275 results about "Voltage modulation" patented technology

The invention relates to the technical field of inverter pulse width modulation, in particular to a neutral-point potential balance and low common-mode voltage modulation method and system based on an SVPWM inverter, and the method comprises the steps: determining a basic voltage vector based on different switching states of an NPC three-level inverter; respectively determining the midpoint current of each fundamental voltage vector, and determining the fundamental voltage vector causing midpoint potential deviation; combining with a large vector and a zero vector, and performing mode division of a single vector space region; determining an expected current according to the DC side capacitor voltage of the inverter, and constructing a target function based on the expected current; and performing region judgment according to the output synthesized voltage vector, determining a corresponding optimal division mode, obtaining each basic voltage vector of the synthesized voltage vector and a corresponding duty ratio, and determining a switching sequence to obtain a PWM wave. While the neutral-point potential balance and common-mode voltage suppression of the NPC three-level inverter are realized, the switching frequency of the inverter is effectively reduced, and the switching loss is reduced.

The invention discloses a model prediction control method of a high-speed permanent magnet synchronous motor and a related device, and relates to the field of control, and the method comprises the steps: building a stator current equation capable of simulating the behavior of the high-speed permanent magnet synchronous motor based on the position change of a rotor in the same control period, a high control input basic voltage value is obtained by fixing motor parameters and combining a total disturbance parameter of a current loop system and a set stator current tracking target at the next moment at the same time; on the basis of the control input basic voltage value, current loop harmonic voltage compensation is carried out through the control input harmonic compensation voltage value to obtain a control input voltage value, and voltage modulation is carried out according to the control input voltage value to control the high-speed permanent magnet synchronous motor. According to the method, when the stator current equation is constructed, rotor position change parameters in the same control period are innovatively introduced, so that the motor behavior simulation precision is remarkably improved; the defect that the switching frequency is not fixed in a traditional finite set model predictive control algorithm is effectively overcome through the voltage modulation technology.

The invention discloses a low-output-ripple ultralow-offset-voltage operational amplifier and a working method thereof. The low-output-ripple ultralow-offset-voltage operational amplifier comprises a first chopper circuit, a first-stage operational amplifier additionally provided with an offset voltage adjusting circuit, a second chopper circuit, a notch filter, a second-stage operational amplifier and a third-stage operational amplifier which are sequentially connected. The offset voltage adjusting circuit trims the input offset voltage of the first-stage operational amplifier to hundreds of microvolts and then outputs the offset voltage to the second chopper circuit; the first chopper circuit and the second chopper circuit are used for modulating the offset voltage of the first-stage operational amplifier to a chopping frequency, and then the ripple voltage at the chopping frequency is filtered by the notch filter; the first-stage operational amplifier is designed to be a high-gain amplifier so as to restrain input offset voltage errors caused by the second-stage operational amplifier and the third-stage operational amplifier. According to the invention, low output ripple voltage and ultralow input offset voltage can be realized only by using the wave trap with a small area.

Aspects of this disclosure relate to a power amplifier system with symbol-based envelope tracking and fault protection. The system can include a power amplifier and a voltage modulator. The voltage modulator can include switches configured to provide the bias voltage and to provide electric circuit breaker protection. The voltage modulator can include a fault detection circuit that can cause a switch of the switches to provide electric circuit breaker protection in response to detecting a circuit fault. Related methods and voltage modulators are disclosed.

The invention relates to a voltage-mode high-speed transmitter fusing digital pre-distortion and serial driving. The voltage-mode high-speed transmitter comprises a time sequence control unit, a digital signal generation unit, a voltage modulation unit and an output matching unit, the digital signal generation unit is used for generating a pre-modulated digital signal in response to the first clock signal sent by the time sequence control unit; the voltage modulation unit is used for responding to a second clock signal sent by the time sequence control unit and sequentially performing low-speed serialization processing, retiming processing, differential processing and high-speed serialization-output driving processing on the pre-modulated digital signal to obtain a first high-speed level differential signal and a second high-speed level differential signal; and the output matching unit is used for performing impedance matching processing on the first high-speed level differential signal and the second high-speed level differential signal and outputting a corresponding first differential signal and a corresponding second differential signal. The device can be applied to high-order modulation and high-rate application scenes.

