917 results about "Volt" patented technology

An all-solid-state secondary battery including: a cathode including a cathode active material layer; an anode including an anode current collector, and an anode active material layer on the anode current collector, wherein the anode active material layer includes an anode active material which is alloyable with lithium or forms a compound with lithium; and a solid electrolyte layer between the cathode and the anode, wherein a ratio of an initial charge capacity (b) of the anode active material layer to an initial charge capacity (a) of the cathode active material layer satisfies a condition of Equation 1: 0.01<(b / a)<0.5, wherein a is the initial charge capacity of the cathode active material layer determined from a first open circuit voltage to a maximum charging voltage, and b is the initial charge capacity of the anode active material layer determined from a second open circuit voltage to 0.01 volts vs. Li / Li+.

The invention discloses an intelligent online detector for a 10kV lightning arrester, and the detector comprises a data collection module which is used for obtaining a DC volt-ampere characteristic curve of the lightning arrester under different test conditions; the data preprocessing module is used for eliminating the linear or nonlinear trend of the volt-ampere characteristic curve and eliminating abnormal values; the piecewise linear fitting module is used for segmenting the volt-ampere characteristic curve and performing linear fitting on data of each segment to obtain linear parameters of each segment; the parameter optimization and separation module is used for optimizing the piecewise linear fitting result, separating the surface leakage current and the valve plate current data correction and calculation module, and performing correction calculation based on the optimized parameters to obtain key electrical parameters; and the state evaluation and early warning module is used for evaluating the operation state of the lightning arrester according to the corrected electrical parameters and providing early warning information. According to the method, instability caused by high-order derivative calculation can be avoided, and the accuracy and stability of an evaluation result are ensured.

A common-mode voltage suppression method includes: selecting two large and two small vectors with low common-mode voltage magnitudes as basic voltage vectors; writing a volt-second balance equation according to a selected basic voltage vectors, and calculating, an introduced distribution factor of duty cycles of small vectors, initial values of distribution factors of a duty cycle of each basic voltage vector and of small vectors; designing a neutral-point voltage balance controller to obtain and utilize a corrected value of the distribution factor of the duty cycles of the small vectors and the initial values and combine with a set neutral-point voltage balance control threshold to update the duty cycle of each basic voltage vector; and inserting shoot-through states into the small vectors, designing a switching sequence, converting the sequence into a driving signal of a power switch, and controlling an operation of the quasi-Z-source simplified three-level inverter.

The present invention provides a method for cooperatively suppressing a common-mode voltage and current harmonics of coupled three-level inverters, comprising: based on amplitude and phase angle of reference voltage vector, determining sector and region in which the reference voltage vector is located; selecting four basic voltage vectors with low common-mode voltage amplitudes to synthesize the reference voltage vector; writing volt-second balance equation based on selected basic voltage vectors, and calculating duty cycles thereof; and based on sector and region in which reference voltage vector is located, set value of voltage difference across capacitors on direct current side, and actual value of voltage difference across capacitors on direct current side, (1) updating duty cycles of basic voltage vectors, to realize separate control of capacitor voltage; and (2) designing and converting switching sequence into PWM drive signal of power switch, to control the coupled three-level inverter to operate.

Various RF plasma systems are disclosed that do not require a matching network. In some embodiments, the RF plasma system includes an energy storage capacitor; a switching circuit coupled with the energy storage capacitor, the switching circuit producing a plurality of pulses with a pulse amplitude and a pulse frequency, the pulse amplitude being greater than 100 volts; a resonant circuit coupled with the switching circuit. In some embodiments, the resonant circuit includes: a transformer having a primary side and a secondary side; and at least one of a capacitor, an inductor, and a resistor. In some embodiments, the resonant circuit having a resonant frequency substantially equal to the pulse frequency, and the resonant circuit increases the pulse amplitude to a voltage greater than 2 kV.

