227 results about "Average current" patented technology

The invention provides a welding method and device, electronic equipment and a storage medium, and belongs to the technical field of intelligent manufacturing. A target wire feeding speed corresponding to the actual average current value is determined according to the target compensation relation; the actual wire feeding speed is adjusted to the target wire feeding speed; the target compensation relation is determined from the compensation relation set based on the target average current value, and the target compensation relation comprises the corresponding relation between the actual average current value and the target wire feeding speed. Through the pre-established compensation relation, the wire feeding speed can be actively adjusted in the welding process according to the deviation of the monitored actual average current value so as to compensate the deviation in real time, and therefore it is guaranteed that the heat input amount in the whole welding process is constant, and the welding quality is improved. The technical problems of welding current fluctuation and inconsistent welding seam forming caused by dry elongation change due to factors such as out-of-roundness of workpieces are solved, and the quality and reliability of welding seams are remarkably improved.

The invention relates to the technical field of electric tool control, in particular to a motor control method of a target electric tool and a motor control circuit executing the motor control method, and the method comprises the steps: obtaining peak current at a detection resistor and a current PWM signal duty ratio, calculating real-time average current according to the peak current and the current PWM signal duty ratio, and comparing the real-time average current with an average current threshold value; and adjusting the duty ratio of the PWM signal according to the result, and outputting the PWM signal to drive the motor according to the adjusted duty ratio. By dynamically adjusting the duty ratio, the stability and safety of the electric tool under high load are effectively improved, the operation experience is optimized, the hardware upgrading requirement can be met, and the use bottleneck is broken through.

The invention discloses a fault diagnosis method, device and equipment for an NPC three-level inverter and a medium, and relates to the technical field of inverter fault diagnosis, and the method comprises the steps: building a fault stator current analysis model according to a fault stator current change rule of the inverter; a fault phase and a fault bridge arm are extracted and positioned by using a sliding window averaging method; and calculating and setting a fault positioning reference value under an ideal condition, and comparing the fault positioning reference value with a fault positioning actual value under an actual condition to position a faulted IGBT (Insulated Gate Bipolar Translator). A fault stator current analysis model is established to simulate a set current change condition under an ideal condition, a fault positioning reference value is calculated, and whether an actual fault condition is consistent with a set ideal fault condition is distinguished by a deviation between the fault positioning reference value and a fault positioning actual value of an actual condition, and whether a fault is an inner pipe or an outer pipe is positioned. During calculation, a current mean value from a fault moment to a first zero-crossing moment is utilized, a fault IGBT can be positioned in a fundamental wave period, and fault diagnosis and positioning can be quickly and efficiently carried out.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

The invention relates to the technical field of backlight control, in particular to an LED display-oriented adaptive PWM backlight control method and a backlight driving system, which are suitable for the backlight driving system comprising a boost converter, a brightness controller and an LED channel, and the method comprises the following steps: the brightness controller outputs a control voltage, a peak current control word and a duty ratio signal, and receives a state signal. Receiving brightness data, determining a nominal peak current and a duty ratio, and initializing the nominal peak current and the duty ratio; adjusting the control voltage to change the boost output, monitoring the state, locking the working point when all states are converted from the first state to the second state, and taking the final switching channel as a reference; a peak current word is increased for the non-reference channel under the working point, and when the state returns to the first state from the second state, an optimized peak current is taken back; and adjusting the duty ratio according to the ratio of the nominal peak current to the optimized peak current to enable the average current of each channel to be consistent. According to the invention, the problem that excessive voltage drop of a linear current regulator causes extra power consumption and heating and influences the brightness consistency between channels is solved.

