53results about How to "Reduce phase delay" patented technology

The invention discloses a speed sensorless optimization method based on fuzzy control and sliding mode observer, which detects the position and rotor speed of the motor rotor through a sliding mode observer which is easy to implement in engineering, and uses a fuzzy controller to replace the traditional PI speed regulator. In the permanent magnet synchronous motor vector control system, due to the obvious delay of the traditional PI regulator and the low self-adaptive ability, the robustness of the fuzzy control is strong, and the influence of disturbance and parameter changes on the control effect is greatly weakened, especially It is suitable for the control of nonlinear, time-varying and pure lag systems. Fuzzy control is designed based on heuristic knowledge and language decision rules, which is conducive to simulating the process and method of manual control and enhancing the adaptability of the control system. It has a certain The level of intelligence is very suitable for those objects whose mathematical models are difficult to obtain, whose dynamic characteristics are difficult to grasp, or whose changes are very significant.

The invention discloses a speed-less sensor control method based on a rotation high-frequency injection method and fuzzy PI (proportional integral) control. In the estimation of a rotor angle and a rotating speed, a high-frequency signal injection method is particularly suitable for a zero speed and a low speed, and meanwhile, a fuzzy controller is adopted to replace a traditional PI speed regulator. In a vector control system of a permanent magnet synchronous motor, because of the factors of obvious time delay, low self-adaptive ability and the like of the traditional PI regulator, and strong robustness of fuzzy control, the influence of interference and parameter variation on the control effect is greatly weakened, and the method is particularly suitable for control of nonlinear, time-variation and pure delay systems; and the fuzzy control is designed based on suggestive knowledge and language decision-making rules, so that the method is favorable for simulating a process and a method for manual control, and enhancing the adaptability of a control system. The control method has a certain intelligent level, and is very suitable for those objects of which mathematical models are difficult to obtain, dynamic characteristics are not easy to grasp, and change is very significant.

The invention discloses a polydomain vertical alignment mode liquid crystal display panel and a manufacturing method thereof. The liquid crystal display panel includes a colorized film basal plate, an array basal plate and liquid crystal molecules. An alignment bulge is formed on the surface of the colorized film basal plate; an alignment bulge or an alignment concave part is formed on the surface of the array basal plate; the liquid crystal molecules are filled between the colorized film basal plate and the array basal plate, wherein the liquid crystal molecules are added with a polymer with the characteristics of light-curing and heat-curing, and the liquid crystal molecules arranged near the alignment bulge are fixed by the polymer with the characteristics of light-curing and heat-curing, and approximately vertical to the basal plates. The polydomain vertical alignment mode liquid crystal display panel and the manufacturing method thereof efficiently solve the problem of light leakage in a dark state, and improve the contrast and the response speed of the liquid crystal display panel.

An optical disc device according to the present invention is provided with, as shown in FIGS. 1 and 2, a high frequency band processing circuit for removing low frequency components of signals outputted from plural photodetectors of a pickup, and generating various kinds of signals required for recording/playback of an optical disc by digital processing after performing AD conversion by a high-speed low-bit AD converter; and a low frequency band processing circuit for removing high frequency components of the signals outputted from the respective photodetectors of the pickup, and generating various kinds of signals required for recording/playback of an optical disc by digital processing after performing AD conversion by a low-speed high-bit time-division AD converter. Thereby, various kinds of signals required for recording/playback of an optical disc can be generated using a single circuit, whereby the product cost, power consumption, and circuit scale can be reduced.

The invention provides a rotation speed estimation method for a permanent magnet synchronous motor (PMSM) based on a novel phase-locked loop. The method comprises the following steps: obtaining back electromotive forces; smoothening a waveform through an extended Kalman filter for optimization, so that optimized back electromotive forces e<alpha> and e<beta> are obtained; and calculating an errorvalue according to the optimized back electromotive forces e<alpha> and e<beta> and inputting the error value into the novel phase-locked loop for speed estimation. The method has the advantages thatmultiple solutions are transformed into a single solution for adaptation to PI control, so that a rotation angle estimation value theta-arrow and a rotation speed omega-arrow can be more accurately calculated; and excellent sensorless control can be achieved, so that a rotation angle and a rotation speed signal can be accurately estimated even in case of a low speed or reversed rotation.