The invention relates to the technical field of integrated circuits, and provides a self-adaptive frequency modulation and voltage regulation chip control circuit and method, the circuit comprises a time sequence monitoring module which comprises a critical path replication sub-module and a daisy chain delay sub-module which are connected, and the critical path replication sub-module is used for simulating an actual critical data path in a chip; the daisy chain delay sub-module is used for applying a configurable delay amount on a time sequence to the output data signal; the time sequence performance after different time points is simulated; the first trigger is used for transmitting data signals; the sampling trigger module is used for sampling the data signal output by the time sequence monitoring module; the comparison logic module is used for generating a multi-bit time sequence margin indication code according to a comparison result; the time sequence margin indication code is used for adaptively adjusting the working frequency or the working voltage of the chip. According to the invention, through accurate monitoring and self-adaptive adjustment of a chip time sequence, all design margins can be utilized, and the energy utilization efficiency is improved, so that extreme low power consumption is realized.

The invention discloses a control method for eliminating low-frequency circulating current of a zero common-mode voltage modulation strategy. The control method is used for eliminating the inherent low-frequency circulating current problem of the zero common-mode voltage modulation strategy. Existing zero common-mode voltage modulation strategies all adopt repeated vector sequences, low-frequency circulating current is inevitably introduced, and the practicability of the method is seriously affected. Therefore, the invention provides a control method for adjusting the switching time sequence, and the method realizes the balanced symmetry of the polarity of the circulating current in any two adjacent carrier wave periods by exchanging the switching signals of the parallel bridge arms or reversing the switching signals of the same bridge arm, thereby eliminating the problem of low-frequency circulating current introduced by an asymmetric sequence. According to the method, by adjusting related bridge arm switching signals, alternating conversion of circulating current polarity is achieved, and an original vector time sequence of an existing zero common mode voltage modulation strategy is not damaged. Therefore, the method achieves the optimal common-mode voltage of an existing algorithm, and further eliminates the inherent low-frequency circulating current.

The invention belongs to the technical field of power grid control, and relates to a transformer area flexible interconnection system three-phase imbalance control method and device and a medium. Taking the transformer area converter controlled by the PQ control algorithm as a target transformer area converter; collecting a first control parameter output by an active power PI controller of the target transformer area converter; based on the upper and lower limits of the voltage target value of the DC bus, performing amplitude limiting setting on the first control parameter of the target transformer area converter to obtain the voltage target value; subtracting the voltage target value from the actual voltage value of the direct-current bus, inputting the difference value into the PI controller, and outputting a second control parameter of the target transformer area converter; taking the second control parameter as a direct-axis current target value, subtracting the direct-axis current target value from a direct-axis current actual value, and taking the difference value as the input of a direct-axis current PI controller; and controlling the target transformer area converter based on the voltage modulation signal output by the PQ control framework. The scheme can effectively improve the power supply reliability of the power distribution area and stabilize the DC bus voltage.

The invention provides a flexible direct current converter valve system and a modulation method thereof. Based on a novel hybrid module series structure, target voltage modulation is carried out by controlling a switch device trigger pulse in stages through polarity distribution of modulation wave voltage and bridge arm current. And executing a four-stage pulse adjustment process in an inversion or rectification mode, and dynamically managing the removal and input time sequence of the improved half-bridge power module. According to the method, the trigger pulse is accurately regulated and controlled according to the real-time polarity and the transition state of the voltage and the current, and the problems of instantaneous overcurrent and local overheating of a switching device under the overload condition in the traditional bridge arm topology are avoided. Through staged logic control, the system maintains the stability of the modulation wave voltage, reduces the thermal stress accumulation of the device, improves the endurance capability of the converter valve under a complex working condition, does not need external current limiting intervention, and enhances the operation flexibility and reliability.

