482 results about "Current mode" patented technology

The invention provides a multi-mode control method and system for a brushless doubly-fed motor, and relates to the technical field of motor control, and the method comprises the steps: extracting torque-rotating speed slopes and dynamic response time constants of two points based on a steady-state working point of a current mode and an expected working point of a target switching mode, and constructing a linear correction function; fusing an output value of the linear correction function with an optimization result to generate a modal transition compensation coefficient, and injecting the compensation coefficient into a rotor side voltage control ring based on a feedforward control channel to generate an anti-disturbance dynamic compensation control strategy; and for a non-smooth adjustment item in the dynamic compensation control strategy, performing smoothing processing on a discontinuous boundary of a control quantity by adopting a subgradient projection algorithm, verifying continuous conductivity of a control curved surface in combination with a Lyapunov stability criterion, and generating a final control instruction. According to the invention, adaptive smooth switching control of the brushless doubly-fed motor can be realized.

The invention relates to the field of locomotive power battery electric quantity control, and particularly discloses a locomotive power battery electric quantity hysteresis equalization control method, which comprises the following steps that: a traction force exerting mode is reset into an axle load transfer mode, and the initial value of an electric quantity equalization compensation coefficient K is a rack axle load transfer coefficient corresponding to zero speed; judging whether the current mode is a power battery power supply mode; if yes, the TCU receives the electric quantity of a front power battery and the electric quantity of a rear power battery in real time according to the current locomotive working mode, calculates the electric quantity average value difference value, monitors the auxiliary load power and the traction motor power and calculates the power difference value; entering a hysteresis control logic process; calculating a dynamic traction force compensation coefficient, ensuring that the traction force compensation amount is matched with the actual load characteristic of the system, correcting the traction characteristic curve in real time, and dynamically compensating the electric quantity difference of the battery; and performing traction distribution control according to the locomotive speed and outputting corresponding traction.

A power converter topology, comprising: a cascade connection of a first converter stage and a second converter stage; wherein the first converter stage comprises a current mode controlled pulse width modulation (PWM) converter having one or more pairs of switches forming a first switching bridge and an inductor connected to the output of the first switching bridge, the switching bridge generating a voltage Vlink; and wherein the second converter stage is a resonant converter having a switching stage having one or more pairs of switches forming a second switching bridge across the voltage Vlink generated by the first converter stage and a resonant tank connected to the output of the second switching bridge, to generate a resonator output voltage; the topology further comprising a transformer to transform the resonator output voltage to a transformed output voltage and a rectifier to rectify the transformed output voltage to an output voltage Vout, and wherein the duty cycle of the first switching bridge is varied according to a voltage derived from the value of the output voltage Vout, and wherein the duty cycle of the second switching bridge is fixed at 50:50.

The invention discloses a short-circuit current limiting and short-circuit recovery transient voltage control device and method for an aviation three-stage power generation system, and the device comprises a three-stage power generator, a power generator controller, a current sensor, a voltage and current collection module, and an asymmetric half-bridge excitation control circuit. Collecting the output current iL and voltage UL of the generator through a digital processor of the generator controller; when short circuit occurs, the given voltage USet of the voltage regulating loop is linearly reduced in a piecewise mode according to the relation between the iL and a preset threshold value, so that the generator works in a constant power interval; and when the short circuit is recovered, closing the upper / lower power tubes of the asymmetric half-bridge excitation control circuit according to the relationship between UL and a preset threshold value in a grading manner, and triggering a negative-pressure follow-current mode of a main excitation winding of the generator controller to quickly extinguish the field. The method can adapt to different generators without adjusting hardware circuit parameters, has no motor ablation risk during short circuit, has transient voltage less than 350V after short circuit recovery, has no power supply interruption in the whole process, has response delay less than 1ms, and greatly improves the safety and robustness of an aviation power supply and distribution system.

The invention discloses a terahertz dual-sheet metasurface antenna unit regulated and controlled by an MEMS switch, and belongs to the field of terahertz wireless communication equipment. The filter comprises two layers of quartz glass dielectric substrates. The lower surface of the lower quartz glass dielectric substrate is provided with a bias circuit, the lower surface of the upper quartz glass dielectric substrate is provided with a metal ground, and the upper surface of the upper quartz glass dielectric substrate is provided with a 1-Bit radiation unit. The 1-Bit radiation unit is composed of a double-sheet microstrip patch and an MEMS switch located between the double-sheet microstrip patch. An opening is formed in a middle connecting line, and a rectangular branch knot is arranged on the outer side of each of the left patch and the right patch; different working states of the MEMS switch change the surface current mode of the biplate microstrip patch, so that the 180-degree reflection phase difference of the radiation unit is realized. The metasurface antenna unit has the advantages of being low in profile, simple in structure and high in integration level, and beam forming and beam tracking of terahertz high gain and narrow beams are achieved.

