142 results about "Positive feedback" patented technology

The invention discloses a complex system fault root cause analysis method and system based on a knowledge graph. The root cause analysis method comprises the steps of collecting fault data; the method comprises the following steps: retrieving similar document vectors and knowledge graph data, and fusing heterogeneous knowledge; integrating the generated heterogeneous fusion knowledge and fault data provided by a user into a reasoning text required by the LLM, and generating a report by the LLM through the generated reasoning text; scoring the report, and if the score is lower than a threshold value, triggering to regenerate the report; if the related engineer solves the corresponding fault according to the analysis report, forward feedback is carried out, and the analysis report and fault data are updated to the knowledge system; and if the scheme cannot solve the fault and the fault is solved manually, related engineers input the manually solved scheme into the scheme and update the knowledge system. The efficiency of the whole process is improved.

The invention discloses a DRU-MMC direct-current parallel sending-out system for offshore wind power and a control method, and aims at achieving high-economical-efficiency and high-efficiency electric power sending-out of deep and far sea wind power clusters. The system comprises a first offshore wind power plant based on a network construction type fan, a second offshore wind power plant based on a network following type fan, an offshore MMC converter station and an offshore DRU converter station. The offshore MMC converter station adopts a voltage-frequency control strategy added with active power-voltage amplitude negative feedback control and reactive power-frequency positive feedback control, the land MMC converter station adopts constant direct current voltage control, the first offshore wind power plant fan adopts network construction type control, and the second offshore wind power plant fan adopts network following type control. According to the direct current parallel sending scheme of the DRU and the MMC, the technical advantages of the MMC and the economical efficiency of the DRU are considered, the stability and reliability of the system are improved by adopting the specific control strategy, and the economical efficiency of the offshore wind power sending system is improved.

The invention relates to the field of data security, in particular to a network security intelligent detection method based on big data, and the method comprises the steps: collecting network flow data, a terminal system call sequence and a user operation behavior log, and carrying out the data fusion processing to generate a unified behavior event flow; selecting a key behavior event based on an information entropy threshold value, performing time alignment through a dynamic time warping algorithm, and constructing a behavior gene map containing a communication association gene, an operation sequence gene and a behavior time sequence gene; a dynamic behavior baseline model is established by using unsupervised learning, and gene mutation detection and alarm are realized by calculating the deviation degree of each gene dimension; the detection performance is evaluated based on the false alarm rate, model parameters are optimized through a negative feedback mechanism, and acknowledged attack features are stored in a sharable threat gene feature library through a positive feedback mechanism. According to the method, the detection accuracy is continuously improved through a closed-loop learning mechanism, and a self-adaptive safety protection system with self-optimization capability is constructed.

The invention discloses an AI field control intelligent review management method and system based on a live broadcast room, and belongs to the technical field of live broadcast room intelligent management. Collecting interactive data such as bullet screens, comments, gift reward and attention behaviors in a cross-platform manner through a process automation component, writing the interactive data into a cache layer and a database in a layered manner, and generating a traceable collection log; performing semantic recognition, sentiment analysis and violation detection on the interactive data by utilizing a pre-trained language model, and classifying the interactive data into positive feedback, question consultation and violation content; generating a standardized lethal reply for the positive feedback, calling a large model for question consultation to generate a personalized reply in combination with a knowledge base, and performing risk control filtering before reply pushing; based on priority strategy differentiation response interaction, automatic protection is triggered for illegal content, and field control and review links are interlocked and coordinated; feedback data and historical data are collected, and system parameters are iteratively optimized through reinforcement learning. According to the method, automatic acquisition, intelligent analysis, precise review and cooperative field control of interaction in the live broadcast room are realized, the interaction processing efficiency and the content compliance are greatly improved, continuous iterative optimization can be realized, and the multi-platform and multi-scene live broadcast operation requirements are effectively met.

