386 results about "Peak current" patented technology

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 relates to an unbalanced data-oriented electric power system lightning disaster risk detection method, which comprises the following steps of: S1, gridding a target detection land parcel to obtain a plurality of grid units; S2, based on latitude and longitude coordinates of each grid unit, obtaining line parameters and environment characteristics of each grid unit in combination with a line database and a geographic information base, wherein the line parameters comprise tower height, span, grounding resistance, loop number, lightning arrester number and transformer capacity, and the environment characteristics comprise soil conductivity, building height and land utilization type; and S3, inputting the line parameters and the environment characteristics of each grid unit into a trained first detection model to obtain the thunder and lightning probability and the maximum peak current of each grid unit. Compared with the prior art, the multi-source data such as the tower height, the span, the grounding resistance and the soil conductivity are comprehensively considered, and the risk assessment result has higher regional adaptability and accuracy.

The invention relates to the technical field of electrical equipment state monitoring, in particular to an intelligent circuit breaker electrical life detection method and system based on data analysis. The method comprises the following steps: synchronously acquiring opening coil voltage and current sequences, a main loop current sequence and environment temperature data when a circuit breaker acts, extracting actually measured action time based on the coil data, and calculating a mechanical health degree factor by combining the environment temperature and the actually measured action time; after decoupling correction is carried out on an electrodynamic force interference factor derived by a peak current of a main loop, a mechanism wear state index is obtained; a nonlinear damage model containing basic electric heat loss and mechanical degradation acceleration factors is constructed, a single-time electric life loss value is calculated, historical loss values are accumulated, a dynamic threshold value is combined to realize full-life-cycle prediction, and evaluation interference of environmental factors and large-current electrodynamic force is eliminated through deep data analysis. The nonlinear acceleration effect of mechanism hysteresis on contact ablation is quantified, and the detection precision is remarkably improved.

A tool is provided including a motor, a power switch circuit disposed between a power source and the motor, and a control unit that controls the power switch circuit to drive the motor. The control unit is configured to apply a current clip threshold to a current passing through a bus line located between the power source and the power switch circuit to maintain a peak current of the bus line at approximately the current clip threshold. The control unit is further configured to variably control the current clip threshold based on the current passing through the bus line.

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 relates to the field of electronic power, particularly discloses a bridge resonant converter based on forward and reverse shock coordination of double transformers, and belongs to the technical field of power electronic conversion. Aiming at the problems of over-high peak current, high magnetic core saturation risk, remarkable switching loss and the like of a traditional LLC resonant converter under the requirements of a wide load range and high power density, the invention provides the following innovative schemes: a dual-transformer forward and reverse excitation collaborative structure, a zero voltage switching (ZVS) driving technology and resonant network parameter optimization.

Aspects disclosed in the detailed description include a processor-based system configured to dynamically mitigate peak current demand of a shared power rail powering a memory system. The processor-based system includes a plurality of processing units which utilize the memory system. The memory system is powered by the shared power rail. The processor-based system monitors a current demand of the shared power rail from the plurality of processing units, determines whether the current demand for the shared power rail exceeds a peak threshold, and, in response to the current demand exceeding the peak threshold, throttle one or more operating parameters of at least one of the plurality of processing units to reduce or slow access to the memory system and, thus, the current demand over the shared power rail.

The invention relates to the field of electrochemical energy storage systems, in particular to a multi-energy complementary electrochemical energy storage system adaptive to load power abrupt change, which comprises a multi-source energy supply component, a power conversion module, an instantaneous power compensation unit (supercapacitor), a direct current bus, an energy storage converter and a central controller. The multi-source energy supply assembly is connected to the direct-current bus through the corresponding power conversion module, the super capacitor is directly connected with the direct-current bus, the energy storage converter is connected with the direct-current bus and the load, and the central controller is connected with all the assemblies. And when the load instantaneous power abrupt change exceeds a threshold value and the bus voltage deviates from an allowable range, the supercapacitor automatically triggers charging and discharging response, releases or absorbs peak current, and fills a power gap. According to the system, instantaneous load compensation is undertaken through the supercapacitor, a low-rate lithium battery and multi-energy priority power supply and dynamic power distribution are matched, an impact load is quickly responded, meanwhile, the system cost is reduced, the power supply stability and safety are improved, and the energy utilization efficiency is optimized.