The invention belongs to the technical field of battery charging and discharging, and discloses a bidirectional DC-DC inductive current digital sampling correction method and system.The method comprises the steps that electrical parameters of a converter are obtained, input power is calculated, meanwhile, the set working mode of the converter is judged, the working state of the converter is analyzed according to the set working mode, and the output power of the converter is calculated; calculating a duty ratio feed-forward coefficient and an inductance average current correction coefficient in combination with the electrical parameters; and calculating an inductive current average value based on the inductive average current correction coefficient and the inductive current sampling value, substituting the inductive current average value and a duty ratio feed-forward coefficient into a loop, calculating an actual duty ratio, and driving a power tube to work. On the basis of classical voltage and current double-closed-loop control, a duty ratio feed-forward control algorithm is added, the response speed of the system is improved, meanwhile, based on a duty ratio feed-forward coefficient, an inductive current digital sampling correction method is provided, the sampling accuracy of the inductive average current is improved, and then the performance of the battery charging and discharging test system is improved.

The application relates to a cable current correction measurement method based on an open-loop structure TMR sensor, which comprises the following steps: S1, installing TMR sensors S1 and S2 on an open-loop mechanical structure; S2, obtaining a magnetic field strength vector of a magnetic field excited by a cable current at positions of the sensors S1 and S2, and obtaining a magnetic field strength component in the direction of a sensor sensitive axis through vector operation; S3, obtaining a mathematical equation about unknowns introduced by only the sensor S1; S4, solving the nonlinear mathematical equation established in the step S3 to obtain a cable current value; S5, judging whether the obtained current value meets a preset condition, if yes, storing the current value, otherwise, continuing to perform optimization calculation; S6, discarding unreasonable current values after a sample capacity N is reached; S7, fitting sample current values by using an interpolation polynomial, and finally obtaining an average current value. Compared with the prior art, the application has the advantages that the cable current value can be effectively calculated.

The application discloses a pinch-proof current threshold calculation method, system and device, and a storage medium. The pinch-proof current threshold calculation method comprises the following steps: dividing the whole Hall stroke into multiple Hall regions according to current characteristics; collecting current data in a complete motor motion process multiple times in each Hall region to obtain multiple sets of current data of each Hall region; setting a pinch-proof current threshold of each Hall region according to the multiple sets of current data of each Hall region; in each motor motion process, calculating a current average current value of each motor motion through a corresponding Hall region, and judging whether the current average current value changes relative to the last average current value; if the current average current value changes, the pinch-proof current threshold of the Hall region is recalculated and updated; otherwise, the pinch-proof current threshold does not change. The application can dynamically adjust the pinch-proof current threshold, and solves the problem that the motor current characteristics change with the use time, resulting in the failure of the pinch-proof function.

The invention belongs to the technical field of wind power generation, and particularly relates to a wind-solar complementary power generation system fault diagnosis and identification method and system.The method comprises the steps that voltage, current and surface temperature data of a storage battery pack are collected in real time, and the current change rate at the current moment is calculated; when the current change rate exceeds a set threshold value, marking the current moment as an impact starting point, and intercepting data before and after the impact starting point to form an impact time window; in the impact time window, based on the current variable quantity of each moment, the temperature correction factor corresponding to the surface temperature and the window average current, constructing a load impact strength index of each moment by using a logarithmic function, and constructing a voltage recovery elasticity index of each moment in combination with a standard deviation of voltage fluctuation in the impact time window; and comparing the voltage recovery elasticity index with a preset health threshold to judge whether the storage battery is normal or failed. According to the invention, the accuracy and reliability of fault diagnosis are improved.

A circuit and method for measuring an average current of a solenoid valve, relating to the technical field of automotive electronics. The circuit comprises a solenoid valve (110), a first power supply (120), a sampling resistor, a field effect transistor drive circuit (130), a current acquisition circuit (140), an integrator circuit (150), and an integration reset circuit (160); the field effect transistor drive circuit (130) is used for controlling an on-off state of a first field effect transistor on the basis of a pulse width modulation gating signal; the first power supply (120) is used for providing a drive current for the solenoid valve (110) when the first field effect transistor is in an on state, and the drive current flows through the sampling resistor; the current acquisition circuit (140) is used for sampling voltage signals on two sides of the sampling resistor, and outputting the voltage signals to the integrator circuit (150); the integrator circuit (150) is used for performing integration processing on the voltage signals, and determining an average current of the solenoid valve (110) on the basis of an integration result; and the integration reset circuit (160) is used for performing periodic reset processing on the integrator circuit (150) on the basis of the pulse width modulation gating signal.

