34 results about "Active feedback" patented technology

The invention belongs to the technical field of hypersonic flight vehicle control, and relates to a rigid-elastic coupling-oriented active and passive integrated control method for a hypersonic flight vehicle. The invention aims to realize stable tracking control of the elastic hypersonic flight vehicle. The method comprises the following steps: constructing a longitudinal dynamic model of the elastic hypersonic aircraft; self-adaptive identification of the elastic vibration frequency is realized through a cascaded self-adaptive filter; an elastic modal filtering estimation method is designed, and high-precision and low-cost elastic modal state quantity is provided for subsequent active feedback controller design; and then rigid-elastic coupling model decomposition is carried out, the control performance is ensured by using active disturbance rejection passive control for a rigid body subsystem, an RBF neural network is introduced for an elastic subsystem, an elastic mode is actively inhibited by using sliding mode control, and stable tracking of a reference instruction is realized. The method is an active and passive integrated control method for the hypersonic flight vehicle oriented to rigid-elastic coupling, and the application prospect is wide.

The invention provides a shank alternating type stretching massage frame and a control system thereof, belongs to the technical field of leg massage equipment, and solves the technical problems that an existing massage frame is single in function, large in transmission gap, obvious in shaking, difficult to give consideration to functionality and safety and the like. Comprising a backrest assembly and a controller, an adjusting assembly is arranged on the front side portion of the backrest assembly, a tendon stretching assembly is arranged at the front end of the adjusting assembly, a foot massage assembly is arranged at the front end of the tendon stretching assembly, the adjusting assembly, the tendon stretching assembly and the foot massage assembly are all electrically connected with the controller, and the backrest assembly, the adjusting assembly, the tendon stretching assembly and the foot massage assembly are all wrapped with outer covering layers. The system comprises a control module, an execution mechanism, an information acquisition module and an active feedback module. The recliner is adopted to guarantee stable operation, double functions of stretching and foot massage are achieved, the adjustable backrest is used for meeting the low-load requirement of people suffering from lumbar disc herniation, a closed-loop control system guarantees that parameters are accurate and controllable, and the use comfort and safety are both considered.

The invention discloses a VSG control method based on frequency deviation feedforward-feedback composite control, and belongs to the technical field of power system control, after a power coupling model based on VSG control is established, reactive power feedforward control GDQ (s) based on frequency deviation is introduced, and enough transient damping support is provided for a system; meanwhile, active feedback control GDP (s) based on frequency deviation is introduced, the active steady-state deviation of the VSG system after GDP (s) active power compensation is introduced is calculated, parameter design is carried out on feedforward-feedback control based on frequency deviation, transient damping support is achieved, and meanwhile the active steady-state deviation caused by fixed virtual damping in VSG control under power grid frequency disturbance is eliminated. The control parameter design is simple, and the stability of the virtual synchronous generator grid-connected system is improved.

The utility model relates to the technical field of radio frequency and microwave, in particular to a linearization circuit of a power amplifier, which comprises the power amplifier used for amplifying an input signal and providing required output power; the bias circuit is used for providing bias voltage for the power amplifier and controlling the change characteristic of a quiescent operating point of the power amplifier along with the temperature and the power; the active feedback circuit comprises a first connection point P1, a second connection point P2 and a third connection point P3, the active feedback circuit effectively reduces nonlinear distortion of the power amplifier through a negative feedback mechanism, and the nonlinear distortion of the power amplifier is effectively reduced by adjusting a first resistor R5, a second resistor R4, a third resistor R1 and a fourth resistor R3. The feedback circuit can be controlled to work in a critical region of a saturation region and a linear region, so that the linearity of the power amplifier can be optimized.

Disclosed are systems and techniques to improve coherence of qubits experiencing fluctuating electric potential caused by the environment. In some implementations, a processing device implementing the disclosed techniques includes a first (second) qubit structure formed using a first (second) set of electrodes electrostatically confining a first (second) electron in a direction lateral to a film, the film including a condensed phase of one or more inert gas elements. The processing device further includes a feedback circuitry to subject the first qubit structure to a probe signal, receive a response signal caused by an interaction of the probe signal with the first qubit structure, generate, using the response signal, a correction signal, and subject the first qubit structure and the second qubit structure to the correction signal.

