51results 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.

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 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 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 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.

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 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.