The application provides a comparator and a decision feedback equalization circuit, comprising a first input circuit, which is used for generating a first differential signal according to an input signal and a first reference signal under the control of a control signal; a first positive feedback circuit, which is used for accelerating the difference between the first differential signal; a second input circuit, which is used for generating a second differential signal according to the input signal and a second reference signal under the control of the control signal; wherein the first reference signal is greater than the second reference signal; a second positive feedback circuit, which is used for accelerating the difference between the second differential signal; and an output circuit, which is connected with the output end of the first input circuit and is used for amplifying and latching the voltage signal of the output end of the first input circuit or the voltage signal of the output end of the second input circuit in a regeneration stage to output a comparison result. The response rate of the comparator in the application is high, the power consumption is small, the working voltage is low and the inter-symbol interference can be eliminated.

The invention discloses a low-mismatch ultra-wideband active balun, which belongs to the technical field of analog integrated circuits and comprises a first-stage amplifier and a second-stage amplifier which are sequentially arranged. The first-stage amplifier adopts a differential structure, and finally conversion from a single-end signal to a constant-amplitude and anti-phase differential signal is achieved. The second-stage amplifier isolates the influence of a rear-stage load on a front stage, and the symmetry of differential signals is ensured. In the second-stage amplifier, a seventh NMOS transistor and a tenth NMOS transistor form positive feedback; by introducing the cross coupling capacitor, the gate-source voltage difference between the eighth NMOS transistor and the ninth NMOS transistor is increased, voltage recovery is formed, compared with a traditional active balun, the second-stage amplifier reduces phase and amplitude mismatch of an output signal through positive feedback, meanwhile, the bandwidth is expanded, and therefore the bandwidth is increased. And the grid source signal amplitude is increased by utilizing source electrode voltage recovery, the equivalent transconductance is enhanced, and the phase and amplitude of the output signal are further stabilized.

The application provides a common-source common-gate amplifier, comprising a signal input module, which is used for generating an input signal according to a power supply voltage; a cross-coupling module, which is electrically connected with the signal input module and is used for forming internal positive feedback according to an output signal; a first biasing module, which is electrically connected with the cross-coupling module; a first branch module, which is electrically connected with the first biasing module; a second biasing module, which is electrically connected with the cross-coupling module; a second branch module, which is electrically connected with the second biasing module; wherein the first biasing module and the second biasing module are used for providing biasing after an input common-mode feedback voltage, the first branch module and the second branch module are used for providing large-swing output biasing, and the first branch module and the second branch module are respectively electrically connected with the signal input module, and the signal input module is further used for outputting branch signals to the first branch module and the second branch module. The application improves the voltage swing, the gain and the bandwidth of the circuit under the single-stage amplifier structure.

This invention relates to the field of integrated circuit technology and discloses a three-stage positive feedback comparator circuit and electronic device based on fast timing. The circuit includes a first-stage positive feedback module, a second-stage triggering and clocking module, a second-stage positive feedback amplification module, and a third-stage positive feedback latching module. By employing a three-stage positive feedback structure, this invention places the corresponding differential signal nodes in the same feedback loop at each stage, significantly enhancing the comparator's amplification rate and metastability suppression capability. Furthermore, by introducing a fast timing control mechanism, the second-stage amplification, clock reset generation, and third-stage latching operations can be executed in parallel, effectively shortening the critical path delay and significantly improving the overall comparison speed. The electronic device includes the aforementioned comparator circuit. This invention effectively solves the bottlenecks of traditional comparators in terms of speed and reliability and is suitable for high-speed, high-precision data conversion systems.

The present disclosure provides a differential hysteresis comparison circuit and method, which comprises: a differential input circuit for inputting a first differential signal and a second differential signal; a positive feedback hysteresis circuit connected with the differential input circuit, for comparing the first differential signal and the second differential signal to obtain a differential comparison result, outputting a first comparison result signal when the differential comparison result is greater than a first threshold voltage, outputting a second comparison signal when the differential comparison result is less than a second threshold voltage, the first threshold voltage being greater than the second threshold voltage; and an output stage circuit connected with the positive feedback hysteresis circuit, for converting the first comparison result signal or the second comparison result signal into a single-ended signal output.

