54results about How to "Suppress ringing" patented technology

An optical deflector is provided which can effectively suppress occurrence of a ringing phenomenon when a piezoelectric actuator is driven with a voltage signal of a sawtooth waveform. An optical deflector A1 includes a control circuit 20 that detects a mechanical natural frequency relevant to swinging about a second axis X2 of a movable part 9. The control circuit 20 applies a voltage signal of a sawtooth waveform from which the natural frequency and a harmonic component thereof are removed to outside piezoelectric actuators 10a and 10b. The control circuit 20 removes a frequency component, which is equal to or greater than a second threshold value G2 within a predetermined frequency range out of frequency components of a voltage signal output from a detecting piezoelectric body 62, from a drive voltage.

In a switching circuit in which a power semiconductor switching element and a unipolar type diode are connected in parallel, the noise due to ringing is reduced. When the main circuit current flowing is equal to or less than a predetermined value, an Si-IGBT is switched and driven by a gate resistance. In this case, when the main circuit current detected is equal to or more than a threshold value, a main circuit current detection circuit changes a gate resistance switching pMOS from ON state to OFF state. Accordingly, the Si-IGBT operates with a summation of a gate resistance and a gate resistor. More specifically, a gate resistance value of a gate drive circuit of the Si-IGBT increases. Therefore, dv / dt of the collector-emitter voltage of the Si-IGBT, i.e., the recovery dv / dt of the unipolar type diode, is small, and therefore, the noise due to ringing can be reduced.

The invention discloses a method for reconstructing a single-image super-resolution based on a double-layer model. The method comprises the following steps: (1) using the L0 gradient minimizing method and a HoG operator to generate K training clusters, then training corresponding dictionary pairs of the clusters, (2) selecting a geometrical dictionary pair corresponding to a low-resolution image block for testing in a self-adapting mode according to the HoG operator, solving a high-resolution line detail image corresponding to a low-resolution image, (3) using the L0 gradient minimizing method to solve a high-resolution edge structure image corresponding to the low-resolution image for testing, (4) adding the solved high-resolution line detail image to the high-resolution edge structure image to obtain an initial high-resolution image, and (5) carrying out global restriction and local restriction on the initial high-resolution image to obtain a final high-resolution image. According to the method for reconstructing the single-image super-resolution based on the double-layer model, a reconstructed image contour is clear, detail information is abundant, and quality of the reconstructed image is improved.

The invention discloses a video super-resolution reconstruction method based on adaptive interpolation kernel learning, comprising obtaining the interpolation kernel dictionary of a high resolution image block and a corresponding dual matrix according to a video image training set, wherein the video image training set comprises high and low resolution image blocks; obtaining the interpolation kernel of an image block structure corresponding to each atom in the interpolation kernel dictionary of a high resolution image block according to the interpolation kernel dictionary of the high resolution image block; and constructing the interpolation kernel of image small blocks of an image to be processed, and utilizing the interpolation kernel of image small blocks of the image to be processed to amplify the interpolation of the image to be processed according to the dual matrix and the interpolation kernel of an image block structure corresponding to each atom. The method at least partially better maintains edge and texture information in a video image, and effectively reduces distortion interference of aliasing, sawtooth, ringing, etc.

A mounting structure includes a first ceramic electronic component including a ceramic body including internal electrodes and outer electrodes. When a voltage is applied to the outer electrodes, the ceramic body is strained with a first strain amount, and a second ceramic electronic component including a ceramic body including internal electrodes and outer electrodes. When a voltage is applied to the outer electrodes, the ceramic body is strained with a second strain amount greater than the first strain amount. The second ceramic electronic component is arranged above the first ceramic electronic component, and the first and second ceramic electronic components are connected to each other via each other's outer electrodes. The first ceramic electronic component to which the second ceramic electronic component is connected is connected to a land on a circuit substrate via the outer electrodes of at least the first ceramic electronic component.

The purpose of providing an integrator circuit capable of alleviating disturbance of a current waveform of a current source DA converter is to improve the SNR of, for example, a ΔΣ modulator. An integrator circuit having an operational amplifier (102) with a feedback path (F1, F2) provided in parallel between an output terminal and an inverting input terminal of the operational amplifier (102). In the feedback path (F1), an integral capacitive element (105) and at least one resistive element (107) are arranged in series, and in the feedback path (F2), a second integral element having a capacitance smaller than the integral capacitive element (105) is provided. Capacitive element (106).