Technologies and implementations for a wake-up circuit. The wake-up circuit may be configured to reduce a peak value of current draw during waking up of an electronic device. The reduction of the peak value of current draw facilitates a reduction of electrical burden on various components of related circuit. Managing wake-up of circuits may include managing wake up of memory.

The invention discloses a SiC MOSFET junction temperature on-line acquisition circuit which is connected with a to-be-measured SiC MOSFET for junction temperature acquisition, an independent grid peak current acquisition circuit is additionally arranged, and a low-frequency intermittent sampling strategy is adopted, so that a sampling resistor is in a non-working state in most of time, temperature rise is inhibited, the stability of the resistance value of the sampling resistor is ensured, and the reliability of the sampling resistor is improved. Accuracy of grid peak current acquisition and junction temperature prediction precision are substantially improved. The invention also discloses a SiC MOSFET junction temperature on-line acquisition method. According to the SiC MOSFET junction temperature on-line acquisition circuit and method provided by the invention, the grid resistance network and the grid peak current acquisition circuit are constructed, so that the self-heating problem of the sampling resistor under a high-frequency switch is solved.

A method for controlling pulse arc welding involving feeding a welding wire and applying a welding current by repeating a pulse cycle including: a peak rising period of applying a peak rising current increasing from a base current to a peak current; a peak period of applying the peak current; a peak falling period of applying a peak falling current decreasing from the peak current to the base current; and a base period of applying the base current. The feed speed of the welding wire is changed such that it beings to change from a reverse-feeding peak value toward a forward-feeding peak value at a point earlier by a first preceding period than the start of the peak rising period. Then, the feed speed reaches the forward-feeding peak value at a point earlier than an end of the peak rising period, and beings to change from the forward-feeding peak value toward the reverse-feeding peak value at a point earlier by a second preceding period than the start of the peak falling period, and reaches the reverse-feeding peak value at a point earlier than an end of the peak falling period.

The invention provides an error amplifier for peak current mode control and a converter system. The error amplifier comprises a transconductance amplifier, a voltage clamping module, a voltage-current converter, a slope compensation module, a current clamping module and a mirror image tube, the negative end of the transconductance amplifier is used for loading feedback voltage, and the positive end is used for loading reference voltage; the output end of the transconductance amplifier, the output end of the voltage clamping module and the input end of the voltage-current converter are electrically connected; the voltage-current converter generates error current; the slope compensation module is used for performing slope compensation on the error current to generate a compensated current; the output end of the slope compensation module, the output end of the current clamping module and the positive end of the high-side comparator are electrically connected with a second reference node; and the mirror image tube is used for loading the comparison voltage to the positive end of the high-side comparator. The error amplifier provided by the invention can realize more stable mode switching and more accurate current limiting control.

The invention discloses a control device of a magnetic suspension bearing driver, a magnetic suspension bearing and a control method of the magnetic suspension bearing driver, and the device comprises a control unit which outputs a first group of control signals to an auxiliary resonance unit; the auxiliary resonance unit is arranged on the input side of the bridge circuit and provides bus voltage for the input side of the bridge circuit under the control of the first group of control signals output by the control unit based on preset power supply voltage; the control unit is also used for outputting a second group of control signals to the bridge circuit; and the bridge circuit is used for realizing soft switching control under the control of the second group of control signals output by the control unit based on the bus voltage provided by the auxiliary resonance unit. According to the scheme, the auxiliary resonance circuit is additionally arranged in front of the bridge circuit, and the equivalent capacitor module is additionally arranged in the bridge circuit, so that the switching power amplifier in the bridge circuit realizes zero-voltage starting, the switching peak current can be reduced, the power loss is reduced, and the service life of the switching power amplifier is prolonged.

The invention relates to the technical field of electronic device state evaluation, in particular to a service life judgment method and system for a high-voltage direct-current contactor. The method comprises the following steps: in each on-off action process of the direct current contactor, synchronously acquiring arc duration, peak current, contact temperature rise and pull-in delay time to form a physical quantity data set of single operation; calculating a thermal damage component according to the contact temperature rise and the arc duration, multiplying the peak current square by the contact resistance obtained by real-time measurement to obtain an electrical damage component, and determining a mechanical damage component based on the pull-in delay time; and calculating the weighted sum of the thermal damage component, the electrical damage component and the mechanical damage component, and recording the weighted sum as a basic damage value. Calculation is carried out based on field real-time data, the actual degradation process under different operation currents, operation frequencies and temperature rise conditions is accurately reflected, and the authenticity of life prediction is improved.