This invention belongs to the field of solid oxide fuel cell control and optimization technology, and particularly to a dual-input model predictive control method for solid oxide fuel cells with carbon deposition constraints. It includes the following steps: S1: Constructing a DIR-SOFC controlled object model with 11 state variables; S2: Solving for the optimal control increment through sequential quadratic programming; S3: Constructing a constraint system; S4: Introducing an adaptive setpoint for the output voltage that adjusts linearly with the load current density. The model dimension of this invention is expanded from the existing 3 states to 11 states, fully covering six gas phase partial pressures, bilinear coupling of carbon accumulation and catalyst activity, and three-zone thermal dynamics. The ODE white-box prediction engine accurately reflects MSR nonlinearity and positive feedback of carbon deposition. Compared with ARMAX black-box prediction, the error is reduced from approximately 3% to less than 0.8%, with an average single-step calculation time of 133ms, meeting the real-time constraint of a 1s sampling time.

The pressure reducing valve heater temperature control circuit comprises a temperature control module, a switch module and an induction module, the induction module is suitable for recognizing the outlet temperature of a pressure reducing valve and correspondingly releasing a positive feedback signal or a negative feedback signal according to the recognized temperature, and the switch module is suitable for controlling the heater to be connected or disconnected with a power source. The temperature control module is suitable for identifying the positive feedback signal and the negative feedback signal so as to respectively drive the switch module to connect and disconnect; through the synergistic effect of the temperature control module, the switch module and the sensing module, automatic opening and closing of the heater can be guaranteed, so that the temperature of the pressure reducing valve is kept within a set range, overheating or supercooling is avoided, and it is guaranteed that the pressure reducing valve works stably.

This invention relates to the field of permanent magnet synchronous motor (PMSM) design technology, and discloses a method and device for integrated collaborative optimization design of the rotor magnetic circuit of a PMSM. The method includes: collecting time-series data of multi-source vibration and electromagnetic load under heavy-load conditions of forklift operation, and constructing a dynamic excitation phase space mesh for the rotor interface; performing multi-field coupled response simulation based on the mesh to drive a parameterized rotor model, generating a structural eddy current coupled simplex complex; constructing a combined constraint and sub-mode gain model for robust magnetic circuit optimization based on the complex, generating a geometrically reinforced candidate solution set; performing multi-objective collaborative convergence and three-dimensional model generation under the constraints of the candidate solution set, and outputting an anti-disturbance optimized rotor structure. This invention solves the problem that existing technologies cannot cope with dynamic multi-field positive feedback under complex forklift operating conditions, leading to decreased efficiency and low reliability of the motor during continuous operation, thus enabling the motor to adapt to forklift operation requirements.

The invention discloses a thrust vector compensation control method suitable for a nonlinear friction load, which adopts a current positive feedback compensation correction network, combines low-pass filtering with proportional gain, takes iq current as input and takes a compensation instruction delta r as output, and is simple, convenient and effective. The problems of amplitude attenuation and phase lag caused by inherent nonlinear load characteristics of the nozzle are solved, and the tracking capability of an electromechanical servo system to a control instruction is improved. The algorithm complexity is low, parameter adjustment is simple and easy to operate, and parameter adjustment time is saved.

This invention belongs to the field of analog integrated circuit design, and particularly relates to a low-dropout linear regulator with fast dynamic response and high stability. It includes: an error amplifier, a Class AB buffer stage circuit, an output power transistor, a positive feedback resistor compensation circuit, an undervoltage detection circuit, and a startup circuit. The Class AB buffer stage circuit is used to improve the transient characteristics of the low-dropout linear regulator, and the positive feedback resistor compensation circuit is used to improve the phase margin of the low-dropout linear regulator. This invention achieves fast dynamic response, essentially eliminates overshoot and undershoot phenomena, and significantly shortens the recovery time. It also maintains high stability while ensuring loop gain and includes undervoltage detection functionality to ensure smooth system startup.