A power conversion device is capable of achieving three requirements to restrict a surge voltage, ensure high radiation performance of SW elements, and restrict ringing at the same time. In a power conversion device, element modules of two SW elements are stacked in a thickness direction via an insulating layer in such a manner that lateral surfaces are aligned parallel to each other in a same orientation, and a positive terminal of one SW element and a negative terminal of the other SW element are disposed so as to overlap each other in the thickness direction.

The invention provides a method for measuring a signal phase difference, which comprises the following steps: A) forming a three-dimensional observation signal matrix X(n) by a one-dimensional measured signal and two one-dimensional standard sine reference signals, wherein the measured signal contains a single-frequency sine measured signal and a noise signal; B) performing optimizing iterative operation for the first time on the observation signal matrix X(n), thereby obtaining a 3*3 separating matrix W1 and a three-dimensional source component matrix S(n); C) judging a row k in which a noise component Ig(n) in the source component matrix S(n) is located; D) when k is equal to 1, executing the step G); G) selecting two elements alpha and beta from a mixed matrix A, and linearly adding and multiplying with a sine component and a cosine component in the source component matrix, thereby obtaining the single-frequency sine measured signal in the measured signal, wherein the mixed matrix A is an inverse matrix of the separating matrix; and H) performing the phase difference measurement through the obtained single-frequency sine measured signal. According to the method provided by the invention, the demand on SNR (Signal to Noise Ratio) of the to-be-measured signal is reduced and the applicability of the to-be-measured signal is increased.

The invention belongs to the technical field of image processing, and discloses a saturated image deblurring method and system based on a nonlinear degradation model, and the method comprises the steps: inputting a saturated blurred image or a common blurred image and a blurred kernel corresponding to the blurred image; constructing a nonlinear blurred image degradation model according to a saturated image degradation mechanism; constructing a saturated image nonlinear deconvolution framework according to the obtained degradation modeling and the maximum posterior probability framework; determining a priori item, and constructing a nonlinear energy functional model by adopting total variation priori; and solving the nonlinear energy functional through an exchange direction multiplier algorithm, namely an ADMM algorithm or a split Bregman algorithm to obtain a clear image x to be restored. According to the method, the saturated nonlinear degradation characteristic is modeled, blurring in the saturated image is removed, the ringing phenomenon caused by errors of saturated pixels is effectively restrained, and a high-quality clear image is obtained through restoration.

The invention relates to a super-resolution reconstruction optimization recovery method for under-sampled degraded images, and belongs to the field of image processing. The method comprises the steps of reading out multi-frame under-sampled degraded image sequences, and establishing an image degradation model of the multi-frame under-sampled degraded image sequences; carrying out motion estimation of the multi-frame under-sampled degraded image sequences to obtain relative motion information among the multi-frame under-sampled degraded image sequences; according to the image degradation model and the relative motion information, carrying out super-resolution reconstruction of the multi-frame under-sampled degraded image sequences by using a maximum a posteriori probability (MAP) method to obtain a super-resolution reconstructed image; and for the super-resolution reconstructed image, recovering the image using a Lucy-Richardson (RL) filter deconvolution recovery method to obtain the recovered image. The method can recover a high resolution image and keep the image edge and image detail information.

If the capacitance of a snubber capacitor, the inductance of a coil and the magnitude of a resistor are specified such that the resonance frequency of the snubber circuit coincides with the ringing frequency of the transistor, and the impedance of the first loop at the resonance frequency becomes smaller than the impedance of the second loop at the resonance frequency, a current component due to ringing flows in the snubber circuit, and energy is consumed by the resistor. Therefore, it is possible to quickly converge ringing.

