368 results about "Half wave" patented technology

Provided is an impedance measurement device 100 for measuring the impedance of a battery cell. The device acquires a cell voltage signal between the positive and negative electrodes of a battery cell 20 while a measurement current wave is made to flow through the battery cell 20, modulates the cell voltage signal with a polarity inversion wave synchronized with the half wave of the measurement current wave, adds the modulated wave at the non-inverted and inverted half-cycles of the modulated wave, and adds the modulated wave a prescribed number of times at a cycle synchronized with the polarity inversion wave, thereby generating an AC voltage detection signal, and measures the impedance of the battery cell 20 from the amplitude ratio and the phase difference between the AC voltage detection signal and the measurement current wave.

The present invention discloses a method and a system for enhancing an ultrasonic guided wave signal based on multi-modal recognition and fusion. The method includes: solving an ultrasonic guided wave frequency dispersion curve of a detected structure, selecting target detection modes, and setting the strongest energy mode as the main mode; forming a frequency dispersion dictionary and obtaining sub-signals, then converting their abscissa axes from time to signal source distances; grouping sub-signals with similar source distances, classifying them as single modal or main mode conversion sub-signals, and removing interference signals; and resampling the classified sub-signals at a uniform frequency, extracting half-wave envelope signals, and superposing them within each source group to obtain an enhanced target signal

The invention discloses a continuous scanning half-wave sampling system for a multi-dimensional coherent spectrum, which comprises a continuous laser, continuous laser output by the continuous laser and femtosecond laser pulse output by an ultra-short femtosecond laser pulse generation device are combined and then split, and modulation and time delay are respectively carried out; the multi-dimensional coherent femtosecond laser pulse sequence is used for exciting a fluorescence signal generated by a sample and converting the fluorescence signal into a first electric signal, and the obtained continuous laser carrying different modulation frequencies is converted into a second electric signal; and demodulating the second electric signal by taking a total mixing signal obtained by mixing the multiple paths of modulation signals as a reference, and demodulating the first electric signal by using the second electric signal. The invention further discloses a continuous scanning half-wave sampling method for the multi-dimensional coherent spectrum. The half-wave sampling method is utilized to accurately calibrate optical time delay so as to obtain the multi-phase multi-dimensional coherent spectrum. The sampling step length breaks through the limitation of the minimum sampling step length of traditional stepping collection, and the sampling bandwidth is remarkably improved.

The invention discloses a high-voltage direct-hanging energy storage system and a control method, and relates to the technical field of power systems. The high-voltage direct-hanging energy storage system comprises at least one single-phase energy storage circuit, in the single-phase energy storage circuit, a direct-current energy storage module is formed by connecting N energy storage sub-modules in series, each energy storage sub-module comprises a half-bridge unit and an energy storage element, and the energy storage sub-modules are used for achieving switching of working states of input, switching-out or locking through the half-bridge units; the current conversion module comprises a first bridge arm branch and a second bridge arm branch; the first bridge arm branch and the second bridge arm branch are used for being connected to the two ends of a direct-current energy storage module in parallel, and the midpoint of the first bridge arm branch and the midpoint of the second bridge arm branch are used for being electrically connected with an alternating-current interface of one phase of an alternating-current power grid. The direct current energy storage module is used for generating a multi-level voltage equivalent to a half sine wave, and the current conversion module is used for performing forward output or reverse output on the multi-level voltage. According to the embodiment of the invention, the overall performance of the energy storage system can be effectively improved.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

A sine half-wave generating device comprises a power supply circuit and a test circuit connected with the power supply circuit, a main loop of the test circuit is provided with a connection interface for connection of a test sample, and the test circuit comprises a current peak selection module, a control module, an output module and a waveform direction switching module. The current peak value selection module is used for changing the current peak value on the main loop, and the waveform direction switching module is used for changing the waveform generation direction on the main loop. The beneficial effects of the utility model are that the test circuit is divided into functional modules of current peak value selection, control, output, waveform direction switching and the like, a modularized residual current test system architecture is formed, and sine half-wave pulses which can be flexibly adjusted can be provided according to the performance test requirements of the residual current operated circuit breaker.