The invention provides a method and a device for suppressing a direct current component of an output current of network construction type equipment. The method comprises the following steps: acquiring a three-phase current value of a grid-connected point of the network construction type equipment; decomposing the three-phase current value into dq-axis current components based on coordinate transformation; extracting a dq-axis current component of 50Hz from the dq-axis current components; taking the condition that the 50Hz dq-axis current component is equal to 0 as a control target of a current control model, and obtaining a dq-axis modulation voltage increment required for realizing the control target based on the current control model; and injecting the dq-axis modulation voltage increment into a voltage modulation link of the network construction type equipment to form suppression control on the direct current component of the output current. According to the method provided by the invention, the direct-current component can be quickly suppressed, so that the overcurrent capability of the equipment is released, and the equipment can be used for supporting the system voltage to the greatest extent.

Aspects of this disclosure relate to voltage modulators with staged activation of switches. A voltage modulator can receive supply voltages and provide a selected one of the supply voltages as an output voltage. The voltage modulator can include switches in parallel where one of the switches in parallel activates before another switch in parallel in association by transitioning the output voltage between different supply voltages. Embodiments of this disclosure relate to symbol-based envelope tracking. Related systems and methods are disclosed.

The invention relates to an aircraft spectral data dynamic acquisition method, which comprises the following steps of: designing working modes of a voltage modulation reconstruction type spectrograph, including a full-wave band spectral acquisition mode, a specific wave band spectral acquisition mode and a standby mode; determining use conditions; when the spectrograph works in a full-band spectrum acquisition mode, setting the voltage of the full-band spectrum as m1 groups of voltages, detecting an incident spectrum to obtain m1 groups of light intensity signals, and performing spectrum reconstruction calculation to obtain all spectrum information; when working in a specific wave band spectrum acquisition mode, setting the voltage of a specific wave band spectrum as m2 groups of voltages, m2 < = m1, detecting an incident spectrum to obtain m2 groups of light intensity signals, and performing spectrum reconstruction and calculation to obtain specific spectrum information; in a standby mode, a single voltage is set, an incident spectrum is detected to obtain a group of light intensity signals, and spectrum reconstruction is not carried out. According to the method, the problems of bandwidth occupation, storage pressure, energy consumption increase and the like caused by whole-process full-amount transmission are solved, and meanwhile, the differentiated requirements of different task stages for specific data are met.

The invention relates to the technical field of energy storage systems, and discloses a harmonic suppression method and system of an energy storage converter. According to the method, harmonic disturbance generated during switching of the switching state is analyzed based on the voltage modulation instruction and the switching characteristic parameters, so that prospective prediction of voltage harmonics caused by switching action time sequence deviation is realized, and the problem of detection and control delay existing in a traditional method is solved; carrying out credibility evaluation on the obtained prediction information of the voltage harmonic wave based on the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity, and fusing the real-time current harmonic component and the voltage harmonic wave disturbance prediction quantity based on the result to generate a harmonic wave suppression target with a quick response characteristic and high precision; and a safety voltage control instruction capable of effectively suppressing a harmonic suppression target is obtained through a closed-loop iterative optimization mechanism, so that the inherent contradiction that the harmonic suppression effect and the safety constraint are difficult to consider at the same time is solved, and the comprehensive performance of harmonic suppression is improved.

Presented herein are systems, devices, and methods for inverter control. The device may include a computer-readable medium having instructions stored thereon. The device may include at least one processor configured to execute the instructions. The at least one processor may monitor for an initiation of a connection between an inverter and an electrical bus to convey electrical power. The at least one processor may engage, responsive to detection of the initiation, phase locked loop (PLL) control on the electrical power conveyed via the inverter to synchronize the inverter with the electrical bus. The at least one processor may determine that a synchronization between the inverter and the electrical bus is complete. The at least one processor may disengage, responsive to the determination that the synchronization is complete, the PLL control on the electrical power conveyed between the inverter and the electrical bus.

The application discloses a multi-voltage liquid crystal gate driving system, which comprises a power module, a pixel voltage modulation module, a common voltage modulation module and a voltage output module. The power module is used for outputting a power voltage. The pixel voltage modulation module is used for modulating a pixel voltage required by multi-voltage liquid crystal gate driving. The common voltage modulation module is used for modulating a common voltage required by multi-voltage liquid crystal gate driving. The voltage output module is electrically connected to the common voltage modulation module to output a voltage to be modulated to the common voltage modulation module. The voltage switching module is electrically connected to the power module and the voltage output module respectively, so that the voltage switching module can output a plurality of switching voltages coupled with the power voltage to the voltage output module. The application has the beneficial effect of providing a multi-voltage liquid crystal gate driving system based on switching different resistances and voltage polarity reversal to output a plurality of common voltages and pixel voltages to modulate a plurality of gray scale voltages.

