10561 results about "Voltage reference" patented technology

The invention relates to the technical field of integrated circuit test and calibration, and discloses a chip test and calibration method and a chip tester. The chip test calibration method is applied to a chip test module and specifically comprises the following steps that S101, a starting signal sent by a user terminal is received, environment initialization operation is executed, and after initialization is completed, a system automatically enters a standby mode and waits for an external trigger signal or a user instruction; and S102, synchronously capturing input and output signal waveforms of the tested chip at a preset sampling frequency through a high-precision current sensor and a voltage sampling circuit. Through a dynamic parameter acquisition and real-time compensation technology, a voltage reference error is effectively reduced, the temperature control precision is superior to + / -0.3 DEG C, signal distortion caused by environmental interference is effectively inhibited, a multi-dimensional calibration model is combined with time domain, frequency domain and statistical characteristic analysis, nonlinear errors and system drift can be dynamically corrected, and the system performance is improved. And the attenuation error of a test signal transmission path is lower than 0.02 dB.

The present invention provides an inverter control method, device, computer equipment and storage medium, belonging to the field of power electronics. The method comprises: determining a frequency control equation of the inverter under a grid-connected condition when the inverter is in a VSG control mode; determining a relationship between a virtual electromotive force of a virtual synchronous generator in a reactive state and an output voltage of the inverter; constructing a voltage-current double closed-loop control structure of the inverter under the VSG control mode, and determining a current reference value and a voltage reference value of the virtual synchronous generator under dq axes through the frequency control equation and the relationship; constructing a fuzzy control rule of a virtual damping coefficient and a virtual inertia according to the current reference value and the voltage reference value; and controlling the virtual damping coefficient and the virtual inertia through the fuzzy control rule, thereby improving the stability and performance of the inverter during the grid-connected process, reducing the harmonic disturbance of the power system, and helping to improve the adaptability and reliability of the entire photovoltaic power generation system.

The embodiment of the invention provides a pixel circuit and a display module, and relates to the field of display panels. The pixel circuit comprises a driving module which is electrically connected with a first electrode of a light-emitting element and is used for driving the light-emitting element to emit light; the first end of the shunt branch is electrically connected with the first electrode of the light-emitting element, the second end of the shunt branch is electrically connected with a first reference voltage signal line, and the shunt branch is used for transmitting part of driving current provided by the driving module to the first reference voltage signal line. According to the pixel circuit and the display module provided by the embodiment of the invention, the problem that the display brightness of a display panel is not uniform can be fully improved, so that the display effect and the use performance of the display panel are effectively improved.

An interface circuit includes a reference voltage generation circuit to generate a reference voltage, a differential voltage signal generation circuit to convert send data input in sending data into a pair of differential voltage signals and output the pair of differential voltage signals based on the reference voltage generated by the reference voltage generation circuit, a receiver to convert a pair of differential voltage signals input in receiving data and output received data, and a receiver test circuit to perform a sensitivity test of the receiver, the receiver test circuit having a resistance circuit to generate a pair of differential voltage signals having a potential difference being necessary for the sensitivity test of the receiver.

The present application relates to a virtual synchronous control method and apparatus for an energy storage system, a device, and a storage medium. The method comprises: controlling an output voltage of a direct-current energy storage valve on the basis of an output electrical signal measurement value of a direct-current side of a voltage source converter and an output voltage reference value of the direct-current energy storage valve; further, controlling an output signal of an alternating-current side of the voltage source converter on the basis of a grid connection point electrical signal measurement value and a grid connection point electrical signal reference value of the voltage source converter. It can thus be seen that the embodiments of the present application implement a virtual synchronous control method independently controlling a voltage source converter and a direct-current energy storage valve in an energy storage system, so that the method can be applied to virtual synchronous control of a high-voltage direct-current direct-mounted energy storage system. In addition, by means of independently controlling the voltage source converter and the direct-current energy storage valve in the energy storage system, the voltage source converter does not need to be configured to take into account both direct-current side control and alternating-current side control, so that the complexity of a control loop of the voltage source converter can be simplified.