The invention discloses a dynamic tunable zero-level electro-optical wave plate system, a device and a preparation method, and belongs to the technical field of optical devices. The invention provides a dynamic tunable zero-order electro-optical wave plate system, and the system comprises a zero-order electro-optical wave plate device which comprises a wave plate substrate made of an electro-optical crystal of a non-centrosymmetric structure, and an electrode disposed on the wave plate substrate; the output end of the adjustable voltage source is electrically connected with the electrode; wherein the adjustable voltage source is configured to be capable of outputting a half-wave working voltage corresponding to a target working wavelength, so that the zero-order electro-optical wave plate device works at the target working wavelength as a half-wave plate. According to the invention, self-adaptive matching of a single device to a plurality of working wavelengths is realized, the problem that the working wavelength of the device is single due to material dispersion is solved, and meanwhile, the processing difficulty of an ultrathin structure required by a specific wave band is avoided.

The utility model discloses a balun-integrated full-wave oscillator radiation unit, and aims to solve the problems that a low-frequency bowl-shaped oscillator and a high-frequency die-cast half-wave oscillator are used in the conventional high-low frequency nesting scheme, so that the requirements of miniaturization and light weight of an antenna are difficult to meet, the processing cost is extremely high, and the cost is low. And meanwhile, the high-frequency oscillator is arranged in the bowl-shaped oscillator, so that the horizontal plane wave width deformation of the high-frequency oscillator is caused, the gain is influenced, and the market demand cannot be met. The Balun-integrated full-wave oscillator radiation unit comprises a fixed support and a PCB radiation plate installed on the fixed support. The structure of the full-wave oscillator is relatively simple, assembly can be completed only by installing the single-balun integrated feed sheet in the fixing support and welding and fixing the single-balun integrated feed sheet and the PCB radiation plate, miniaturization design can be achieved through the microstrip technology, the printed circuit technology and the like due to the fact that single-face embedded coupling is adopted, the requirement of miniaturization equipment is met, machining is easy, and cost is low. The production efficiency can be greatly improved, and the production cost is reduced.

The invention relates to the technical field of electric power safety monitoring, in particular to a fault arc detection method, device and equipment and a storage medium, and the method comprises the steps: obtaining a current periodic waveform of an electric power system in a low-voltage alternating current scene, and collecting a first half-wave waveform of the current periodic waveform according to a time sequence, determining the next half-wave waveform which is continuous with the first half-wave waveform as a second half-wave waveform; acquiring a first current characteristic parameter of the power system in the first half-wave waveform, and acquiring a second current characteristic parameter of the power system in the second half-wave waveform; and determining an adjacent half-wave similar threshold according to the first current characteristic parameter and the second current characteristic parameter, and identifying the fault arc according to the adjacent half-wave similar threshold. The invention aims to improve the accuracy of identifying the fault arc.

Disclosed in the present invention are a method for precise transmission and parsing of a phase-cut transmission control signal, a control system, an apparatus and a gateway device. On the basis of a live wire alternating current sinusoidal signal, generation of a zero-crossing pulse signal is triggered every T / 2 cycle; a synchronization signal immediately follows the generation triggering of a current zero-crossing pulse; during a valid identification cycle Ta, a falling edge of an alternating current half wave is caused to generate a right notch corresponding to a time tR, or an original state is maintained until a next zero-crossing pulse is generated; the generation of a zero-crossing pulse represents a first digital signal, and the generation of a right notch represents a second digital signal, signals outside the cycle Ta being invalid. A midpoint between a rising edge and a falling edge of each zero-crossing pulse is used as a theoretical zero-crossing point to trigger timing, and the position of the theoretical zero-crossing point is corrected in real time for each zero-crossing pulse signal, thereby eliminating communication errors caused by alternating current interference; a synchronization signal and a valid identification cycle are used to mark the start and the end, thereby achieving precise parsing; and when there is no data transmission, only zero-crossing pulses are generated, thereby reducing energy consumption.