An amplification circuit for a radio-frequency signal comprises a transistor power amplifier (100) and a fixed regulated power supply (110) for providing an output supply voltage to the transistors (100). The circuit comprises a modulator (160) regulating the output supply voltage in a continuously variable manner, said modulator being dependent on a detector (150) measuring an output radio-frequency signal of the transistor.

The invention relates to the technical field of aircraft brake control, in particular to an anti-skid brake control method and device, electronic equipment and a storage medium, and the method comprises the steps of firstly obtaining a first slip rate threshold value and a second slip rate threshold value; then determining a first slip speed interval, a second slip speed interval and a third slip speed interval according to the airplane speed, a first slip rate threshold value and a second slip rate threshold value, and adjusting bias voltage modulation stage output by adopting a variable parameter adjusting method according to the interval where the slip speed of the airplane wheel is located and the slip speed of the airplane wheel; then, the slip speed threshold output is adjusted according to the slip speed of the airplane wheel and a third slip speed threshold value, and the wheel speed change rate threshold output is adjusted according to the change rate of the wheel speed and a wheel speed change rate threshold value; and finally, the sum of the slip speed threshold output, the wheel speed change rate threshold output and the bias voltage modulation stage output is calculated, the braking torque of a brake is controlled according to the obtained sum, and the effect of improving the braking efficiency is achieved.

The invention relates to a network construction type control technology, and aims to provide a network construction converter low-voltage fault ride-through control method based on adaptive synchronization. The method comprises the steps that phase-locked loop control, active-frequency droop control, reactive-voltage droop control and voltage and current control are introduced in the operation process of a network construction converter; the first two control links are used for enabling the network construction converter to have equivalent adaptive angular frequency and calculating to obtain a phase angle; and the last two control links are used for calculating a modulation voltage component and generating a three-phase voltage modulation wave as a control signal of an internal switching device of the network construction converter. According to the method, a more stable converter reference power grid phase angle can be obtained, impulse and interference caused by serious faults of the power grid are reduced, the operation state of the grid-forming converter is automatically adjusted in the fault period, smooth transition is achieved, and the operation stability is improved; based on power droop control, the grid-forming converter has a frequency modulation function similar to that of a synchronous generator, and provides damping and inertia support for the system.

The invention provides an ion optical system high-voltage power supply for a mass spectrometer, and relates to the technical field of high-voltage power supplies, and the ion optical system high-voltage power supply for the mass spectrometer comprises a high-voltage input module of which the output end is connected with the first input end of a modulation circuit so as to provide a first input voltage for the modulation circuit; the input end of the low-voltage input module is in communication connection with the output end of the mass spectrometer, and the output end of the low-voltage input module is connected with the second input end of the modulation circuit so as to provide second input voltage for the modulation circuit; and the output end of the modulation circuit is connected with the input end of the mass spectrometer so as to modulate the second input voltage to obtain a target voltage. According to the ion optical system high-voltage power supply for the mass spectrometer, the low-voltage control signal is modulated into the target voltage through efficient communication with the control system of the mass spectrometer, and the diversified voltage requirements of the ion optical system of the mass spectrometer in different working modes are met.

The application relates to a drain voltage modulation solid-state source circuit and an electronic atomization device. The drain voltage modulation solid-state source circuit comprises a drain voltage modulation power supply for generating a power supply voltage; a microwave signal source and a power amplification module, the microwave signal source generates a microwave signal, receives power of the drain voltage modulation power supply, and enhances the microwave signal strength through the power amplification module; a microwave resonant cavity for microwave heating of materials in the microwave resonant cavity; and a processor for controlling the signal frequency of the microwave signal source in the microwave signal source and the power amplification module. The scheme provided by the application can realize a heating non-combustion electronic cigarette in a microwave heating mode.