The present disclosure relates to electronic protection systems and controls. A protection IC protects an external load connected to a mains supply line from dangerous or undesirable conditions such as overvoltage, undervoltage, and overcurrent by disconnecting the external load for at least the duration of such conditions. The IC has a range detector, a zero-crossing detector, a control unit, a switch driver, and a dummy DAC. The range detector senses the presence of an unwanted condition. The control unit then waits for a zero-crossing, at which time the load is disconnected. A lock timer can introduce a minimum wait time before reconnecting the load. To prevent instability around the switching point, hysteresis in the window threshold prevents the effects of noise. The dummy DAC regulates a dummy current, which linearizes the IC current consumption around the switching point to prevent instability caused by positive feedback in the non-linear transition.

The application discloses a kind of balanced cutting adaptive control method, system and numerical control lathe, belong to numerical control machine tool technical field, solve double-spindle double-tool turret numerical control lathe in double-tool turret balanced cutting finishing stage, because of cutting fluid impact, servo response difference and temperature gradient cause cutting force-thermal deformation coupling vibration, lead to surface finish deteriorate, while conventional detection cannot be identified, finally cause precision parts batch scrapping problem.It includes the following steps: initialization and reference calibration step, determine the fixed parameters required for algorithm operation and store in numerical control system parameter table.The application is by collecting double-tool turret servo current and decoupling into high-frequency component and low-frequency component, using high-frequency component to adjust feed rate, using low-frequency component to offset radial position, to cut off the positive feedback coupling chain between cutting force fluctuation, chip shape change, cooling liquid jet deflection, temperature field distribution change and cutting depth fluctuation, suppress non-periodic dynamic vibration response, avoid machining surface finish deterioration.

The application discloses a kind of dual-channel limited space signal transmitting system and method, using MENS micro electro mechanical assembly oscillator design to obtain the self-excitation vibration ability of MHz, GHz different frequency by positive feedback conversion to alternating current signal, real-time analysis is carried out to limited space physical signal sine wave conduction condition, intensity simultaneously, so as to have MHz / GHz dual mode, strong anti-interference ability, signal is not easy to superimpose, strong penetration ability and other characteristics, improve the bandwidth of communication signal emission, anti-superposition, filtering and other capabilities, solve the problem that the principle of traditional signal transmitter is simple, mode is single, and anti-interference ability is poor.

This invention discloses a dynamic comparator for a successive approximation analog-to-digital converter (ADC), relating to the field of comparator technology. The dynamic comparator includes: a cascaded pre-amplifier circuit and a latch circuit; the pre-amplifier circuit includes at least a differential input pair of transistors, a positive feedback loop, and a first tail current source; the differential input pair is used to receive external differential input signals; the positive feedback loop and the first tail current source are both connected to the differential input pair; the first tail current source includes three NMOS transistors connected in parallel; the three NMOS transistors connected in parallel are used to dynamically bias the differential input pair; the positive feedback loop is connected between the two signal output nodes of the pre-amplifier circuit; the positive feedback loop is used to increase the gain of the pre-amplifier circuit. This invention addresses the problems of large footprint and difficult offset calibration in existing successive approximation ADCs.

The invention discloses an unmanned surface vehicle path planning method based on an improved cuckoo algorithm. According to the method, a self-adaptive step length updating mechanism combining a pheromone factor and a heuristic factor is introduced in the iteration process of the cuckoo algorithm. The pheromone factor refers to a positive feedback mechanism of an ant colony algorithm to guide search to be carried out towards a historical high-quality solution direction; the heuristic factor dynamically adjusts the step length direction according to the distance between the current optimal solution and the candidate solution, and the local development capability is enhanced; and through a dynamic weight adjustment strategy, self-adaptively balancing global exploration and local search in an iteration process, and performing connectivity optimization on discrete path points output by an algorithm by using a Dijkstra algorithm to obtain a continuous and collision-free sailing path. According to the method, the convergence speed and the solving quality of path planning are remarkably improved, and the autonomous navigation capability of the unmanned surface vehicle in a complex environment is enhanced.