The present invention relates to the fields of ferroelectric single crystal technology and acousto-optical device technology, particularly to a silicon-based lead magnesium niobate (PbMn) single crystal piezoelectric wafer structure, preparation method, and application. The structure comprises a silicon substrate on which a silicon dioxide layer and a single crystal piezoelectric thin film layer are sequentially disposed; the single crystal piezoelectric thin film layer is a PbMn-PT single crystal, including a binary PMN-PT single crystal thin film or a ternary PIN-PMN-PT single crystal thin film. This piezoelectric wafer structure on a silicon substrate can be used to fabricate various high-performance piezoelectric MEMS sensors, actuators, and electro-optical modulator devices. The resulting surface acoustic wave (SAW) filters and thin film bulk acoustic wave (BAW) filters exhibit a relative bandwidth increase of over 50%, and the resulting electro-optical modulators exhibit lower half-wave voltage and higher electro-optical modulation efficiency. The device volume can be reduced by 10 times, better meeting the future 6G communication requirements for higher efficiency, higher integration, and miniaturization of MEMS devices. This provides a novel multilayer piezoelectric wafer structure for the miniaturization and integration of piezoelectric MEMS and optoelectronic devices.

The utility model provides an anti-unmanned aerial vehicle antenna structure, which comprises an antenna housing, a reflecting plate, a plurality of radio frequency cable joints arranged in the antenna housing, a feed network, an antenna half-wave oscillator, a power divider, a coupler, a directional coupler, a directional antenna system, a control system and a power supply unit, wherein a plurality of radio frequency cable probes are connected with the antenna half-wave oscillator; comprising a 868MHz / 915MHz radio frequency cable joint, a 1.5 GHz radio frequency cable joint, a + 2.4 GHz radio frequency cable joint, a-2.4 Ghz radio frequency cable joint, a 5.8 GHz radio frequency cable joint and a 533MHz-6000 MHz radio frequency cable joint. The antenna half-wave oscillator comprises a T-shaped antenna, a symmetrical antenna, a ceramic antenna and an aluminum plate antenna; the power divider is connected with the symmetrical antenna; the coupler is connected with the T-shaped antenna; the directional coupler is connected with the ceramic antenna; the directional antenna system is connected with the control system. The antenna provided by the utility model is smaller in structure, improves the interference precision, reduces the energy consumption, enhances the anti-interference capability, and is higher in antenna gain.

The invention discloses a liquid crystal variable retarder calibration method based on an interference method. The method is used for accurate calibration of LCVR electric control retardation. According to the method, an interference image is collected through a CCD camera, and after the image is preprocessed, FFT transformation unwrapping is carried out on an image column average intensity vector to obtain an LCVR electric control phase retardation curve. A polarization camera collects a light intensity image containing multi-polarization information at a time, polarization sub-images corresponding to 0 degree, 90 degrees, 45 degrees and 135 degrees are decomposed through sub-pixel sampling, a polarization judgment curve is formed through difference calculation of Stokes parameters S0 and S2, and the LCVR half-wave delay voltage is determined through the position of the minimum value of the curve. According to the method, the vibration resistance of the interference method and the noise reduction characteristic of the Stokes vector method are combined, the LCVR electric control delay curve can be calculated through the interference method, meanwhile, the half-wave delay voltage is synchronously indicated through Stokes vector calculation, the problems of unstable laser light source intensity, environmental disturbance, noise influence and the like are effectively solved, and the method has important significance on accurate calibration of the LCVR.