Various embodiments disclosed presents pixel driver circuits that utilize integrated diode structures to enhance sub-threshold swing and modulate threshold voltage. Conventional transistor-only designs often encounter challenges in achieving precise control and efficiency, limited by their sub-threshold swing and voltage modulation capabilities. Various embodiments incorporate advanced MOSFETs in series with diodes without an additional mask and process knob, enabling advanced control over the LED current without a larger area penalty and less process variation with device sub-threshold engineering. Such transistor-diode configuration improves brightness, gray-scale accuracy, and overall display performance, leading to improved power efficiency, advanced display uniformity, and improved reliability for LED devices.

A magnetic storage element according to one embodiment of the present disclosure comprises: a tunnel barrier layer; a storage layer provided to the tunnel barrier layer; and a voltage modulation enhancement layer provided on a surface of the storage layer on the side opposite to the tunnel barrier layer side.

The present application discloses a control method for a power factor of a flyback inverter during grid connection, and a controller. The method comprises: acquiring a working electrical signal of a target power grid; performing phase locking on the working electrical signal to obtain a voltage modulation wave signal; on the basis of a power factor angle corresponding to a preset power factor, performing phase shift on the voltage modulation wave signal to obtain a current modulation wave signal; selecting part of the waveform of the voltage modulation wave signal as a correction waveform of the current modulation wave signal in a corresponding time period; fusing the correction waveform with part of the waveform of the current modulation wave signal to obtain a corrected modulation wave signal waveform; and controlling a flyback inverter to output, to the target power grid or an electric device, a target alternating current corresponding to the corrected modulation wave signal waveform. By using the corrected modulation wave signal generated by the method of the present application to control the flyback inverter, accurate adjustment of the power factor of the flyback inverter during grid connection can be achieved, and harmonics are reduced.

The invention provides a power module control method based on a three-phase SEPIC isolation topology, and the method comprises the steps: calculating an output voltage modulation value according to an output voltage sampling value, an output voltage target value and an output current sampling value of a power module; according to the output voltage modulation value, the duty ratio or the switching frequency of a switching tube of each single-phase converter unit in the power module is calculated; and generating a PWM driving signal for the switching tube of each single-phase converter unit in combination with SPWM modulation according to the duty ratio or the switching frequency. According to the control method of the power module based on the three-phase SEPIC isolation topology, output voltage is used as an outer loop, output current is used as an inner loop, the duty ratio or frequency of a switching tube in the power module is calculated through obtained loop output, and then the power module is controlled in an SPWM mode; therefore, input current is not needed, control is simple, and cost can be reduced.

The invention discloses a negative voltage suppression method and device for a network-forming inverter and a storage medium. The method comprises the following steps: executing signal splitting according to a three-phase electric signal at a grid connection point, and determining a positive sequence component and a negative sequence component; executing droop control according to the positive sequence component, and determining a positive sequence voltage modulation instruction; according to the negative-sequence component, coordinate transformation and negative-sequence current closed-loop control are executed, and a negative-sequence voltage modulation instruction is determined; and determining a comprehensive modulation signal according to the positive sequence voltage modulation instruction and the negative sequence voltage modulation instruction. According to the invention, positive and negative sequence separation is carried out on the three-phase electric signal, the suppression strategy taking the negative-sequence current as an object is constructed, and the power grid angle and the transmission line impedance angle are combined to realize negative-sequence current control, so that the negative-sequence component is weakened. Meanwhile, the positive sequence signal is independently used for droop control, voltage and frequency support of the inverter is guaranteed, correction for frequency reference value oscillation is introduced into droop control, and the transient performance of the grid-forming inverter under the unbalanced power grid is improved.

A network type power supply fault current suppression method based on additional virtual impedance and power angle control, comprising: if it is judged that the network type power supply with virtual synchronous generator (VSG) as the main structure is below the threshold after the fault occurs, the reactive power reference value is calculated and adjusted according to the drop degree to meet the low voltage ride through condition; the difference between the VSG output voltage and the grid voltage and the maximum bearing current of the inverter are used to quantitatively calculate the virtual impedance required for current limiting; the active power reference value is modified by using the reactive loop reference voltage before and after the fault to maintain the VSG power angle stability; the mathematical model of the inverter in the VSG is constructed, the virtual impedance is added to the control loop by using the coordinate transformation and the grid side current transformation, and the output drive signal is controlled by inputting the voltage modulation into the SVPWM, so that the inverter completes the overcurrent limiting. The application solves the problem that the output current of the network type new power system increases too fast to cause system instability when the fault occurs.