Technology for reading memory cells in three-dimensional memory having multiple tiers. The memory system erases the tiers within each block independently. Then, memory cells in the tiers are programmed by units such as word lines. The memory system determines one or more read parameters for the selected tier based on the programmed / erased states of the other tiers in the block. For example, the memory system may select read reference levels for the selected tier based on the programmed / erased states of the other tiers. In an aspect, the one or more read parameters are used to determine the set of reference voltages for a bit error rate estimation scan (BES).

The invention provides a server voltage monitoring system and method, electronic equipment and a storage medium, and relates to the technical field of computers, the system comprises a complex programmable logic device CPLD, and an initial timing module, a voltage acquisition module, an abnormal data storage module, a CPU processor and a baseboard management controller BMC module which are respectively in communication connection with the CPLD. The initial timing module activates the monitoring function of the CPLD through a startup signal; the voltage acquisition module acquires voltage data under the control of the CPLD so as to read the voltage data of the server mainboard; the CPLD obtains voltage data, compares the voltage data with a reference voltage range of the abnormal data storage module, triggers an interrupt signal after identifying abnormal fluctuation voltage, and feeds back the interrupt signal to the CPU and the BMC, so that the CPU and the BMC quickly output an alarm. The system covers full-cycle monitoring from startup to BMC startup, supports efficient acquisition, dynamic detection and low-delay response of multi-path voltage, relieves the voltage pressure of a BMC monitoring mainboard, and provides reliable guarantee for power supply safety of a server.

The invention is suitable for the technical field of electric power, and provides a current-limiting control method and device for a network construction type energy storage converter, and the method comprises the steps: generating the virtual internal potential of the network construction type energy storage converter according to the operation parameters of a power grid; when the power grid breaks down, whether the output current of the grid-forming type energy storage converter exceeds a current rated value or not is judged, and self-adaptive virtual resistance and self-adaptive virtual impedance are determined according to the judgment result and the virtual internal potential; wherein if the output current of the grid-forming type energy storage converter exceeds the current rated value, the fault transient current is limited according to the self-adaptive virtual resistance in the first three power frequency periods of the beginning of the fault, and the fault steady-state current is limited and the power angle curve is remodeled to improve the power angle stability in the later fault time according to the self-adaptive virtual resistance; and calculating a current reference value of the power grid and a voltage reference value of a grid-connected point according to the self-adaptive virtual impedance, and performing switching control on the grid-forming type energy storage converter. According to the invention, safe and stable operation of the network-forming type energy storage converter can be ensured.

The invention provides a frequency converter dynamic fault diagnosis method and system based on a multi-brand load test platform. According to the method, multiple real-time operation parameter sets are acquired, the amplitude attenuation threshold and the frequency fluctuation interval of a voltage waveform fragment are dynamically adjusted according to a load mode configuration file, the dynamic voltage reference parameter corresponding to the current load mode is generated, and then the actual waveform and an expected current phase curve are compared frame by frame; the method comprises the following steps: firstly, calculating to obtain a phase offset, then constructing a multi-dimensional operation characteristic spectrum, then carrying out time sequence cross validation on a sudden change time node of a power factor jump trajectory and an abnormal waveform position in a harmonic distortion incidence matrix, outputting an abnormal mode code, and finally, matching a load adaptation grade constraint condition to generate a diagnosis report; according to the technical scheme provided by the invention, the fault diagnosis precision and the cross-brand system adaptation capability in a complex load scene are remarkably improved, and the problem of misjudgment of a single brand threshold rule in a multi-device scene is effectively solved.

The present invention discloses a method for diagnosing micro-short circuit fault of a battery, comprising: acquiring real-time voltage data of each battery in battery module of electric vehicle, obtaining voltage matrix after noise elimination; calculating dynamic reference voltage sequence of the each battery in the voltage matrix within sliding window length, extracting eigenvalues of the each battery at different times; calculating correlation coefficients between voltages of the each battery at different times and reference voltage within the sliding window; forming feature point matrix of the battery module based on the eigenvalues and the correlation coefficients; calculating dynamic reference feature point sequence based on the feature point matrix, and calculating improved Frechet distances between feature point sequences of the each battery and the dynamic reference feature point sequence, using Frechet distance values as anomaly scores of the each battery; thus, judging whether a short-circuit fault occurs in the each battery.