The embodiment of the invention discloses a method and system for evaluating the charge elimination performance of ionization equipment and computer equipment. The method comprises the following steps: acquiring the duration of each sampling period and the average current of a polar plate capacitor connected with ionization equipment in each sampling period; obtaining a voltage change value of the polar plate capacitor in each sampling period based on the duration of each sampling period and the average current of the polar plate capacitor in each sampling period; generating a voltage-time curve of the polar plate capacitor based on the initial voltage and the voltage change value of the polar plate capacitor in each sampling period; and obtaining an evaluation result of the charge elimination performance of the ionization equipment based on the voltage-time curve. The problems that at present, an accurate and efficient method for evaluating the electricity elimination performance of the ionization equipment is lacked, and the actual electricity elimination capacity of the ionization equipment under different working conditions is difficult to accurately judge are solved.

Current limits are set for detecting anomalous current drain of a battery in an electrical system during a Key-Off state of a vehicle. A plurality of test vehicles are selected which are operational without any anomalous current drain. A plurality of time intervals are identified according to a plurality of predetermined Key-Off-Load (KOL) modes which are activated successively after initiation of the Key-Off state. Key-Off interval currents are measured during each of the time intervals in each of the test vehicles. A respective average current of the interval currents is determined in each respective time interval. A respective standard-deviation current of the interval currents is determined in each respective time interval. A respective current limit is set corresponding to each time interval according to the respective average current plus a respective incremental value determined according to the respective standard-deviation current.

The application discloses a rudder shaft hole key groove electric spark machining method and a machining system, and belongs to the technical field of electro-hydraulic rudder machining. The problems of low rudder shaft qualification rate, low machining efficiency and high machining cost are solved. The electric spark machining method comprises a rough machining process and a rounding process. In the rough machining process, a first electrode is configured on an electric spark machining device, and the electric spark machining device processes a key groove in the rudder shaft hole according to preset electric parameters. In the rounding process, a second electrode is configured on the electric spark machining device, and the electric spark machining device controls the second electrode to perform rounding treatment on the key groove according to preset electric parameters. The preset electric parameters include a preset pulse width, a preset average current, a preset pulse interval and a preset amplitude voltage.

This application discloses a current sampling circuit, a power management chip, and an electronic device. The current sampling circuit is used to detect the average current of two alternately conducting low-side power transistors. It includes a displacement switch, a first operational amplifier circuit, and a current sensing transistor. The non-inverting input of the first operational amplifier circuit is alternately connected to the sources of the two low-side power transistors through the displacement switch. The inverting input of the first operational amplifier circuit is connected to the current sensing transistor. The output of the first operational amplifier circuit is connected to the output of the current sampling circuit. The current sensing transistor is also connected to the output of the current sampling circuit and ground, respectively. The current sensing transistor and the low-side power transistors are of the same type, and their on-resistances are proportional. This current sampling circuit can perform non-destructive testing of the low-side power transistors of a power management chip.

The invention discloses a neutral-point voltage balance control method for a three-level back-to-back frequency converter based on zero-sequence voltage injection, and belongs to the technical field of power electronics. The neutral-point voltage balance control method comprises the following steps: acquiring input three-phase voltage and current of a rectifier, output three-phase voltage and current of an inverter and voltage instantaneous values of two capacitors of a direct-current bus through voltage and current Hall components; the signals are input into the DSP after being subjected to conditioning circuit and A / D conversion; the DSP processor obtains a midpoint average current needing to be compensated by calculating a positive and negative bus capacitor voltage difference, and determines a rectification side midpoint average current reference value by combining the inversion side midpoint average current; based on the characteristic that zero-sequence voltage of a three-phase three-wire system does not affect line voltage, key zero-sequence voltage is selected within a limited range by establishing the relation between midpoint average current and the zero-sequence voltage on the rectification side, and PWM modulation waves are adjusted to achieve midpoint voltage balance. The method is simple in calculation, high in real-time performance and suitable for all modulation degree scenes.