The application relates to the technical field of integrated circuits, and provides a chip control circuit and method for adaptive frequency modulation and voltage modulation, which comprises a timing monitoring module, a critical path replication submodule and a daisy chain delay submodule connected to the timing monitoring module, the critical path replication submodule is used for simulating an actual critical data path in a chip, the daisy chain delay submodule is used for applying a configurable delay amount on the timing of an output data signal, so as to simulate the timing performance after different time points, a first flip-flop is used for transmitting the data signal, a sampling flip-flop module is used for sampling the data signal output by the timing monitoring module, a comparison logic module is used for generating a multi-bit timing margin indication code through a comparison result, and the timing margin indication code is used for adaptively adjusting the working frequency or working voltage of the chip. Through accurate monitoring and adaptive adjustment of the timing of the chip, all design margins can be utilized, the energy utilization efficiency is improved, and therefore, the ultimate low power consumption is realized.

The invention relates to a method for operating a 3-level inverter (1), comprising an intermediate circuit (2) with three terminals (DC+, DC-, N) and three switching sections (3a, 3b, 3c), each with a phase tap (u, v, w) for electrically connecting to a respective phase (Phu, Phv, Phw) of an electric drive machine, wherein each switching section (3a, 3b, 3c) has three switching devices (S1, S2, S3), wherein - for modulating an operating point-specific output voltage, a control device determines a switching pattern by means of which the switching devices (S1, S2, S3) are transferred to different switching states and thereby connect the phase tap (Phu, Phv, Phw) of the respective switching section (3a, 3b, 3c) to one of the terminals (DC+, DC-, N) of the intermediate circuit (2) while generating a voltage vector, - during the modulation of the output voltage, curves (Iphu, Iphv, Iphw) of at least one characteristic of the electric drive unit are measured by a sensor device, for example on the basis of current and / or voltage measurements of the electrical phases (Phu, Phv, Phw), - the control device compares the measured curves (Iphu, Iphv, Iphw) with predetermined, switching pattern-specific error profiles, which each characterize a faulty short-circuited switching state of one of the switching devices (S1, S2, S3), based on the comparison a faulty short-circuited switching device (S1) of a switching section (3a) is identified and a switching pattern-specific, safe state is predicted by identifying the two switching devices (S1, S2) of the other switching sections (3b, 3c) which are to be closed to provide an active short circuit and which are connected to the same terminal (DC+) of the intermediate circuit (2) as the faulty switching device (S1).

The application discloses a kind of based on q-axis voltage orientation's doubly-fed fan rotor side converter control method, the method is as follows: controller will the mechanical power of wind turbine output as active reference signal, obtain generator stator voltage and stator rotor current by voltage and current sensor, after coordinate transformation, stator voltage is aligned to q-axis, the active power and reactive power of stator side output are calculated, then by feedforward compensation and decoupling control, generate rotor voltage modulation signal under dq axis, by coordinate inverse change is sent to SVPWM link input end, exports the switch tube control signal of doubly-fed generator machine side converter, to realize the independent control of active power and reactive power by rotor current.It can effectively solve the problems such as large flux linkage measurement error, active and reactive power coupling, limited reactive power compensation in traditional stator flux linkage orientation control, without observing stator flux linkage, can improve the power supply quality of doubly-fed wind power system.

An oscillator comprises a reference current generating circuit, a voltage modulator circuit and an oscillating circuit. The reference current generating circuit is used for generating a reference current. The voltage modulator circuit is configured to receive a feedback voltage and perform a voltage modulation operation according to a first reference voltage and the feedback voltage to generate a modulated voltage. The oscillation circuit is coupled to the reference current generating circuit and the voltage modulator circuit and is used for generating an oscillation signal with an oscillation frequency according to the reference current and the modulated voltage.