232 results about "Current mode" patented technology

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 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 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.

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 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.

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 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.

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.

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.

The invention belongs to the field of semiconductor lasers, and provides a semiconductor laser diode driving circuit and a driving method. Comprising a single-pole multi-throw analog switch, a power triode driving circuit, a constant current mode feedback loop, a constant voltage mode feedback loop, a constant power mode feedback loop and an incoherent control circuit. The power triode driving circuit comprises a controller, a digital-to-analog converter, a power triode Q1, an integrator circuit based on an operational amplifier, a voltage source VCC, a laser diode V1 and a power resistor R2; the single-pole multi-throw analog switch is connected with the controller, and the controller controls the digital-to-analog converter; the single-pole multi-throw analog switch is respectively connected with the constant current mode feedback loop, the constant voltage mode feedback loop and the constant power mode feedback loop, and switching control of a constant current mode, a constant voltage mode and a constant power mode is realized through channel opening and closing of the single-pole multi-throw analog switch. According to the invention, the defects of single working mode, lack of coherence regulation and control capability and insufficient digitization degree in the prior art are overcome.

The invention relates to the technical field of battery management, and discloses a BMS-based high-voltage power distribution unit thermal management method and device and a commercial vehicle, the BMS-based high-voltage power distribution unit thermal management method is applied to a high-voltage power distribution unit comprising a heat production electrical element and a liquid cooling device, and the heat production electrical element is equipped with a temperature acquisition device. The method comprises the following steps: firstly, acquiring current current data of a high-voltage power distribution unit in a current mode and current temperature data acquired by a temperature acquisition device; based on comprehensive judgment of the current data and the current temperature data, determining a target management instruction; and controlling the liquid cooling device to switch from the current mode to the target operation mode by using the target management instruction. According to the invention, the current data is introduced as the control variable, the active thermal management of the high-voltage power distribution unit is realized, the hysteresis problem caused by triggering only depending on the temperature is solved, and the operation safety of electrical elements is effectively guaranteed.

The application relates to the technical field of charge control, in particular to a control method of a lead-acid storage battery intelligent maintenance device, which can finely divide a voltage curve and calculate the mean value of each interval through real-time collection and analysis of terminal voltage and charging current, provides higher accuracy and real-time performance for state determination of the battery, improves dynamic tracking capability of the battery charging process, greatly improves dynamic adaptability of the battery charging process through adoption of fuzzy logic matching, avoids inefficiency and inadaptation under a fixed voltage and current mode in a traditional method, ensures that each link in the charging process can be optimized and monitored, thereby prolonging the service life of the battery and reducing the fault risk, generates a correction voltage through multiplication of a constant voltage target and a factor, can real-time adjust the voltage in the charging process of the battery, ensures that the battery is always in a suitable working state, and reduces the risk of overcharging and overdischarging.

A current mode controller for a switching converter is provided. The controller includes an error voltage generator for generating an error voltage dependent on an output voltage and a reference voltage; a current sensing module; an error amplifier; and a control signal generator. The current sensing module senses a current flowing through an energy storage element, receives the error voltage, and generates a slope compensated sensed current signal dependent on the sensed current and the error voltage. The error amplifier receives the error voltage, generates an amplified voltage error signal by applying a first amplification coefficient dependent on the error voltage to the error voltage. The control signal generator generates one or more control signals to control the switching operation of one or more power switches of the switching converter, each of the control signals being dependent on the slope compensated sensed current signal and the amplified voltage error signal.

An integrated circuit includes a plurality of current-mode computation (CMC) branches, each including a plurality of CMC cells and a branch summation line. An individual CMC cell includes at least one computation transistor that produces a CMC output current that is a function of a channel current of the computation transistor. A branch summation line receives CMC cell output currents produced by a plurality of CMC cells, and produces a branch output current that is a current-mode summation of all received CMC cell output currents. A layer-one current summation circuit receives the branch output current produced by at least one branch summation line, and produces a layer-one current summation circuit output current that is a function of the received branch output currents. The layer-one current summation circuit may be field-programmable. In operation, the integrated circuit can perform transistor tensor operations by programming one or more layer-one current summation circuits to combine all branch output currents received by those layer-one current summation circuits. Using embodiments of the present invention, millions, billions, trillions or more of the CMC cells can be field-programmed to execute computations in parallel to support transistor tensor operations.