This invention provides a method and system for monitoring and adaptively calibrating the blade condition of a hawthorn slicer based on multi-sensor fusion. It collects spindle motor current signals, blade holder vibration acceleration signals, and slice images, and extracts feature values. When the vibration feature value changes abruptly and the current feature value decreases simultaneously, blade breakage is detected, triggering an emergency stop. If breakage is not detected, the average current trend is monitored to generate a wear warning. Visual acquisition is initiated according to preset conditions to obtain the actual slice thickness. Using a pre-calibrated mapping relationship between slice thickness and current and vibration feature values, the threshold compensation amount is calculated in reverse based on the thickness deviation, adaptively correcting the detection threshold. This invention reduces the false blade breakage rate, achieves proactive wear warning, compensates for sensor drift, and ensures a high slice yield.

The application relates to the technical field of power equipment, in particular to an intelligent monitoring method for contact resistance faults of a ring main unit, which comprises the following steps: periodically collecting current data, calculating average current, drawing a period average current curve, converting discrete current data into a continuous trend curve, and intuitively reflecting the dynamic change of the contact resistance, for example, when the contact resistance increases, the current will present a downward trend with the period, and the absolute value of the curve slope will change accordingly, the change can be captured in real time through the curve, compared with static data collection, the method can accurately depict the process of resistance change, provides a more comprehensive trend basis for subsequent analysis, and solves the problem that the current data is not fully applied in the prior art; in the application, the absolute value of the curve slope is calculated and compared with a preset absolute value, so that the strong operation fault tendency or the weak operation fault tendency can be determined at the initial stage of the poor contact problem.

The application discloses a kind of modular parallel solid-state circuit breaker current sharing control device and method, multiple solid-state circuit breakers are parallel, and current balance between solid-state circuit breaker is realized based on current sharing control technology.The current of n solid-state circuit breakers is detected in real time, the actual current of the first n-1 solid-state circuit breakers is closed-loop regulated using closed-loop control technology, corresponding drive control signal correction is generated, and then the equivalent on-resistance of solid-state circuit breaker is adjusted by drive control signal, so that the actual current of n-1 solid-state circuit breakers is equal to average current.The drive control signal correction of the first n-1 solid-state circuit breakers is summed and inverted, and used as the drive control signal correction of the nth solid-state circuit breaker, so that the overall average equivalent resistance remains unchanged.The application realizes the modular combination of solid-state circuit breaker, and only one specification of solid-state circuit breaker can meet the needs of circuit breaker of different current levels, with great application prospect.

This application relates to a method, apparatus, device, and storage medium for equalization control of bidirectional non-isolated DC-DC converters, applied in the field of power electronics. The method includes acquiring the number, output current, and state of charge (SOC) of several bidirectional non-isolated DC-DC converters; calculating and distributing the average current and average SOC based on the number, output current, and SOC; controlling the converters to calculate an outer-loop reference voltage based on their respective output current, SOC, and average current and average SOC through a voltage droop loop, an average current loop, and a SOC correction loop; wherein the voltage droop loop has a faster response speed than the average current loop, and the average current loop has a faster response speed than the SOC correction loop; controlling the converters to calculate their respective inner-loop reference current based on the outer-loop reference voltage; and controlling the converters to track their respective inner-loop reference current through a built-in current inner loop. The technical advantages of this application are: achieving equalization control and improving system stability.