The invention relates to the technical field of resonance suppression, and discloses an active damping control LC resonance suppression method and device. The method comprises the following steps: performing parameter identification processing based on bus voltage to obtain an inductance value, a capacitance value and a resonance frequency of an LC circuit; extracting a resonant current component of the current signal based on the resonant frequency; calculating damping power according to the resonance current component, and converting the damping power into a voltage compensation instruction under an alpha-beta coordinate system; generating a PWM control signal according to the voltage compensation instruction and a voltage reference instruction; and performing on-off control on the inverter based on the PWM control signal, and injecting power opposite to the resonant current component into the LC circuit to generate a virtual damping effect. Virtual impedance characteristics are seamlessly integrated into inverter control, rapid response of the whole process from resonance detection to power injection is ensured, the resonance peak value is effectively suppressed, and the current quality is improved.

The invention provides a display panel, a driving method thereof, a driving circuit and a display device.The display panel comprises a plurality of scanning lines, a plurality of data lines and pixel units arranged in an array mode, and each pixel unit comprises a pixel electrode, a storage capacitor, a first transistor, a comparison circuit and a switch logic circuit; the comparison circuit compares a signal input by a data line with a first reference voltage and outputs a comparison signal corresponding to high and low levels, and the switch logic circuit performs logic judgment and corresponding on-off on the level of the signal input by the scanning line and the comparison signal, so that the line scanning signal and the data signal are input to the first transistor; the data lines and the scanning lines are connected to control whether data signals of the pixel electrodes and the storage capacitors are written and refreshed or not, the pixel units can be controlled to maintain a current picture and switch a display picture by inputting data signals and line scanning signals of different sizes to the data lines and the scanning lines, independent control over the single pixel unit can be achieved, and the display requirements of different refresh rates are met.

The invention discloses a power supply starting control circuit, a power supply starting control method and electronic equipment. The power supply starting control circuit comprises a first electric energy conversion circuit, a resonance circuit, a second electric energy conversion circuit and a main control circuit, the main control circuit is configured to obtain a resonance current signal and a power supply output signal in a second start-up stage, so that the resonance current signal is generated when the power supply output signal is not greater than the target reference voltage. Performing slope compensation on an adjustment output signal obtained by using a difference value between the power supply output signal and the target reference voltage by using the first slope compensation slope to obtain a first feedback adjustment signal, and generating a second control signal by using the first feedback adjustment signal and the resonant current signal; the target reference voltage is linearly increased in the second starting stage; the first electric energy conversion circuit receives the first control signal and the second control signal and adjusts the converted and output first alternating current signal by using the first control signal and the second control signal in sequence. By means of the mode, the power supply starting control circuit can effectively achieve smooth starting control.

An electrical power distribution system is disclosed. A line converter is connectable to a mains power source and an on-board battery. An electronic control system is configured to control the line converter. A first sensor arrangement is configured to measure electric current into or out of the battery. A second sensor arrangement is configured to determine a current battery voltage. The electronic control system is arranged to receive a charge / discharge power request and control the line converter to regulate the line converter output voltage using a voltage reference obtained from a setpoint electric current into or out of the battery and the measured electric current into or out of the battery, where the setpoint electric current into or out of the battery is derived as a quota of the charge / discharge power request and the determined current battery voltage.

The invention provides a COT step-down converter comprising an inductive current detection circuit configured to detect an inductive current flowing through an inductor connected to a system output of an output voltage of an output system of the COT step-down converter, and generate a current zero-crossing detection signal indicating whether the inductive current crosses zero, the inductive current zero-crossing means that the inductive current is changed from positive current to negative current; and a sleep mode control circuit configured to generate a sleep mode control signal for controlling one or more circuit modules in the COT buck converter to change from an operating state to a closed state based on the current zero-crossing detection signal, an output feedback voltage representing a system output voltage of the COT buck converter, and a predetermined reference voltage.