The application discloses a kind of robot interaction method, device, equipment and medium.Therein, the method includes: by detecting input interaction operation information generated by acting on robot input component;According to the input interaction operation information and robot state information, determine the feedback interaction operation information to be used by robot;According to the feedback interaction operation information, control robot feedback component to execute active feedback interaction action.This technical solution solves the problem that people's emotions cannot be intuitively conveyed to the machine through touch point press and other interaction methods, resulting in an unnatural and smooth interaction process, and achieves the beneficial effects of information input and emotional release of the human side in the interaction process through natural and direct operations such as pinching, pressing, rubbing, rubbing, patting and poking.

An active feedback RF resonator has a signal loop having a signal input and a signal output. The signal loop has a variable gain stage and at least one variable resonator, each variable resonator comprising an inductance element and a variable capacitance element comprising a number of switched fixed value capacitors and a variable capacitor. A phase noise of the active feedback RF signal has a maximum value for an operating frequency of the variable resonator that is based on an operating range of the variable capacitor.

The application discloses a communication flow control method, device and equipment and a storage medium, and relates to the technical field of communication flow control, and specifically discloses the following technical scheme: a step sequence corresponding to a to-be-executed communication flow and a conditional transfer rule are acquired; a target primitive instance matched with a current flow step is acquired from a preset primitive pool, and the target primitive instance is activated; the target primitive instance is driven to execute an asynchronous communication operation, and a step execution result and a condition identifier fed back by the target primitive instance are received; a target step is determined from the step sequence according to the step execution result, the condition identifier and the conditional transfer rule, and the current flow step is updated to the target step. According to the application, the step sequence corresponding to the to-be-executed communication flow and the conditional transfer rule are acquired, and the asynchronous operation and the active feedback execution result are encapsulated by using the primitive instance. Compared with the prior art, the application reduces the state management complexity, eliminates the logic fragmentation, and thus improves the development and maintenance efficiency of the embedded communication flow.

This invention proposes a high-gain, high-linearity amplifier circuit, mainly comprising an input circuit and an output circuit. The input circuit has high gain, converting the received input voltage into current and amplifying it. The input circuit transmits the amplified current to the output circuit. The output circuit generates an output voltage and reduces the input impedance of the input circuit through its included feedback loop. The feedback loop in the output circuit also stabilizes the gain of the entire circuit system and optimizes the system linearity. This invention significantly improves the system gain through the amplifier circuit structure and the back-gate coupled circuit structure, and optimizes the system linearity by setting passive and active feedback loops. This invention achieves both high gain and high linearity.

The invention discloses a test feedback method, and relates to the technical field of test feedback, and the method comprises the steps: determining a corresponding first test task and a first test server after a first voice instruction is received, sending a first test instruction carrying a test script to the first test server, and enabling the first test server to execute the first test task, monitoring the execution state of the first test task in real time, determining a first feedback strategy according to a target exception type when the target exception type is detected, and sending the corresponding feedback content to a specified first feedback device; according to the method, by establishing an automatic feedback mechanism of voice instruction triggering, state monitoring, anomaly classification, strategy matching and active feedback, the technical problem that in the prior art, due to the fact that a test result is manually inquired, anomaly information cannot reach a tester in time, and anomaly processing is delayed is solved; the technical effect of improving the abnormal response speed and the test feedback efficiency is achieved.

The invention discloses a filter network based on external active group delay regulation and control equalization, which comprises a fourth-order microstrip split ring resonator filter network to be subjected to phase calibration, a 3dB bridge, two single-port reflection type split ring resonators and two active feedback amplification loops, the output end of the fourth-order microstrip split-ring resonator filter network is coupled with one port of the 3dB bridge, ports of the two single-port reflection-type split-ring resonators are connected with the other two ports of the 3dB bridge respectively, and the last port of the 3dB bridge serves as a microstrip output port. The two active feedback amplification loops and the two single-port reflection type split ring resonators are in one-to-one correspondence and weak coupling. According to the method, the working characteristics of the single-port reflection type split ring resonator are utilized, the group delay characteristic of the resonator acts on the to-be-calibrated filter network when the resonator resonates, the group delay characteristic of the resonator is superposed with the group delay characteristic of the to-be-calibrated filter network, and then the linear phase filter network with flat group delay is obtained; and meanwhile, an active feedback amplification loop is utilized, a reflected signal acts on the filter circuit through a single-ended split-ring resonator and a 3dB bridge, and the loss of the to-be-calibrated and regulated filter network is compensated, so that the overall transmission performance of the filter network is improved.

The present disclosure relates to an adjustable mechanical motion range limitation apparatus being configured for arrangement between a pair of linkage members of a haptic device and comprising a mechanical motion limitation device being moveable, independently from the active feedback device, in relation to the first linkage members, and having, in relation to the first linkage member, a lock position in which the first mechanical motion limitation device limits, by mechanical contact, an available motion range between the first linkage member and the second linkage member.

