443 results about "Voltage controller" patented technology

The invention discloses a control method and system for improving SVG (Static Var Generator) disturbance signal generation precision, relates to the technical field of SVG disturbance signal generation, and solves the technical problem that a current disturbance signal generated by an SVG is difficult to meet the dynamic precision requirement required by multi-frequency impedance measurement. According to the technical scheme, disturbance signal attenuation caused by SVG direct-current voltage control is calculated through an observer, after phase compensation, the disturbance signal attenuation and a direct-current voltage given value are superposed to serve as outer loop input of a voltage controller, and the outer loop input is subtracted from direct-current voltage feedback; an outer ring output is obtained through a voltage controller of an outer ring and superposed with an instruction current disturbance signal to serve as an inner ring input of a current controller, and SVG operation is controlled through a current inner ring controller and a PWM modulation instruction. The influence of a direct-current voltage outer loop on actual current disturbance signals is remarkably reduced, and the SVG can still output accurate actual current disturbance signals when instruction current disturbance signals of all frequencies are injected into the SVG.

This application relates to methods and apparatus for switched mode drivers. A BTL driver has a switch network operable in different switch states, wherein, in each switch state, each of first and second output nodes is connected to a respective one of a first switching voltage, a second switching voltage or an intermediate switching voltage between the first and second switching voltages which is provided by a driver capacitance. A controller is configured to control the switch network to operate in a sequence of switch states to generate a differential drive signal based on an input signal. The controller is configured such that operation of driver switch network in said sequence of switch states to generate said differential drive signal provides voltage regulation of the intermediate voltage provided by said driver capacitance.

The invention discloses an integrated circuit source measurement unit control method for improving a raccoon algorithm and optimizing fuzzy PID. The method comprises the steps that an output voltage control system of an SMU is set up; acquiring output end voltage data of the SMU system in real time; calculating a voltage error and a voltage error change rate; a fuzzy inference rule base is constructed, fuzzy controller parameters are dynamically adjusted based on the fuzzy rule base according to the voltage deviation value and the voltage error change rate, and then PID parameters are dynamically adjusted; a control signal is generated according to the set PID parameter, and the output voltage of the SMU is adjusted; and S4, optimizing the fuzzy PID voltage controller obtained in the step S4 by adopting an improved raccoon algorithm, selecting a decision variable as a parameter of a fuzzy controller, and assigning the optimized parameter to the fuzzy PID voltage controller to realize control on the output voltage of the SMU. According to the invention, the improved raccoon optimization algorithm and the fuzzy PID controller are combined and applied to the integrated circuit source measurement unit, so that the control performance of the SMU system is improved.

A DC / DC converter includes a converter stage to receive an input voltage and to provide an output voltage from the input voltage in accordance with a modulated drive signal. The converter stage further provides a feedback voltage representing the output voltage. A controller circuit includes an error amplifier to receive the feedback voltage and a reference voltage and to provide an error signal based on the feedback voltage and the reference voltage. A PWM modulator receives a clock signal and the error signal and generates a modulated signal based on the clock signal and the error signal, and a logic circuit receives the modulated signal and generates the drive signal for the converter stage based on the modulated signal so that the drive signal has the same duty cycle as the modulated signal, when the duty cycle of the modulated signal is not smaller than a minimum duty cycle value.

The invention discloses an island micro-grid voltage frequency control method and system based on deep reinforcement learning, and the method comprises the steps: S1, building a mathematical model of a distributed power supply grid-connected inverter in an island micro-grid, employing droop control as an inverter control strategy, and building a voltage and current double-closed-loop model based on droop control; s2, designing a secondary voltage controller based on a deep Q network algorithm based on the mathematical model established in S1; s3, designing a secondary frequency controller based on a DQN algorithm based on the mathematical model established in S1 and the secondary voltage controller in S2; and S4, establishing an island micro-grid model containing multi-distributed power supply access, and embedding the voltage controller and the frequency controller trained in the S2 and the S3 into the island micro-grid for online application so as to realize voltage and frequency control of the island micro-grid. The method has the advantages of eliminating voltage and frequency deviation and the like.

The utility model discloses a flexible charging control system, and relates to the technical field of charging control. The flexible charging control system is arranged in a charging pile, and comprises a switch assembly which is connected between a power grid and a load to be charged and comprises a plurality of phase line change-over switches; the voltage sampling circuit is connected with the output end of the switch assembly and used for detecting the output voltage of the power grid; the controller is used for sending out a control signal of the phase line change-over switch; the logic self-locking circuit is used for outputting a charging control signal when it is detected that the power grid does not output voltage and it is detected that only one of the control signals, sent by the controller, of the phase line change-over switch is effective; and the switch driving circuit is used for controlling the phase line change-over switch to be closed when the control signal and the charging control signal of only one phase line change-over switch are received, so that only one phase line is connected with a load in the same charging period. According to the system, the safety and reliability of the charging control system can be effectively improved, and the complexity of system installation is reduced.

