274 results about "Half wave" patented technology

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.

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.

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 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 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 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 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.

The application relates to the technical field of antennas and discloses a dipole antenna and a UAV. The dipole antenna comprises a body part and a winding structure. The winding structure is arranged on the body part, and a gap exists between the winding structure and the body part. The winding structure is formed by winding a winding sheet. The winding structure comprises a plurality of winding turns arranged coaxially. The length of the body part is greater than the length of the winding structure. According to the application, an asymmetric half-wave dipole antenna is formed by the body part and the winding structure, two resonance modes are excited in the VHF frequency band, a wider standing wave matching is obtained through double-mode resonance, the gain of the dipole antenna in the VHF frequency band is improved, and the detection range of the UAV is increased.

The invention discloses an overall performance analysis method for a casing reinforcement space grid structure based on a simplified model, and aims to solve the problems that the casing reinforcement research is limited to a component level, the overall structure modeling efficiency is low, and the node rigidity and the initial bending defect are difficult to accurately consider. The method comprises the following steps: firstly, establishing a refined and simplified model of a casing reinforcing member, verifying the accuracy of the simplified model through a test, simulating an inner pipe and an outer pipe by using a BEAM188 beam unit, and realizing collaborative stress simulation through degree-of-freedom coupling; introducing a semi-rigid defect unit, generating a component model containing a half-wave sine initial bending defect in combination with a BSPLIN command, and rotating a local coordinate system at a random angle to simulate the randomness of an initial bending direction; and parameterized simulation analysis of structural node rigidity, initial bending defects and casing reinforcement is realized based on the model. The method can efficiently and accurately simulate the mechanical property of the casing pipe reinforced overall structure, provides a reliable numerical means for evaluating the reinforcing effect of the space grid structure, and is high in calculation efficiency and wide in application range.

The invention discloses a mutual inductor electrical performance verification method, which adopts a digital bridge with a direct current bias function, uses the digital bridge to detect an actually measured bias current inductance value of an iron core, calculates a theoretical bias current inductance value of a mutual inductor finished product, and also uses the digital bridge to detect the actually measured bias current inductance value of the mutual inductor finished product. According to the method, the actually measured bias current inductance value of the finished mutual inductor is compared with the theoretical bias current inductance value of the finished mutual inductor, so that whether the iron core is degraded after being assembled into the finished mutual inductor in the processes of winding, assembling, potting and aging is judged, and then whether the consistency of the direct current resistance and the half-wave error of the finished mutual inductor is qualified is judged. The equipment used in the invention has the advantages of lower cost, high detection efficiency and short test time, and is favorable for improving the production efficiency.

The invention discloses a medium-voltage distribution network fault line selection method based on a low-voltage side transient state line mode current first half wave direction, belongs to the technical field of distribution network analysis, and identifies a medium-voltage distribution network small current system single-phase earth fault line through multi-point collaborative contrastive analysis of the low-voltage side transient state line mode current first half wave direction after a fault. The method can solve the problem of fault line selection of a small-current system only through low-voltage measurement under the condition that a medium-voltage side fault detection device is not needed, or can be used as an auxiliary means of the medium-voltage side fault detection device to improve the fault treatment capability of a medium-voltage distribution network, and further improves the operation safety of the system and the public safety of personnel. The method is low in required material and labor cost, high in accuracy and good in operability.

The utility model discloses a system for measuring the half-wave voltage of a phase modulator. The system comprises a laser generation module, an optical coupler, a first phase modulator, a second phase modulator, a first Faraday mirror, a second Faraday mirror, a signal generator, a photoelectric detector and an oscilloscope. The utility model discloses a system for measuring the half-wave voltage of a phase modulator, which is characterized in that a high-frequency periodic square wave electric signal is loaded to a second phase modulator through a signal generator, and the phase drift amount caused by unstable factors such as a light source, an optical device and an external environment can be regarded as perturbation in a small time period; the half-wave voltage of the second phase modulator is obtained by accurately calculating the variable quantity of the number of the peak (valley) values of the sine (cosine) waveform, so that the judgment on the light intensity extreme point of an interference pattern is avoided, the measurement precision is improved, and the key core application in the fields of quantum communication and quantum calculation is realized.

An optical stack includes a reflective polarizer, an absorbing polarizer, and a half-wave retarder. The half-wave retarder is disposed between the reflective and absorbing polarizers. For substantially normally incident light and a first polarization state, the reflective polarizer reflects at least about 60% of the incident light for at least a first wavelength less than a cut-off wavelength and transmits at least about 50% of the incident light for at least a second wavelength greater than the cut-off wavelength. For substantially normally incident light, the half-wave retarder has a first retardance of less than about 250 nanometers (nm) at the first wavelength and a second retardance at the second wavelength. A deviation of the first retardance from a first half-wave retardance corresponding to the first wavelength is less than a deviation of the second retardance from a second half-wave retardance corresponding to the second wavelength.

The present application relates to the technical field of ultrasonic detection, and particularly relates to a copper plate defect detection and inspection method, system, device and medium; the method comprises the following steps: acquiring an original data set; acquiring a point spread function; solving by iterative deconvolution according to the point spread function to acquire a real defect image; extracting the edge of the real defect image to acquire an edge anchor point set; acquiring a spline interpolation function and the like; the interference of the focal spot energy distribution on the defect boundary positioning is eliminated by iterative deconvolution, and the combination of the edge anchor point set and the spline interpolation function ensures the geometric fidelity of the reconstruction model at the edge, while reducing the amount of calculation; the problem that when the focal spot energy loss of the half-wave height method is half of the initial energy, the focal spot center and the edge of the special-shaped defect do not match, resulting in that the measured value is not equal to the actual defect size, is solved; at the same time, the interference of the focal spot energy distribution on the defect boundary positioning is eliminated, and the defect size measurement precision is improved.

