291 results about "Dc bias voltage" patented technology

The invention discloses an anti-electromagnetic interference high-precision current sensing circuit and a current sensor, and relates to the technical field of current measurement. The system comprises a signal conditioning circuit used for carrying out voltage division on power supply voltage to obtain direct current bias voltage, superposing the direct current bias voltage with a sensor signal collected by a TMR sensor, carrying out amplification processing on the superposed sensor signal, and transmitting the amplified sensor signal to a signal filtering circuit; the signal filter circuit is used for filtering interference signals and clutters of the amplified sensor signals, and the filtered sensor signals are sent to the MCU for signal processing. The anti-electromagnetic interference high-precision current sensing circuit has the beneficial effects that firstly, the anti-electromagnetic interference high-precision current sensing circuit analyzes related interference sources and propagation paths of electromagnetic interference in a power grid operation environment, optimizes and selects types of electronic components and device layout, and effectively reduces the interference of the electromagnetic interference on the current sensing circuit; secondly, a hierarchical protection system structure is followed, and the influence of electromagnetic interference on a measurement circuit is reduced;

A control method and system for a resonant converter. The control method for a resonant converter comprises: in each switching cycle, determining a target power value on the basis of an input power control amount and a compensation amount corresponding to a bridge leg (S101); on the basis of the target power value, an input voltage, circuit parameters of the resonant converter, and the current operating mode of a full-bridge inverter module, determining a target slope control amount corresponding to a counter which corresponds to a switching transistor (S102); determining a comparison threshold on the basis of the target slope control amount, the current count value of the counter which corresponds to the switching transistor, and a DC bias voltage of a resonant capacitor corresponding to the current operating mode, wherein the counter starts counting using the DC bias voltage as an initial value in each switching cycle until the actual voltage of the resonant capacitor is equal to the comparison threshold (S103); and determining a control signal on the basis of the actual voltage of the resonant capacitor and the comparison threshold, and controlling the switching transistor on the basis of the control signal (S104).

The invention discloses a thyristor failure test device, which relates to the technical field of thyristor life test, and comprises a power supply, a protective resistor, an artificial neutron source, a data acquisition device and a processing module, and is characterized in that the power supply is used for providing direct current bias voltages with different sizes and different polarities for a sample thyristor; the artificial neutron source is used for enabling random single-particle burnout events to occur in the sample thyristor; the protection resistor is used for limiting main loop current; the data acquisition equipment is used for acquiring bias voltage signals on the sample thyristors in real time; and the processing module is used for recording the occurrence time of the single-particle burnout event according to the bias voltage signal on the sample thyristor when the single-particle burnout event occurs in the sample thyristor, and fitting the occurrence time of the single-particle burnout event and the corresponding bias voltage signal to obtain the failure rate of the thyristor. According to the invention, the condition of irradiation failure of the thyristor under voltage bias under the actual working condition can be truly reflected.

The invention discloses a voltage transformer direct current bias test device for photovoltaic power generation and a control method thereof in the field of electrical measurement. The device and the control method thereof comprise a first voltage regulator, an alternating current booster, a direct current voltage source and a voltage divider for monitoring. The components form a direct current bias voltage source which is connected with a primary coil of a voltage transformer for photovoltaic power generation in parallel and applies direct current bias power frequency test voltage, a second alternating current voltage source is connected with a standard voltage transformer in parallel and applies processing frequency alternating current test voltage, and a voltage divider for monitoring monitors voltage output by the direct current bias voltage source. Secondary coil output voltages of a tested mutual inductor and a standard mutual inductor, a voltage of a primary current flowing through a sampling resistor and an output voltage of a voltage divider are measured and input to a voltage transformer direct current bias performance measurement unit; and obtaining an error of the tested voltage transformer for photovoltaic power generation under a direct current bias condition, a primary current waveform, and a power frequency alternating current component and a direct current bias component of output voltage of a direct current bias voltage source.

The invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

A method for harmonic trapping in a matching network of a power amplifier includes determining primary inductance and secondary inductance of a differential transformer of the matching network, based on a signal operating frequency of the power amplifier. An inductance value for an L-C filter is determined based on the secondary inductance and a harmonic frequency of a local oscillator (LO) signal. A capacitance value for the L-C filter is determined based on the inductance value and the harmonic frequency of the LO signal. The L-C filter is provided on an electric connection between a direct current (DC) bias voltage source and a secondary inductor of the differential transformer. The L-C filter is configured with the determined inductance value and the determined capacitance value.