The invention discloses an omni-directional optical half-wave oscillator design method and system, and the method comprises the steps: arranging a plurality of light-emitting units in a rotationally symmetrical geometric layout based on the symmetry and continuity requirements of light spots, and determining the minimum number of units through restraining the maximum azimuth angle interval between adjacent units not to exceed a preset threshold value, thereby enabling the superposed light spots to approach a circle; a light spot uniformity quantitative evaluation mechanism is introduced, a dynamic evaluation index is generated by calculating the ratio of the light spot area to the perimeter, and the unit number and the arrangement mode are optimized in real time; light spot distribution curves under different arrangements are simulated in combination with the divergence characteristics of the light emitting units, parameters are adjusted through iteration until evaluation indexes reach a preset range, and the optimal radiation array configuration is determined. The problem of strict alignment in traditional optical communication is solved, multi-terminal parallel receiving is supported, and the system has remarkable advantages in the aspects of providing uniform illumination, improving mobile communication stability, ensuring electromagnetic compatibility, achieving energy feeding and the like.

The invention discloses a photovoltaic power generation system, and belongs to the technical field of power generation. The system comprises an inverter circuit, an alternating-current starting circuit and a control unit, the alternating-current starting circuit comprises an alternating-current starting switch, an isolation module and a charging module which are sequentially connected from a power grid side, and the control unit is connected with the inverter circuit and the alternating-current starting switch. The control unit is used for controlling the alternating-current starting switch to be closed and transmitting electric energy of a power grid through the isolation module when the direct-current voltage of the input end of the inverter circuit is lower than the sum of the power grid line voltage peak-to-peak value and a threshold value and an alternating-current starting instruction is received, and the charging module carries out current limiting and rectifying processing on alternating-current electric energy output by the isolation module. The direct-current bus capacitor is charged by alternating positive and negative half waves of alternating current; and the control unit is also used for controlling the alternating current starting switch to be switched off and starting the inverter circuit under the condition that the direct current bus capacitor is charged to the target voltage required by grid connection. The system can be safely and reliably started when no sunlight exists at night.

The invention discloses a frequency response testing device and method for a Mach-Zehnder electro-optical modulator, and belongs to the technical field of photoelectrons. A dual-tone or multi-tone optical signal output by the optical excitation module is transmitted to the Mach-Zehnder electro-optical modulator to be measured; the signal source outputs a sinusoidal signal of which the frequency is f, and the sinusoidal signal is loaded to a radio frequency driving electrode of the Mach-Zehnder electro-optical modulator to be measured to modulate an optical signal sent into the Mach-Zehnder electro-optical modulator to be measured by the optical excitation module; and finally, a modulated light signal output by the Mach-Zehnder electro-optical modulator to be measured is subjected to photoelectric conversion and detection through the measurement module. And extracting a modulation coefficient and a half-wave voltage of the Mach-Zehnder electro-optical modulator to be measured at the frequency f according to the amplitude of the detection signal and the signal amplitude loaded to the Mach-Zehnder electro-optical modulator to be measured by the signal source.

The present invention discloses a dimming system based on a power line carrier and a dimming and color adjusting control method. The dimming system includes a phase-cut carrier controller, a main power supply, a dimming detection circuit, a color temperature adjusting detection circuit, a signal processing circuit, a first driving circuit, a second driving circuit, an MOS transistor Q1 and an MOS transistor Q2. Through the above structure, a waveform of waves in each cycle, input to a phase-cut dimming and color adjusting driver by a power frequency AC, is reserved, and there is no situation where the entire half wave is chopped. Therefore, each half wave input by the power frequency AC charges energy storage capacitors inside circuits, making the energy storage capacitor of the main power supply smaller and keeping required maintenance time for output of a lamp.

