462 results about "DC bias" patented technology

The invention discloses a linear polarization in-band scattering reconfigurable radiation time-sharing regulation array antenna, which belongs to the technical field of antenna engineering, and comprises an antenna unit and a one-to-sixteen power divider, the antenna unit is connected with the one-to-sixteen power divider, and the antenna unit is connected with the one-to-sixteen power divider. The antenna unit comprises a first radiation patch, a first dielectric substrate, a second radiation patch, a second dielectric substrate, a feed coupling branch knot, a feed metal column, a third dielectric substrate, a perforated metal floor and a fourth dielectric substrate, and a first PIN tube, a second PIN tube, a feed transmission line, a direct current bias device, a reflective phase shifter and a low-pass filter are arranged at the bottom of the fourth dielectric substrate; the direct-current bias device is connected with the reflection type phase shifter and the feed transmission line through the low-pass filter, and the feed metal column sequentially penetrates through the third dielectric substrate, the perforated metal floor and the fourth dielectric substrate and is connected with the feed transmission line. According to the invention, the normal radiation efficiency of the antenna can be ensured, and the reconfigurability of antenna scattering can be effectively improved.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

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

The invention discloses a transmission type one-bit phase metasurface unit for 5G millimeter waves, and belongs to the field of reconfigurable metasurfaces. The two sides of the receiving patch of the unit are respectively bridged with two PIN diodes which are arranged in the same direction; the radiation patch is respectively connected with the receiving patch and the metal ground through the metal through hole and the metal blind hole; a direct-current bias microstrip circuit and a metal ground which are separated by a semi-solidified substrate are arranged between the two dielectric plates, and the direct-current bias microstrip circuit is connected with the two rectangular patches through metal blind holes. Therefore, the center of the receiving patch is equipotential with the metal ground, and the two sides of the receiving patch are equipotential with the direct-current microstrip circuit, so that the two PIN tubes are always in opposite conduction conditions when the voltage is changed. When the state changes, the induction current directions of electromagnetic waves on the upper surface receiving patch are opposite, and transmission electromagnetic waves excited on the lower surface radiation patch through the metalized through holes generate a phase difference approximate to 180 degrees. The one-bit transmission phase regulation of 5G millimeter waves is realized, and the method has important application prospects in the fields of wireless communication, beam forming and the like.

The invention provides an excitation amplitude automatic closed-loop control system and method for a DLCP test. The system comprises a multi-frequency alternating current excitation and direct current bias voltage applying module which is used for automatically applying alternating current excitation signals and direct current bias voltage signals according to a preset excitation amplitude sequence under a plurality of test frequencies; the PID closed-loop control module is used for performing closed-loop correction on the applied voltage according to the response of the test port of the tested semiconductor device, so that the condition of the applied voltage at the test port meets a preset requirement; the capacitance measurement module is used for acquiring an equivalent capacitance response signal of the tested semiconductor device; the capacitance test data caching module is used for performing associated marking and classified caching on the capacitance test data according to the test frequency, the excitation level and the bias voltage set point; and the main control module is used for coordinating automatic test processes under the conditions of a plurality of test frequencies and different excitation amplitudes and outputting corresponding capacitance test data so as to improve the consistency, stability and automation degree of the DLCP test.

The invention discloses a simulation analysis method and system for transformer vibration noise under direct current magnetic bias, and the method comprises the steps: building a transformer geometric model, and carrying out the mesh generation of the transformer geometric model; external excitation of the transformer is set in the field-circuit coupling model of the transformer under the direct-current magnetic bias condition, and magnetic density distribution of the transformer under different magnetic bias currents is obtained through simulation; in the transformer electromagnetic structure coupling model, calculating to obtain vibration acceleration of the transformer under different bias currents; the vibration acceleration of the transformer serves as excitation, and sound pressure levels around the transformer under different bias currents are calculated; and analyzing the influence rule of different bias currents on the vibration noise of the transformer through the characteristic quantity of the frequency spectrum signal. According to the invention, the vibration noise characteristics of the transformer under different magnetic bias currents can be accurately simulated, and technical support is provided for judging whether the transformer has a direct current magnetic bias phenomenon or not. The method can improve the evaluation efficiency and simulation accuracy, and improve the noise pollution and overall performance of the transformer.