This application relates to methods and apparatus for switched mode drivers. A BTL driver has a switch network operable in different switch states, wherein, in each switch state, each of first and second output nodes is connected to a respective one of a first switching voltage, a second switching voltage or an intermediate switching voltage between the first and second switching voltages which is provided by a driver capacitance. A controller is configured to control the switch network to operate in a sequence of switch states to generate a differential drive signal based on an input signal. The controller is configured such that operation of driver switch network in said sequence of switch states to generate said differential drive signal provides voltage regulation of the intermediate voltage provided by said driver capacitance.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The present invention provides a grid simulator and a test device for the stability test of a grid-connected converter. Among them: The voltage-controlled converter uses a virtual impedance controller and a voltage controller to achieve the port voltage characteristics of the simulated grid, and the voltage-controlled converter has a relatively high switching frequency; the current-controlled converter uses a transient current controller and a current controller to absorb or generate the port load current of the simulated grid, and the current-controlled converter has a relatively low switching frequency; the AC sides of the two converters are connected in parallel and directly connected to the port of the simulated grid, or connected to the port of the simulated grid through a resistor-impedance network. The virtual impedance controller eliminates the differential operator through the Norton equivalent circuit and accurately reproduces the port impedance characteristics of the grid. The present invention can effectively simulate and shape the grid impedance characteristics in a wide frequency band, so as to conveniently realize the stability test of the grid-connected inverter under different grid impedance conditions.

The invention discloses an electric steering pump integrated with a high-low pressure controller for a new energy vehicle, a system and a redundancy control method. The electric steering pump comprises a double-winding motor, a hydraulic steering pump, the high-pressure controller, the low-pressure controller, a sensor and a power actuator. A high-voltage winding and a low-voltage winding are integrated in the double-winding motor; the double-winding motor is connected with the hydraulic steering pump, the high-voltage controller is connected with the high-voltage winding, the low-voltage controller is connected with the low-voltage winding, and compared with the prior art, triple criteria of voltage deviation, current change rate and temperature are fused, so that the fault false alarm rate is effectively reduced; and a torque smoothing algorithm based on an S-shaped transition curve is adopted, so that dual-mode seamless switching control is realized, and the response efficiency is improved.

The invention relates to a fuel cell thermal management system for a heavy-load change working condition, and belongs to the technical field of fuel cells. According to the system, a galvanic pile unit comprises a galvanic pile cooling path inlet temperature sensor, a galvanic pile cooling path outlet temperature sensor, a current output sensor and a voltage output sensor which are used for collecting galvanic pile cooling path inlet and outlet temperature and output current and voltage respectively; the controller is used for presetting the target temperature of the cooling liquid at the outlet of the electric pile and calculating the opening value of the electronic thermostat through a cascade internal model control algorithm in combination with the inlet and outlet temperatures so as to control the opening of the electronic thermostat; an optimal working temperature threshold value is preset, outlet temperature grades are divided, and a heat dissipation unit is controlled according to the outlet temperature grades; working current is preset, the required cooling liquid flow is calculated through a measuring and calculating model in combination with output voltage and inlet and outlet temperatures, rotating speed data is calculated according to the flow-efficiency-rotating speed characteristics of the electronic centrifugal pump, rotating speed grades are divided, and operation of the electronic centrifugal pump is controlled; and controlling the PTC heater to start and stop according to the target and outlet temperature judgment result. And efficient fuel cell thermal management control is realized.

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.

A driving circuit for a power transistor is proposed and includes a gate driving circuit, a controlling circuit and the power transistor. The gate driving circuit outputs a driving voltage signal and a pulse width modulation signal. The controlling circuit is coupled to the gate driving circuit and includes a voltage controller, a first transistor and a second transistor. The voltage controller outputs a controlling signal. The first transistor is turned on or off according to the pulse width modulation signal. The second transistor is turned on or off according to the pulse width modulation signal and the controlling signal. The power transistor coupled to the gate driving circuit and the controlling circuit is controlled by the driving voltage signal. When the first transistor is turned on or the first transistor and the second transistor are turned on, the driving voltage signal is pulled to a target voltage level.