The invention relates to an electro-optical crystal half-wave voltage temperature correlation detection method and system. The system comprises a light source, a polarizer, an optical phase modulator, an isolation optical fiber, an electro-optical crystal to be detected and a polarization analyzer which are sequentially arranged along a light path. The included angle between the light transmitting direction of the polarizer and the fast axis direction of the optical phase modulator is 45 degrees; the included angle between the light transmitting direction of the polarization analyzer and the fast axis direction of the electro-optical crystal to be detected is 45 degrees; applying voltage to the optical phase modulator, wherein the voltage amplitude is 1 / 4 wavelength voltage of the optical phase modulator; constructing a light path inherent function; the environment temperature of the electro-optical crystal to be detected is changed, the intensity of output light at different temperatures is detected, the nearly 1 waveform variation is calculated according to the light intensity, and the correlation between the electro-optical coefficient of the electro-optical crystal to be detected and the temperature is judged according to the nearly 1 waveform variation.

The invention discloses an ultrasonic defect detection method based on AI identification, and aims to solve the problems that in the prior art, a half-wave height method cannot automatically distinguish true and false defects, and an AI algorithm is large in calculation amount, unstable in result and the like in defect quantitative evaluation. The method comprises the steps of firstly obtaining and preprocessing an ultrasonic detection image; thirdly, carrying out preliminary coordinate positioning and size evaluation on the suspected defects by adopting a national standard half-wave height method; then, carrying out authenticity judgment on the defect by utilizing an AI identification algorithm; and finally, integrating an AI judgment result and a half-wave height method evaluation result, and determining the real position and size of the defect. Compared with the prior art, the method has the advantages that the advantages of the two methods are effectively combined, automation, high efficiency and high accuracy of defect detection are realized, manual intervention and misjudgment are remarkably reduced, superiority is particularly shown in complex scenes such as thin plate detection, hardware does not need to be transformed, and good practicability and compatibility are achieved.

The invention belongs to the technical field of ground fault test pull line selection and section selection, and particularly relates to a ground fault test pull line selection and section selection method. The method comprises the following steps: performing grounding fault starting judgment according to a grounding signal or a bus phase voltage; after grounding fault judgment is started, fault type judgment is carried out, and the fault types comprise a permanent fault and a transient fault; if the fault is judged to be a permanent fault, a comprehensive line selection and section selection strategy is adopted, and an optimal fault line selection and section selection result is output; based on a fault line selection and section selection result, further positioning a grounding fault interval through a test pull strategy; and after the grounding fault interval is determined, rear-end load transfer is started, and load side power supply is recovered. According to the method, through a multi-criterion fusion starting and comprehensive line selection strategy, weighted comprehensive scoring of a group amplitude comparison and phase comparison method, a first half wave polarity method and a transient energy method is combined, and the limitation of a single method is effectively overcome.

The invention discloses an automatic half-wave voltage detection device and method for a crystal modulation experiment, and particularly relates to the technical field of photoelectric measurement. Comprising a tunable laser source (the wavelength of 560-750 nm is adjustable), a crystal modulation module (a high-voltage direct-current power supply and a signal source), an integrated detection module (a horizontal rotating support integrated power meter and a photoelectric converter) and a control module (double data acquisition cards and a Python program). The function implementation mode is as follows: the synchronous measurement of an extreme value method (extracting extreme points by moving average fitting of a U-P curve) and a frequency multiplication method (capturing frequency multiplication distortion points by spectral analysis) is automatically executed through a rotary bracket switching detection unit (the alignment precision is less than or equal to 0.1 mm); and a lambda-Upi relation curve is generated in combination with multi-wavelength scanning, and is compared with a theoretical formula Upi = lambda d / (2n03gamma22L) for analysis. According to the invention, manual intervention and optical path dismounting errors are eliminated, full-process closed-loop control is realized, and high-precision data support is provided for parameter optimization of the electro-optical modulator.