The invention belongs to the technical field of water environment detection, and particularly relates to a heavy metal concentration and water body flow velocity synchronous detection method for a dispersed drain outlet, which is used for synchronously detecting the heavy metal cadmium concentration and the water body flow velocity. The core of the method comprises a three-electrode sensing system consisting of a working electrode coated with a tungsten oxide film, a reference electrode and a counter electrode, and is assisted by an electrochemical workstation, a peristaltic pump, a flow cell and a signal processing module. The cadmium concentration is accurately measured through the square wave anodic stripping voltammetry, the flow velocity is synchronously detected through the open circuit potentiometry, dual-function detection is achieved through integration of the square wave anodic stripping voltammetry and the open circuit potentiometry, synchronous in-situ detection of the cadmium concentration and the water body flow velocity is achieved, and errors caused by measurement position differences are effectively eliminated. The result shows that the cadmium concentration and the dissolution peak current are in a linear relationship, and the water flow velocity logarithm and the open-circuit potential are in a linear relationship. The method designed by the invention is suitable for scattered and small sewage draining exit scenes, and effectively solves the problems of time consumption and equipment redundancy of traditional step-by-step detection. In an actual water sample test, the cadmium recovery rate is 80%-120%, the flow velocity measurement RSD is smaller than or equal to 5.0%, high reproducibility, stability and anti-interference performance are achieved, technical support is provided for real-time online evaluation of the total heavy metal emission amount, and the method has remarkable environmental monitoring application potential.

The invention discloses a multi-source cooperative green electric power energy optimization scheduling system, and relates to the technical field of electric power system computing power scheduling, and the system comprises an interaction construction module which constructs a direct connection signal channel of a supercomputing CPU and an intelligent computing GPU; the impedance matching module monitors a signal transmission reflection coefficient in real time and obtains signal transmission delay to realize impedance compensation; the supercomputing power supply layer configuration module regulates and controls output voltage in real time through a voltage monitoring unit; the intelligent calculation power supply layer configuration module adapts to the instantaneous peak current demand of the intelligent calculation module; the supercomputing water-cooling heat dissipation execution module is used for adjusting the flow of a water-cooling pump after receiving the temperature signal; the intelligent calculation air cooling linkage control module is used for collecting the real-time temperature of the intelligent calculation module and controlling the rotating speed of a speed-adjustable fan according to a fan rotating speed adjusting formula so as to realize pulse type heating adaptive heat dissipation; and the comprehensive evaluation module constructs a comprehensive evaluation model and evaluates the system performance. The problems of high transmission delay, mismatched heat dissipation and unstable power supply are solved.

A transistor control logic circuit has a first and a second input and an output. The output is coupled to the control terminal of a transistor. A peak current detector has a reference input, a detection input, and an output. The peak current detector provides a first signal at its output in a first logic state in response to a detection signal exceeding a reference signal. A trigger buffer has a first and a second input and an output. The first input of the trigger buffer is coupled to the output of the peak current detector. The output of the trigger buffer is coupled to the first input of the transistor control logic circuit.The trigger buffer provides a third signal in the first logic state at the output of the trigger buffer in response to the fact that the first signal at the output of the peak current detector is in the first logic state and a second signal at the second input of the trigger buffer is in a second logic state.

An integrated circuit (100A) includes an H-bridge circuit (102) having a first output node (OUT1) for coupling to the high-side terminal of an inductor (103) and a second output node (OUT2) for coupling to the low-side terminal of the inductor. A current-sensing FET (SNS-DRV) is coupled between a current source (110) and a lower supply voltage to provide a reference current (Itrip), including a peak current limit at the sensing node. A current-sensing comparator (104) has a first input coupled to the sensing node, a second input coupled to the second output node, and an output (113) coupled to send an output signal to a driver control circuit. A FET linearity detection circuit (112) is coupled to receive the gate voltage (LS2) of an active low-side power FET (Mls2) and has an output (CMP EN) coupled to enable the current-sensing comparator when the active low-side power FET operates in the linear region.