A load control device for controlling the amount of power delivered to an electrical load is able to operate in a normal mode and a burst mode. The load control device may comprise a control circuit that activates an inverter circuit during active state periods and deactivates the inverter circuit during inactive state periods. The control circuit may operate in the normal mode to regulate an average magnitude of a load current conducted through the electrical load to be above a minimum rated current. The control circuit may operate in the burst mode to adjust the average magnitude of the load current to be below the minimum rated current. The control circuit may adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant.

The invention discloses a microgrid energy scheduling method based on feedforward neural network parameter optimization, and relates to the technical field of interconnection converter control. Obtaining an average current difference value and an average voltage difference value between the first micro-grid and the second micro-grid based on the average current of the first micro-grid and the second micro-grid and the per unit value of the average voltage observation value; inputting the average current difference value into a first proportional integral controller to obtain a first phase shift angle component, and inputting the average voltage difference value into a second proportional integral controller to obtain a second phase shift angle component; determining the sum of the first phase shift angle component and the second phase shift angle component as a phase shift angle of an interconnection converter between the first micro-grid and the second micro-grid; and modulating the phase shift angle through a phase shift modulator to obtain a switching signal of the interconnection converter. According to the method, the transient performance of different micro-grid voltages in the interconnected micro-grid can be balanced, so that the power supply reliability of the interconnected micro-grid system is ensured.

A control device for a DC-to-DC converter includes: an electric current calculation unit that calculates, based on electric current detection values of an electric current detection unit, an average electric current that is a time average value of electric current flowing through a reactor in one switching cycle; a duty ratio calculation unit that calculates, based on a command value of the average electric current, a duty ratio in a discontinuous current mode; and a switch control unit that performs, based on the calculated duty ratio, switching control of a switch. Moreover, the duty ratio calculation unit is configured to: calculate, based on the duty ratio and the average electric current calculated in a plurality of past switching cycles, relationship information between the average electric current and the duty ratio; and calculate, based on the calculated relationship information and the command value, the duty ratio in a next switching cycle.

The present application relates to the technical field of scraper conveyor control, a heavy load transmission device and a flexible start-stop control method of a scraper conveyor, comprising: based on a scraper conveyor start instruction, a preset collection interval and a working condition sensing controller, a load state parameter collection operation is performed to obtain a load state parameter, an average current value is calculated, a low load threshold and a regular load threshold are calculated, a flexible start control operation is performed on the scraper conveyor to obtain a stable running scraper conveyor, the current running speed and the current motor current value are obtained, the coal mining machine parameters are confirmed, an adaptive speed control operation is performed on the stable running scraper conveyor to obtain a normally running scraper conveyor, a flexible stop control operation is performed on the normally running scraper conveyor to obtain a stopped running scraper conveyor, and the flexible start-stop control of the scraper conveyor is completed based on the stopped running scraper conveyor. The present application can realize flexible start-stop control without impact start-stop and dynamic load adaptation.

The present disclosure provides a power adapter and a control circuit, a standby detection circuit and a method thereof. The output end of the power adapter is provided with an interface unit, the interface unit is connected to a device to be charged through a pluggable charging cable, and the standby detection method comprises: switching the working state of the power adapter according to the connection state of the charging cable and the device to be charged; and controlling to reduce the average current of a first detection circuit in a first standby state, wherein the first detection circuit is used to detect whether the interface unit is inserted or removed from the charging cable, and the interface unit is inserted into the charging cable and not connected to the device to be charged in the first standby state. By reducing the average current flowing through the pull-down resistor of the charging cable, the standby power consumption in the first standby state is reduced, and the connection state of the charging cable can be effectively detected.

This invention belongs to the field of electrical equipment condition monitoring technology, specifically relating to an intelligent monitoring method and system for high-voltage switchgear. The method includes the following steps: collecting historical closing data for each operating condition of a vacuum circuit breaker under brand-new conditions; calculating the average current, average power factor, and average slope for each operating condition to obtain the operating condition baseline; constructing an operating condition R matrix using the variance of electrical quantities for each operating condition; calculating the current rise slope after each closing operation; comparing the current rise slope with the average slope of each operating condition baseline, and taking the nearest neighbor to obtain the operating condition label; collecting the average current and average power factor during the current steady-state period; and subtracting the average current and average power factor from the operating condition baseline corresponding to the operating condition label to obtain the observation deviation. This invention eliminates the need for additional sensors, relying on existing programmable logic controller signals to achieve continuous quantitative monitoring of early deterioration of vacuum circuit breaker contacts throughout the entire lifecycle.