The invention discloses a power supply conversion device used for receiving input voltage, converting the input voltage and generating output voltage. The power supply conversion device comprises a switching type voltage conversion circuit and an electric potential regulation circuit, wherein the switching type voltage conversion circuit comprises an inductor, a switching switch and a synchronous rectifier, and the switching switch is used for switching off / switching on an energy storage action carried out in the inductor. The synchronous rectifier generates output voltage by way of electric energy stored in the energy storage action. Furthermore, the electric potential regulation circuit is bridged on the switching switch and used for lowering a voltage difference on both ends of the switching switch.

The invention discloses a discharge circuit, a discharge chip and a nuclear magnetic resonance logging instrument. A second output end of a first output winding at the secondary side of an isolation transformer is connected with the drain electrode of a JFET, and is connected with the source electrodes of first and second MOSFETs through a first capacitor. A first output end of a second output winding is connected with the second output end of the first output winding. A second output end of the second output winding is connected with the grid electrode of the JFET and the source electrode of a third MOSFET, and is connected with the drain electrode of the JFET through a second capacitor. A first output end of a third output winding is connected with the source electrode of the third MOSFET, and the grid electrode of the JFET. A second output end of the third output winding is connected with the grid electrode of the third MOSFET. The drain electrode of the third MOSFET is connected with the drain electrode of the JFET. The drain electrode of the first MOSFET is connected with an antenna. The scheme can effectively suppress ringing and dead time of an instrument probe under a high-temperature environment, thereby ensuring higher instrument resolution and signal-to-noise ratio.

The invention discloses an ultra-wideband antenna and an ultra-wideband communication device. The ultra-wideband antenna comprises a dielectric substrate, a coaxial feeder line, two radiation patchesand a plurality of lumped resistors, wherein a through hole is formed in the geometric center of the dielectric substrate; the two radiation patches are in central symmetry with the through hole as the symmetry center, no electrical connection exists between the two radiation patches, and the radiation patches are provided with notches inwards from the edge. The lumped resistors is are loaded at the tail end of the radiation patches; and the coaxial feeder line is electrically connected with the two radiation patches through the through holes respectively. The ultra-wideband antenna provided by the invention adopts a bow-tie-shaped structure and has a stable phase center, and; in addition, the lumped resistors is are loaded at the tail end of the radiation patches with the notch, es so that the ringing phenomenon at the tail end of a the time domain signal can be effectively inhibited, the time domain performance of the antenna can be further improved, and the ultra-wideband antenna also conforms to the antenna design trend of compact and miniaturized structure.

A semiconductor device 100 comprising: gate electrodes 126 arranged inside trenches 122 and facing p-type base regions 116, via gate insulating films 124, in a side wall section; shield electrodes 130 arranged inside the trenches 122 and positioned between the gate electrodes 126 and the bottom of the trenches 122; electrical insulation regions 128 inside the trenches 122, spreading between the gate electrodes 126 and the shield electrodes 130 and spreading along the side wall and bottom of the trenches 122 and isolating the shield electrodes 130 from the side walls and bottom; and a source electrode 134 electrically connected to n+ source regions 118 and the shield electrodes 130. The shield electrodes 130 have a high-resistance region 130a positioned on an n+ drain region 112 side and a low-resistance region 130 positioned on the gate electrode 126 side. As a result, ringing and surge voltage can be suppressed, malfunctions can be suppressed, and increase in switching loss can be prevented.

The invention provides an active rectifier which is applicable to a wireless charging system. The active rectifier is connected with first to fourth switching elements in a bridging mode, and each switching element is connected with a comparator and a reference voltage switching device. According to each of the reference voltage switching devices, the time for each switching element to operate based on its own parasitic capacitance is eliminated, so that the conversion efficiency of the active rectifier can be improved. Therefore, the high-efficiency active rectifier provided can stably work in the wireless charging system with a wide input current range, and can be applied to a system requiring high efficiency.

The invention discloses a switching power supply, which comprises an inductor and a master switch, wherein the master switch is controlled to turn on and turn off, so that the output end of the switching power supply outputs output voltage; the switching power supply further comprises a first branch, a detection module and a logic module, wherein the first branch is connected to the inductor in parallel and comprises a first switch and a ringing suppression resistor which are connected in series, and a connection node of the inductor and the master switch is marked as a switching node; the detection module is suitable for detecting whether associated voltage is smaller than threshold voltage, the output end outputs a detection result, and the associated voltage is associated with the voltage of the switching node; the first input end of the logic module is coupled to the output end of the detection module and the second input end of the logic module is coupled to the control end of the master switch; when the master switch is controlled to turn off and the detection result indicates that the associated voltage is smaller than the threshold voltage, the logic module controls the first switch to turn on until the master switch is controlled to turn on, otherwise the logic module controls the first switch to turn off. According to the scheme of the invention, the ringing can be suppressed, the cost is high and the stability is high.