The invention relates to the technical field of radio frequency integrated circuits, and discloses a low-noise voltage-controlled oscillator circuit which comprises a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration and a source electrode following low-noise bias circuit with digital calibration, the cross-coupled amplifier array is composed of a plurality of units, and the source electrode of the cross-coupled amplifier array suppresses low-frequency noise through a resistance-capacitance feedback network and receives a digital amplitude calibration signal so as to dynamically adjust the number of working units and stabilize the output amplitude; the amplitude self-calibration loop consists of digital logic and a peak detector; the switched capacitor unit array is provided with stable direct-current bias; and a wide linear variable capacitor array driven by the stepped bias voltage. Through deep fusion of digital and analog technologies, the phase noise is remarkably reduced, the linear tuning range is widened, the amplitude stability is ensured, the power consumption is reduced, and the method is particularly suitable for a high-performance radio frequency communication chip of the Internet of Things.

The invention belongs to the technical field of wireless optical communication, and particularly relates to a visible light communication method based on dynamic blocking bias, which specifically comprises the following steps: data acquisition and primary processing; processing and combining the signals; performing dynamic block time domain bias processing; signal receiving and primary processing; noise suppression processing; and demodulating and separating the signal. At a transmitting end, the ACO-OFDM signal, the PAM-DMT signal and the DCO-OFDM signal are mixed, so that the full utilization of subcarriers is realized, and the spectrum efficiency is remarkably improved. Meanwhile, the minimum time domain bias of each signal is calculated, a dynamic direct current bias sequence is constructed, real-time adjustment is carried out according to signal characteristics, the non-negativity of the signals is ensured, the average optical power of the system is effectively reduced, and the light energy utilization rate is improved. The spectrum efficiency and the light energy utilization rate of the visible light communication system are improved, and the method is also suitable for efficient and reliable visible light communication scenes.

The invention discloses a manufacturing process of a multi-layer insulation press-fit high-voltage-resistant printed circuit board, and relates to the technical field of high-voltage PCBs, and the manufacturing process comprises the steps: 1, taking target field intensity distribution and polarization response as traction, carrying out the reverse deduction of a thickness dielectric attribute and a segmentation sequence, forming a barrier layer stack parameter set version baseline, and taking the baseline as a manufacturing input; 2, formulating an interface activation strategy and a pressing program according to the base line, and implementing pre-drying, vacuumizing, isothermal permeation, sequential curing and controlled cooling and recording; and 3, detecting the dielectric agent amount and the discharge agent amount by using the verification sheet group, and comparing the baseline to generate a manufacturing release packet. 3, setting a field plate and a voltage-sharing pattern under the condition of keeping the base line, optimizing a conductor boundary and a via hole, and carrying out edge sealing and coating; the device is suitable for a scene where direct-current bias and high-frequency pulse coexist, and electric field peak clipping, interface stability, thickness uniformity and alignment control are achieved.

The invention discloses a digital-to-analog conversion circuit and a conversion method, and belongs to the field of circuit design. In order to solve the problems that the output amplitude of an existing digital-to-analog converter is fixed, and the resolution needs to be sacrificed or an additional circuit needs to be added during amplitude adjustment, the invention provides a novel circuit structure. On the basis that the circuit comprises a digital output module, a switch module and a weight circuit module, a high-level adjustable reference source and a low-level adjustable reference source are innovatively introduced. The switch module selectively connects the input node of the weight circuit module to the two adjustable reference sources according to the control signal of the digital output module. Therefore, the amplitude and the direct current bias of the output analog signal are directly determined by the voltage values of the two reference sources. According to the invention, the output signal range can be dynamically and flexibly adjusted on the premise that the resolution is not lost, and the bipolar signal can be conveniently generated, so that the system design is simplified, and the cost is reduced.

A calibration circuit and an electronic device belong to the technical field of detection, the calibration circuit is connected with a differential probe, and a sampling circuit performs voltage sampling on an output signal to output a sampling signal; the control circuit outputs a first control signal according to the sampling signal; the direct current bias calibration circuit outputs a first adjusting voltage according to the first control signal; the signal conditioning circuit is further configured to perform direct current bias compensation on the single-ended signal based on the first adjusting voltage so as to output an output signal; therefore, the direct-current bias of the whole system returns to zero, the dependence of system errors on the precision of resistors, capacitors and active devices is reduced, and the accuracy of measurement results is improved.