A method for treating a patient via high-frequency (HF) electrostimulation therapy at an external target body location comprises generating a tonic motor activation (TOMAC) electrostimulation waveform using a power source supplying less than 100 volts zero-to-peak voltage amplitude per phase. The waveform has a frequency of 1,000 Hz to 5,000 Hz, a zero-to-peak current amplitude of 10-50 mA, and a duty cycle greater than 25%. The waveform is configured to overcome skin capacitance, induce proprioceptive afferent activity, and induce sustained tonic motor activation of a muscle. The method involves delivering the waveform to the external target body location over a specified duration during the patient's sleep period and receiving at least one TOMAC efficacy indication. The efficacy indication may relate to sleep efficiency, sleep stage, sleep onset latency, daytime sleepiness, CPAP compliance, or patient physiological response indicating TOMAC.

The invention discloses an alternating-current and direct-current fault protection method of a hybrid commutation converter valve and related equipment thereof, and relates to the technical field of high-voltage direct-current power transmission. The method comprises the steps of obtaining an AC voltage of an AC side, a target trigger angle of a hybrid commutation converter valve and a DC current of a DC side, and determining an extinction angle margin risk factor and a volt-second area margin risk factor according to at least one of the above, the extinction angle margin risk factor being used for representing a commutation success margin, and the volt-second area margin risk factor being used for representing a target trigger angle of the hybrid commutation converter valve; the volt-second area margin risk factor is used for representing the commutation driving capability; determining a commutation failure risk index based on the extinction angle margin risk factor, the volt-second area margin risk factor and the prediction confidence factor; and when the commutation failure risk index is abnormal, controlling and triggering the hybrid commutation converter valve to enter a corresponding commutation enhancement mode or an active turn-off mode based on the commutation failure risk index. According to the embodiment of the invention, active intervention can be carried out before the commutation failure is caused by the AC / DC fault, so that the commutation failure can be fully resisted.

The invention relates to the technical field of diode detection, in particular to a vehicle gauge level diode detection method, which comprises the following steps of: acquiring a plurality of pieces of image information of each view of a diode to construct a spatial model of the diode, and determining the qualification of the spatial form of diode packaging based on the overall fitting degree of the spatial model. And determining the diode packaging qualification based on the straight line contact ratio of the pins. Carrying out preliminary detection by using a universal meter based on the packaged qualified diode, and determining the minimum dynamic resistance based on the volt-ampere characteristic curve of the diode under the condition that the access is qualified so as to carry out preliminary grading on the performance of the diode; and the detection voltage is matched based on the preliminary grading result, the temperature of the diode is monitored in real time in the detection process to establish a temperature fluctuation curve, and the maximum change rate and the change range of the temperature are determined based on the temperature fluctuation curve to determine whether the fluctuation evaluation value is adjusted to re-determine the performance grading of the diode. According to the invention, the performance detection efficiency of the diode is improved.

The invention discloses a modulation method and system for suppressing common-mode voltage and midpoint low-frequency oscillation of a three-level inverter, and the method comprises the steps: obtaining a reference voltage vector, and judging a sector where the reference voltage vector is located according to the division condition of a space sector; according to the space sector division condition and the position of the reference voltage vector, a synthetic virtual vector and a corresponding basic voltage vector are obtained, and the action sequence of the basic voltage vector is determined; based on the action sequence of the basic voltage vector, virtual vector action time is calculated according to volt-second balance, the virtual vector action time is distributed to the basic voltage vector action time, and a pulse width modulation signal is output to control the on-off of a power device of the inverter, so that the common-mode voltage of the three-level inverter is suppressed, and the three-level inverter is obtained. And safe and stable operation of the system is guaranteed.

The invention relates to the technical field of photovoltaic cell testing, and discloses a volt-ampere characteristic curve testing system for a high-power photovoltaic cell. The system comprises a multi-source data acquisition module, a cross-modal feature fusion module, a volt-ampere curve reconstruction module and a dynamic parameter adjustment module. The multi-source data acquisition module synchronously acquires real-time irradiance time sequence data, assembly temperature distribution data and a current and voltage sampling data set of a target photovoltaic array; the cross-modal feature fusion module performs feature interaction processing on the multi-source data to generate a fusion electrical feature matrix; a volt-ampere curve reconstruction module performs dynamic curve fitting based on the matrix to generate a volt-ampere characteristic curve under a standard test condition; and the dynamic parameter adjustment module executes parameter calibration according to the curve and outputs a test parameter dynamic adjustment strategy to the acquisition module. The system can eliminate environmental interference, optimize test parameters, guarantee long-term stable operation, and meet accurate test requirements of high-power photovoltaic cells.