The invention discloses a nerve signal detection/excitation electrode, a twin-electrode, an electrode array and preparation methods thereof. The electrode comprises an acupuncture needle body, an acupuncture needle of which the lower part is a needle tip and the upper part is a needle handle, and an insulating layer is coated on the part above the needle tip and below the needle handle; and epoxy resin and polyimide composite are adopted as the materials. The setting method thereof is as follows: polymerizing 4, 4'-diaminodiphenyl ether and pyromellitic dianhydride in ice bath with the temperature of 0 DEG C to obtain polyamide according to the molar ratio of 1:1; and adding epoxy resin in the polyamide according to the ration that each 20ml of polyamide is added with 1g of epoxy resin, stirring to enable the solution to be uniform and clear so as to obtain the composite solution of the epoxy resin and the polyamide, using a spin coater for spin coating to enable the needle body of the acupuncture to be coated with a layer of epoxy resin and polyamide composite, placing into an oven for baking for 1h at the temperature of 125 DEG C, then baking for 1h at the temperature of 250 DEG C, and forming the epoxy resin and polyamide composite on the needle body serving as the insulating layer.

The invention discloses a speed ring fuzzy control and high-frequency injection method-based sensorless control system, which comprises a PMSM module, a Clark transformation module, a Park transformation module, a rotor parameter estimation module, a high-frequency signal injection module, a first comparator module, a fuzzy controller module, an MTPA module, a second comparator module, a first PI adjusting module, a third comparator module, a second PI adjusting module, a Park inverse transformation module, an SVPWM module and an inverter module. In rotor angle and rotating speed estimation, a high-frequency signal injection method is especially suitable for a zero speed and a low speed, and meanwhile, a traditional PI speed adjuster is replaced with a fuzzy controller. In a permanent magnet synchronous motor vector control system, the robustness of fuzzy control is high, the interference and the influence of a parameter change on the control effect are greatly reduced, the sensorless control system is especially suitable for control on nonlinear, time-varying and pure delay systems, simulation of manual control process and method is facilitated and the adaptive capacity of the control system is strengthened.

The invention discloses a permanent magnet synchronous motor speed-sensor-free speed measuring method based on fuzzy control and an MRAS. The method is used for position and speed detection of a motor. In the actual running process, according to model reference adaptive control, the actual running condition of the motor serves as a reference model, a motor model containing to-be-estimated rotating speed, current and other parameters serves as an adjustable model, an equation not containing unknown parameters serves as a reference model, the two models have the same output quantity in physical significance, the output value of the reference model serves as ideal response, the two selected models both output current values, the adjustable model is adjusted through the difference between actually measured current and estimated current of the motor, the actual value is tracked through the estimated value, the output difference between the two models approaches zero, and therefore the purpose that output of the reference model can be tracked through output of a control object, and then the motor runs stably is achieved.

An imaging coil (12) includes multiple end rings (52). A center ring (53) extends parallel to and is coupled between the end rings (52). Multiple legs (86) are coupled between the end rings (52) and the center ring (53). The end rings (52) may have a first radius (R1) that is greater than a second radius (R2) of the center ring (53). The imaging coil (12) may include more than 16 legs. The imaging coil (12) may include multiple capacitor groupings (98) coupled along the end rings (52), each capacitor grouping (98) has multiple capacitors (102) with a coverage area width (W) greater than 5.0 cm. The center ring (53) may be coupled to a ground reference (110) and has low impedance such that the center ring (53) is effectively shorted to the ground reference (110).

The invention provides a passive-control high-frequency signal-injected permanent magnet synchronous motor positionless sensor control system and a control method and belongs to the motor control field. The system comprises a first coordinate conversion unit, a high frequency response signal separation unit, a PLL speed observer, a soft switch passive rotation speed current regulator, a second coordinate conversion unit and a modulation unit, wherein the first coordinate conversion unit converts a three-phase current of a permanent magnet synchronous motor into a d-axis current and a q-axis current; the high frequency response signal separation unit combines a d-axis current, a q-axis current, and a high-frequency injection voltage signal to generate a high frequency response error signal;the PLL speed observer obtains a motor rotation speed estimation value and a position estimation value; the soft switch passive rotation speed current regulator obtains a d-axis voltage given value and a q-axis voltage given value; the second coordinate conversion unit forms a modulation given voltage; and the modulation unit carries out 3D-SVPWM modulation on a modulation voltage to obtain a duty cycle signal, and the duty cycle signal is sent to a driving circuit to generate a driving waveform. The system and the method have advantages that power density is large; operation reliability is high; and production efficiency is high too.

