187 results about "Voltage modulation" patented 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 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.

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.

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 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 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.

The application provides a substrate voltage modulation type image sensor pixel unit, namely array, and an operation method. The pixel unit comprises a field effect tube and a triode, the doping type of the substrate of the field effect tube is the same as the doping type of the base of the triode, but is opposite to the doping type of the source and the drain of the field effect tube; the substrate of the field effect tube is connected with the base of the triode, the emitter of the triode is connected with one of the source and the drain of the field effect tube as the source of the image element, the collector of the triode is connected with the other of the source and the drain of the field effect tube as the drain of the image element, and the gate of the field effect tube is connected with an external voltage as the gate of the image element. The image sensor provided by the application can be applied to submicron pixels, has low dark current, low crosstalk, high signal-to-noise ratio, and the size of the image element can be reduced to 9F 2 and other characteristics.

Optical states in TIR-based image displays may be modulated by movement of electrophoretically mobile particles into and out of the evanescent wave region at the interface of a high refractive index convex protrusions and a low refractive index medium. The movement of particles into the evanescent wave region may frustrate TIR and form dark states at pixels. Movement of particles out of the evanescent wave region may allow for TIR of incident light to form bright states at pixels. The movement of the particles may be controlled by employing the drive methods of pulse width modulation, voltage modulation or a combination thereof.

The present application relates to the technical field of voltage modulator, particularly relates to a voltage modulator with reduced transient voltage drop; the voltage modulator of the present application, transistor M5, M13, and resistance R3, R4, capacitor C2, C3 realize the function of reducing transient voltage drop.When the output voltage VOUT drops rapidly, the change is coupled to node V1 through capacitor C2, so that V1 also follows the drop, the current of transistor M5 increases, this current flows through transistor M13, so that the voltage of node V2 increases, and then is coupled to the gate node V3 of transistor M11 through capacitor C3, the current of transistor M11 increases, this current discharges the gate node V4 of transistor M4 through transistor M7, increases the current of transistor M4, and this current is used to pull back the output voltage VOUT, so that the function of reducing transient voltage drop is realized.

The invention relates to the technical field of model construction, and particularly discloses a 100GNRZ direct dimming anti-lightning stroke SOP scrambling voltage model construction method based on deep learning, and the method comprises the following steps: S1, collecting the bias voltage, modulation depth, SOP scrambling data and environmental parameters of a thin film lithium niobate modulator in a simulated lightning stroke environment to construct a data set; s2, performing normalization and noise filtering on the data, extracting correlation characteristics of bias voltage and modulation depth and time sequence characteristics of SOP scrambling by adopting a CNN-LSTM hybrid network, and introducing physical characteristics of a modulator as constraints; s3, taking SOP tolerance maximization and photoelectric loss minimization as targets, and training the model through an adaptive gradient descent algorithm to obtain an anti-lightning model; and S4, deploying the model to 100GNRZ direct modulation light transmission equipment, and dynamically generating an optimal bias voltage for compensation by monitoring equipment parameters in real time.

The application discloses a kind of based on voltage modulation's deformable mirror slope response matrix measurement method and device, belong to adaptive optics technical field, this method includes: the range of influence of single driver is calculated, and driver is grouped;According to the sampling frequency of Hartmann wavefront sensor, the frequency response characteristics of deformable mirror, generate the voltage control signal for controlling deformable mirror;According to driver group number, voltage control signal is applied to all drivers and the wavefront sensor slope signal of each group driver is recorded;Wavefront sensor slope signal is bidirectional filtering, the slope signal corresponding to each driver is recovered, the difference of each slope signal and its corresponding voltage control signal phase is calculated, voltage control signal is truncated, and the response matrix of deformable mirror is obtained.The application realizes that the time of deformable mirror slope response matrix measurement is effectively shortened, avoids the problem of the decline of response matrix calculation accuracy due to voltage control signal and slope signal phase misalignment.

This application discloses an electrostatic discharge (ESD) protection circuit and chip. The ESD protection circuit includes a conversion module and a dissipation module. The conversion module is connected to a power supply and a ground terminal. The conversion module is configured to obtain a second voltage based on the first voltage when the first voltage provided by the power supply exceeds a threshold voltage. The threshold voltage is the voltage corresponding to the generation of ESD, and the second voltage is less than the first voltage. The dissipation module is connected to the output terminal of the conversion module and to the power supply and ground terminal. The dissipation module is configured to receive the second voltage, operate according to the second voltage, and modulate the first voltage to be less than the threshold voltage before outputting it to the electronic device. In other words, the technical solution of this application reduces the overvoltage corresponding to the generation of ESD through the conversion module and avoids drawing additional current, thereby protecting subsequent electronic devices from damage caused by ESD overvoltage. Furthermore, the structure is simple and the cost is reduced.

The utility model discloses a fan and illumination low-voltage double-control drive circuit and a ceiling fan lamp, which comprise a power supply modulation module, a voltage transformation module, a fan motor assembly, a fan drive module, an illumination assembly, an illumination drive module, a control module and a control assembly, and the input end of the voltage transformation module is connected with the output end of the power supply modulation module; the voltage transformation module modulates the voltage of the power supply to be smaller than 36 V and outputs the voltage, the fan motor assembly and the fan driving module are connected to form a fan driving branch, the output end of the voltage transformation module supplies power to the fan motor assembly, the lighting assembly and the lighting driving module are connected to form a lighting driving branch, and the output end of the voltage transformation module supplies power to the lighting assembly. The control module is connected with the control assembly, the controlled end of the fan driving module and the controlled end of the lighting driving module so as to control at least one of the fan motor assembly and the lighting assembly to operate according to the control instruction. The design is simple and compact in structure and safe and reliable to use.