The invention relates to the field of performance testing, in particular to a conductivity testing system for a diode, which draws a volt-ampere characteristic curve of the diode through a data analysis unit according to voltage at two ends of the diode and current flowing through the diode, and calculates the conductivity of the diode according to a fitting value of the volt-ampere characteristic curve and a standard curve. And calculating the conductivity characterization parameter of the diode according to the maximum temperature difference value of the diode image and the thermal image, judging whether to test the conductivity of the diode or not through the conductivity test unit according to the conductivity characterization parameter of the diode, and adjusting the output voltage of the power supply module. According to the invention, the conductivity of the diode is comprehensively represented through a plurality of indexes, so that the accuracy and reliability of the test are improved. The audio frequency in the process of testing the conductivity of the diode is obtained, and whether the conductivity of the diode is abnormal or not is judged by combining the characterization parameters of the conductivity of the diode.

The invention is applied to the technical field of lithium ion batteries, and discloses a non-aqueous electrolyte which comprises the following substances in percentage by weight: 5-20% of electrolyte lithium salt, 70-90% of organic solvent and 2-9% of functional additive, and the functional additive comprises fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene. Compared with classical ethyoxyl pentafluorocyclotriphosphazene, the fluorosulfonyl difluoroacetate pentafluorocyclotriphosphazene has the advantages that sulfonyl and ester groups are added, a correspondingly formed positive electrode electrolyte interface layer (CEI) rich in inorganic lithium salts such as lithium sulfate and lithium fluoride can stabilize an interface between a positive electrode and an electrolyte under high voltage, impedance rise is inhibited, and the service life of the positive electrode is prolonged. And stable circulation of 5V spinel is realized. By introducing the ester group, the lithium salt solubility of the electrolyte can be improved, the solution viscosity can be reduced, the wetting ability can be improved, and meanwhile, the electrolyte has a good flame-retardant effect. Compared with a control group, the battery containing the fluorine sulfonyl difluoroacetate pentafluorocyclotriphosphazene additive electrolyte has better electrochemical performance.

The invention discloses a lightning arrester resistor disc nonlinear conductivity fitting method and system based on a temperature correction coefficient, a medium and equipment, and the method comprises the steps: calculating a current-voltage relation of a lightning arrester according to the volt-ampere characteristic of the lightning arrester and the actual size and material parameters of each component in the lightning arrester, and converting the current-voltage relation into a current density-electric field intensity relation; processing the volt-ampere characteristic interpolation curve in a segmented manner by adopting a logarithm domain processing method and fitting the volt-ampere characteristic interpolation curve; calculating a nonlinear conductivity temperature correction coefficient according to the direct-current reference voltage of the resistor disc of the lightning arrester at different temperatures; calibrating the reference point of the temperature correction coefficient to obtain an equivalent nonlinear conductivity curved surface based on the temperature correction coefficient; performing goodness-of-fit calculation on the obtained equivalent nonlinear conductivity curved surface, and if the goodness-of-fit is relatively high, outputting the equivalent nonlinear conductivity; and if the goodness of fit is relatively low, performing segmentation fitting on the volt-ampere characteristic curve again until the goodness of fit of the equivalent nonlinear conductivity curved surface is relatively high.

In some aspects, the present disclosure provides a rechargeable energy source system. The system can comprise a positive electrode comprising a redox material and having a specific capacity of at least 300 mAh / g. The system can comprise a negative electrode comprising a layer of lithium metal, having a purity level greater than about 90% and a thickness ranging from about 1 μm to about 20 μm. The positive electrode can be configured to maintain a specific capacity for at least 100 charge / discharge cycles between 1.6 and 4.5 Volts at a charge / discharge rate of C / 10 or higher.