The invention discloses a CMOS power amplifier which comprises a transconductance tube and a common gate tube, the transconductance tube comprises a first CMOS transistor and a second CMOS transistor, the common gate tube comprises a third CMOS transistor and a fourth CMOS transistor, and sources of the first CMOS transistor and the second CMOS transistor are grounded respectively to form a pseudo differential pair; the drain electrode of the first CMOS transistor and the drain electrode of the second CMOS transistor are connected with the source electrode of the third CMOS transistor and the source electrode of the fourth CMOS transistor respectively to form a common-gate structure. A pre-stage driving amplifier of the CMOS power amplifier outputs a main path and an auxiliary path, the main path is connected with the grid electrode of the first CMOS transistor and the grid electrode of the second CMOS transistor through AC double capacitors, and the auxiliary path outputs direct current bias voltage through an envelope detection circuit to be connected to the grid electrode of the third CMOS transistor and the grid electrode of the fourth CMOS transistor.

The invention provides a low-frequency measurement amplifying circuit for suppressing direct-current bias voltage and noise. The low-frequency measurement amplifying circuit is mainly used for reducing the direct-current bias voltage and suppressing interference of low-frequency and high-frequency noise of the circuit. The scheme of the invention comprises a low-pass filtering module, a charge conversion module, a multi-gear gain adjustment module and an output signal protection module. High-frequency noise of weak charge signals generated by the piezoelectric sensor is filtered out through the low-pass filtering module, then the charge signals are converted into voltage signals through the charge conversion module, the voltage signals are amplified according to different proportions through the multi-gear gain adjusting module, and finally the converted and amplified voltage signals are output through the output signal protection module. Compared with the prior art, the low lower limit cut-off frequency is achieved, meanwhile, the direct current bias voltage and noise generated by the circuit are reduced, a band elimination filter is formed through circuit design, the influence of low-frequency and high-frequency interference signals is restrained, and the quality of output signals is improved.

The invention belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

The invention discloses a preparation method of a high-quality self-supporting polycrystalline diamond substrate. The preparation method comprises the following steps: obtaining a larger first substrate and a smaller second substrate; the molybdenum substrate is a polished molybdenum metal substrate; sowing diamond seed crystals on the first substrate by using an ultrasonic sowing method, and growing a nanocrystalline diamond epitaxial layer by using a CVD (Chemical Vapor Deposition) process; cutting the first substrate by using precise laser to obtain an annular polycrystalline diamond solid seed crystal of which the inner diameter is greater than that of the second substrate; placing a second substrate in the inner diameter of the second substrate, guiding generated tiny diamond grains to the second substrate through a boundary induction mechanism and applying direct current bias voltage, and uniformly wrapping the tiny diamond grains to form a self-supporting polycrystalline diamond substrate; according to the preparation method of the self-supporting polycrystalline diamond substrate, the orientation consistency and the crystallization quality of a diamond film are remarkably improved, and the prepared self-supporting polycrystalline diamond substrate has the advantages of being low in surface roughness, compact in structure, simplified in follow-up process and the like.

The invention discloses a receiving and transmitting integrated detection system based on a CMUT sensor. The system comprises a DC bias voltage supply module, a CMUT detection module, a CMUT detection module, a CMUT detection module and a CMUT detection module, the system power supply module is used for supplying power; the PC upper computer end is used for generating upper computer data; the data communication module is used for transmitting data of the upper computer; the FPGA gating signal control module is used for receiving data of the upper computer and processing and distributing the data; the high-voltage pulse circuit generation module is used for selectively starting corresponding n paths of high-voltage pulse excitation signals according to the gating signal; the time division multiplexing circuit module is used for expanding n paths of high-voltage pulse excitation signals to 2n paths of high-voltage pulse excitation signals; the LC impedance matching module is matched with a specific transducer; an echo signal amplification module for secondary amplification; and the analog-to-digital conversion module is used for quantifying the echo data after secondary amplification. According to the invention, multi-channel synchronous driving of the array CMUT sensor can be realized, mutual crosstalk between different channels can be suppressed, and delay caused by different path lengths can be suppressed.