The invention relates to an expandable distributed voltage controller, and relates to the technical field of power grid electric energy management, the expandable distributed voltage controller comprises a series-parallel module comprising a parallel converter, a first series converter, a first DC capacitor and an isolation transformer, the DC side of the parallel converter is connected with the DC side of the first series converter through the first DC capacitor, and the DC side of the first series converter is connected with the isolation transformer through the isolation transformer; the alternating current side of the series converter is connected in series to the power grid side through the isolation transformer; and the series connection module comprises a second series connection converter, a second direct current capacitor and an isolation transformer, the second direct current capacitor is arranged on the direct current side of the second series connection converter, and the second series connection converter is connected to the load and / or the grid connection position in series through the isolation transformer. A plurality of problems can be solved while the power quality problem of the power grid is governed, so that the application range is wider.

The invention discloses a microgrid distributed secondary voltage control method and system based on voltage constraint, and relates to the technical field of microgrid control. The method comprises the following steps: establishing a secondary voltage control model of the distributed generator; designing an event trigger function according to the continuous voltage amplitude information of the generator, and determining a corresponding event trigger mechanism; designing a voltage constraint projection scheme, performing load rate adaptive constraint on the voltage amplitude by considering the dynamic change of the load rate, and projecting the voltage amplitude of the distributed generator into a voltage constraint range by adopting a constraint projection function; and designing a distributed secondary voltage controller based on the voltage constraint projection scheme, and performing secondary voltage control on the micro-grid. Through a dynamic event triggering mechanism and a distributed cooperative control strategy and in combination with a constraint voltage projection technology, the bus voltage is quickly recovered to a reference value under a constraint condition, and the communication frequency is remarkably reduced.

The invention provides a mineral composition online detection system, method and device, and the system comprises an energy spectrum collection subsystem which comprises an X-ray tube, a high-voltage controller and an energy spectrum detector; the high-voltage controller controls the X-ray tube to emit X-rays to the to-be-detected mineral; when the energy spectrum detector obtains a trigger signal that the to-be-detected mineral reaches the detection position, spectrum data of the to-be-detected mineral is collected, and an initial energy spectrum signal of the to-be-detected mineral is obtained; the information acquisition subsystem comprises a laser ranging device; the laser ranging device determines morphology information of the surface of the to-be-detected mineral; and the data processing subsystem corrects the initial energy spectrum signal based on the morphology information to obtain a target energy spectrum signal. According to the scheme of the invention, the interference information of the initial energy spectrum signal is eliminated, and an accurate substance composition result is obtained.

The invention discloses a control method for power adaptive virtual impedance oscillation suppression of a cascaded dynamic voltage restorer, and relates to the technical field of power electronics. According to an instruction that a superior system outputs a three-phase voltage to the dynamic voltage restorer, a corresponding current instruction signal is obtained according to a voltage controller and coordinate transformation, and a direct-current bus oscillation component of a load converter parallel input virtual impedance in the equivalent cascade type dynamic voltage restorer is superposed to serve as a reference input signal of the current controller; therefore, the low-frequency-band negative real number input impedance of the load converter is weakened. Compared with the prior art, the input impedance can be adaptively adjusted according to the load power, the small signal stability of the cascade type dynamic voltage restorer under the condition that the load power changes is greatly improved, the influence of virtual impedance on the dynamic performance of the load converter can be avoided, the response speed to the load change is improved, and the stability of the load converter is improved. And meanwhile, the controller is low in order, few in control parameters and easy to digitally control.

An analog-to-digital converting device includes a capacitive digital-to-analog converter, a comparator, and a controller. The capacitive digital-to-analog converter respectively generates a first and a second sample voltage according to a non-inverting output voltage and an inverting output voltage of a programmable gain amplifier during a sample period. The comparator generates a comparing signal by comparing the first and the second sample voltages during a converting period. The controller controls the capacitive digital-to-analog converter to generate a converting voltage according to the comparing signal during the converting period. The controller controls the capacitive digital-to-analog converter such that the capacitive digital-to-analog converter is pre-charged to a pre-charge voltage during a pre-charge period. The pre-charge voltage is between a maximum value and a minimum value of the non-inverting output voltage and the inverting output voltage of the programmable gain amplifier.

An analog neuromorphic circuit is disclosed having a first and a second memristor crossbar configuration implemented into an autoencoder. The first memristor crossbar configuration includes resistive memories that provide resistance values to each corresponding input voltage applied to the first memristor crossbar configuration to generate first output voltages that are compressed from the input voltages. The second memristor crossbar includes resistive memories that provide resistance values to each corresponding first output voltage applied to the second memristor crossbar configuration to generate second output voltages that are decompressed from the first output voltages. A controller compares the second output voltages to the input voltages to determine if the second output voltages are within a threshold of the input voltages. The controller generates an alert when the second output voltages exceed the threshold from the input voltages thereby indicating that input data associated with the input voltages has not been previously identified.