A non-interferometric thin film lithium niobate electro-optical modulator for data transmission including a laser, configured to generate an input continuous wave light beam; a non-interferometric thin film lithium niobate modulator including an optical waveguide situated along with the coplanar transmission lines and the DC bias conductors. The propagation constant of the optical waveguide is tuned and modulated by the RF data signal and the DC bias voltage traveling on the coplanar transmission lines and the DC bias conductors. The modulator can be tuned at quadrature point by the DC bias voltage. The optical power can be modulated by the RF data signal travelling on the coplanar transmission line; a low noise RF amplifier for data signal amplification; and a bias tee for combining the data signal and DC bias voltage and send them to the coplanar transmission lines.

The invention discloses a direct current magnetic bias tolerance evaluation method, device and equipment of a transformer and a storage medium, and relates to the technical field of power systems, and the method comprises the steps: processing an initial finite element model of a to-be-evaluated transformer to obtain a target finite element model; the method comprises the following steps: performing an experiment on a to-be-evaluated transformer to obtain a reference data set, converting model parameters into standard nominal values to determine a probability distribution result, sampling the to-be-evaluated transformer to obtain a sampling result, and extracting sample points in the result to obtain a parameter extraction result to generate target simulation data; correcting the simulation data based on the reference data set to obtain a correction result, establishing a transformer direct current prediction model, and predicting a working condition vector of the to-be-evaluated transformer to obtain a prediction output result; the prediction output result is inverted based on the actual data of the to-be-evaluated transformer to obtain the direct current magnetic bias current, the direct current magnetic bias tolerance evaluation result is obtained through evaluation, and the accuracy and rationality of transformer direct current magnetic bias tolerance evaluation are improved.

This application relates to a method, apparatus, device, and storage medium for determining DC bias magnetic information of a transformer. The method comprises: obtaining a vibration signal sequence of the transformer; extracting characteristic parameters of the vibration signal sequence; wherein the characteristic parameters include at least two of time domain characteristics, frequency domain characteristics, or time-frequency domain characteristics; and determining the DC bias magnetic information of the transformer based on the characteristic parameters. This method can accurately determine the DC bias magnetic information of the transformer.

The invention provides an external direct current bias device for a network analyzer and a test method thereof, and relates to the technical field of direct current bias, the external direct current bias device for the network analyzer comprises a test device, a tested device and an external direct current bias circuit; the external direct current bias circuit is arranged between the test equipment and the tested device; direct current bias supply and high-frequency test signal transmission control are carried out on the test equipment and the tested device through the external direct current bias circuit, the performance of the test equipment can be remarkably improved through the external direct current bias circuit, and the test intelligence and precision level of devices such as a signal inductor and the like is enhanced.

The invention discloses a W-band switching line MMIC phase shifter based on an aligned CNT Schottky diode. The phase shifter comprises a substrate, a radio frequency input port, a radio frequency output port, two transmission paths with different physical lengths, a switch selection network and a direct current bias circuit. Wherein the switch selection network adopts an aligned carbon nanotube Schottky diode and is configured at the input end and the output end of the transmission path. Complementary control voltage is applied through the direct-current bias circuit, the switch selection network is driven to enable the selected paths to be conducted at the two ends at the same time and the unselected paths to be cut off at the two ends at the same time, and therefore discrete switching of phases is achieved. The high-frequency characteristic of the aligned carbon nanotube device is combined with the double-end complementary selection topology, so that the problem that the amplitude imbalance and the phase precision are difficult to consider at the W wave band is effectively solved, the signal leakage and the parasitic resonance of a non-conducted branch are remarkably inhibited, and the low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss high-isolation low-insertion-loss low

A MEMS switch, a preparation method thereof, and an electronic apparatus. The MEMS switch includes: a substrate, a coplanar waveguide line structure disposed on a side of the substrate, an isolation structure disposed on a side of the coplanar waveguide line structure away from the substrate, a film bridge disposed on a side of the isolation structure away from the substrate. The coplanar waveguide line structure includes a first wire, a first DC bias line, a second wire, a second DC bias line and a third wire arranged at intervals sequentially. The second wire is one of an RF signal transmission line and a ground line, the first wire and the third wire are the other of the RF signal transmission line and the ground line. The film bridge is crossed between the first wire and third wire, and is connected with the first wire and the third wire respectively.