The invention discloses a wide-temperature-range solid insulation space charge measurement method, and belongs to the technical field of electrical insulation test and dielectric physical measurement. A solid insulation sample is mounted between double-layer composite electrode modules in a closed high-low temperature test cavity, and a flexible compensation gasket is adopted to absorb thermal expansion difference; a PID closed-loop control system is utilized to realize accurate and stable control of the temperature of the sample in a wide temperature range; applying a direct-current bias voltage and pulse voltage superposition signal, and collecting an acoustic signal generated by space charge displacement through a wide-temperature-range PVDF piezoelectric sensor module; and based on a sound velocity and sensitivity temperature calibration curve established by a pre-experiment, carrying out deconvolution processing on a sound wave signal to correct a temperature dependence error, and finally obtaining accurate space charge density distribution at different temperatures. According to the invention, the precision and reliability of space charge measurement of the solid insulating material in a wide temperature range are effectively improved.

A communication system includes a passive quadrature generator connected directly to an in-phase (I) mixer and a quadrature (Q) mixer, an I LO amplitude detect circuit connected to the passive quadrature generator and connected to the I mixer, and a Q LO amplitude detect circuit connected to the passive quadrature generator and connected to the Q mixer, the I LO amplitude detect circuit configured to detect an I LO amplitude and the Q LO amplitude detect circuit configured to detect a Q LO amplitude, and a combining and integrating circuit configured to receive the detected I LO amplitude and the detected Q LO amplitude and generate an I LO DC bias voltage to bias the I mixer and a Q LO DC bias voltage to bias the Q mixer.

The invention relates to the technical field of semiconductor photoelectric detectors, in particular to a surface acoustic wave ultraviolet detector and a preparation method thereof. The detector comprises a substrate, an epsilon-phase gallium oxide layer and a metal electrode layer which are arranged from bottom to top, the metal electrode layer comprises two groups of energy converters and reflecting gratings which are symmetrically arranged, the energy converter at one end is used for receiving radio frequency signals, and the energy converter at the other end is used for connecting direct current bias voltage. According to the surface acoustic wave ultraviolet detector, the interaction of the acoustic-electric effect and the piezoelectric effect of the surface acoustic wave is utilized. The method has the advantages that on one hand, technical means such as doping, surface treatment or high-temperature annealing do not need to be introduced into the epsilon-phase gallium oxide film; and on the other hand, one end of the transducer is used for receiving a radio frequency signal, the excited surface acoustic wave is propagated in the epsilon-phase gallium oxide layer, and the surface acoustic wave with a specific frequency is selectively enhanced when the surface acoustic wave reaches the reflecting grating. The surface acoustic wave can promote the separation of photon-generated carriers and inhibit electron-hole recombination, thereby effectively improving the performance of the detector.

The present invention relates to a metal bipolar plate coating resistant to high potential corrosion and a preparation method thereof. The prepared carbon film includes a first carbon layer located inside and a second carbon layer located on the surface. Among them: the first carbon layer uses an arc bend tube magnetic filter coil to emit carbon cations, and the carbon cations are accelerated with a DC bias under preset conditions to strengthen the role of chemical bonds in interface bonding. Ti metal and carbon cations are synthesized into TiC. At the same time, by adjusting the current density applied to the metal bipolar plate, excessive graphitization transformation of the first carbon layer is avoided, so that the TiC phase and sp3 phase at the interface are significantly more than the sp2 phase, thereby improving the high potential corrosion resistance of the first carbon layer and the Ti-C interface. The second carbon layer is a conductive layer, and a low duty cycle and a high pulse bias are used to achieve a low resistance effect. Finally, a metal bipolar plate carbon-based coating that can withstand long-term high potential corrosion and has excellent contact resistance characteristics is obtained.