The invention belongs to the related technical field of microwave antennas, and discloses a dual-polarized broadband oscillator antenna, which comprises an antenna cavity, a feed support structure, a radiator and a metal floor, and is characterized in that the antenna cavity is of a rectangular metal cavity structure and is used for accommodating the feed support structure and the radiator; symmetrical rectangular protrusions protruding inwards are machined in the center line positions of the four side walls of the box body. The feed support structure comprises two groups of hollow and solid metal tubes which form a mutually orthogonal arrangement form, and each hollow metal tube is internally provided with a radio frequency cable; the radiator comprises two pairs of half-wave oscillators and four parasitic branches, each pair of half-wave oscillators is provided with oscillator arms vertically installed at the top end of the feed supporting structure, and the parasitic branches are arranged on diagonal lines of the adjacent oscillator arms respectively. Compared with an existing product, the antenna has the advantages of being wide in frequency band, high in isolation degree, dual-polarized, stable in radiation performance and the like, and meanwhile the environmental adaptability of the antenna is improved.

To realize good commutation while simplifying the circuitry and control.SOLUTION: This circuit is provided with switches V1, V3 and V4 for respectively selecting a voltage source 11 for outputting a voltage S1, a voltage source 13 for outputting a voltage S3 and a voltage source 14 for outputting a voltage S4 to an outputting terminal 10, and a current source 12 connected between the outputting terminal 10 and a ground terminal 9 through the switches S3. A control part 20 turns on the switch V1 after the voltage is lowered to the vicinity of the voltage S1 by the second half-wave resonance to maintain the voltage Vop1 at a low level, and turns on the switch S3 to make the current of the first half-wave resonance flow in a resonance loop including a capacitor load, an inductor Ln, etc., to raise the voltage Vop1. When the voltage Vop1 becomes the voltage V5 and rises to the voltage V6 by making the DC current of the current source 12 flow, the switch S4 is turned on, and the current of second half-wave resonance is made to flow by a resonance loop including a capacitor load, an inductor Ln, etc., to lower the voltage Vop1 to the voltage V1.SELECTED DRAWING: Figure 2

The application discloses a method for determining a modulation signal of optimal modulation depth of a reflective all-fiber current sensor, and amplitude U of a modulation signal corresponding to the optimal modulation depth H is determined by adjusting amplitude of a modulation signal of a phase modulator PM When the peak-to-peak value of the light power received by the photodetector is maximum and the number of extreme points in one period is 3, the amplitude U of the modulation signal corresponding to the modulation depth H = π rad is obtained PMπ Thus, the electro-optic modulation coefficient k of the phase modulator is determined AP When the optimal modulation depth H o = 1.84 rad, the amplitude of the modulation signal corresponding to the optimal modulation depth is U PMo The method realizes online measurement of the half-wave voltage of the phase modulator, determines the modulation signal corresponding to the optimal modulation depth through the theoretically optimal modulation depth, does not introduce additional devices, and is simple and convenient to operate; and the application is not limited to the reflective all-fiber current sensor, and is suitable for any interference optical path structure which needs to measure the half-wave voltage.

A 36-pulse hydrogen production converter based on a controllable pulse multiplication balancing reactor belongs to the field of power electronics technology. It addresses the problems of high input current THD and output voltage ripple, as well as the large number of high-current thyristors required in existing 24-pulse thyristor-rectified hydrogen production converters. The present invention constructs a 36-pulse hydrogen production converter consisting of a nine-phase half-wave thyristor bridge, an auxiliary single-phase thyristor rectifier bridge, and a balancing reactor with a secondary side. The controllable pulse multiplication balancing reactor is composed of the balancing reactor with a secondary side and the auxiliary single-phase thyristor rectifier bridge. By controlling the thyristors in the nine-phase half-wave thyristor bridge and the auxiliary single-phase thyristor rectifier bridge and rationally designing the primary and secondary winding turns ratios of the balancing reactor with a secondary side, a 36-pulse hydrogen production converter can be achieved. The rectifier solution of the present invention requires only 18 high-current thyristors and is primarily suitable for renewable energy hydrogen production applications with high power quality requirements.

A bidirectional vehicle charging circuit with a multi-phase bridge circuit having a first, a second, and a third half bridge is provided. A first connector is connected to the first and the third half bridge. A second connector is connected to the second and the third half bridge. A controller activates the first half bridge to convert a DC voltage into a first sinusoidal signal with positively offset negative half wave with a first amplitude. The controller activates the second half bridge to convert the DC voltage into a second sinusoidal signal with positively offset negative half wave with a second amplitude. The controller activates the third half bridge to convert the DC voltage into a square wave voltage with the potentials of the DC voltage as alternating square wave voltage level. The bridge circuit, once activated, generates one sinusoidal voltage with different amplitudes at the two connectors.

The utility model provides a high-gain double-antenna microwave detection device, which comprises a reference ground, a planar radiation source, a half-wave oscillator and an auxiliary oscillator, and is characterized in that the planar radiation source and the half-wave oscillator are arranged on the same side of the reference ground; a near-field medium space is defined by taking a physical center point of the planar radiation source as a sphere center and taking lambda / 2 as an inner radius and 3 lambda / 2 as an outer radius in an error range of + / -lambda / 4; wherein the auxiliary oscillator is completely or partially arranged in the near-field medium space around the directional radiation direction of the high-gain double-antenna microwave detection device, and is provided with at least one metal layer around the directional radiation direction of the high-gain double-antenna microwave detection device; the high-gain double-antenna microwave detection device can maintain a large beam angle while improving the gain, and is suitable for high installation application.