9 results about "Pulse polarity" patented technology

The present application belongs to the technical field of vehicle transmission system control, and particularly relates to a transfer case gear shifting control method and system based on bus feedback. The method comprises: acquiring multi-channel bus data; determining pulse polarity and amplitude and generating a bipolar pulse sequence; inputting the pulse sequence into a memristor array to accumulate and change its conductance value; when the last period conductance matrix meets the saturation condition, applying a reverse callback pulse to the high conductance channel; reading the current period conductance matrix and deriving a conductance change rate matrix to generate a driving intention feature map; calculating the structural similarity index of the feature map and the target gear shifting condition template, and outputting the transfer case gear shifting instruction when it is higher than the adaptive decision threshold, which is dynamically adjusted based on the long-term average level and the recent change fluctuation degree of the conductance state. The present application realizes parallel storage and calculation and adaptive matching of driving intention through the memristor array, and improves the accuracy and ride smoothness of the transfer case gear shifting control.

An inverter 2 is set, during a pause period of the inverter, in a switching state in which a primary-side winding of a transformer 3 is short-circuited. The initial pulse width in an inverter operation period is fixed to 0.5 times a pulse period. A positive pulse width, which is required for making the exciting current of the transformer 3 coincide with that at the start of the inverter operation period for each inverter operation period, is calculated and cumulated for each inverter operation period to calculate a cumulative value. On the basis of the cumulative value, the initial pulse polarity of the next inverter operation period is selected so that a DC magnetic flux of a transformer core is suppressed in the next inverter operation period. In an isolated DC / DC converter that performs intermittent operation using the transformer and the inverter, a desired operation characteristic is obtained by correcting the inverter output voltage.

This invention belongs to the field of electronic and information control technology, specifically a memristor-based multi-sensor fusion hybrid analog-digital self-balancing control system. It includes an analog computing module, a digital computing module, a balancing execution module, and a power supply module. The analog computing module integrates an accelerometer and a gyroscope, achieving data fusion through a memristor-analog Kalman fusion filter circuit. It generates analog control signals based on a memristor-analog PD controller circuit, and simultaneously utilizes the memristor dynamic adjustment circuits in both circuits to achieve real-time parameter optimization, applying positive or negative pulses according to pulse polarity to adjust the resistance state. The digital computing module acquires signals and rotational speed data through an ADC, uses a cascaded PID algorithm to generate PWM signals, and drives a brushless motor in conjunction with a momentum wheel to complete millisecond-level dynamic balancing adjustment. The balancing execution module employs a high-precision bidirectional torque momentum wheel, adaptable to complex motion scenarios such as robots and drones. This invention utilizes memristors for analog computing, combining non-volatility and low power consumption characteristics, reducing system load and improving response speed.

In an isolated DC / DC converter that performs intermittent operation using a transformer and an inverter, bias magnetization of the transformer is suppressed. [Solution] During inverter idle periods, inverter 2 is in a switching state in which the primary winding of transformer 3 is short-circuited. The first pulse width during inverter operation periods is fixed to 0.5 times the pulse period. For each inverter operation period, the positive pulse width required to match the excitation current of transformer 3 with that at the start of the inverter operation period is calculated, and this is integrated for each inverter operation period to calculate an integrated value. Based on the integrated value, the first pulse polarity of the next inverter operation period is selected so that it will be in a direction that suppresses the DC magnetic flux in the transformer core during the next inverter operation period.

The invention discloses a partial discharge original waveform wave head bottom noise reduction method, and belongs to the field of power equipment state monitoring and fault diagnosis, and the method comprises the steps: inputting original waveform data collected by an ultrahigh frequency sensor; preliminarily estimating a wave head position; a safety interval is delimited in front of the initial wave head position to serve as a background noise analysis interval, and a background noise mean value mu and a standard deviation sigma are calculated; backtracking scanning is carried out from the initial wave head position, and an accurate wave head starting point Pexact is found; replacing Pexact front data with mu or integrally reducing mu to realize wave head front planarization; and outputting the noise reduction waveform. The system comprises a data acquisition module, a buffer memory, a processor and an output interface, and the noise reduction is expanded from pulse polarity identification and dynamic safety interval prevention. The method thoroughly eliminates the interference of the noise in front of the wave head on time difference positioning, retains the complete characteristics of the wave head, is small in calculation amount, is good in real-time performance, is high in adaptability, remarkably improves the partial discharge positioning precision, and is suitable for the ultrahigh-frequency partial discharge detection of high-voltage electrical equipment of a hydropower station.