The application discloses a cochlear implant multi-channel stimulation pulse half-wave detection system and method, and relates to the technical field of cochlear implants, in particular to a cochlear implant multi-channel stimulation pulse half-wave detection system and method. The system comprises a test board, a head piece and a speech processor, and further comprises a half-wave detection unit and a multi-channel collector. The test board comprises a receiving coil, a stimulator, a stimulation electrode and a test electrode terminal. The speech processor receives and processes sound signals and encodes the sound signals. The encoded signals are transmitted to the receiving coil through the head piece. After decoding processing by the stimulator, pulse signals with corresponding frequencies and current intensities are generated and transmitted to each stimulation electrode. The stimulation electrode is connected to the test electrode terminal. The test electrode terminal is connected to the multi-channel collector. The multi-channel collector is connected to the half-wave detection unit. The multi-channel collector combines n stimulation electrodes to transmit signals to the half-wave detection unit for half-wave detection. The application utilizes the multi-channel collector and the half-wave detection unit to realize automatic half-wave detection, reduce labor costs, and improve the efficiency and success rate of half-wave detection.

The invention relates to a control method of an AC / DC converter, and the method comprises the steps: controlling a balance bridge circuit to continuously work in each AC period for energy transmission under the condition that the AC side current is detected to be half-wave current, for example, a half-wave load is provided; the situation that the energy transmission process of the balance bridge circuit is concentrated in a half alternating current period, consequently, midpoint balance current overcurrent is caused, wave-by-wave current limiting is triggered, and then the maximum half-wave load carrying capacity of a system is affected is avoided. Therefore, according to the control method of the AC / DC converter provided by the embodiment of the invention, the half-wave load carrying capacity of the AC / DC converter is improved.

The application relates to a bidirectional output L2C3 resonant converter, which comprises two excitation sources and a resonant cavity, wherein the excitation sources are both half-wave bridge circuits; the resonant cavity comprises a transformer, three capacitors and two inductors; the primary winding of the transformer is connected in parallel with a resonant capacitor C p 1; the same end of the primary winding of the transformer is connected with a resonant capacitor C1 and an inductor L1 in series connection; the other end of the inductor L1 is connected with the connection point of the first excitation source and two switch tubes in series connection; the same end of the secondary winding of the transformer is connected with a resonant capacitor C2; the other end of the resonant capacitor C2 is connected with the connection point of the second excitation source and two switch tubes in series connection; the leakage inductor L g of the secondary winding of the transformer is used as a resonant inductor; the other ends of the same ends of the primary and secondary windings of the transformer are respectively connected with the negative poles of the direct-current power supplies of the corresponding excitation sources. Energy bidirectional transmission and synchronous rectification are realized through a brand-new circuit topology. All active switches can realize soft switching, and the working efficiency is improved. In an open-loop control state, the output current does not change with the change of a load, and the application is suitable for a bidirectional constant current working mode.

The invention provides a lithium niobate modulator chip with a multi-layer electrode structure and a preparation method thereof, and relates to the technical field of quantum communication and optical fiber communication, the lithium niobate modulator chip with the multi-layer electrode structure comprises a substrate wafer, a plurality of optical waveguides and a plurality of electrodes; the substrate wafer comprises a three-layer structure of silicon, silicon oxide and a lithium niobate film; the optical waveguides are parallel to one another, the middle electrode of each optical waveguide is a live wire, and the electrodes on two sides are ground wires; the electrode is formed by alternately distributing a plurality of electrode layers and a plurality of dielectric layers; the input end and the output end of the traveling wave electrode each comprise a live wire bonding pad and a ground wire bonding pad, the live wire bonding pads and the ground wire bonding pads are of a stacked structure, and each layer of bonding pad is connected to a radio frequency lead pin and a terminal load through an independent gold wire. According to the invention, the multi-layer electrode structure is adopted, so that the usage amount of gold is saved, the production cost of the modulator is reduced, and the mass production capability of a modulator chip is improved; and by reducing the half-wave voltage length product, the power consumption of the device is reduced.