The invention discloses an RC absorption circuit capable of improving EMC performance. The RC absorption circuit comprises a power supply Vi and a field effect transistor Q1, the positive electrode ofthe power supply Vi is electrically connected with the drain electrode of the field effect transistor Q1, and the source electrode of the field effect transistor Q1 is electrically connected with thenegative electrode of the power supply Vi orderly via an inductor Lp1, an inductor Lp3, a diode D1, an inductor LP4 and an inductor Lp5. The two ends of the diode D1 are connected with capacitors CDin parallel, and the common connection end of the inductor Lp1 and the common connection end of the inductor Lp3 are electrically connected with the common connection end of the inductor Lp4 and the common connection end of the inductor Lp5 orderly via a capacitor Csnub and a resistor R. According to the RC absorption circuit capable of improving the EMC performance, the RC absorption circuit is placed on an energy switch switching point or in a ringing loop, the RC absorption circuit can change the ringing frequency, meanwhile, the capacitance effect of the RC absorption circuit can reduce dV / dt of a switch node, and therefore EMI is effectively restrained.

The invention provides a switching power supply. The switching power supply includes an inductor and a main switch which is controlled for conduction or turn-off so as to enable the switching power supply to output the output voltage. The switching power supply also includes a first branch circuit which is in parallel connection with the inductor, a detection module, and a logic module, wherein the first branch circuit includes a first switch and a ringing inhibition resistor which are connected in series; the connection node between the inductor and the main switch is marked as a switching node; an input terminal of the detection module is directly or indirectly coupled with the switching node, and the detection module is suitable for detecting whether the reduction amplitude of the voltage of the switching node in the preset time exceeds the threshold-voltage, and an output terminal of the detection module outputs the detection result; and a first input terminal of the logic module is coupled with the output terminal of the detection module, and a second input terminal of the logic module is coupled with a control terminal of the main switch, so that when the main switch is controlled to be turned off and the detection result indicates that the reduction amplitude of the voltage of the switching node in the preset time exceeds the threshold-voltage, the logic module controls the first switch to be conducted until the main switch is controlled to be conducted, or the logic module controls the first switch to be turned off. The switching power supply can inhibit ringing, and is low in cost and high in stability.

The invention discloses a driving protection circuit, the driving protection circuit comprises at least two driving protection modules which are electrically connected, each driving protection module comprises a driving module, a pull-down resistor, an inverting circuit, a first switch tube and a second switch tube, a first output end of the driving module is connected with a first end of the second switch tube, a first output end of the driving module is connected with a first end of the first switch tube through the phase inverting circuit, a second output end of the driving module is connected with a third end of the first switch tube, and a second end of the first switch tube is connected with a first end of the second switch tube. The pull-down resistor is connected with the first switch tube in parallel, and the second end of the second switch tube is connected with the third end of the second switch tube in the adjacent previous driving protection module. According to the driving protection circuit, ringing, EMI and EMC can be effectively suppressed, and tube explosion caused by driving crosstalk and mistaken opening of a switching tube is avoided.

A Controller Area Network, CAN, device, (400) is described that includes: a CAN transmitter (430) connected to two CAN bus terminals (401, 402) of the CAN device (400); a receiver circuit (450) operably coupled to the two CAN bus terminals (401, 402) of the CAN device (400); and a controller (432) connected to the CAN transmitter (430). The controller (432) is configured to: determine whether the CAN device (400) is operating as a transmitter node or a receiver node; detect a transition of the CAN device (400) from a dominant state to a recessive state; and in response to detecting both a transition of the CAN device (400) from the dominant state to the recessive state, and the determination of whether the CAN device (400) is operating as a transmitter node or a receiver node, control an output impedance of the CAN transmitter (430) to be within an impedance value range whilst a differential driver voltage on a CAN bus (104, 304, 404) connected to the CAN device (400) decreases to a predefined voltage.