This invention belongs to the field of large component splicing technology and discloses a method for welding spliced ​​plates, including: S1, opening a V-shaped bevel on a first and a second plate to be welded, the angle of the V-shaped bevel being 15-20°; S2, welding on the front side of the V-shaped bevel; S3, using welding material and a welding torch to weld the first and second plates to be welded along the V-shaped bevel, the welding torch being connected to a power controller, the power controller being connected to a first power supply and a second power supply, the first power supply being able to output a first voltage of 10-30V, the second power supply being able to output a second voltage of 40-60V, in the first state the welding torch is connected to the first power supply, in the second state the welding torch is connected to the second power supply, the power controller controlling the switching frequency of the first and second states to adjust the average voltage and average current of the welding torch; the V-shaped bevel has a small slope, the amount of welding material filling is small, the welding efficiency is high, the low and high voltages change intermittently, single-sided welding achieves double-sided forming, eliminating the need for flipping the welding plate, saving steps.

The invention provides a method for testing the saturation current of an IO port, and the method comprises the steps: a, measuring a first average current flowing through a source input end corresponding to an MOS tube when the MOS tube in the IO port is in a cut-off state; b, an MOS tube in the IO port is controlled to be switched between a conduction stage and a cut-off stage, and the MOS tube is always in a saturated state in the conduction stage; c, measuring a second average current flowing through the source input end corresponding to the MOS tube in the process of the step b; and d, obtaining the IO port saturation current according to the difference value of the first average current and the second average current and the proportion of the conduction time T1 and the cut-off time T2 of the MOS tube.

The invention relates to the technical field of power supply control, and discloses a current space vector decoupling control method, system and device for a dual-active bridge type single-stage AC-DC converter and a medium, and the method comprises the steps: enabling the dual-active bridge type single-stage AC-DC converter to be equivalent to two independent dual-active bridge type DC-DC converters in a control period, an alternating current side three-phase current synthesis vector is decomposed to calculate an input average current, a duty ratio is determined in combination with parameters such as an input line voltage and an instantaneous voltage transformation ratio, a switch tube action logic is generated, and a current space vector decoupling modulation strategy is realized. According to the method, the problem of alternating current side transmission current distortion is solved, the actual alternating current side transmission current of the system approaches a given value more accurately, and grid side current distortion is reduced. And meanwhile, the action logic of a switching tube is accurately controlled, the internal circulation of the converter is reduced, the system efficiency is improved, the buck-boost characteristic of the dual-active bridge type single-stage AC-DC converter is exerted, and the actual requirement of an AC grid-connected energy storage system is better met.

The application provides a method for measuring impedance of a hydrogel, comprising the following steps: powering an electrotherapy signal generator by a power supply to make the electrotherapy signal generator output an electric stimulation signal with preset electric stimulation parameters, and obtaining corresponding average current values of the power supply when the output end of the electrotherapy signal generator is connected to different impedance loads to obtain a data table; powering the electrotherapy signal generator by the power supply to make the electrotherapy signal generator output an electric stimulation signal with the preset electric stimulation parameters, and obtaining an average current value of the power supply when the output end of the electrotherapy signal generator is connected to a test assembly containing a hydrogel to be tested, and recording the average current value of the power supply as a comparison value; querying the data table, and if there is an average current value of the power supply equal to the comparison value in the data table, taking the impedance value of the load corresponding to the average current value of the power supply as the measured impedance value of the hydrogel to be tested. The application can measure the impedance of the hydrogel in a real state, and the measurement result is more accurate.