The invention discloses a DAB converter backflow power suppression method based on a Runge-Kutta method, and the method comprises the steps: firstly selecting an auxiliary inductance value and an input capacitance value, and constructing a DAB converter; secondly, through volt-second balance and inductive current symmetry, calculating a relational expression between the backflow power of the DAB converter and an intra-bridge shift ratio D1 and a relational expression between the backflow power and an inter-bridge shift ratio D2, obtaining a relational expression between the backflow power and the D1, and establishing a fourth-order Runge-Kutta equation about the backflow power and the D1; and according to a fourth-order Runge-Kutta equation of the backflow power and the D1, solving a global optimal solution and values of the D1 and the D2. And finally, the solved D1 and D2 values are used for PWM wave modulation, and the backflow power is reduced under the condition that the transmission power is not changed. According to the invention, faster dynamic response is realized, and the backflow power is reduced on the basis of not changing the transmission power, so that the heat production is reduced, and the efficiency of the converter is improved.

The invention relates to an external multi-gap lightning arrester volt-second characteristic curve estimation method and device and a medium, and the method comprises the steps: selecting at least two different standard lightning pulses to carry out the lightning stroke test of an external multi-gap lightning arrester test system, and obtaining an initial initial voltage and a corresponding initial lightning stroke damage effect value; constructing each standard lightning pulse voltage-time curve, obtaining a damage effect integral function, and obtaining an initial external multi-gap lightning arrester voltage-time curve in combination with the initial initial voltage and the initial lightning damage effect value; based on the initial voltage-time curve of the external multi-gap lightning arrester, parameter optimization is carried out by utilizing a genetic algorithm, the voltage-time curve of the external multi-gap lightning arrester is obtained, and equipment and a medium are used for realizing the method. Compared with the prior art, the method has the advantages that the volt-second characteristic curve of the external multi-gap lightning arrester is directly estimated by using the genetic algorithm, and the characteristic curve capable of accurately reflecting the influence of the lightning stroke on the power distribution network is obtained through a simple estimation method.

Various RF plasma systems are disclosed that do not require a matching network. In some embodiments, the RF plasma system includes an energy storage capacitor; a switching circuit coupled with the energy storage capacitor, the switching circuit producing a plurality of pulses with a pulse amplitude and a pulse frequency, the pulse amplitude being greater than 100 volts; a resonant circuit coupled with the switching circuit. In some embodiments, the resonant circuit includes: a transformer having a primary side and a secondary side; and at least one of a capacitor, an inductor, and a resistor. In some embodiments, the resonant circuit having a resonant frequency substantially equal to the pulse frequency, and the resonant circuit increases the pulse amplitude to a voltage greater than 2 kV.

A 48-volt electric sprayer machine including a plurality of blowers, each configured to produce an airflow; a plurality of nebuliser nozzles, each to deliver a nebulised product in the airflow produced by the blowers; an electric pump connected to the nozzles and supplies a flow of product to the nebulisers. Each blower is equipped with an electronic controller, connected to the electric motor and configured to control the actuation of the electric motor. Each nebuliser nozzle is equipped with a control solenoid valve, adapted to control the delivery of product. The pump is equipped with an electronic controller; the controllers of the blowers, the control solenoid valves and the controller of the pump are connected with digital transmission to an electronic control unit to control the independent actuation of each thereof, as a function of the conditions of use of the sprayer machine.

The invention provides an electrolyte additive, an electrolyte and a lithium battery thereof. The lithium tetraphenylboride compound additive is prepared by adopting a simple and low-cost process; and the ratio of the solvent to the additive of the electrolyte is optimized, so that the performance of the battery in a high-voltage environment is remarkably improved. Due to the introduction of the electrolyte additive, not only is the chemical stability of the electrolyte enhanced, but also the transmission efficiency of lithium ions in an electrode material is effectively promoted through a solvation structure of anion aggregation; and the lithium salt can also be independently used as a lithium salt in an electrolyte, so that the charge-discharge performance of the battery is improved. Besides, the lithium battery disclosed by the invention is excellent in performance under high voltage, wide in electrochemical window range and capable of adapting to voltage change from 0 to 5.5 volts, and new possibility is provided for development of the high-performance lithium battery.

