601 results about "Voltage controller" patented technology

The invention belongs to the technical field of hardware-in-loop simulation testing, and particularly relates to a hardware-in-loop interface board card. According to the hardware-in-the-loop interface board card disclosed by the invention, mutual conversion between a simulation machine input / output low-voltage signal and a controller output / input high-voltage signal is realized through a simulation machine signal photoelectric conversion sending circuit and a controller signal photoelectric conversion sending circuit in the signal conditioning module; the low-voltage signal output by the simulation machine interface can indirectly control the high-voltage signal input into the controller interface, and the high-voltage signal output by the controller interface can be converted into the low-voltage signal matched with the simulation machine interface, so that the problems of specification difference and signal matching difference between the IO interface and the controller interface are solved; the low-voltage simulator system is electrically isolated from the high-voltage controller system, so that the influence of the high-voltage controller on the simulator is avoided; and in the aspect of structural design, the hardware-in-the-loop interface board card is divided into an upper layer board and a lower layer board, so that the occupied area is reduced.

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.

A power factor corrector (PFC) is used to receive input power and supply power to a load via a DC / DC converter. A method of controlling a PFC is executed by a PFC controller used to control the PFC, where the PFC controller includes a voltage controller. The method includes receiving a first signal transmitted from a DC / DC controller used to control the DC / DC converter, where the first signal indicates the load, deriving a second signal based on the first signal, where the second signal is an expected output control signal of the voltage controller under the load indicated by the first signal, and configuring the voltage controller according to the second signal so as to keep an output voltage Vbulk of the PFC to the DC / DC converter stable.

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 provides a distributed secondary control method for convergence of voltage frequency of an island alternating-current micro-grid within preset time, relates to the technical field of micro-grids, and describes a communication network among distributed power supplies in the island alternating-current micro-grid based on a graph theory. Based on an output frequency equation and a voltage amplitude equation of droop control in a primary control layer of the distributed power supply, and in combination with a communication network diagram, a frequency controller and an active power controller in a secondary control layer are respectively designed; the frequency of the distributed power supply is recovered to the rated value within the preset time, and meanwhile, the target of distributing the active power according to the proportion is achieved. And designing a voltage controller in the secondary control layer to achieve the target that the output voltage of the distributed power supply is recovered to a rated value within a preset time, so that the minimum upper bound of the voltage / frequency convergence time of the island alternating current micro-grid can be preset within any physical allowable range to adapt to different application requirements.

The invention discloses an intelligent multifunctional high-voltage megohmmeter which comprises a megohmmeter, the outer wall of the megohmmeter is fixedly connected with a megohmmeter assembly, the top of the megohmmeter is fixedly connected with a wiring terminal, the left side of the megohmmeter is fixedly connected with a display screen, and the left side of the megohmmeter is fixedly connected with a function button. The intelligent multifunctional high-voltage megohmmeter is characterized in that a display screen is arranged on the left side of the megohmmeter, a function button is arranged at the left lower end of the display screen, the left side of the megohmmeter is rotationally connected with a voltage controller, the voltage controller is arranged at the right side of the function button, and the outer wall of the megohmmeter is fixedly connected with a charging interface. The heat-conducting silica gel sheet has excellent flexibility, compressibility and heat-conducting property, can be tightly attached to each heat dissipation surface at the bottom of the high-voltage megohmmeter, ensures the uniformity and integrity of heat transfer, can quickly conduct heat generated in the high-voltage megohmmeter to an external heat dissipation part, and effectively prevents heat accumulation.

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 power-on self-starting reverse-flowing self-discharging system for a frequency converter, and the system is characterized in that a flyback power module outputs + 15V control voltage to a DC / AC controller and a sequential logic control circuit after three-phase alternating current is powered on; after the DC / AC controller is powered on by the flyback power supply module, a switching tube in the DC / AC power module is controlled to be in a closed state; the sequential logic control circuit is electrified by the flyback power supply module and then controls a thyristor in the pre-charging / discharging circuit to be conducted; the AC / DC rectifier module converts three-phase alternating current into direct current, is connected with the pre-charging / discharging circuit and charges an energy storage capacitor in the pre-charging / discharging circuit; the DC / AC power module inputs backward flowing current to an energy storage capacitor in the pre-charging / discharging circuit; on one hand, the pre-charging / discharging circuit rectifies direct current input by the AC / DC rectifier module and then pre-charges an energy storage capacitor in the circuit, and on the other hand, the pre-charging / discharging circuit receives backward flowing current input by the DC / AC power module. According to the invention, the generation of surge current can be inhibited, and the power-on time sequence of first power-on control power and then power-on power power can be realized at the same time.

A driving controller includes an overcurrent load calculator calculating a load of an input image signal, comparing the load and a reference load, and outputting a first signal corresponding to a first comparison result, an overcurrent reference controller analyzing a grayscale of the input image signal and outputting one of a first reference current signal corresponding to the grayscale and a second reference current signal, whose current level is higher than that of the first reference current signal, as a reference current signal, a current sensor receiving a feedback current signal, comparing a current level of the feedback current signal and a current level of the reference current signal, and outputting a second signal corresponding to a second comparison result, and a voltage controller outputting a voltage control signal for adjusting a voltage level of a driving voltage, based on the first signal and the second signal.

A system includes an inverter including: a point-of-use controller for a power module, the point-of-use controller including: a positive voltage connection configured to receive a positive control voltage from a high-voltage controller; a command connection configured to receive a command from the high-voltage controller; a message connection configured to send and receive a message to and from the high-voltage controller; a negative voltage connection configured to receive a positive control voltage from the high-voltage controller; a north gate connection configured to output a north gate control signal to a north group of one or more switches; a south gate connection configured to output a south gate control signal to a south group of one or more switches; a north sense connection configured to connect to a first portion of a sensing trace; and a south sense connection configured to receive a second portion of the sensing trace.

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.

The invention relates to a comparator calibration circuit and a comparator calibration method. The comparator calibration circuit is characterized in that a chip test socket is connected with a chip to be tested; the chip to be tested comprises a plurality of comparator modules; the relay selection circuit is connected with the chip test socket and is used for determining a target comparator module from the plurality of comparator modules according to test requirements; the first converter is connected with the relay selection circuit and is used for determining input voltage; the second converter is connected with the relay selection circuit and is used for receiving the output voltage; and the controller is used for calibrating the target comparator module according to the input voltage and the output voltage of the target comparator module, so that the offset value of the target comparator module is smaller than a target threshold value. According to the comparator calibration circuit, the calibration precision of the comparator modules is improved while automatic calibration of the plurality of comparator modules is realized, and high-precision automatic calibration of the plurality of comparator modules can be realized based on the same comparator calibration circuit.

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.