieved, high-temperature superconducting materials are adopted, energy loss is effectively reduced, the overall performance of the assemblies is improved, and in addition, the active phased array radar radio frequency front end is suitable for popularization and application. An electromagnetic field coupling mechanism is adopted, traditional electrical connection is replaced by magnetic coupling and optical coupling technologies, efficient energy and signal transmission between components in the radio frequency front end is achieved, and signal attenuation and energy loss are reduced.

The invention relates to the technical field of power equipment fault detection, in particular to a rotor turn-to-turn fault detection sensor and method based on short-circuit magnetic flux detection. The method comprises the steps that a distributed array is arranged at key positions of a peripheral space of a rotor, and leakage flux distortion signals are captured from multiple dimensions in the axial direction and the circumferential direction; the original induced electromotive force is amplified and suppressed through a low-noise differential pre-amplifier, a filter circuit and a comprehensive signal processing chain, so that signal purification is realized; signals are input into a pre-constructed rotor multi-loop electromagnetic field coupling equivalent circuit model, changes of key parameters such as winding equivalent leakage inductance are reversely deduced in real time through a parameter identification algorithm, spatial distribution differences and spectrum characteristics of probe signals are fused, and diagnosis and accurate positioning of fault winding phases and magnetic pole areas where the fault winding phases are located are achieved. According to the invention, the key technical bottlenecks of the traditional magnetic field detection method in the aspects of early warning sensitivity, accurate fault positioning capability, complex industrial field anti-interference reliability and the like are solved.

The invention relates to the technical field of nanometer photonics and photoelectron metamaterial devices, in particular to a near-infrared band MIM structure perfect absorber and a design method thereof, the near-infrared band MIM structure perfect absorber comprises a bottom metal reflecting layer, a dielectric layer and a composite resonance layer, the composite resonance layer is composed of unit structures arranged periodically, and when incident light irradiates the composite resonance layer, the unit structures are separated from the bottom metal reflecting layer. And the square ring and the circular ring respectively excite local surface plasmon resonance of different wavebands. The square ring is used for enhancing the absorption of the short wave band, the circular ring is used for enhancing the absorption of the long wave band, and the resonance peaks of the short wave band and the long wave band are superposed through the coupling effect of the electromagnetic field, so that the absorption bandwidth of the near-infrared band MIM structure perfect absorber is widened. According to the technical scheme, through interaction of the square ring and the circular ring which are different in shape, the spectral response range and the overall absorption performance of the resonant structure in the absorber are improved, and the technical problem that the absorption bandwidth of a traditional single resonant structure is insufficient is solved.

Disclosed in the embodiments of the present application is a power conversion circuit, comprising a direct current conversion circuit, a pulse width control circuit, and a transformer. The transformer comprises a primary transformer coil and a secondary transformer coil. The direct current conversion circuit is connected to the primary transformer coil, and is used for adjusting an initial voltage inputted to the direct current conversion circuit to a target voltage. The pulse width control circuit is connected to the primary transformer coil, and is used for generating a pulse square wave on the basis of the target voltage. The primary transformer coil is coupled with the secondary transformer coil. The primary transformer coil is used for generating an electromagnetic filed according to the pulse square wave, and coupling the electromagnetic field to the secondary transformer coil so that the secondary transformer coil generates an output voltage.

The invention relates to the technical field of lithium ion battery infiltration methods, in particular to a method for driving lithium ion battery infiltration through electromagnetic field coupling, which comprises the following steps of: (S1) filling a battery consisting of a positive electrode, a negative electrode and a diaphragm into a shell, and injecting electrolyte containing Li ions; and (S2) the battery after liquid injection is placed in an electric field environment and a magnetic field environment to be stored for a preset time, the included angle A between the electric field direction and the magnetic field direction is larger than 0 degree and smaller than 180 degrees. According to the method for driving the lithium ion battery to infiltrate through electromagnetic field coupling disclosed by the invention, the infiltration efficiency of the electrolyte can be remarkably improved.

The application relates to the technical field of power cables, and discloses a parallel power cable current sharing optimization method and device based on a magnetic ring current shunt, wherein the method comprises the following steps: simulating a three-dimensional finite element model and determining a first simulation impedance; obtaining an equivalent circuit model, determining a theoretical impedance according to the equivalent circuit model, and determining a current impedance according to the theoretical impedance and the first simulation impedance; obtaining an electromagnetic field coupling model and determining magnetic ring compensation parameters, simulating the electromagnetic field coupling model according to the magnetic ring compensation parameters and the current impedance to determine an impedance compensation mapping relationship; determining an impedance compensation sensitivity matrix according to the impedance compensation mapping relationship, and setting the value of the magnetic ring compensation parameters to perform current sharing optimization on the parallel power cable. The application can quantize the mapping relationship between the magnetic ring compensation parameters of the magnetic ring current shunt and impedance compensation, thereby accurately generating an optimal compensation scheme, greatly improving the reliability of the parallel power cable, and being beneficial to realizing power transmission safety.

A double resonance transformer uses a primary winding, a first secondary winding, and a second secondary winding to perform voltage conversion using an electromagnetic induction phenomenon based on a winding ratio of the primary winding, the first secondary winding, and the second secondary winding in a rectification operation period that is a conduction period of a first rectification element or a second rectification element. The double resonance transformer uses a primary-side resonance circuit and a first secondary-side resonance circuit or a second secondary-side resonance circuit to perform power transfer using an electromagnetic field resonance phenomenon based on the formation of electromagnetic field coupling between the primary-side resonance circuit and the first secondary-side resonance circuit or the second secondary-side resonance circuit in a rectification stop period in which both the first rectification element and the second rectification element are non-conductive. Due to the electromagnetic field resonance phenomenon, the double resonance transformer 30 holds, as resonance energy, electromagnetic field energy not involved in the power transfer in the primary-side resonance circuit and the first secondary-side resonance circuit or the second secondary-side resonance circuit. The first secondary-side resonance circuit and the second secondary-side resonance circuit start resonance operations at the start of the rectification stop period, end the resonance operation at the end of the rectification stop period, alternately switch the resonance operations of the first secondary-side resonance circuit and the second secondary-side resonance circuit over time, and supply the resonance energy to a load connected to a secondary-side smoothing circuit.

This invention discloses a high-speed motor speed detection method based on MEMS microcoils, relating to the field of high-speed motor speed detection. The method includes: non-contactly placing at least one MEMS microcoil sensor at a key electromagnetic field coupling position on the high-speed motor body or drive circuit; the MEMS microcoil sensor outputting a raw induced voltage signal; conditioning the raw induced voltage signal; using an analog-to-digital converter to perform high-speed synchronous sampling of the conditioned signal to obtain a digital signal sequence; extracting the speed characteristic frequency; calculating the real-time motor speed based on the speed characteristic frequency and preset motor parameters through a preset mapping relationship, and outputting the calculation result. This invention employs a miniaturized coil sensor based on MEMS technology, combined with intelligent signal processing algorithms, to achieve high-precision, high-response speed measurement in ultra-high-speed scenarios.