The invention discloses a field effect transistor (GaN HFET) which is provided with: a gate electrode (13); a gate electrode pad (16); a first wiring (22) that connects one end of the gate electrode (13) to the gate electrode pad (16); a second wiring (23) that connects the other end of the gate electrode (13) to the gate electrode pad (16); and a resistor element (17) that is connected to the first wiring (22) and can adjust the impedance of the first wiring (22).

A data transmission system is provided in which it is possible to perform both of suppressing the degrading of the slew rate and suppressing the ringing even if load capacitance of an input buffer is changed.The data transmission system transmitting data from an output buffer to the input buffer through a trace is provided with first RC parallel circuits connected in series to the trace on a first Printed Circuit Board (PCB) on which the output buffer is mounted, and second RC parallel circuits connected in series to the trace on a second Printed Circuit Board (PCB) on which the input buffer is mounted, and which can be connected and separated to and from the first Printed Circuit Board (PCB).

An actuator includes a beam that supports an object to be driven, and a driving source that receives a driving signal and causes the object to rotate around a predetermined axis. The driving signal includes a sawtooth driving waveform, and a differential waveform of a falling section of the sawtooth driving waveform is formed of half sign waves having a wavelength that is a non-integral multiple of a ringing wavelength.

The invention discloses an image blind deblurring method based on the prior information of an external image block and sparse representation, and specifically relates to the external prior estimation of an image block and the application of the external prior estimation into an image deblurring frame. The method comprises the steps: carrying out the training of an image in a clear image library, obtaining a Gaussian mixed model, describing the external prior knowledge of a fuzzy image block through image block expectation logarithmic likelihood estimation, enabling the external prior knowledge to serve as a regular term and to be added to the deblurring frame based on the sparsity, carrying out the iterative restoration of a central image and the solving of a fuzzy kernel in the frame based on the sparse deblurring; constructing a dictionary of a single central image block through a single Gaussian covariance matrix of each type, obtaining a sparsity coefficient through the dictionary, and constructing a central clear image; solving the fuzzy kernel through an augmented Lagrange algorithm; finally solving a final clear image through a hyper-Laplacian algorithm in non-blind deconvolution. An experiment result indicates that the method is better in effect of ringing inhibition and noise weakening.

The invention discloses an impulse type through-wall radar antenna ringing suppression method based on deconvolution, and the method comprises the steps: S1, obtaining an antenna impulse response function, converting the antenna impulse response function into a frequency domain form, and pre-storing the frequency domain form in a radar processor; S2, if the radar is a multi-channel radar, performing channel correction on each channel error in the echo, or if the radar is a single-channel radar, mitting the step; S3, converting an echo FFT after channel correction into a frequency domain; S4, multiplying the echo signal in the frequency domain by the inverse function of the antenna impulse response function to realize deconvolution ringing suppression; S5, converting the signal into a timedomain, wherein the ringing effect in the signal is eliminated. The method has the advantages that the application range is wide, the antenna end signal ringing suppression can be realized, the radarrange resolution is improved, and the like.

The invention discloses a switch ringing suppression circuit based on a gate driver and a control method thereof, and belongs to the field of power electronic devices and control. The circuit comprises a driving circuit, an ADC sampling circuit and a main control unit, wherein the driving circuit comprises a programmable digital voltage source and a current expanding circuit, and the main controlunit comprises a data detector, a driving waveform generator and a power switch controller. A driving waveform generator in the main control unit outputs signals and transmits the signals to the programmable digital voltage source, the power switch controller outputs signals and transmits the signals to the current expanding circuit, and the data detector receives and processes the data sent by the sampling circuit. The sampling circuit measures the current flowing through the measured power switch tube and is connected with the collector / drain of the measured power switch tube. According to the invention, the ringing phenomenon of the power switch tube is suppressed by adjusting the driving waveform, and for different types of power switch tubes or different load conditions, the voltage value of ringing suppression only needs to be adjusted through a program. The ringing phenomenon is suppressed without changing the structure of the converter, and the reliability of the converter is improved.