A dual tank LC-tuned Voltage Controller Oscillator (LC VCO) comprising a differential pair of cross-coupled transistors (M1, M2, M3, M4) produces a negative impedance by keeping a lower drain swing and a sufficient gate swing. The gate terminals of first and second transistors M1, M2 and third and fourth transistors M3, M4 are separated through a series of two inductors L1, L2 and two cross-coupled capacitors are connected between the drain and gate terminals of cross-coupled transistors to attenuate the output swing. The VCO tank further comprises two R2R Digital to Analog Converters (DAC) to bias both NMOS and PMOS cross-coupled pairs of transistors, to produce a common mode noise.

A grid forming converter (32), is arranged to provide a single-phase or multi-phase converter current. Its control comprises: - a grid forming controller (33) determining (101) a voltage reference value (formula (I)); - a voltage controller (34) determining (102) a current reference value î; - a current limiter (35) determining (103), from the current reference value î, a limited current reference value (formula (II)); - a current controller (36) controlling (104) the converter (32) to provide the converter current i prescribed by the limited current reference value (formula (II)). Therein, at least while a fault condition is present, the voltage controller (34) generates a current reference î based on a relationship between a representative (formula (III)) of a virtual internal voltage (formula (IV)) and a representative (formula (III)) of an actual voltage value ν, the phase angle of the virtual internal voltage (formula (IV)) is controlled to match with the phase angle reference of the voltage reference (formula (I)) and the magnitude of the virtual internal voltage (formula (IV)) is adaptively changed depending on overcurrent conditions.

A grid forming converter (32), is arranged to provide a single-phase or multi-phase converter current. Its control comprises: • a grid forming controller (33) determining (101) a voltage reference value v̂; • a voltage controller (34) determining (102) a current reference value î; • a current limiter (35) determining (103), from the current reference value î, a limited current reference value ; • a current controller (36) controlling (104) the converter (32) to provide the converter current i prescribed by the limited current reference value . Therein, at least while a fault condition is present, the voltage controller (34) generates a current reference î based on a relationship between a representative v̂rep of a virtual internal voltage v̂vir and a representative vrep of an actual voltage value v, the phase angle of the virtual internal voltage v̂vir is controlled to match with the phase angle reference of the voltage reference v̂ and the magnitude of the virtual internal voltage v̂vir is adaptively changed depending on overcurrent conditions.

The invention relates to the technical field of output control, in particular to a constant voltage control method, device and equipment based on a fixed period and a storage medium, and the method comprises the steps: calculating an average effective voltage through multiple times of sampling, dynamically adjusting the conduction time through a PI controller, and achieving the synergistic effect of synchronous starting and error compensation. Adjusting the conduction time of each period in real time according to a PI control result; the output deviation caused by battery voltage fluctuation, control delay and multi-channel asynchronous turn-off is effectively relieved, and the constant voltage control precision and stability of multi-path output in a fixed period are improved; specifically, in the turn-on time of a period k, multiple paths of output voltages are sampled for multiple times, and the average effective voltage is calculated, so that the influence of battery voltage fluctuation on output can be accurately captured, and a reliable basis is provided for error calculation; the on time of the (k + 1) th period is adjusted through the PI controller, the output voltage can be balanced in the next period, continuous accumulation of errors is reduced, and the long-term control precision is improved.

The invention provides a double-closed-loop control method and system for a hydrogen fuel cell grid-connected controller, and relates to the technical field of grid-connected control, and the method comprises the steps: setting an outer loop reference voltage, parameters of a PI controller and parameters of a quasi-PR controller, collecting a real-time output voltage and a real-time output current of an inverter, and carrying out the real-time control of the real-time output voltage and the real-time output current of the inverter; comparing the outer loop reference voltage with the real-time output voltage to obtain a voltage amplitude deviation, generating a control quantity by adopting a PI controller according to the voltage amplitude deviation, detecting the phase and the frequency of the power grid voltage in real time by a phase-locked loop, and generating a real-time inner loop reference current according to the control quantity, the phase and the frequency; the difference value between the real-time inner ring reference current and the real-time output current is calculated, a quasi-PR controller is adopted to generate a PWM modulation signal according to the difference value, the inverter is regulated and controlled according to the PWM modulation signal, and the change of a power grid can be tracked more accurately.