The present invention discloses a negative temperature drift bandgap reference circuit suitable for a large dynamic range logarithmic amplifier. The circuit relates to the field of integrated circuit technology and includes a startup circuit for providing a startup current; and a reference core circuit comprising a plurality of transistors and a plurality of resistors, the transistors being electrically connected to the resistors. The reference core circuit is configured to provide a reference voltage with a negative temperature coefficient, biasing a rectifier, thereby ensuring an extremely low DC bias current temperature coefficient of the rectifier at temperatures between -55°C and 125°C. Compared to conventional zero temperature coefficient bandgap reference circuits, the present invention is more suitable for large dynamic range logarithmic amplifiers, enabling them to exhibit excellent temperature characteristics, including slope and logarithmic consistency error.

The invention relates to the technical field of semiconductor laser control, and discloses an automatic frequency stabilization control system of a semiconductor laser, which comprises a lock-in amplifier used for demodulating a frequency discrimination signal; the modulation signal generator is used for outputting a sinusoidal signal or a cosine signal with the frequency of 100kHz and the peak-to-peak value of 40mV, and taking the sinusoidal signal or the cosine signal as a reference signal; the basic current and frequency sweep signal generator is used for adjusting the direct current offset, aligning a wave crest in a frequency discrimination error curve to a scanning midpoint, and outputting a sawtooth wave frequency sweep signal of which the peak value and the frequency can be adjusted; the PID controller is used for stabilizing the frequency discrimination signal to a saturation absorption peak corresponding value; and the automatic frequency stabilization state judgment and controller identifies a target saturated absorption peak through a two-stage peak searching algorithm, and locks the working frequency of the semiconductor laser on the frequency corresponding to the target saturated absorption peak. According to the invention, the operation process of the frequency stabilization system is simplified, and long-term stable operation of the semiconductor laser is ensured.

The invention relates to the technical field of antennas, in particular to a bandwidth-enhanced circularly-polarized reconfigurable microstrip antenna. Comprising a dielectric substrate and a metal floor attached to the lower surface of the dielectric substrate, and an annular patch, a driving branch knot, two parasitic branch knots and a direct current bias line are attached to the upper surface of the dielectric substrate. An inner conductor and an outer conductor of the coaxial cable are connected with the driving branch knot and the metal floor respectively, the driving branch knot excites a TM11 mode of the circular ring through an electric coupling path and excites a resonant mode of the parasitic branch knot through another magnetic coupling path, and the resonant parasitic branch knot excites another TM11 mode of the circular ring through electric coupling. And the circular polarization bandwidth with two axial ratio zero points is enhanced. The bias network controls the on-off of the diode on the parasitic branch knot through the DC voltage loaded by the coaxial cable so as to realize circular polarization reconfiguration. The antenna has the advantages of being compact in structure, enhanced in bandwidth, reconfigurable in circular polarization and low in profile, and compared with a circular polarization reconfigurable antenna of the same size, the bandwidth is expanded by more than one time, and the application range is wide.

Reciprocal quantum logic (RQL) bias-level sensors are fabricated on an RQL integrated circuit (IC) to sample AC or DC bias values provided to operational RQL circuitry on the RQL IC. The bias-level sensors, or samplers, include Josephson transmission lines (JTLs) or logic gates having strengthened or weakened bias taps as compared to bias taps of JTLs or logic gates in the operational RQL circuitry. Sampler JTLs or logic gates with weakened bias taps to AC clock resonators can have lower limits of their operational ranges placed near an optimal bias point at the centroid of the operating region of the operational RQL circuitry. Staging relative strengths of the bias taps of the samplers in an ensemble of samplers allows for outputs of wrapper circuitry to be indicative of whether a provided bias value is an improvement or optimization of the bias value when varied over a 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.

This invention relates to the field of power transformer protection technology, and discloses a transformer DC bias suppression system and method. The method includes collecting subway operation, power grid structure, and soil geological parameters; establishing a dynamic calculation model based on these parameters to generate distribution data of rail potential, stray current, and ground potential; constructing a bias assessment model to calculate the dynamic DC current flowing through the transformer neutral point and the excitation current distortion; using a random forest algorithm for evaluation, outputting a quantitative impact level and a set of key factors; and based on this level, key factors, and transformer grounding method, formulating a suppression strategy that includes configuration parameters of a silicon carbide PiN diode active suppression device and a grounding optimization scheme. This invention achieves accurate assessment and targeted suppression of DC bias problems caused by subways.