The application discloses a control circuit and method of a relay, and relates to the technical field of electronic control. A specific state switching module is configured to receive and analyze the level state of a control signal and output corresponding internal control instructions accordingly; a self-terminating pulse generation module is triggered by the state switching module and is configured to generate only one self-terminating driving pulse with a predetermined duration at each triggering time through the transient characteristics of capacitor charging, so as to avoid burning the relay coil due to the continuous validity of the control signal; a power amplification module is electrically connected to the self-terminating pulse generation module and is used for amplifying the self-terminating driving pulse into a power pulse sufficient to drive the magnetic latching relay coil; and a polarity commutation module is controlled by the internal control instructions of the state switching module and applies the power pulse to the magnetic latching relay coil in a forward or reverse polarity. The application aims to adopt a novel control circuit with single power supply and less MCU resources.

The application discloses a kind of power cable insulation detection and defect evaluation method and system based on frequency-increasing pulse, it includes: obtaining the reflection signal generated by the propagation of frequency-increasing pulse in power cable;Time domain information extraction is carried out to frequency-increasing pulse and reflection signal, obtain the time difference between them, the pulse polarity of reflection signal, amplitude attenuation coefficient;Frequency domain information is extracted from frequency-increasing pulse and reflection signal, the frequency domain information extracted includes signal amplitude-frequency curve correlation coefficient, phase-frequency curve correlation coefficient, power spectral density curve correlation coefficient;Time-frequency domain information is extracted from frequency-increasing pulse and reflection signal;In time domain and frequency domain, the position of defect in power cable is calculated respectively, and the position of intermediate joint in power cable line is combined, to evaluate that defect is located in power cable body or joint;The type and severity of the defect of power cable are evaluated.The application improves the accuracy of defect positioning and evaluation.

This invention discloses an in-memory differential computation method and architecture based on ferroelectric random access memory (RAM). The in-memory differential computation method includes the following steps: pre-setting the correspondence between binary logic and pulse polarity; converting the subtrahend and minuend in the differential operation into corresponding pulse sequences; applying the pulse sequence corresponding to the subtrahend to the storage cell of the ferroelectric RAM to complete subtrahend storage and initial polarization; applying the pulse sequence corresponding to the minuend to the same storage cell of the ferroelectric RAM to trigger ferroelectric domain inversion; and reading the polarization inversion charge generated by the ferroelectric domain inversion in the storage cell of the ferroelectric RAM, with the polarization inversion charge directly used as the differential computation result of the subtrahend and minuend. This invention directly uses the polarization inversion charge as the differential result, achieving the integration of storage and computation, and significantly improving the efficiency of differential computation and energy utilization efficiency.

The invention relates to a coal mine programmable pulse polarity aerosol charge regulation dust suppression system, and belongs to the technical field of coal mine dust suppression, the coal mine programmable pulse polarity aerosol charge regulation dust suppression system comprises a control unit and an atomization unit in signal connection with the control unit, the atomization unit is communicated with a liquid supply system, and a charge controller comprises a dielectric isolation electrode array and a low-energy high-voltage pulse generator. The programmable pulse power supply is electrically connected with the control unit, the atomization unit, the dielectric isolation electrode array and the low-energy high-voltage pulse generator, a transient high electric field is formed at an outlet of the atomization unit, the dielectric isolation electrode array enables the electric field to be coupled to the surfaces of fog drops, the surfaces of the fog drops are polarized, charges are obtained, and the fog drops are atomized. The polarity of charges on the fog drops is opposite to that of pulverized coal particles, coupling sedimentation is achieved through mutual attraction of the fog drops and the pulverized coal, the charging mode of near-field medium coupling or pulse induction is adopted, the hidden danger of sparks caused by ionization through continuous high voltage can be avoided, and the dust suppression safety of a coal mine operation area is improved.