The invention discloses a power electronic equipment cascade stability optimization control method based on a BP neural network, and relates to the field of intelligent control, and the method comprises the steps: building a mathematical model according to the topology and operation characteristics of a DC / DC converter cascade structure employing a dual-active bridge as a core; obtaining three phase-shifting angle parameters, classifying operation modes based on a triple phase-shifting control thought, and constructing a transmission power model; designing a BP neural network for each operation mode, sorting historical operation data of each operation mode into a training set, and performing offline training on the BP neural network through an error back propagation and gradient descent algorithm; the trained BP neural networks are deployed in an actual control system, operation data are collected in real time, the current mode is recognized, the corresponding BP neural networks are called to generate optimization control parameters, the phase shift angle, the voltage and the current are dynamically adjusted, and online optimization control over the stability of the cascade system is achieved.

Apparatus and associated methods relate to a multi-mode multi-phase power control circuit (MMPC). In an illustrative example, the MMPC includes a scalable power phase (SPP) and at least one main power phase (MPP). The SPP, for example, may include a scaled inductor configured to enhance power efficiency in a low power mode. A power controller operably connected to the SPP and the MPP may generate a control signal to the SPP as a function of a user-defined scaling model including an output current scaling factor associated with a current mode of operation. For example, the SPP may be configured as a function of the scaling model, as a full current phase, a partial current phase, or a minimal current phase. Various embodiments may advantageously provide independently regulated power phases having a predetermined fraction of a current output of the MPP.

The application discloses a power distribution network communication fault type identification method and device, electronic equipment and storage medium, the method comprises the following steps: obtaining the voltage mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the voltage fundamental wave amplitude, the voltage main harmonic amplitude and the voltage main harmonic amplitude frequency before and after the occurrence of the communication fault; obtaining the current mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the current direct current amplitude, the current main harmonic amplitude, the current main harmonic amplitude frequency and the current total frequency band amplitude before and after the occurrence of the communication fault; based on the above parameters, a criterion is constructed to determine whether the power distribution network communication fault type is a lightning flashover communication fault or an insulator pollution flashover communication fault. Through the implementation of the application, the lightning flashover communication fault and the insulator pollution flashover communication fault in the power distribution network can be effectively identified, thereby significantly improving the operation reliability of the power distribution network and ensuring the safe and stable operation of the power system.

The application discloses a low-power bandgap reference current source circuit and a control method, and the circuit comprises a current mode bandgap circuit, an error amplifier input stage circuit, a threshold modulation circuit and a current mirror circuit; the current mode bandgap circuit is internally provided with an error amplifier OPAMP and a proportional resistance network; the error amplifier input stage circuit is a PMOS pair tube input stage circuit; the threshold modulation circuit is a source-liner forward bias threshold modulation circuit, which is used for forward biasing the threshold voltage of all PMOS tubes in the low-power bandgap reference current source circuit and enabling the NMOS tube connected with the error amplifier OPAMP output stage to work in a saturation region; and the current mirror circuit is a series diode compensation method current mirror circuit structure. The application is compatible with a standard CMOS process, realizes sub-1V low voltage, micro-nano ampere level low power consumption, high-precision low-noise small area effect, solves various technical pain points of a traditional scheme, and has excellent application prospects in a wearable device power management system.

Certain aspects of the present disclosure generally relate to techniques for operating a three-level buck converter. An example method for operating the three-level buck converter may include: identifying a voltage value based on an input voltage of the three-level buck converter; determining an emulated current for an inductive element of the three-level buck converter based on an expression having a variable associated with a voltage across a flying capacitive element of the three-level buck converter, wherein determining the emulated current comprises assuming the variable to have the voltage value; comparing the emulated current to a threshold; and controlling at least one transistor of the three-level buck converter based on the comparison.

The utility model relates to the technical field of electronic equipment power supply, in particular to an electronic equipment power supply circuit based on a USB (Universal Serial Bus) interface, which comprises a power supply connecting end, a reference power supply connecting end, a voltage comparator, a reference voltage generator, a trigger, a power switch and a voltage output end, wherein the power supply connecting end is respectively connected with the voltage comparator, the reference voltage generator and the power supply switch; the voltage comparator is connected with the trigger through the first switch, the trigger is connected with the power switch through the second switch and the third switch in sequence, and the power switch is further connected with the voltage output end. The reference power supply connecting end is arranged on a line between the voltage comparator and the reference voltage generator, and the reference power supply connecting end is further connected with the first switch, the trigger and the second switch. Through the logic control of the voltage comparator and the trigger, the circuit is ensured to stably supply power to equipment in a proper current mode, and the adverse effect caused by the oscillation of the input voltage is avoided.