The invention relates to the technical field of arc fault detection, and discloses a method and device for detecting an arc fault in a switch cabinet, and the method comprises the steps: collecting a three-phase current signal of each feeder loop in the switch cabinet, and obtaining target current data through preprocessing; decomposing the target current data to obtain a plurality of current mode components, and performing clustering reconstruction on the plurality of current mode components to obtain an arc feature set; and inputting the arc characteristic set into the time sequence convolutional network embedded with the Mayr arc physical model to carry out fault identification, and obtaining a fault identification result, the Mayr arc physical model is embedded into the time sequence convolutional network, the arc fault detection accuracy is improved, the full-process automatic response from early warning monitoring to emergency isolation is realized, and the fault identification efficiency is improved. A protection action can be completed before a series arc fault evolves into a serious inter-phase short circuit, and the real-time protection capability of the switch cabinet is improved.

The invention discloses a CMOS analog multiplier circuit, the circuit comprises a current-to-voltage circuit and a multiplier sub-circuit connected with the current-to-voltage circuit, an OSC circuit in the multiplier sub-circuit receives an input voltage VB and a reference voltage VREF and generates a two-phase non-overlapping clock signal group, a voltage-to-current A circuit converts a voltage VA into a current iA, and the current iA is connected with the OSC circuit. The switched capacitor integrating circuit inputs a sampling voltage to the voltage-to-current B circuit and integrates a difference current is of a current iA and a current iB to realize multiplication, the voltage-to-current B circuit converts a sampling voltage signal into the current iB, and the current-to-voltage circuit converts the current iB into an output voltage Vo as a multiplier operation result. Through combination of modular design, a current mode method and a switched capacitor method and high-precision current conversion and integration processes, an efficient and accurate multiplication simulation function is realized, a THD enhancement function is introduced through multiplexing design, and circuit performance is further optimized.

The invention discloses a coaxial double-switch reluctance motor torque ripple minimization control method, which comprises the following steps: establishing a unified model for two switch reluctance motors, obtaining a reference torque through a proportional integral controller after making a difference between a reference rotating speed and an actual rotating speed, and establishing a phase current prediction model according to a phase voltage equation of the switch reluctance motors, based on the predicted current and the predicted angle, establishing a torque prediction model in a positive voltage excitation and zero voltage follow current mode in the conduction interval of each phase winding, and establishing a torque prediction model in a negative voltage demagnetization mode in the turn-off interval of each phase winding to obtain predicted torques of each phase winding in the conduction interval and the turn-off interval; and establishing a unified evaluation function by using the predicted torque and the reference torque of each phase winding of the two switched reluctance motors, and selecting an optimal switching state which enables the evaluation function to be minimum, thereby realizing the torque pulsation minimization control of the coaxial double-switched reluctance motor. The torque ripple minimization control method of the coaxial double-switch reluctance motor is not influenced by the phase difference of the double motors and the conduction range of each phase winding, can be easily expanded to a double-switch reluctance motor driving system with any phase number, and has good application prospect and engineering value.

Methods and apparatus for filtering a signal using a current mode filter circuit that enables source degradation. An example filter circuit generally includes an input node; an output node; a power supply node; a first transistor including a drain coupled with the input node; a second transistor including a drain coupled with the output node and including a gate coupled with a gate of the first transistor; a capacitive element coupled between a drain of the first transistor and the power supply node; a first resistive element coupled between the drain electrode and the gate electrode of the first transistor; a first source degeneration element coupled between a source of the first transistor and the power supply node; and a second source degeneration element coupled between a source of the second transistor and the power supply node.

The invention discloses a low-voltage series arc fault detection method, system and device, and belongs to the technical field of low-voltage series arc fault detection, and the method comprises the steps: obtaining an original current signal, and carrying out the preprocessing through sliding window segmentation and instance normalization; performing multi-scale feature fusion on the preprocessed analysis unit, and generating fusion features through parallel feature extraction and an attention mechanism; performing context modeling on the fused features through an encoder, inputting a self-adaptive bottleneck layer containing an expert hybrid network, and routing the features to the most appropriate expert network by context sensing gating according to global information; the decoder reconstructs the signal and calculates an error, and generates a dense abnormal fraction sequence; gaussian position weighted aggregation abnormal scores are adopted, and fault judgment is carried out in combination with a self-adaptive threshold decision mechanism based on K-Means clustering. The method can be trained without a fault sample, can dynamically adapt to complex current modes under different loads, gets rid of dependence on the fault sample, and accurately detects the arc fault.

