101 results about "Voltage modulation" patented technology

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 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 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.

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.

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.

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.

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.

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.

The application relates to the technical field of data security and discloses an industrial computer data security protection method based on edge computing, which comprises the following steps: synchronously collecting the arrival time, byte size, running voltage and absolute temperature of a data packet; smoothing a temperature step by using a real-time voltage modulation coefficient to obtain an adaptive temperature change rate; stripping a linear drift rate of an observation window, combining a temperature proportion to extract an intrinsic heat power deviation; mapping an expected calculation load by using a voltage drop depth; extracting a communication energy footprint based on a data packet time sequence; calculating an absolute difference value of a normalized heat power and the expected calculation load, and amplifying the absolute difference value through the communication footprint to obtain a cross-domain security abnormality deviation; and finally generating a dynamic threshold according to a four-order moment feature of a deviation sequence deviation to perform abnormality determination. The application eliminates environmental thermal drift and quantization noise interference, decouples legal control task fluctuation, and realizes efficient and low-delay data security protection.

A multi-voltage power management integrated circuit (PMIC) is disclosed. More specifically, the multi-voltage generation circuit includes multiple voltage modulation circuits each configured to generate and maintain a respective one of multiple modulated voltages based on a battery voltage and a respective one of multiple reference voltages. Contrary to using multiple voltage-current modulation circuits, such as direct-current-direct-current (DC-DC) converters, to generate the multiple reference voltages, the multi-voltage PMIC is configured to share a single voltage-current modulation circuit among the multiple voltage modulation circuits. As such, the multi-voltage PMIC can concurrently support multiple load circuits (e.g., power amplifier circuits) with a significantly reduced footprint.

This invention discloses a power supply circuit and an electrical device. The power supply circuit includes a detection circuit and a control circuit. The input terminal of the detection circuit is connected to AC power, and the output terminal of the detection circuit is connected to the control terminal of the control circuit. The output terminal of the control circuit is connected to the control system of the electrical device. The detection circuit outputs a power failure signal after detecting a first preset time of AC power failure. The control circuit modulates the voltage or the operating frequency based on the power failure signal, extending the holding time of the voltage transmitted to the control system to a second preset time. This power supply circuit can detect AC power failure using the detection circuit and extend the output holding time using the control circuit. Without adding an AC power failure signal line or an output capacitor, it solves the problem of short output holding time during AC power failure, thus meeting the requirements for power failure protection.

This application provides a method and apparatus for suppressing low-frequency pulsation of capacitor voltage in a full-power MMC frequency converter. The method includes: when a variable-speed pumped storage unit is in variable-frequency start-up or braking mode, and the output frequency of the MMC frequency converter is within a predetermined range, generating a first voltage modulation wave component based on a predetermined high-frequency zero-sequence voltage and the three-phase output voltage of the MMC frequency converter; generating a second voltage modulation wave component based on a predetermined high-frequency bridge arm circulating current and the bridge arm circulating current of the MMC frequency converter; and generating a drive signal based on the first and second voltage modulation wave components. By injecting a high-frequency zero-sequence voltage into the three-phase output voltage and a high-frequency bridge arm circulating current into the bridge arm circulating current, capacitor voltage pulsation can be effectively suppressed.

The invention discloses a network construction type converter constant frequency parallel synchronization method and system based on DC side Boost converter control, and relates to the field of new energy power generation, and the method comprises the steps: presetting a reference instruction voltage and a reference instruction frequency of the AC side of a network construction type converter, and a reference instruction current of the DC side of the network construction type converter; collecting the machine side current of the grid-forming converter, the input current of the Boost converter, the alternating current side capacitor voltage and the direct current side capacitor voltage; determining phase information of the network-forming converter; generating a first voltage modulation wave signal; and generating a driving pulse of the AC side IGBT of the grid-forming converter. According to the invention, a DC voltage synchronization control link is added in a control circuit of the constructed network type converter, and direct voltage synchronization control is adopted to realize output voltage amplitude, frequency following instruction, output power uniform distribution and output voltage phase synchronization of the constructed network type converter based on DC side Boost converter control.

A power supply circuit including an input circuit configured to modulate an input voltage into a first working voltage and a second working voltage, and output them; a low voltage circuit connected to the input circuit, to generate a first output voltage and output it; a high voltage circuit connected to the input circuit, to generate a second output voltage and output it; an isolation circuit configured to output the first output voltage, and configured to isolate the low voltage circuit from the second output voltage higher than a preset isolation voltage according to the preset isolation voltage when the high voltage circuit outputs the second output voltage; and a control circuit connected to the high voltage circuit and the low voltage circuit, and configured to respectively control the high voltage circuit and the low voltage circuit to generate the first output voltage and the second output voltage.

The application provides a steady-state power operation interval calculation method and system, which comprises the following steps: constructing an explicit mathematical model of a modular multilevel converter; constructing a converter capacity constraint and generating a power region according to the converter capacity constraint; selecting a plurality of power points from the power region according to a first preset rule, and substituting the power points into the explicit mathematical model to obtain electrical quantities such as converter capacity, AC current effective value, voltage modulation ratio under the corresponding power points; traversing whether the electrical quantities such as converter capacity, AC current effective value, voltage modulation ratio under each power point meet the corresponding constraint conditions; if the electrical quantities such as converter capacity, AC current effective value, voltage modulation ratio all meet the corresponding constraint conditions, the power point is classified into a preset operation interval set. The application can avoid the problem of critical divergence, and has the advantage of fast calculation speed.