The invention relates to the technical field of joint rehabilitation, in particular to a joint rehabilitation bicycle and a joint rehabilitation method.The joint rehabilitation bicycle comprises a frame; a handlebar; a stool; two groups of crank assemblies; a touch screen; the power device and the active feedback system are arranged on the frame, the control system comprises a data acquisition system, a cloud platform and a controller, and the touch screen, the power device, the active feedback system, the data acquisition system, the cloud platform, the crank assembly and the seat are in communication connection with the controller. In the training process of a patient, the patient can collect and mark pain data of the patient through the active feedback system and gradually adjust parameters of the power device and setting parameters of the bicycle, the progressive principle can be followed, the operation difficulty of the bicycle and dependence on medical staff are reduced, and the patient can bear pain but achieve a high rehabilitation effect.

An active filter device is provided that solves the problems of the so-called Π-noise filter and can achieve good noise suppression from the low-frequency range to the high-frequency range. An active filter device 1 comprises a common-mode choke 28 inserted into a pair of power supply lines 11, 12, Y-capacitors 61, 62 of the front stage of the common-mode choke 28, an active feedback compensation voltage output circuit 23 comprising a detection unit 29 that detects the common-mode voltage, and an inverting amplification circuit 37 that inverts and amplifies the common-mode voltage detected at the detection unit, and Y-capacitors 21, 22 of the rear stage between the output of the inverting amplification circuit and the common-mode choke, wherein the output voltage of the inverting amplification circuit is applied to the Y-capacitors of the rear stage as a compensation voltage.

A deflectable catheter assembly including a handle, a catheter system, a method for determine deflection of a deflectable shaft section of the catheter. The catheter includes a handle coupled for deflecting the deflectable shaft section, and one or more pull wires to effect a deflection. The handle includes a housing, a deflection control coupled to the housing and operable to deflect the deflectable shaft section, and a deflection feedback assembly (e.g., a variable resistor) disposed within the housing. The deflection feedback assembly is coupled to the deflection control and configured to convert motion of the deflection control into a signal indicative of a degree of deflection of the deflectable shaft section. The deflection feedback assembly provides an active feedback regarding deflection of the deflectable shaft section to facilitate accurate positioning of the deflectable shaft section within a patient.

The application provides an active feedback-based interference scattering tracking imaging device and method, relates to the optical technology field, and aims to realize real-time tracking imaging of a target object without labeling. In the tracking imaging device, a laser generates laser light, a laser focus modulator controls laser scanning to form a laser scanning area; a displacement table is configured to drive the target object to scan in the laser scanning area, so that the target object generates a scattering signal; the scattering signal interferes with reflected light of the laser to generate an interference scattering signal; a photodetector is configured to convert the interference scattering signal into a detection electric signal; and a controller is configured to obtain a real-time motion position of the target object according to the detection electric signal and a scanning position of the laser.

The present invention provides a method and apparatus for generating RF signals. [Solution] A method and apparatus for generating an RF signal uses digital signal components to generate a composite RF signal having multiple frequency components. An analog filter is used to filter the composite RF signal. The analog filter is an adjustable active feedback circuit having one or more variable resonators and a variable gain block connected to a signal loop defined by a passband. The analog filter is adjusted so that the passband of the analog filter overlaps with one or more desired frequency components of the multiple frequency components of the composite RF signal, and the passband has a relative bandwidth of about 1% or less.

The present disclosure relates to an active-feedback, speed-adjustable, low-power voltage regulator for a high-voltage energy harvester. According to one aspect of the present invention, the voltage regulator comprises: a comparator for comparing, to the reference voltage, a feedback voltage generated by stepping down the output voltage of the voltage regulator by a predetermined ratio; and a feedback circuit that outputs, according to the comparison result of the comparator, a feedback signal for adjusting the output voltage to a target voltage, wherein the comparator dynamically adjusts the comparison speed according to a voltage difference between the feedback voltage and the reference voltage and the feedback circuit adjusts the reference voltage according to the voltage difference.

In order to solve the problem of a so-called n-type noise filter and to obtain a good noise reduction effect from a low-frequency region to a high-frequency region, an active filter device (1) is provided with: a common mode choke (28) inserted into a pair of power supply lines (11, 12); y capacitors (61, 62) of the preceding stage of the common mode choke (28); an active feedback compensation voltage output circuit (23) having a detection unit (29) for detecting the common mode voltage and a reverse amplification circuit (37) for reversely amplifying the common mode voltage detected by the detection unit; and Y capacitors (21, 22) which are arranged at the output of the reverse amplification circuit and the rear stage of the common mode choke. The output voltage of the reverse amplification circuit is applied to the Y capacitors at the rear stage as a compensation voltage.