A DC / DC converter has a coil connected to a connection point between a main switch and a subordinate switch connected in series; and alternately turns on / off the main switch and the subordinate switch, thereby converting a direct current input voltage into a predetermined direct current output voltage. The DC / DC converter includes a current mode detection unit for detecting either a continuous current mode in which a current flowing through the coil does not pass through a zero point, or a discontinuous current mode in which the current flowing through the coil passes through the zero point, when the subordinate switch is ON; and a subordinate switch control unit for controlling the ON time of the subordinate switch in a next or later cycle, based on a time from turning-off of the subordinate switch until a voltage at the connection point reaches a predetermined threshold value.

The invention discloses an AI-assisted self-adaptive control method and system for a gas safety valve, and relates to the technical field of gas safety control, and the method comprises the following steps: connecting the output end of an SEPIC circuit containing a continuous current mode and a discontinuous current mode with a coil of the gas safety valve; according to preset electrical and gas safety indexes, asynchronous data acquisition is carried out on the electrical and gas safety indexes, and an electrical and gas safety index sequence is obtained; utilizing an AI fusion analyzer on the edge MCU to perform interactive feature fusion analysis on the two types of sequences, and determining a self-adaptive control scheme of the gas safety valve; circuit modes are switched based on the control scheme, and the safety valve is driven to execute according to the switched SEPIC circuit. The technical problems that in traditional gas safety valve control, electric parameters and gas safety indexes are analyzed in a split mode, the circuit operation mode is single, and control response is inaccurate are solved, and the technical effects that efficient and reliable self-adaptive driving of the gas safety valve is achieved, and gas use safety and control flexibility are improved are achieved.

The invention relates to the technical field of temperature control of heat-not-burn appliances, and provides a temperature control method and device of a heat-not-burn appliance, a controller and the heat-not-burn appliance. The method comprises the following steps: after the heat-not-burn appliance is started, reading a current mode flag bit of the heat-not-burn appliance; determining a temperature adjustment value according to the current mode flag bit and a preset temperature difference; according to the temperature adjustment value, adjusting a standard temperature curve of the heat-not-burn appliance; and according to the adjusted standard temperature curve, carrying out temperature control on a heating body of the heating non-combustion appliance. By adopting the method, the temperature curve can be adaptively adjusted by utilizing the mode flag bit, so that the problems of insufficient atomization amount or mouth scalding caused by suction and the like are solved, and the suction experience of a user is improved.

The invention relates to the technical field of charging pile control, in particular to an intelligent charging control method and system for a charging pile. The method includes: acquiring running state information of a power component in the charging pile; when the charging pile is switched from the constant-current charging mode to the constant-voltage charging mode, generating a power regulation strategy instruction executed by the charging pile according to the health state evaluation value, and transmitting the running state information and the power regulation strategy instruction to a battery management system of the vehicle; and the battery management system of the vehicle receives the operation state information and the power adjustment strategy indication, and adjusts the judgment logic of the battery management system on the power output fluctuation of the charging pile according to the health state evaluation value, the expected power fluctuation range and the power adjustment strategy indication. The problems that in the long-term operation of an existing charging pile, performance degradation of internal power components causes charging stability decline, and especially when a constant-voltage mode is switched to a constant-voltage mode, misjudgment of a vehicle battery management system is likely to happen, and charging is interrupted are solved.

Wireless circuitry can include a radio-frequency amplifier configured to operate in a plurality of different mode, configuration, or bias settings, a power detector coupled to an output of the radio-frequency amplifier, a plurality of power integrators, and a switching circuit having an input configured to receive a measured power level from the power detector and having outputs coupled to the plurality of power integrators. The switching circuit can have a switch state that is adjusted based on a current mode, configuration, or bias setting for the radio-frequency amplifier. The power integrators may be part of multiple power control loops. The power control loops can be coupled to additional switching circuitry activated based at least party on the current mode, configuration, or bias setting and a subsequent mode, configuration or bias setting for the radio-frequency amplifier.

Circuits and methods are provided that generate a reference signal in a digital loop for controlling a controller in an analog loop. An analog loop circuit receives a reference signal, determines a first error based the reference signal and a sensing signal in multiple sensing signals, and regulates regulate a system output signal of the system based on the first error. A digital loop circuit converts the system output signal into a digital system output signal, determines a second error between the digital system output signal and a digital reference signal received from a device coupled to the system, determines a control signal using the second error, and converts the control signal into the reference signal.