The invention discloses a direct current bias voltage control device and control method, electronic equipment and a storage medium. The direct current bias voltage control device comprises an electrostatic chuck which adsorbs a wafer; a lower radio frequency power supply and a lower matcher, wherein the lower radio frequency power supply is connected with the lower matcher; the voltage sensor is arranged at the bottom of the electrostatic chuck, the voltage sensor is connected with the electrostatic chuck and the lower radio frequency power supply, and the voltage sensor obtains a voltage signal of the electrostatic chuck to the ground, converts the voltage signal into an analog quantity voltage signal and transmits the analog quantity voltage signal to the lower radio frequency power supply; the lower radio frequency power supply processes the received analog quantity voltage signal to obtain a direct current bias voltage, the direct current bias voltage is compared with a preset voltage value, and the output power of the lower radio frequency power supply is adjusted to enable the direct current bias voltage to be equal to the preset voltage value. According to the invention, the output power is stable and does not fluctuate greatly, reliable power output is provided, and adverse effects on a process result are avoided.

The invention relates to a terahertz absorption spectrum enhancing device based on a sawtooth structure on a coplanar waveguide, and relates to the technical field of terahertz. Comprising a dielectric substrate, a photoconductive antenna structure and a coplanar waveguide arranged on the dielectric substrate, the grounding wires on the two sides of the middle of the coplanar waveguide are provided with sawtooth structures and are symmetrically distributed relative to the middle signal line. A photoconductive antenna structure is embedded in one side of the middle signal line, and direct-current bias voltage is arranged at the two ends of the middle signal line. According to the invention, local electric field enhancement can be realized, interaction between terahertz waves and an object to be detected is enhanced, and high-sensitivity detection in a terahertz range is realized.

A silicon-based electro-optic phase modulator, a chip, and an electro-optic phase modulation system. The silicon-based electro-optic phase modulator comprises a substrate (10), an optical waveguide layer (20) stacked on the substrate (10), and an electrode layer (30); the optical waveguide layer comprises a first doping region (21), and a first PN junction (22) and a second PN junction (23) which are connected in series; and the electrode layer (30) comprises a first electrode (31), a second electrode (32) and a third electrode (33). The first PN junction (22) is of a convex structure, one end of the first PN junction (22) is connected to the first doping region (21), and the other end of the first PN junction is connected to the second PN junction (23); and the carrier doping concentration of the first PN junction (22) is less than the carrier doping concentration of the second PN junction (23), and is less than the carrier doping concentration in the first doping region (21).The first doping region (21) is connected to the first electrode (31); and the end of the second PN junction (23) distant from the first PN junction (22) is connected to the second electrode (32), and the end of the second PN junction (23) close to the first PN junction (22) is connected to the third electrode (33). The first electrode (31) and the second electrode (32) are respectively used for receiving a radio frequency signal and grounding, and the third electrode (33) is used for receiving a direct current bias voltage. The technical solution can reduce the static power consumption and the packaging cost of the silicon-based electro-optic phase modulator.

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 an X7R barium titanate-based dielectric ceramic material with high bias stability and reduction resistance, the chemical composition expression of the material is BaTiO3-aMnO2-bCaZrO3-cSiO2-xmol% Yb2O3, in the formula, a is 0.005 to 0.01, b is 0.02 to 0.06, c is 0.005 to 0.02, and 0.5 lt; xlt; 3. The particle size of the X7R barium titanate-based dielectric ceramic material after sintering can be as small as 200nm, the X7R barium titanate-based dielectric ceramic material is very beneficial to the demand of miniaturized MLCC, not only has high bias stability and reduction resistance, but also has high resistivity and low loss, the ceramic resistivity reaches 1011 omega.cm, the dielectric constant is up to 1400 or above, the temperature stability TCC is less than or equal to 15% in the range of-55 DEG C to 125 DEG C, the X7R standard is met, and the dielectric ceramic material has good application prospects. The loss is lower than 1%, and the direct-current bias stability is lower than 7%. A solid phase method is used for preparation, and the method is simple in process, environmentally friendly, good in repeatability, moderate in cost and suitable for industrial production.

The invention relates to the technical field of wireless communication, and provides a power amplifier module which comprises an input matching circuit, a first-stage amplifier, a first inter-stage matching circuit, a second-stage amplifier, a second inter-stage matching circuit, a third-stage amplifier and an output matching circuit which are electrically connected in sequence. The output matching circuit is connected to a load; the power amplifier further comprises a control module and a direct-current power supply module. The direct-current power supply module is used for supplying power to the control module, the first-stage amplifier, the second-stage amplifier and the third-stage amplifier. The input end of the control module is used for receiving an external logic enable signal and controlling the direct-current power supply module to provide direct-current bias voltage for the first-stage amplifier, the second-stage amplifier and the third-stage amplifier according to the external logic enable signal. The power amplifier module can improve the PVT index performance of the power amplifier and improve the communication quality.