An amplifier circuit is provided. The amplifier circuit includes a first transimpedance amplifier and a first transconductance amplifier. The first transimpedance amplifier is to receive a first input signal. A first input of the first transconductance amplifier is coupled to a first output of the first transimpedance amplifier. The first transconductance amplifier includes a first passive feedback structure and a first active feedback structure. The first passive feedback structure includes a first resistor coupled between the first output of the first transimpedance amplifier and the first input of the first transimpedance amplifier. The first active feedback structure includes a first inverter having an output coupled to the first input of the first transimpedance amplifier. This configuration optimizes the gain-bandwidth product and stability of the amplifier circuit.

A front-end circuit for an optical counting component is provided. The front-end circuit includes: a signal amplifier configured to operate in a first phase (offset compensation) and a second phase (output phase); a feedback capacitor coupled in parallel to the signal amplifier; and an active feedback circuit comprising an auto-zero (AZ) active feedback amplifier configured to be coupled in parallel to the feedback capacitor in the second phase and isolated from the feedback capacitor in the first phase. The active feedback amplifier is configured to operate in an output phase corresponding to the second phase and an auto-zeroing (AZ) phase corresponding to at least a portion of the first phase. The active feedback circuit is configured to automatically zero the active feedback amplifier in the AZ phase.

The application provides a laser frequency stabilization device based on active feedback control, comprising: a local laser configured to generate and output a laser signal; an optical phase modulator configured to modulate a microwave signal onto the laser signal to obtain a modulated optical signal; an optical filter configured to perform a notch filtering on the modulated optical signal; a photodetector configured to perform beat frequency on the notch filtered optical signal to obtain a first radio frequency signal; a radio frequency amplifier configured to amplify the first radio frequency signal to obtain a second radio frequency signal; a radio frequency power divider configured to divide the second radio frequency signal into two third radio frequency signals with equal power, and input one of the third radio frequency signals into the optical phase modulator; a feedback control loop configured to mix a radio frequency reference signal with the other third radio frequency signal input into the radio frequency power divider to generate an error signal, and generate a feedback signal based on the error signal to adjust the frequency of the laser signal output by the local laser.

The application discloses a kind of distributed energy systems and control method, system includes: converter and controller;The input end of converter is used to connect renewable energy, renewable energy is photovoltaic component and / or fan;Converter has droop characteristic or virtual synchronous machine characteristic;Controller is used to detect the electrical parameter of converter, electrical parameter includes voltage, power or frequency;According to the comparison result of electrical parameter and preset value and load priority, the switching of load is controlled.For better match the relationship between load and power supply, without the active feedback of the state of load, the application detects the electrical parameter of converter, controller compares the electrical parameter of converter with preset value, according to the comparison result and load priority, to automatically control the switching of load in distributed energy system.Balance the relationship between power supply and load, so that power reaches balance, and can guarantee that priority high load is powered on priority, guarantee priority high load normal operation.

The invention discloses a gas-water separation active feedback control module of a dental chair and a feedback control method, and relates to the technical field of dental chairs, the gas-water separation active feedback control module comprises a gas path and water path sub-module, an isolation module, a differential pressure feedback control module, a terminal feedback unit and a central control unit; the gas path sub-module and the water path sub-module are respectively and sequentially provided with an inlet, a proportional valve, a pressure sensor, a flow sensor and a one-way valve along respective fluid paths, and are independently isolated by an isolation module with a neutral isolation layer; the differential pressure feedback control module collects air pressure and water pressure in real time and calculates differential pressure, the differential pressure is compared with a preset threshold value, and the opening degree of the proportional valve is automatically adjusted to maintain balance. The terminal feedback unit is used for detecting return voltage and feeding back a control signal; the central control unit executes closed-loop adjustment based on real-time data, and gas-water proportion self-adaption and dynamic stable output are achieved; complete isolation and differential pressure active compensation control of a gas-water system are achieved, and the water-gas injection stability, safety and intelligent level of the dental chair are improved.

An apparatus for one or more of measuring cognitive state of a user and inducing a change of cognitive state of a user is disclosed. The apparatus is configured to: receive a response signal indicative of an active user response provided in response to a stimulus provided by a stimulus means; determine a control signal in dependence on a characteristic of the response signal and in accordance with a dynamic stimuli pattern, wherein the dynamic stimuli pattern is indicative of possible stimuli to be provided in response to the active user response; and provide the control signal to the stimulus means to control the stimulus means to provide a further stimulus in accordance with the control signal.