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

A filter stage system comprising a continuous-time baseband filter comprising a feedback loop employing at least one first impedance node and at least one second impedance node, wherein the at least one first impedance node has a higher impedance than the at least one second impedance node, and wherein the at least one first impedance node provides a dominant pole and the at least one second impedance node provides a non-dominant pole, and wherein the continuous-time baseband filter generates a filtered current, and a mirror component mirrors the filtered current to an output.

Wireless circuitry can include a radio-frequency amplifier configured to operate in a plurality of different mode, configuration, or bias settings, a power detector coupled to an output of the radio-frequency amplifier, a plurality of power integrators, and a switching circuit having an input configured to receive a measured power level from the power detector and having outputs coupled to the plurality of power integrators. The switching circuit can have a switch state that is adjusted based on a current mode, configuration, or bias setting for the radio-frequency amplifier. The power integrators may be part of multiple power control loops. The power control loops can be coupled to additional switching circuitry activated based at least party on the current mode, configuration, or bias setting and a subsequent mode, configuration or bias setting for the radio-frequency amplifier.

The invention discloses a machine tool feeding system fault diagnosis method based on multi-level current characteristic distillation. The method comprises the following steps: collecting vibration and current time domain signals and respectively converting the vibration and current time domain signals into two-dimensional time-frequency diagrams; training a source model by using the vibration time-frequency diagram; cloning and freezing a source model, constructing a target model with the same structure, inputting the current time-frequency diagrams into the source model and the target model at the same time, and optimizing the target model through combination of multi-level feature distillation and a multi-target loss function; and finally, fault diagnosis based on the current signal is realized by using the optimized target model. According to the method, source domain data does not need to participate in training, knowledge migration from a vibration mode to a current mode is realized, the problems of weak current signal fault features and scarcity of labeled samples are effectively overcome, and the fault diagnosis precision and cross-working-condition adaptive capacity under the small sample condition are improved.

The invention relates to the technical field of LED lighting control, and discloses an intelligent LED lamp strip power supply control system with an automatic voltage jump function, which comprises an intelligent control power supply, a series topology LED lamp strip and a plurality of cascaded constant current voltage division control chips, and further comprises a topology discovery and automatic addressing module for detecting the total node number and allocating addresses; the cascade voltage division and dynamic power consumption balancing module is used for calculating a target voltage division value according to the total node number; the power and data cooperative transmission module broadcasts a target partial voltage value on a power supply bus and realizes two-way communication; the node localization constant-current driving module is used for the chip to receive the target voltage division value, adjust the actual voltage division value and drive the LED in a constant-current mode; and the intelligent fault diagnosis and controllable bypass module is used for monitoring a fault of the chip, reporting a fault containing an address and responding to an instruction to activate a bypass. According to the invention, the cascade voltage division and dynamic power consumption equalization module is adopted, so that the technical effects of consistent power and highly uniform brightness obtained by all LED nodes in an ultra-long distance are achieved.

The invention discloses a starting circuit for a band-gap reference circuit, the band-gap reference circuit is a current mode band-gap base conversion circuit and comprises an error amplifier, a first branch, a second branch, a first MOS tube and a first resistor, the first end of the first MOS tube is connected with power supply voltage, the second end of the first MOS tube is connected with a first output node, and the second end of the first MOS tube is connected with a second output node; the first end of the first resistor is connected with a first output node, the second end of the first resistor is connected with a reference potential, the first output node is used for outputting band-gap reference voltage VBG, and the starting circuit is connected between power supply voltage and the reference potential and connected with the band-gap reference circuit. The pull-up module is used for pulling up the voltage VINN on the first input end of the error amplifier or pulling down the voltage VINP on the second input end of the error amplifier so as to reduce the voltage VEA on the output end of the error amplifier. The band-gap reference circuit can be separated from a degeneracy point, and the problem of overshoot of the band-gap reference voltage VBG in the starting process cannot be caused.

The invention discloses a control method and device of a remote controller, equipment and a computer storage medium. The method comprises the following steps: receiving a key operation on a first key on the remote controller, and switching a control mode of the remote controller into a first mode; it can be known that by receiving the key operation of the first key and switching the current mode of the remote controller, the control object of the remote controller can be switched to be the set top box or the television, and finally the control efficiency of the remote controller is improved.