The application discloses a high-voltage PTC electric heater electronic function test method, which comprises the following steps: 1, detecting peak current; 2, measuring steady-state current; then calculating standard power; 3, sequentially closing all the sub-regions, and recording the corresponding current when the current is stable after each time of closing the corresponding sub-region; then calculating the steady-state current of each sub-region; 4, detecting no-current data in a normal DC voltage environment; 5, detecting the working current of each sub-region under an ultrahigh DC voltage and comparing with the standard; 6, detecting no-current data 2 in an ultrahigh DC voltage environment, and simultaneously detecting the discharge time S required when the voltage drops to 60V 放电 ; 7, after the test is completed, judging all test items. The application can more stably and accurately measure the standard power and the maximum heating capacity, can guarantee the sub-region current balance of the high-voltage PTC electric heater out of the factory, and through the detection of the ultrahigh DC voltage, can ensure the quality stability of the product.

The invention discloses a current setting method of a display panel, display equipment and a storage medium, and the method comprises the steps: obtaining the brightness information of the display panel in response to a vertical synchronization interrupt signal; wherein the brightness information comprises an average brightness value of the display panel and a brightness difference coefficient between areas on the display panel; according to the average brightness value and / or the brightness difference coefficient in the brightness information, the current value of the display panel is set to be peak current or normal current. According to the mode, the current is set according to the average brightness value of the display panel and the brightness difference coefficient between the areas on the display panel, so that the backlight current is dynamically improved in a low-brightness picture on the premise that the backlight power is not changed, and the displayed picture quality performance is remarkably improved.

The problem to be solved by the present invention is to provide a spot welding spatter detection method that can detect spatter generation without resetting the voltage detection line. To solve the above problem, in the spot welding method, a pulsed waveform welding current is provided to the workpiece by alternately performing the following steps in multiple cycles: a step of maintaining the welding current within a set peak current range; a step of decreasing the welding current from the peak current range towards the bottom current, and then increasing the welding current towards the peak current range when the effective value of the welding current reaches a set target range. In the spatter detection method, the pulse widths IW(1), IW(2), ... of the pulsed waveform in each cycle are measured. If the pulse width difference D(M) = IW(M) - IW(M-1) between the pulse width IW(M) in the target cycle (the Mth cycle) and the pulse width IW(M-1) in the previous cycle exceeds a width threshold Dth, then the generation of spatter is detected.

A switching control unit is applicable to an electric power conversion apparatus. The electric power conversion apparatus includes: a transformer; an inverter circuit including first switching devices; a synchronous rectifying circuit including second switching devices serving as rectifying devices; and a smoothing circuit. The switching control unit includes: a first current detection circuit detecting a peak current value of a secondary current; a second current detection circuit detecting an output current value; and a control circuit controlling respective operations of the first switching devices of the inverter circuit and respective operations of the second switching devices of the synchronous rectifying circuit. The control circuit sets a timing of switching from an on-state to an off-state of each of the second switching devices based on the peak current value detected by the first current detection circuit and the output current value detected by the second current detection circuit.

The invention provides a control circuit applied to a TFT LCD (Thin Film Transistor Liquid Crystal Display) driving chip for reducing Source driving peak current, comprising a group of Source basic driving units which comprise a driving buffer circuit, a polarity exchange control circuit, a positive peak current control circuit, a negative peak current control circuit and two polarity load channels S1 and S2, the driving buffer circuit is composed of a positive voltage buffer and a negative voltage buffer, the input voltage VIPP of the positive voltage buffer is connected with the output of the positive peak current control circuit, and the input voltage VIPN of the negative voltage buffer is connected with the output of the negative peak current control circuit. The input of the positive peak current control circuit is a positive gray-scale voltage VREFP, and the input of the negative peak current control circuit is a negative gray-scale voltage VREFN, the output OUTP of the positive voltage buffer and the output OUTN of the negative and positive voltage buffer are connected with the input end of the polarity exchange circuit. The invention further provides a corresponding control method. The circuit can better reduce peak current, and is low in cost and easy to popularize.

The invention discloses an audio amplification system based on phase reversal double-class-D power amplifier low power stress. The audio amplification system comprises a signal receiving and decoding module, an operational amplifier module, a double-group class-D power amplifier module, a filtering output module and a power supply module for supplying power to each module, which are connected with one another, a first operational amplifier unit in the operational amplifier module is configured to perform in-phase amplification on the analog audio signal; the second operational amplifier unit is configured to perform inverting amplification on the input signal; a first D-type power amplifier unit in a double-group D-type power amplifier module receives an in-phase signal and outputs an in-phase PWM (Pulse Width Modulation) power signal, and a second D-type power amplifier unit receives an inverted signal and outputs an inverted PWM power signal; and the first D-type power amplifier unit and the second D-type power amplifier unit work based on driving signals with opposite phases, so that peak current drawn from the power supply module is staggered or complementary in time to reduce instantaneous current stress and voltage fluctuation of the power supply module. The same audio output power is realized through ingenious signal phase management on the premise that the power supply cost is not increased or even reduced.