The invention discloses a digital multi-channel nonlinear online correction circuit and method. The digital multi-channel nonlinear online correction circuit comprises a signal bias conditioning module, a high-speed AD conversion module and a digital signal processing module. The correction method comprises the steps of obtaining an energy spectrum accumulation result of an input pulse signal and performing normalization processing, then obtaining a channel address imax where pemax with the maximum incident particle energy distribution probability is located through an energy spectrum peak searching algorithm, and setting the DAC conversion circuit by taking a pulse signal amplitude corresponding to the channel address as a digital quantity for direct current bias adjustment. Correspondingly adding imax to the energy spectrum acquisition threshold value, and repeating the steps until the amplitude corresponding to the energy spectrum peak value of the input pulse signal exceeds the full scale amplitude of the sampling ADC; and then each sampling channel address of the ADC is corrected, and a result is output. According to the invention, by adjusting the DC bias voltage of the pulse signal, the nonlinear correction parameter of each sampling channel address of the ADC is obtained through online calculation, and the precision of digital multi-channel sampling measurement is improved.

The application discloses an implementation device and method of a controllable nonreciprocal circuit, and the device comprises a vector network analyzer, a left coupling capacitor, a right coupling capacitor and a nonlinear LC resonant cavity, wherein the resonant frequency of the nonlinear LC resonant cavity is jointly regulated by a direct current bias voltage loaded on a varactor diode and a microwave signal. The application utilizes the difference in coupling efficiency of microwave energy coupled into the nonlinear LC resonant cavity when the microwave signal is transmitted forward and reversely, and utilizes the regulation of the direct current bias voltage on the nonlinear interaction between the microwave signal and the LC resonant cavity mode in the nonlinear LC resonant cavity, so that the nonlinear LC resonant cavity can be in different bistable states when the microwave signal is transmitted forward and reversely, and thus the controllable nonreciprocal transmission with high contrast can be realized for the microwave signal in a larger working bandwidth.

The application discloses an online permanent magnet flux identification method of a permanent magnet synchronous motor considering cross coupling effect and belongs to the permanent magnet flux identification technology of the permanent magnet synchronous motor. The application aims at solving the problem that the existing permanent magnet synchronous motor flux identification method does not consider the cross coupling influence of the motor, thereby causing the error of the flux observation result to be large. The application comprises the following steps: under the online stable working condition of the motor, injecting a sinusoidal current signal into the dq axis of the motor to realize three-phase direct current signal injection; calculating the motor stator resistance; injecting two groups of direct current bias voltage into the d-axis of the motor through the current loop, establishing three motor voltage equations, and then obtaining two motor voltage difference equations which eliminate the flux terms; solving to obtain the motor d-axis self-inductance L d and the motor dq-axis mutual inductance L dq ; establishing the dq-axis voltage equation considering the cross coupling, calculating the motor permanent magnet flux based on the motor stator resistance, the motor d-axis self-inductance L d and the motor dq-axis mutual inductance L dq . The application is used for the online identification of the permanent magnet flux of the permanent magnet synchronous motor.

The invention discloses a millimeter-wave oriented 1-bit transmission phase modulation metasurface unit, comprising an upper substrate and a lower substrate; the upper substrate has a top patch, and the lower substrate has a bottom patch; both patches are rectangular ring structures; the center of the top patch has a connection patch, and a PIN radio frequency switch is connected between the short side line of the top patch and the connection patch; the short side line of the bottom patch is connected to the rectangular patch; a metal stratum is provided between the two substrates, and a narrow gap with a through hole is provided on the stratum; one side line of the two patches is connected to the stratum through a first metal via hole, and the other side lines are connected to the stratum through a second metal via hole, and the connection patch is connected to the rectangular patch through a third metal via hole passing through the stratum through hole. The relative DC bias voltages of the via holes on both sides and the middle via hole are adjusted, and the two PIN radio frequency switches are controlled to be in opposite states, respectively, so that the metasurface unit presents two states, which is equivalent to the top patch being physically rotated 180°, thereby realizing 1-bit transmission phase modulation.