The invention discloses an automatic focusing defocusing amount processing method, an automatic focusing defocusing amount processing system and a medium. The processing method comprises the following steps: screening a defocusing amount conforming to a stroke range and a defocusing amount change amplitude; removing the defocusing amount of which the variable quantity is greater than the change threshold value, and replacing the defocusing amount with the previous non-removed defocusing amount; the focusing state in the current mode is analyzed, so that weighted average calculation is carried out on the current defocusing amount when the focal plane is locked, and filtering of the current defocusing amount is completed; fitting a mapping relationship between the filtered defocusing amount and time to obtain a predicted defocusing amount at the current moment; the defocusing amount with the deviation value smaller than the deviation threshold value is reserved to complete corresponding filtering, and when the deviation value is larger than the deviation threshold value, the actual defocusing amount at the current moment is replaced with the predicted defocusing amount. The method effectively combines the historical trend to realize the prediction and compensation of the current defocusing amount, guarantees the stable and continuous focusing in a complex environment, and is high in robustness and interference resistance.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The embodiment of the invention provides a self-adaptive equalization time energy storage BMS equalization method and device. The method comprises the steps that an energy storage battery management system BMS judges whether the current mode is a charging mode or not; when it is judged that the current mode is the charging mode, the energy storage BMS obtains the voltages of all the battery cells and the minimum battery cell voltage, and collects the equalization resistor temperatures corresponding to all the battery cells; the energy storage BMS judges whether each battery cell meets an equalization condition or not according to the battery cell voltage of each battery cell and the minimum battery cell voltage; and when judging whether any battery cell meets an equalization condition, the energy storage BMS determines equalization starting time and equalization closing time according to the equalization resistor temperature corresponding to the battery cell, and performs equalization processing on the battery cell according to the equalization starting time and the equalization closing time.

The invention discloses a high-voltage power transmission and transformation line equipment insulation aging monitoring method and system, and relates to the technical field of equipment insulation state monitoring, and the method comprises the steps: extracting voltage time-frequency features in a high-voltage time sequence data set to generate a voltage time-frequency feature matrix, and outputting a dual-channel feature pair through separating a current mode component of a current signal; calling standard parameters of the high-voltage equipment, calculating a dielectric loss factor according to the dual-channel characteristic pair, and eliminating measurement deviation through a quantum tunneling effect to obtain a corrected dielectric loss factor; the frequency response characteristic of the corrected dielectric loss factor is analyzed, the aging type is judged by identifying an offset mode, and the aging degree coefficient of the equipment is calculated to divide the state level; and generating a processing scheme based on the aging type, obtaining an execution priority according to the state level, and generating a maintenance instruction set by binding a timestamp. Through the quantum tunneling effect, the response aging is optimized in combination with the dynamic maintenance decision, and closed-loop management of insulation aging from accurate monitoring to active protection is realized.

An audio amplifier that implements current mode control without the use of an explicit or separate current mode sensor is disclosed. The audio amplifier may include a pair of feedback loops that provide current from a node located before an inductor of an output filter and current from a node located after the inductor of the output filter to an integrator circuit. The integrator circuit may be formed from existing circuitry of the audio amplifier controller. Thus, current mode control can be implemented without a separate current mode sensor. Further, the audio amplifier can be implemented as a half bridge or as a full bridge design without increasing the number of operational amplifiers compared to the half bridge.

The application discloses an electrical inspection mobile device, and belongs to the technical field of electrical inspection. The device comprises an inspection vehicle body, a storage box, a positioning box and a transmission mechanism. The storage box is arranged on the inspection vehicle body and is internally provided with a standby cavity and a standby-out cavity which are connected in communication. The positioning box is movably arranged in the storage box and is provided with a positioning lamp. The transmission mechanism is arranged in the standby cavity. The device is moved to the field of a voltage regulating station for mobile inspection, thereby avoiding the current mode of on-site inspection by walking of operating personnel and improving the efficiency. After the device is inspected for failure, the positioning box is driven by the export mechanism to move downward and fall on the ground, so that subsequent workers can timely and intuitively and quickly find the failure position, time and energy are saved, and the possibility of loss and greater failure is reduced. The inspection vehicle body can continuously perform inspection and can mark multiple failure positions, so that the safety of the voltage regulating station is improved.

A differential pulse conveyor system includes detectable markers arranged in series on moving parts of the conveyor system. A stationary sensor positioned near the marker generates a signal to place the marker near the sensor when the moving part is within a first range of motion, and the sensor does not generate a signal when the moving part is outside the first range of motion. The sensor signal causes a current regulating device to adjust the current from a current source to operate a motor to power a conveyor tray to move at a first acceleration rate in a first mode, and the signal activation causes the current regulating device to operate the motor to power the conveyor tray to move at a second acceleration rate in a second mode. The markers can be positioned to optimize the timing of the current mode.