The invention provides a liquid crystal display panel. The liquid crystal display panel comprises a colorful diaphragm substrate, a thin-film transistor substrate and sealing glue and an elastic buffering structure which are arranged between the colorful diaphragm substrate and and the thin-film transistor substrate; the elastic buffering structure comprises a first elastic member which is fixedlyarranged on the colorful diaphragm substrate and a second elastic member which is fixedly arranged on the thin-film transistor substrate, and the first and second elastic members are clamped after the colorful diaphragm substrate and the thin-film transistor substrate are aligned and assembled. The liquid crystal display panel has the advantages that when the liquid crystal display panel is bent,the dislocation of upper and lower substrates of the edge of the liquid crystal display panel is reduced on one hand due to the clamping of the first and second elastic members and the buffering on stress, on the other hand, part of the stress at the edges of the liquid crystal display panel is stored by the buffering effect of the elastic buffering structure, so that the stress at the edges of the liquid crystal display panel is greatly reduced, phase-position delay at the edge of the liquid crystal display panel is reduced, and the light leakage of the edges is greatly improved.

The invention discloses an audio processing method and device, a computer readable storage medium and electronic equipment. The audio processing method comprises the following steps: acquiring an audio signal; determining a screening condition corresponding to the audio signal, the screening condition being used for screening a preset frequency point in the audio signal; and screening a preset frequency point in the audio signal based on the screening condition and the audio signal. According to the audio processing method provided by the embodiment of the invention, a precondition is providedfor separating audio information corresponding to the preset frequency point from the audio signal in a mode of screening the preset frequency point in the audio signal by utilizing the screening condition. In addition, when the audio information corresponding to the preset frequency point is the noise information, the embodiment of the invention can provide a precondition for timely, fast and highly targeted noise processing.

The invention provides a maximum power tracking method and system based on a Taylor formula and terminal equipment. According to the method, a nonlinear tracking differentiator constructed by the adoption of a saturation function is utilized, and the Taylor formula is utilized to perform optimization processing on phase delay performance of the nonlinear tracking differentiator, so that the contradiction between a filtering effect and a phase delay effect is solved; and then a conductance increment method is utilized to perform maximum power point tracking, wherein a discrete steepest trackingdifferentiator is added on the basis of maximum power point tracking through a traditional conductance increment method, a disturbance signal is subject to filtering processing, and on the basis of adding the discrete steepest tracking differentiator according to the conductance increment method, the Taylor formula is adopted to improve the efficiency and accuracy of maximum power point tracking.

An integrated high speed electro-optical control loop for very high-speed linearization and temperature compensation of an electro-absorption modulator (EAM) for analog optical data center interconnect applications is disclosed. The control loop can function in a stable manner because the electronics and optical components are monolithically integrated on a single substrate in small form factor. Because of the small size enabled by monolithic integration, the temperatures of the optical blocks and electronics blocks are tightly coupled, and the control loop time delays and phase delays are small enough to be stable, even for very high frequency operation. This arrangement enables a low cost, low power analog transmitter implementation for data center optical interconnect applications using advanced modulation schemes, such as PAM-4 and DP-QPSK.

Disclosed is a flexible substrate, which relates to the technical field of display. The flexible substrate includes a first film and a second film arranged from bottom to top in sequence. The second film is arranged to counteract birefringence effect generated by the first film so as to eliminate phase retardation of the flexible substrate. Thus, display effect can be improved, and impacts on a substrate due to increasing of film thickness can also be avoided. Besides, thickness of the flexible substrate can be determined according to actual needs.

An amplifier circuit includes an operational amplifier and a compensation circuit. The operational amplifier includes an amplifying stage for amplifying an input signal to generate an amplifying signal; and an output stage coupled to an output node of the amplifying stage for receiving the amplifying signal and generating an output signal according to the amplifying signal. The compensation circuit is coupled to the output stage and the amplifying stage for generating a compensation signal according to the output signal, and feeding the compensation signal back to the output node of the amplifying stage for compensating the amplifying signal.