The application relates to the field of integrated circuit design, in particular to a double-tail dynamic comparator based on a feedback structure, which comprises a preamplifier, a latch and a positive feedback structure which are cascaded with each other; the preamplifier comprises input ends VIP and VIN, output ends fn and fp, and is used for amplifying comparison signals of the input ends; the latch is used for carrying out digital judgment on the amplified comparison signals and latching a judgment logic level; and the positive feedback structure is used for providing a discharge path for fn and fp and increasing a differential voltage between fn and fp. The application introduces the design of the positive feedback structure, adds a new discharge path to the output node of the amplifier to accelerate the pre-amplification speed, and increases the differential voltage between the output nodes fn and fp, so as to reduce the regeneration time of the latch, inhibit the influence of non-ideal factors on the comparator when the input differential signal is small, and accelerate the comparison speed.

This invention provides a comparator circuit with latching function and its control method. The comparator circuit with latching function uses an initial voltage provided by a pre-comparison module. The initial voltage is dynamically adjusted based on the input comparison voltage to generate a first current variable. This first current variable is converted into a control voltage, and a first comparison result is output based on the control voltage. The first comparison result is compared and positive feedback latched by the latching module to obtain a second comparison result. This comparator circuit with latching function, designed for low-to-medium precision and low-frequency applications, replaces the redundant design and related bias circuits of multi-stage operational amplifier cascades with a pre-comparison module. The common-mode voltage bias is integrated into the structure of the pre-comparison module, simplifying the circuit structure. This comparator circuit does not interfere with the preceding or following circuits, reducing process sensitivity.

The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.

The invention discloses a hysteresis-adjustable high-speed comparator which comprises a bias module, an input and output tube pair, an adjustable voltage output module, a first equivalent MOS tube MI, a second equivalent MOS tube MII and a load module. The common source node of the input and output tube pair is used for forming series current negative feedback, the grid and drain electrodes of part of MOS tubes in the first equivalent MOS tube MI and the second equivalent MOS tube MII form parallel voltage positive feedback, and the positive feedback coefficient of the parallel voltage positive feedback is set to be larger than the negative feedback coefficient of the series current negative feedback, so that the hysteresis comparison function is achieved. The transconductance of the first equivalent MOS tube MI and the transconductance of the second equivalent MOS tube MII are changed by changing the control voltage output by the adjustable voltage output module, so that the forward turning point and the reverse turning point of the hysteresis adjustable high-speed comparator are changed, the function of adjusting the hysteresis voltage is achieved, and the hysteresis adjustable high-speed comparator can be flexibly adjusted.

The application belongs to the technical field of amplifiers, and relates to a cyclic structure amplifier, in particular to a high-gain transconductance-enhanced cyclic structure amplifier. The cyclic structure amplifier comprises PMOS tubes P1a, P1b, P2a, P2b, P5, P6, P7, P8 and P9, and NMOS tubes N1, N2, N3, N4, N5a, N5b, N6a, N6b, N7a, N7b, N8a and N8b. The drain of the PMOS tube P1b is connected to the gate of the NMOS tube N5b. The drain of the PMOS tube P2b is connected to the gate of the NMOS tube N6b. The NMOS tube N5b and the PMOS tube P1b and the NMOS tube N6b and the PMOS tube P2b form a cross positive feedback path, which can enhance the transconductance of the PMOS tubes P1b and P2b. The high-gain transconductance-enhanced cyclic structure amplifier provided by the application has a transconductance five times that of a conventional folded cascode operational amplifier and a nine-time higher slew rate than that of the folded cascode operational amplifier.

A control device actuates an active haptic operating element for a motor vehicle. The control device is designed to determine whether there is an activation of the operating element; to determine whether the operating element is assigned an available function if an activation of the operating element has been determined; and to actuate the operating element to emit an active haptic positive feedback when an activation of the operating element has been determined, and it has been determined that the operating element is assigned an executable function. The control device is designed to actuate the operating element to emit an active haptic negative feedback when an activation of the operating element has been determined, and it has been determined that no executable function is assigned to the operating element. The active haptic positive feedback and the active haptic negative feedback differ from one another.