The invention discloses polyurethane foam processing and forming equipment, and relates to the technical field of foam cutting machines. A moving mechanism is arranged below the working table, a cutting wire and a voltage controller are arranged above the working table, two limiting slideways which are symmetrically arranged left and right are formed in the working table, two ends of the cutting wire are connected with a secondary tap of the voltage controller, and a primary tap of the voltage controller is connected with an external power supply through a switch. The cleaning brush is used for scraping coking matter residues attached to the surface of the electric heating wire in real time, so that the electric heating wire for cutting the polyurethane foam is cleaned, meanwhile, the negative pressure pump forms negative pressure in the cleaning box through the spiral negative pressure pipe, the scraped residues are sucked into the cleaning and collecting cavity in time, the residues are prevented from falling off, a workbench and the to-be-cut polyurethane foam are prevented from being polluted, and the service life of the workbench is prolonged. The problem of secondary pollution caused by traditional manual cleaning is solved, the lifting height and the horizontal cutting path of the cutting wire can be accurately controlled through the lifting mechanism and the moving mechanism, the size precision of foam cutting is improved, and the cutting requirement is met.

Apparatuses, systems, and methods are described for providing a sensor device. The system includes a control unit and a sensing unit. The sensing unit is coupleable to the control unit via a current loop and includes an input terminal coupleable to the current loop, at least one energy storage unit configured to be charged to a first voltage from the input terminal, a sensing element configured to sense an environmental parameter, wherein the sensing element receives power from the at least one energy storage unit at a second voltage, and wherein the second voltage is lower than the first voltage, a controller configured to receive a sensor signal from the sensing element and to generate an output signal, and an output terminal coupleable to the current loop and configured to transmit output corresponding to the output signal to the control unit via the current loop.

The present disclosure relates to a power supply, a light emitting display apparatus, and a driving method thereof. The light emitting display apparatus can include a display panel configured to display an image, a driver configured to drive the display panel, and a power supply configured to supply a high-level voltage to a first power line of the display panel. Further, the power supply includes a voltage controller configured to perform the steps of receiving a vertical synchronization signal and current amount information of the high-level voltage for driving the display panel from the driver, and boosting the high-level voltage to be supplied to the display panel during a vertical blanking period based on the vertical synchronization signal and the current amount information of the high-level voltage.

The invention discloses a power parallel system and a power control method. The power supply parallel system comprises a plurality of voltage conversion circuits. Each of the voltage conversion circuits includes a current sharing terminal, a voltage converter, and a controller. The current sharing ends of the voltage conversion circuits are mutually coupled to form a parallel structure, so that the shared current is transmitted through the parallel structure. The voltage converter converts a first input voltage to a first output voltage based on a first pulse width modulation signal. The controller receives a first output voltage, a first output current and a shared current. The controller executes the following operations: adjusting the first pulse width modulation signal into a second pulse width modulation signal based on the first output current and the shared current; and controlling the voltage converter to adjust the first output voltage to a second output voltage and adjust the first output current to a second output current based on the second pulse width modulation signal. According to the scheme, the impedance of all the voltage conversion circuits in the power supply parallel system can be accurately matched so as to realize a stable and high-precision current sharing effect.

The present application relates to a drive controller and an electronic device, the drive controller comprising: a voltage determination block for analyzing a gradation of an input image signal and outputting a voltage signal according to the analyzed gradation; a power luminance controller for calculating a load of an input image signal; an overcurrent reference setting block for outputting an overcurrent reference value based on the voltage signal and the load; a current sensing and overcurrent determining unit for receiving the feedback current signal, comparing a current level of the feedback current signal with an overcurrent reference value, and outputting a first signal; and a voltage controller for outputting a voltage control signal for setting a voltage level of the first driving voltage based on the voltage signal and the first signal, in which the overcurrent reference setting block outputs an overcurrent reference value based on a current error corresponding to the voltage level indicated by the voltage signal and a maximum current corresponding to the load.

The invention discloses a magnetic suspension compressor energy feedback method and system, a compressor, a medium and a program product, and relates to the technical field of compressors, the magnetic suspension compressor energy feedback method comprises the following steps: collecting the real-time bus voltage of the compressor, and when the real-time bus voltage is lower than a preset cut-in voltage threshold, controlling the compressor to enter an energy feedback mode, in the energy feedback mode, a motor of the compressor is controlled to provide electric energy for a preset voltage controller; and inputting a preset bus reference voltage and the real-time bus voltage into a voltage controller, and controlling the voltage controller to output a motor quadrature-axis current to a bus capacitor of the compressor so as to supply power to a bearing controller. The bearing controller cannot be powered off after the magnetic suspension compressor is powered off, the dry grinding condition is avoided, and the operation stability of the compressor is kept.