The invention discloses an inverter control method, device and system based on a neural network predictor, and the method comprises the steps: building an over-limit equation according to the three-phase network side voltage and three-phase network side current of an inverter, and determining a current function according to the over-limit equation; predicting the current function based on a neural network predictor to obtain a reference voltage vector corresponding to the current function; establishing an evaluation function about the three-phase network side current, determining the position of a reference voltage vector in the voltage vector subarea, traversing a plurality of to-be-selected voltage vectors in the voltage vector subarea where the reference voltage vector is located, and obtaining the reference voltage vector when the evaluation function is at the minimum value as a candidate item; and traversing all the control inputs of the inverter, obtaining the control input when the evaluation function is at the minimum value, taking the control input as the optimal selection for controlling the inverter, and adjusting the switch of the inverter. The robustness of the system can be improved while the excellent dynamic performance of the system is maintained.

Described embodiments include a control circuit with a first comparator having a first comparator input receiving a first threshold voltage, and a second comparator input coupled to an output voltage terminal. A second comparator has a third comparator input receiving a second threshold voltage, and a fourth comparator input coupled to a current output terminal. A first logic circuit provides a true signal at its output responsive to a particular number of its inputs receiving a true input. A second logic circuit has inputs coupled to the first comparator output, and to the first logic output. A variable resistance circuit has an output coupled to a mode detection output. An amplifier has inputs coupled to the variable resistance circuit output, and a third reference voltage source. A duty cycle generation circuit provides a respective pulse width modulation (PWM) signal at each of its respective duty cycle outputs.

An integrated circuit device includes: one or more switches of a Buck converter; and a control circuit for the Buck converter, including: a comparator configured to compare a feedback voltage of the Buck converter with a compensation ramp voltage; a pulse generator configured to generate, in response to a rising edge in a comparator output signal, a pulse signal for controlling the Buck converter; a transconductance amplifier (TA) configured to generate, at an output terminal of the TA, a current proportional to a difference between a reference voltage and the feedback voltage; a capacitor coupled between an output terminal of the TA and a reference voltage node; and a ramp signal generator configured to generate the compensation ramp voltage by adding a voltage at the output terminal of the TA and a ramp voltage having a gradient proportional to a switching frequency of the Buck converter.

An electrical circuit includes positive and negative voltage rails, a reference voltage rail, a non-trimmable bandgap core configured to output a voltage reference on the reference voltage rail, and a trimming element in an auxiliary section located external to the bandgap core. A current source is coupled to the non-trimmable bandgap core and the positive voltage rail. An auxiliary diode arranged in an auxiliary section outside of the bandgap core is coupled to the current source and negative voltage rail. The trimming element is coupled to the current source external to the non-trimmable bandgap core and has an adjustable set point. The adjustable set point is adjusted to inject a corresponding bias current to the auxiliary section during a trimming process and thereby change the voltage reference.

A memory device and a method of operating the memory device include setting a read voltage to be applied to a selected word line among word lines connected to a memory block and setting a first pass voltage to be applied to an adjacent word line adjacent to the selected word line among the word lines. The method also includes applying the first pass voltage to the adjacent word line and applying the read voltage to the selected word line. The first pass voltage is set higher than a reference pass voltage when the read voltage is lower than a reference voltage. The first pass voltage is set lower than the reference pass voltage when the read voltage is higher than the reference voltage.

The invention belongs to the technical field of motor control, and relates to a permanent magnet synchronous motor sensorless control method, system and hardware circuit, angular velocity estimation is designed based on a q-axis current model under a two-phase rotating coordinate system, angular velocity estimation compensation is designed based on a d-axis current model, and a rotating speed correction coefficient is introduced. And dynamic compensation of the estimated angular velocity value is realized. An accurate angular velocity estimated value and an accurate rotor angle estimated value are obtained by constructing a Romberg observer with an angular velocity estimated value and a rotor angle estimated value as outputs based on a dq rotating coordinate system. Taking an angular velocity error obtained by a motor angular velocity given value and a motor angular velocity estimated value as input of an outer ring PI controller, so as to ensure that the angular velocity estimated value tracks the motor angular velocity given value and output a q-axis current reference value; taking the difference value between the q-axis current reference value and the q-axis current sampling value and the difference value between the d-axis current reference value and the d-axis current sampling value as the input of an inner ring PI controller so as to ensure the bandwidth and the influence capability on the load, and outputting a d-axis voltage reference value and a q-axis voltage reference value; and converting the d-axis voltage reference value and the q-axis voltage reference value into voltage reference values under a two-phase static coordinate system based on the rotor angle estimation value so as to divide SVPWM drive circuit sectors, select voltage vectors, calculate action time, control on and off time of a permanent magnet synchronous motor switching device, and control on-off time of the permanent magnet synchronous motor switching device. And the alternating current speed regulation performance of the permanent magnet synchronous motor without the position sensor under the Romberg observer method is ensured.