The present invention discloses an AC / DC converter and an AC / DC converter control method, relating to the field of power electronics technology. The present invention uses a Boost converter and an isolated hybrid bridge-type three-port converter to form two DC / DC converters, achieving AC / DC conversion without a rectifier bridge. Two ports of the isolated hybrid bridge-type three-port converter are connected in series, and a DC bias is provided for the input voltage of the Boost converter via one of the ports, so that the input voltage of the Boost converter is the sum of the voltage across the port and the AC input voltage. When the voltage across the port is greater than the AC input voltage, the input voltage of the Boost converter can be made into a fluctuating DC voltage, thereby avoiding the current distortion problem caused by the occurrence of zero crossings and reducing total harmonic distortion.

The invention discloses a CLCC converter transformer iron core state characteristic analysis method, system, medium and equipment, and the method comprises the steps: collecting a neutral point current signal of a converter transformer in real time in the operation process of a CLCC converter valve; performing wavelet multi-resolution analysis on the neutral point current signal, decomposing the neutral point current signal into an approximation coefficient and a detail coefficient, and reconstructing a high-frequency detail component to extract a transient direct current bias component; calculating a bias amplitude, a bias duration and a bias direction based on the transient DC bias component; evaluating the residual magnetism state and saturation tendency of the iron core according to the bias amplitude, the bias duration and the bias direction, judging that the iron core has positive saturation tendency when the bias direction is positive, and judging that the iron core has negative saturation tendency when the bias direction is negative; quantizing the residual magnetism level of the iron core based on the bias amplitude and the bias duration; and in combination with the operation parameters of the converter transformer, generating an iron core state evaluation report and outputting loss increase, anti-short-circuit capability decrease or insulation deterioration risk early warning.

The application discloses a transmitting local oscillator leakage correction method for a zero intermediate frequency system, which comprises the following steps: obtaining a first direct current bias signal of a zero intermediate frequency receiver according to a first positive signal and a first negative signal sent by a zero intermediate frequency transmitter; obtaining an amplitude attenuation parameter alpha and a phase deviation parameter of a second positive signal between the zero intermediate frequency receiver and the zero intermediate frequency transmitter according to the first direct current bias signal and the second positive signal, wherein the second positive signal is obtained by applying a strong direct current signal to an I path of the zero intermediate frequency transmitter; obtaining a second direct current bias signal based on the amplitude attenuation parameter alpha and the phase deviation parameter; superimposing a third direct current bias signal opposite to the second direct current bias signal on the zero intermediate frequency transmitter to complete the correction of the transmitting local oscillator leakage. Compared with the prior art, the application uses a relatively simple algorithm to solve the transmitting local oscillator leakage problem in the zero intermediate frequency transceiver, saves time and hardware resources, and can be used for the initialization correction and tracking correction of the transmitting local oscillator leakage.

The application discloses a linear polarization in-band scattering reconfigurable radiation time-sharing control array antenna and belongs to the technical field of antenna engineering, which comprises an antenna unit and a one-to-sixteen power divider, wherein the antenna unit is connected with the one-to-sixteen power divider; the antenna unit comprises a radiation patch one, a dielectric substrate one, a radiation patch two, a dielectric substrate two, a feed coupling branch, a feed metal column, a dielectric substrate three, a metal floor with holes and a dielectric substrate four; the bottom of the dielectric substrate four is provided with a PIN tube one, a PIN tube two, a feed transmission line, a DC biasing device, a reflective phase shifter and a low-pass filter; the DC biasing device is connected with the reflective phase shifter and the feed transmission line through the low-pass filter; and the feed metal column passes through the dielectric substrate three, the metal floor with holes, the dielectric substrate four in sequence and is connected with the feed transmission line. The application can not only guarantee the normal radiation efficiency of the antenna, but also effectively improve the reconfigurability of the antenna scattering.

The application relates to the technical field of intelligent sensor calibration and characteristic parameter quantification, and discloses a sensitivity coefficient quantitative calibration method of an intelligent sensor. Original output voltages are collected in sequence at different inclination positions and direct current bias is removed, a multilayer exponential smoothing kernel is adaptively constructed based on the maximum span and the minimum adjacent difference of the voltage sequence, and the signal is subjected to multiscale smoothing; the gradient of each layer of the smoothed voltage sequence is extracted by adopting central difference and end point difference respectively, and the maximum gradient and the corresponding inclination value are extracted in each layer as the local sensitivity; the sensitivities of the layers are arithmetically averaged to obtain the comprehensive sensitivity coefficient; finally, the prediction output and the real inclination residual are calculated by combining the verification data, and whether the calibration is qualified is judged according to the preset root mean square error threshold value; when the calibration is unqualified, sample points are supplemented or the smoothing parameter is adjusted to perform iteration.