The invention discloses a high-power-density driving and energy control integrated electromechanical servo mechanism. Control drive components are integrated into an intelligent microsystem through the SIP stacking technology, high integration and miniaturization of a control driver are achieved, and the problems of heat dissipation and heat conduction are solved by attaching the metal adapter plate to the surface of the shell. The semi-solid lithium ion battery pack is used as an energy part, the appearance of the battery pack is designed according to shell structure matching, and the total envelope size is reduced. Meanwhile, the peak current output capability of the power supply is fused with a motor acceleration control method, and the regenerative electric energy absorption capability of the power supply is fused with a motor deceleration control method; a driver direct current bus input filter capacitor and a power supply output capacitor are fused, power supply output current and voltage detection and driver bus voltage monitoring are fused, and the optimal design of energy control driving comprehensive performance is achieved.

Technologies related to transient response of low dropout regulator (LDO) circuits are described. The LDO circuit has a lower standby output voltage and a greater active output voltage. When transitioning to the greater active output voltage, a wakeup circuit controls peak current between voltage supply and LDO output.

The present application provides a method for monitoring a through fault current. The method may involve: detecting a through fault; calculating an electrical stress, peak current, and duration of the through fault; determining two sets of percentage state changes associated with the through fault; assigning a respective set of weights and criticalities to each set of percentage state changes; calculating a mechanical state change based on the first set of percentage state changes and the first set of weights and criticalities; calculating a thermal state change based on the second set of percentage state changes and the second set of weights and criticalities; calculating a cumulative state change based on the mechanical and thermal state changes; and training a machine learning model using the electrical stress, peak current, duration, two sets of percentage state changes, and mechanical, thermal, and cumulative state changes.

In one embodiment, a semiconductor storage device includes a plurality of memory chips, at least one of the memory chips including a first controller configured to be shifted to a wait state of generating a peak current, before generating the peak current in accordance with a command. The device further includes a control chip including a second controller configured to search a state of the first controller and control, based on a result of searching the state of the first controller, whether or not to issue a cancel instruction for the wait state to the first controller that has been shifted to the wait state.

Aspects of the present invention relate to a control system, to a vehicle, to a method, and to a computer readable medium, for controlling a peak electric current used by an electric power assisted steering system (EPAS) of an electric vehicle. The method comprises obtaining a signal representative of a charge level of a traction battery of the vehicle, determining, based on the obtained signal, a value of a maximum electric current to be used by the EPAS, and providing, to the EPAS, an indication of the value of the maximum electric current to be used by the EPAS.

System which includes the following: a peak current mode controller for controlling the cycle operation of a power switch in a switching power converter for controlling an output voltage to a nominal value, wherein the peak current mode controller includes a comparator (520) to generate a turn-off command in response to a comparison of a multiplied fault signal with a signal (Isense) representing an input current into an AC / DC power converter; an upper threshold voltage (VOUT-limit) matching circuit (530) configured to increase an upper threshold voltage (VOUT-limit) in response to an increase in a voltage ripple between the output voltage and the nominal value, wherein the upper threshold voltage (VOUT-limit) matching circuit (530) is further configured to decrease the upper threshold voltage in response to a decrease in the voltage ripple; a lower threshold voltage (VOUT lower limit) matching circuit (535) configured to decrease a lower threshold voltage (VOUT lower limit) in response to an increase in voltage ripple, wherein the lower threshold voltage (VOUT lower limit) matching circuit (535) is further configured to increase the lower threshold voltage in response to a decrease in voltage ripple; and a mode control circuit (525) configured to allow the comparator (520) to control the cycling of a power switch when an output voltage for the switching power converter is both lower than the upper threshold voltage (VOUT upper limit) and higher than the lower threshold voltage (VOUT lower limit), and to prevent the comparator (520) from controlling the cycling of the power switch when the output voltage is higher than the upper threshold voltage (VOUT upper limit) or lower than the lower threshold voltage (VOUT lower limit).