The invention discloses an adaptive structure LIF neuron circuit, which comprises a current integration module, a voltage amplification module, a voltage positive feedback module, a voltage reset module and an adaptive module, and is characterized in that the current integration module is composed of an input current source Iin and an integration capacitor C1, and the voltage amplification module is composed of two stages of c-OECT inverters in cascade connection; each level of c-OECT phase inverter is composed of a pair of n-OECT and p-OECT, namely M2-M5, the voltage positive feedback module is composed of a capacitor C2, the voltage positive feedback module and the capacitor C1 jointly form a capacitance voltage division network, the voltage reset module is composed of a transistor M1, and the self-adaption module is composed of a resistor R1, a resistor R2, a resistor R3, a capacitor C3, two n-OECTs and a p-OECT. The learning behavior of biological neurons is simulated, a neuromorphic device capable of simulating neurosynaptic plasticity can be developed, an electronic device conforming to neuromorphic calculation characteristics can be developed, and the method can be applied to neuron calculation, brain-like intelligent systems and large-scale neural network development.

Implementations disclosed and claimed herein provide a wheel cover system. In one implementation, an inward force exerted against a wheel cover of the wheel cover assembly in an inward direction towards the hub is received. The inward force overcomes a spring bias of a spring of the receiver and translates the wheel cover assembly in the inward direction. A first rotational force rotating the wheel cover assembly in a first direction is received. The first post guides and engages the first hook, and the second post guides and engages the second hook during rotation. A first positive feedback is generated in response to the inward force and the first rotational force. The wheel cover assembly is releasably locked to the receiver by translating the wheel cover assembly in the outward direction using an outward force generated by the spring bias. The outward force provides a second positive feedback.

The application provides an electrostatic protection structure and a preparation method and an electrostatic protection circuit. The electrostatic protection structure comprises a substrate, a well region with a second doping type formed on the substrate, a gate structure formed on the surface of the well region, and a drain region and a source region formed in the well region on both sides of the gate structure; the drain region comprises at least a first drift region with a first doping type, a first heavily doped region with the first doping type and a second heavily doped region with the second doping type which are formed in the first drift region; the source region comprises at least a second drift region with the first doping type and a third drift region with the second doping type which are arranged at intervals, a fourth heavily doped region with the first doping type formed on the second drift region, and a fourth heavily doped region with the second doping type formed on the third drift region. By forming a positive feedback loop in the electrostatic protection structure, the large ESD current is discharged.

An object of the system according to the embodiment is to provide support for accumulating daily small successful experiences to a person who has difficulty in taking a step to a new challenge or a social scene.SOLUTION: A system according to an embodiment includes an activity recording unit, a goal suggesting unit, a feedback providing unit, a communication hint providing unit, a relaxation method providing unit, and an advice providing unit. The activity recording unit records daily activities and challenges of the user. The goal suggestion unit suggests a small goal that can be achieved based on the information recorded by the activity recording unit. The feedback providing unit provides positive feedback when the goal proposed by the goal proposing unit is achieved. The communication hint providing unit provides a hint of communication in a social situation. The relaxation method providing unit provides a breathing method for relaxation. The advice providing unit provides practical advice for overcoming a stranger.SELECTED DRAWING: Figure 1

This invention discloses an adjustable frequency microwave oscillator, comprising a feedback resonant network, an active transistor amplifier, and a phase adjustment network. The feedback resonant network includes a resonator. The active transistor amplifier is connected to the feedback resonant network through an input matching network and an output matching network. The phase adjustment network is equivalent to a variable capacitor. The signal passes through the input matching network, the active transistor amplifier, the output matching network, and the feedback resonant network to form a positive feedback oscillation. The phase of the loop is adjusted by regulating the equivalent variable capacitor of the phase adjustment network. The oscillation frequency is adjusted by the phase adjustment network, and the oscillation conditions of the oscillator are improved by a high-Q frequency selection network, enabling precise control of the frequency and power of the microwave oscillator.