The invention discloses an arc-free on-off method and device of a vacuum mechanical switch, electronic equipment and a storage medium, the method is suitable for a vacuum mechanical circuit breaker, the vacuum mechanical circuit breaker comprises two branches which are connected in parallel, and each branch comprises a diode and a vacuum mechanical switch; the diodes in the two branches are reversely connected in parallel; the arc-free breaking method comprises the following steps: when the vacuum mechanical circuit breaker has a short-circuit fault, determining current half-waves which can pass through a first diode and a second diode, and according to positive and negative half-waves of short-circuit current and the current half-waves which can pass through the first diode and the second diode, carrying out arc-free breaking on the vacuum mechanical circuit breaker; obtaining a first time period in which the passing current in the first diode is zero and a second time period in which the passing current in the second diode is zero; and the first vacuum mechanical switch is controlled to be switched off in the first time period, and the second vacuum mechanical switch is controlled to be switched off in the second time period. According to the invention, arc-free on-off of the vacuum mechanical switch can be realized.

The utility model discloses a low-ripple rectification voltage doubling circuit, which relates to the field of voltage doubling rectification and comprises a first-stage voltage doubling module, a second-stage voltage doubling module, a third-stage voltage doubling module and a fourth-stage voltage doubling module, the second-stage voltage multiplying module is used for carrying out voltage multiplying on the input negative half-cycle voltage; the transformer is used for connecting outputs of the first-stage voltage-multiplying module and the second-stage voltage-multiplying module in parallel and converting an output result into high-voltage electricity; the bridge rectifier module is used for rectifying the high-voltage electricity and outputting direct-current voltage; one end of the primary voltage-multiplying module is respectively connected with one end of the secondary voltage-multiplying module, one end of the transformer and one end of the bridge rectifier module, and the other end of the secondary voltage-multiplying module is connected with the other end of the bridge rectifier module and the other end of the transformer. The two groups of half-wave voltage doubling circuits provided by the utility model are applied on the circuit in a staggered manner, the circuit structure is simple, the cost is low, the economic benefit is high, two groups of pulse voltages with complementary phases are output, and the output voltage ripples are greatly reduced.

Method for detecting the position (S) of an accelerator pedal (2) of a motor vehicle (3), in which an accelerator pedal raw signal (7), which describes the position (S) of the accelerator pedal (2) as a function of time (t), is detected and the accelerator pedal raw signal (7) is smoothed, characterized in that half-waves (8) of the accelerator pedal raw signal (7) are determined, on the basis of the determined half-waves (8) a state of instability during an actuation of the accelerator pedal (2) is detected and the accelerator pedal raw signal (7) is smoothed if the state of instability is detected.

This application relates to a radiating element and an antenna. The radiating element includes two sets of orthogonally polarized half-wave dipoles and two feed components. Each set of half-wave dipoles includes two radiators arranged at relative intervals. The two feed components are arranged one-to-one with the two sets of half-wave dipoles. Each feed component includes a metal support and a feed element. One end of the metal support is electrically connected to one of the radiators of the corresponding half-wave dipole, and the other end of the metal support is used for grounding. The feed element is electrically connected to the other radiator of the corresponding half-wave dipole. The radiating element provided by this application is small in size and lightweight.

The application discloses an asymmetric phase-shifting control method suitable for a half-wave shaping MMC, and can realize wide-range operation energy balance of a converter. The method is characterized in that, in a 2pi period, a commutation unit switching function and a multi-level unit modulation voltage are not switched in a half-wave period pi, but in a positive half-wave mode, [0, pi] is taken as a reference to expand and shift an angle theta to the left and right, that is, the interval is [-theta, pi+theta], and in a negative half-wave mode, [pi, 2pi] is taken as a reference to shrink and shift an angle theta to the left and right, that is, the interval is [pi+theta, 2pi-theta]. The application adopts an asymmetric phase-shifting modulation method, generates and reverses polarities of two asymmetric partial sine waves through a commutation switch cooperating with a multi-level unit, and obtains a complete multi-level sine wave on an alternating current side. The application can eliminate the limitation of a power factor angle on a phase-shifting angle while realizing wide-range energy balance of the converter, is only affected by a modulation ratio, and compared with symmetric phase-shifting modulation, is beneficial to simplifying commutation control logic when the system is in a wide-range reactive power regulation, and has better engineering application value.