The utility model relates to the technical field of flexible clamps, in particular to a universal clamp of a robot arm, which comprises a base, a clamping jaw is fixedly mounted at the bottom of the base, a piezoresistive sensor is mounted on the inner side of the clamping jaw in an embedded manner, and a camera is mounted at the bottom of the base in an embedded manner; the shape memory alloy wires are embedded in the inner cavity of the non-Newtonian fluid to form the clamping jaws, the non-Newtonian fluid has good flexibility, the shape memory alloy wires can deform after being electrified and heated, and the four clamping jaws can draw close to the inside to clamp articles by controlling collision of the shape memory alloy wires. Precise clamping can be achieved through cooperation of the visual recognition technology of the camera and the clamping jaw, the pressure borne by the inner side of the clamping jaw can be monitored in real time through cooperation of the piezoresistive sensor, and therefore the clamping jaw can stably clamp special-shaped or soft objects; the problem that a mechanical telescopic rigid structure clamp is not enough in adaptability to active feedback and workpieces is solved.

The present invention relates to the technical field of industrial gas analysis, and specifically discloses an infrared light-based industrial gas concentration analysis system, which is used to solve the problems of low wavelength drift control accuracy, poor disturbance adaptability, insufficient multi-gas regulation compatibility, and lack of an active feedback mechanism in existing industrial gas detection. The system includes an environmental parameter acquisition module and an infrared light gas analysis and control module, which collect temperature, humidity, and pressure disturbance information in real time and perform standardized processing. The system constructs human-machine collaborative embedding features by combining the physical characteristics of the three gases CO, N2O, and H2O, the state characteristics of the heating furnace, and the behavior characteristics of the laser control. The system realizes disturbance scenario modeling and adjustment strategy prediction through word vector and knowledge graph embedding fusion representation, thereby improving the accuracy, responsiveness, and system generalization capability of wavelength control, and is suitable for high-reliability wavelength control in multi-gas concentration collaborative detection scenarios.

A voltage tuning active inductor is composed of eight units, i.e. a first transconductance unit (1), a second transconductance unit (2), a third transconductance unit (3), an active feedback resistance unit (4), an active feedback capacitance unit (5), a shunt unit (6), a first DC bias unit (7), and a second DC bias unit (8). The division and cooperation of the eight units can respectively realize the following six kinds of inductance comprehensive performances: in a high-frequency working zone, a large inductance value and a large range of independent adjustment of the inductance value relative to the Q value; in the high-frequency working zone, a high Q value and a large range of independent adjustment of the Q value relative to the inductance value; when a working frequency band is adjusted in a large range, a Q peak value can be kept basically unchanged; when the Q peak value is adjusted in a large range, the working frequency band can be kept basically unchanged; when the working frequency band is adjusted in a large range, an inductance peak value can be kept basically unchanged; and when the inductance peak value is adjusted in a large range, the working frequency band can be kept basically unchanged.

This invention relates to the field of precision displacement control technology, specifically to an electric microscope stage with a limiting structure, comprising a drive motor, a lead screw, a slide, and an overload floating protection component. The overload floating protection component is connected between the lead screw and the slide, and includes a floating sleeve, a threaded seat, and a preload elastic component. The threaded seat is threadedly connected to the lead screw and is axially supported within the floating sleeve by the preload elastic component. During normal operation of the slide, the preload force provided by the preload elastic component ensures the transmission rigidity between the threaded seat and the slide. When the slide collides and is obstructed, the resistance overcomes the preload force, causing the threaded seat to undergo axial displacement, providing physical buffering for the slide. Simultaneously, an inductive switch monitors this relative displacement to immediately cut off the drive power. This invention changes the traditional rigid transmission mode, effectively avoiding damage to the mechanism and external equipment caused by continuous high loads from collisions through physical buffering and active feedback mechanisms, thus improving operational safety.

The present disclosure provides systems and methods for FSO systems using active feedback noise reduction for light transmitted through a variably refractive medium. A telescope receives an inbound beam of light. A detector system includes a routing system, a noise reduction system, and a first detector. The noise reduction system has a splitter, a second detector, a controller, and a modulator. The second detector generates a sampled signal from a first portion of the inbound beam. The controller generates a control signal based on the sampled signal. The modulator attenuates a second portion of the inbound beam based on the control signal before detection by the first detector, thereby reducing variable noise caused by the variably refractive medium.