An adaptive voltage modulation circuit is provided. The adaptive voltage modulation circuit includes a plurality of driver circuits and a voltage control circuit. A first one of the driver circuits outputs a feedback signal to a next one of the driver circuits according to data of a load connected thereto. Each of the driver circuits, except for the first one and a last one of the driver circuits, according to the data of the load connected thereto and the feedback signal from a previous one of the driver circuits, outputs a next feedback signal to a next one of the driver circuits. The last one of the driver circuits, according to the data of the load connected thereto and the feedback signal from a previous one of the driver circuits, instructs the voltage control circuit to supply a common modulation power signal to each of the loads.

The application discloses a control circuit, a control method and a resonant converter compatible with LLC and DCX, the control circuit comprises: a reference voltage generation circuit, which is used for generating a corresponding pulse width modulation reference voltage according to a selected control mode; a modulation signal generation circuit, which is used for comparing a slope voltage with the pulse width modulation reference voltage to output a pulse width modulation signal, and comparing the slope voltage with a correlation voltage of the pulse width modulation reference voltage to output a pulse frequency modulation signal; the correlation voltage comprises at least one voltage used for generating the pulse width modulation reference voltage; and a logic control circuit, which is used for generating an upper tube driving signal and a lower tube driving signal according to the pulse width modulation signal and the pulse frequency modulation signal. The application can configure the resonant converter to work in the DCX mode or the LLC mode according to different scenes, and reduces the design complexity and cost of the resonant converter system.

The invention discloses a power distribution method and device for an asymmetric inverter system, equipment and a medium, and the method comprises the steps: obtaining a total voltage modulation wave and a weight factor of the asymmetric inverter system, and carrying out the modulation according to a preset carrier modulation mode; the triangular carrier is converted into an upper carrier and a lower carrier which are used by a three-level inverter, the triangular carrier is converted into an intermediate carrier which is used by a two-level inverter, and in a modulation wave period, when the weight factor is larger than the instantaneous amplitude of the weight triangular wave, according to the amplitude of the intermediate carrier, the triangular carrier is converted into the upper carrier and the lower carrier which are used by the three-level inverter. Clamping the voltage of the two-level inverter to a first maximum voltage modulation wave, and calculating a compensation voltage modulation wave of the three-level inverter according to the total voltage modulation wave; and when the weight factor is smaller than the weight load wave instantaneous amplitude, clamping the voltage of the three-level inverter to a second maximum voltage modulation wave, and calculating a compensation voltage modulation wave of the two-level inverter according to the total voltage modulation wave. Dynamic management of flexible power distribution can be realized.

Certain aspects of the present disclosure are directed towards a switched-mode power supply (SMPS). The SMPS generally includes a first transistor, an inductive element coupled to the first transistor, and a driver circuit configured to: generate one of a first gate drive voltage and a second gate drive voltage to turn on the first transistor, the one of the first gate drive voltage and the second gate drive voltage being selected based on an output current of the SMPS, wherein the first gate drive voltage is different than the second gate drive voltage; and provide the one of the first gate drive voltage and the second gate drive voltage to a gate of the first transistor.

This invention discloses a three-phase series winding topology voltage modulation method and system for suppressing common-mode interference, belonging to the field of AC drives and their common-mode suppression. The method includes: receiving a reference voltage vector command V. ref V ref Projecting onto the αβγ axis yields V ref‑α V ref‑β and V ref‑γ From all voltage vectors that can be generated by a three-phase series winding topology with a common-mode voltage amplitude of 0 and non-zero in γ space, the first voltage vector is selected for synthesizing V. ref‑γ According to V ref‑α V ref‑β And the voltage projection of the first voltage vector in the αβ plane, and the selection of the second voltage vector from all non-zero voltage vectors that can be generated in γ space by the three-phase series winding topology; to generate V ref‑α V ref‑β and V ref‑γ To achieve the desired effect, the duration of each voltage vector in the first and second voltage vectors is calculated to modulate the three-phase series winding topology. This simultaneously achieves common-mode rejection and zero-axis current control.

The invention discloses a single amplifier-based CTLE with direct current offset and common mode voltage modulation functions, and mainly solves the technical problems that the direct current working point of the existing CTLE is easily influenced by process deviation, input signal common mode voltage and current mismatch, an additional direct current offset elimination loop is needed, and the design and area complexity is increased. The CTLE comprises a first-stage equalization unit EQ1, a second-stage equalization unit EQ2, a low-pass filter LPF, a frequency compensation unit and an offset and common-mode multiplexing amplifier OCMA. The CTLE adopts a single offset and common-mode multiplexing amplifier OCMA to complete direct current offset elimination and direct current output control at the same time, so that the design and area complexity can be reduced.

This invention discloses a chirp-compensated direct-modulation semiconductor laser, which, from bottom to top along its growth direction, comprises a lower cladding region, a chirp compensation region, a spacer region, an active region, and an upper cladding region. The chirp-compensated direct-modulation semiconductor laser also includes an AC current source and an AC voltage source. The AC current source is used to inject a modulation current into the active region, and the AC voltage source is used to apply a modulation voltage to the chirp compensation region. The modulation current and modulation voltage are out of phase. This invention provides a chirp compensation region below the active region. When an out-of-phase voltage is provided externally, the material in the chirp compensation region generates negative chirp, thereby partially or completely canceling the positive chirp of the active region.