The invention discloses a novel auxiliary control system of a gas water heater. The novel auxiliary control system comprises a direct current motor and an auxiliary control panel, the auxiliary control board comprises an AC-to-DC unit, a DC motor control unit and a protection switch signal output unit. The AC-to-DC unit is used for converting an input 220V AC power supply into DC and supplying the DC to the DC motor control unit; the direct current motor control unit is used for controlling rotation of the direct current motor and monitoring the running state of the direct current motor, and the MCU drives the direct current motor in a constant-current mode and conducts high-dynamic-response motor rotating speed closed-loop control. The auxiliary control system of the gas water heater is formed only by replacing an alternating-current motor with a direct-current fan, cancelling a wind pressure switch and assembling an auxiliary control panel under the condition that the whole structure and the main control system of the existing alternating-current gas water heater are not changed, so that the fault rate of the gas water heater is reduced, the performance is more stable, and energy is saved; and meanwhile, the wind pressure resistance of the fan is enhanced.

The application provides a photovoltaic system and a method for identifying access of a disconnector of the photovoltaic system and setting an operation mode, the method for identifying access of the disconnector of the photovoltaic system is as follows: voltage disturbance is performed on at least one target photovoltaic string in the photovoltaic system, the target photovoltaic string is a photovoltaic string with a string voltage lower than a safety voltage in the photovoltaic system; it is judged whether at least one string voltage greater than the safety voltage exists in the string voltages of each disturbed target photovoltaic string; if the result is yes, it is identified that the photovoltaic system is connected to the disconnector, that is, the application can utilize the characteristic that the disconnector needs to be subjected to regular voltage disturbance to keep continuous operation, identify the access state of the disconnector of the photovoltaic system by the size relationship between the disturbed photovoltaic string voltage and the safety voltage, and solve the problems of complicated operation and occupation of a large amount of manpower and material resources caused by the current mode of confirming whether the photovoltaic system is connected to the disconnector by the user on site.

The disclosure relates to a method of measuring winding electrical parameters in a bipolar stepping motor during hold conditions. Disclosed herein is a method for controlling a stepper motor driver comprising control logic, a digital-to-analog converter (DAC), and two H-bridge circuits for controlling a first winding and a second winding of a bipolar stepper motor. The method includes determining a desired current signal for the winding based on a rotational position of the stepping motor, converting the desired current signal to an analog reference voltage using the DAC, generating a pre-drive signal based on the analog reference voltage, and controlling the H-bridge circuit to regulate a current through the winding using the pre-drive signal. A voltage drop across the sense resistor is monitored as feedback by the control logic. The desired current signal is determined by generating periodic current patterns of the windings over time, the current pattern of the second winding being phase shifted with respect to the current pattern of the first winding, and the two current patterns being dependent on the step frequency of the bipolar stepping motor.

The invention discloses a detection-free zero-voltage switching-on method based on a full-bridge inverter intermittent current mode, and relates to a power electronic converter. The micro inverter works in an inductive current intermittent conduction mode, zero-voltage switching-on of a switching tube can be realized on the basis of not adding any additional device and auxiliary circuit, and the efficiency of the inverter is effectively improved. The traditional scheme generally depends on a sampling circuit to detect a resonance current zero crossing point between an inductor and a switch tube shunt capacitor to determine the turn-on time, so that the hardware complexity is increased, and the zero-voltage turn-on effect depends on the reliability of a detection circuit. And when the switching frequency is relatively high, the inherent delay characteristic of the sampling circuit can limit the zero-voltage switching-on realization effect. The invention provides a zero-voltage turn-on moment determination strategy based on inverter behavior modeling in an intermittent conduction mode, a detection circuit is not needed, and the zero-voltage turn-on moment can be accurately determined only through discrete time control by a controller after modeling, so that full-period soft switching is realized, and the hardware complexity is reduced.

A power controller and a control method for a power converter with soft turn-on and soft turn-off. The power converter includes an inductor element and a power switch for controlling an inductor current flowing through the inductor element. The power controller includes a voltage mode controller and a current mode controller. The voltage mode controller controls an on-time of the power switch based on a feedback signal and a sawtooth signal. The feedback signal is generated based on an output voltage of the power converter. The current mode controller controls the on-time based on a current limit signal and a current sense signal to limit the current sense signal. The current sense signal represents the inductor current. The current mode controller includes a limit signal generator for providing the current limit signal based on the feedback signal and a triangular wave signal and determining a soft turn-on time and a soft turn-off time. The limit signal generator increases the current limit signal over time during the soft turn-on time and decreases the current limit signal over time during the soft turn-off time.