The invention relates to the technical field of parallel connection of energy storage inverters, in particular to a synchronous control method of an energy storage inverter system supporting multi-machine parallel connection, which comprises the following steps of: according to a preset rule, assigning one inverter as a master node and the other inverters as slave nodes; when it is detected that the running state of the main node exceeds a preset abnormal threshold value, a main control switching process is triggered; dynamically electing a new host strategy based on a preset priority, and dynamically electing an inverter as a new host node; the other inverters synchronously switch the tracking target and update the synchronization reference; in the switching process, the new main node smoothly establishes a voltage reference by adopting a phase pre-synchronization and slope transition strategy. According to the invention, by introducing a dynamic master node switching mechanism, when the master node is abnormal, the master control responsibility is automatically, quickly and smoothly transferred to the healthy slave node, the AC side voltage frequency synchronization and the DC side bus voltage stability are maintained, and the continuous and stable operation of the multi-machine parallel system under the condition of the master node fault is ensured.

The invention discloses an adaptive virtual inertia control method for an inverter based on an Andronov-Hopf oscillator, and relates to the technical field of network-forming inverter control. The invention aims to solve the problem that the stability and reliability of a power system can be damaged by control based on an oscillator. According to the invention, the difference between the output current of the inverter and the reference current is obtained, and the difference passes through an inertia link to obtain an input current error signal of the oscillator; the difference between the active power reference value and the actual value of the inverter is obtained, and the difference is subjected to active-frequency control with self-adaptive virtual inertia to obtain the angular frequency of the oscillator; the reactive power reference value and the actual value of the inverter are subtracted, and the difference value is subjected to reactive-voltage control with a PI controller to obtain the voltage amplitude of an oscillator; the voltage generated by the Andronov-Hopf oscillator is calculated through the Andronov-Hopf oscillator, the voltage passes through the integrator to obtain SVPWM reference voltage, the three-phase voltage source inverter is modulated, and grid-connected control is achieved.

The invention belongs to the field of circuits, and provides a direct current conversion circuit for enhancing transient response, a switching power supply and electronic equipment. The circuit comprises a conversion module, a comparison module, a ripple injection module, a time delay module, a driving module, a reset module and a switch module, the comparison module is connected with the conversion module, the time delay module, the ripple injection module, the switch module and a load, and the driving module is connected with the conversion module, the time delay module and the reset module. The time delay module is connected with the switch module and the reset module. When the feedback voltage is smaller than the reference voltage, namely before the upper tube is switched on each time, the switch module is controlled to be switched on, so that the first ripple signal and the second ripple signal are connected, the two ripple signals input to the comparison module do not have too large influence on loop control, and therefore in the process that the load jumps from light load to heavy load, the loop control is not influenced. Therefore, the suppression effect of injection ripples on the conduction of the upper tube can be weakened, the drop of the output voltage can be reduced, and the transient response of the circuit can be enhanced.

The invention belongs to the field of power electronic power conversion, and provides a coupling type three-level inverter direct current side capacitance current ripple suppression method and system, and the method comprises the steps: determining a coupling type three-level inverter space vector diagram region division method according to a virtual voltage vector duty ratio distribution factor value range; according to the amplitude, the phase angle and the three-phase output current of the reference voltage vector, the sector and the area where the reference voltage vector is located are judged; according to the sector and the area where the reference voltage vector is located, selecting a virtual voltage vector and two basic voltage vectors which are closest to each other, and respectively calculating duty ratios of the virtual voltage vector and the two basic voltage vectors; designing a controller based on a dead-beat control method according to a sector and an area where a reference voltage vector is located, a direct-current side capacitor voltage deviation given value and a direct-current side capacitor voltage deviation actual value, and updating a small vector duty ratio distribution factor to realize independent control of capacitor voltage; and designing a switch sequence based on the updated small vector duty ratio and the sector and the area where the reference voltage vector is located.