The present application relates to the technical field of quantum precision measurement, in particular to a Roland C signal receiving method and system based on Rydberg atoms, which utilizes atomic antennas to prepare Rydberg atoms in an alkali metal atom gas chamber to obtain an electromagnetically induced transparency (EIT) spectrum; a Roland C signal reaches the alkali metal atom gas chamber through free space, and the EIT spectrum produces an oscillation peak by utilizing the Stark effect of the Rydberg atoms; the coupling laser frequency is locked to the maximum position of the oscillation peak amplitude; by applying a direct current bias voltage to the parallel electrodes built in the alkali metal atom gas chamber, on the one hand, the received Roland C signal is corrected, and on the other hand, the alternating current Stark effect is amplified, so that the receiving sensitivity of the Roland C signal is significantly improved.

The invention provides a spaceborne fiber-optic gyroscope and an on-orbit regulation and control method thereof, and relates to the technical field of fiber-optic gyroscopes, a circuit part of the spaceborne fiber-optic gyroscope comprises a signal processing unit, an optical power detection unit and an optical power regulation and control unit; the signal processing unit receives superposed signals which are output by the optical path part and contain direct-current bias voltage and high-frequency alternating-current voltage for signal conditioning, the conditioned high-frequency alternating-current voltage is converted into digital angular velocity signals, and the direct-current bias voltage is extracted from the superposed signals through the optical power detection unit. The direct-current bias voltage is amplified and converted into a digital optical power signal, the digital optical power signal and / or the digital angular velocity signal are / is sent to a satellite service computer through an optical power regulation and control unit, and the optical power regulation and control unit is further used for responding to an optical power regulation and control instruction which is forwarded by the satellite service computer and generated by a ground station. And generating a driving current to adjust the output light power of the light path part until the precision of the spaceborne fiber-optic gyroscope meets the satellite service requirement.

The present disclosure provides a method for measuring DC bias aging characteristics of a multilayer capacitor, the method comprising: applying a first polarization voltage to the multilayer capacitor, the multilayer capacitor comprising a body and an external electrode, a body having a dielectric layer including a plurality of dielectric grains and internal electrodes disposed alternately with the dielectric layer in a first direction, the external electrodes disposed on the body; maintaining the first polarization voltage for a first time period (t1); applying a DC bias voltage lower than the first polarization voltage; maintaining the DC bias voltage for a second time period (t2); and measuring a saturation capacitance after the DC bias voltage is applied.

The invention discloses a control method, a control device, an integrated circuit control chip and a switching power supply, and the method comprises the steps: level shift: receiving a sampling voltage signal representing the size and change trend of a whole-period resonance current in a resonant cavity of a resonant converter, the sampling voltage signal is boosted into a first voltage signal which is all positive voltage, and a direct-current bias voltage signal is generated at the same time; a charge signal generation step of generating a charge signal representing the power transmission quantity of the resonant converter according to the first voltage signal and the DC bias voltage signal, the charge signal including a slope compensation component with a set proportion; and a feedback control step of controlling the switching circuit according to the charge signal and the feedback voltage signal to realize energy conversion. According to the invention, the design difficulty and design cost of the integrated circuit control chip can be reduced, and the applicability of the integrated circuit control chip can be improved.

The invention belongs to the technical field of capacitive MEMS ultrasonic transducers, and discloses a magnetic film MEMS ultrasonic transducer which comprises a first magnetic insulating film, a supporting column layer is arranged on the upper surface of the first magnetic insulating film, and a second magnetic insulating film serving as a vibration film is arranged on the upper surface of the supporting column layer. A vacuum cavity is formed among the first magnetic insulating film, the strut layer and the second magnetic insulating film, an upper electrode is arranged on the upper surface of the second magnetic insulating film and above the vacuum cavity, and a silicon substrate serving as a lower electrode is arranged on the lower surface of the first magnetic insulating film. The first magnetic insulating film and the second magnetic insulating film attract each other through magnetism. According to the invention, by using the magnetic attraction force between the first magnetic insulation film and the second magnetic insulation film, the downward bending of the vibrating diaphragm can be realized, which is the same as the effect obtained by applying the same direct current bias voltage, so that the required direct current bias voltage is effectively reduced.