The invention relates to the technical field of semiconductor laser power supplies, in particular to a semiconductor laser power supply control circuit based on linear constant current and a method thereof. According to the technical scheme, the circuit comprises a voltage follower module, a linear constant-current driving module, a power switch module, a pulse control module, a sampling feedback module and a follow current protection unit. The in-phase input end of an operational amplifier OPA320 of the voltage follower module is connected with external reference voltage # imgabs0 #, the inverted input end of the operational amplifier OPA320 is grounded through a first resistor R1 and connected with the output end through a second resistor R2, and a filter capacitor C1 is connected to the two ends of the second resistor R2 in parallel. Through a linear constant current control and pulse cooperation mechanism, the current stability and the dynamic response speed of the semiconductor laser under the wide-range and high-frequency working condition are remarkably improved, and it is guaranteed that the laser output power is accurate and reliable.

A control module adapted to be attached to a power adapter is described. The control module comprises a plurality of contact elements including a first contact element adapted to receive a line voltage and a second contact element adapted to receive a reference voltage; a first actuator extending from a housing of the control module and adapted to engage with a connector of a power adapter; a second actuator extending from the housing of the control module and adapted to engage with a tamper resistance element of a power adapter; a control circuit adapted to generate a signal; and a third contact element coupled to the control circuit; wherein the control circuit generates to the signal adapted to be routed to the power adapter by way of the third contact element to detect a change in a state of a switch of a power adapter.

According to the SiC MOSFET global short circuit and overcurrent protection circuit and the control method thereof provided by the invention, when a short circuit fault occurs in the SiC MOSFET, the drain current ID is more than several times of the rated current of the SiC MOSFET. When a short circuit occurs, a transistor QDZ of the short circuit detection circuit is switched on by node voltage Vr of the resistance-capacitance filter circuit, a fault signal VFAULT is converted into a low level, grid voltage VGS output by the grid control unit is gradually converted into zero voltage from negative driving voltage VEE, and soft turn-off is performed on the SiC MOSFET; when an over-current fault occurs in the SiC MOSFET, drain current ID is higher than rated current, node voltage Vo of the resistance-capacitance filter circuit lasts for a long time, the maximum value of capacitor voltage Vch of the over-current detection circuit is higher than reference voltage Vref2, a fault signal VFAULT is converted into low level, grid voltage VGS output by the grid control unit is gradually converted into zero voltage from negative driving voltage VEE, and soft turn-off is performed on the SiC MOSFET. According to the invention, high-speed short circuit and over-current fault protection of the SiC MOSFET in all inductance regions of a commutation loop can be realized.

A linear voltage regulator includes a converter circuit that provides a serial bitstream having a pulse density that is indicative of a difference between a regulated voltage of the linear voltage regulator and a reference voltage. The linear voltage regulator also includes a digital to analog converter circuit that includes an input to receive the serial bitstream. The digital to analog converter circuit includes an averager circuit that produces an output signal to control a voltage of a control terminal of a power transistor of the linear voltage regulator for regulating the regulated voltage based on the pulse density of the serial bitstream.

An SAR ADC includes: at least one sub-ADC, configured to convert a corresponding input signal to a corresponding SAR code; and a tuning control unit, configured to adjust a full-scale voltage (VFS) of each of the sub-ADC to a corresponding predetermined target level in a VFS tuning mode. The tuning control unit generates a tuning code to control an adjusting capacitor array coupled to the sub-ADC for tuning the VFS. The tuning control unit controls the sub-ADC to convert plural reference voltages in the VFS tuning mode and extrapolating the conversion result to determine a corresponding calibrating VFS. The tuning control unit determines whether the calibrating VFS meeting the target VFS and loops the adjusting process in a linear search method or in a SAR method.