Disclosed herein is a frame buffer pixel circuit having a first data pass gate transistor G1, first storage capacitor C1, a voltage boosting line Vb, source follower transistor F, pull-down transistor P, and second data pass gate transistor G2. The pull-down transistor P is connected to the drain of transistor F and source of transistor G2 and the storage capacitor C1 is connected to a voltage boosting line Vb. In the operation, Vb is set to zero volt when data is transferring to C1 capacitor through G1 gate. After the frame data are loaded onto C1 capacitors in all pixels, Vb is set to designed voltage and G2 gates in all pixels are opened to charge Clcd capacitors. Vb is then set to zero volt again before starting to load next frame data onto pixels. Such process is iterated in the liquid crystal on silicon (LCOS) working time.

The invention provides a pulse modulation LED dimming system and method based on an STM32 single-chip microcomputer. The system is mainly composed of an STM32F103C8T6-single-chip microcomputer module, an OLED display module, a signal acquisition module, a matrix key module, a Bluetooth module, an LED lamp module and the like. The system method comprises the following steps: step 1, optimizing a hybrid modulation strategy and carrier allocation, and establishing a dynamic carrier frequency allocation model through a multi-mode hybrid scheme fusing pulse width modulation and pulse density modulation; step 2, collecting an LED load current waveform in real time through a current sampling module, dynamically adjusting a gain coefficient based on a harmonic distortion rate, and counteracting a main harmonic component of a current signal in real time; and step 3, implementing nonlinear compensation of volt-ampere characteristics. The system supports 0%-100% stepless dimming, brightness adjustment is smooth and flicker-free, the system has four dimming modes of normally-on, single-point, circulating and sliding, matrix key local control and Bluetooth remote control are supported, and a flexible and stable LED dimming scheme is provided for a user.

The invention provides a water environment heavy metal pollution measuring method based on electrochemical analysis. The method comprises the following steps: constructing a linear coefficient comparison set and a constant term comparison set of peak current and concentration of heavy metal ions on a certain stripping volt-ampere peak potential by aiming at different samples in a water environment detected sample set of a certain heavy metal; and then, by constructing a water environment similar sample set of the to-be-measured sample for heavy metal pollution measurement, the measurement concentration of the to-be-measured sample about the heavy metal ions is given. According to the technical scheme provided by the invention, the to-be-detected water environment sample is matched according to the data of a certain heavy metal ion of the detected water environment sample in the past, so that the adaptability of rapidly detecting the heavy metal ions of different water environment samples through the electrochemical detection device is enhanced.

An electrical combination, a tool system, an electric motor, a battery pack, and operating and manufacturing methods. The tool may include a tool housing, a motor supported by the tool housing, the motor having a nominal outer diameter of up to about 80 millimeters (mm), the motor being operable to output at least about 2760 watts (W), and a tool terminal electrically connected to the motor; a battery pack including a pack housing defining a volume of the battery pack, the volume being up to about 5.2×106 cubic millimeters (mm3), battery cells supported by the pack housing, the battery cells being electrically connected and having a nominal voltage of up to about 80 volts (V), and a pack terminal electrically connectable to the tool terminal to transfer current between the battery pack and the tool; and a controller operable to control the transfer of current.

A power converter incorporating a synchronous rectifier implements adaptive turn-off voltage control for fast turn-off of the synchronous rectifier in the continuous conduction mode. In some embodiments, the synchronous rectifier turn off detection threshold is adaptively changed as a function of the detected operation mode of the power converter. In response to detecting the power converter being operated in the continuous conduction mode, the synchronous rectifier turn off detection threshold is set to a voltage value farther away from zero volt as compared to the nominal turn off detection threshold. In this manner, the synchronous rectifier can be turned off earlier while in the continuous conduction mode. When the synchronous rectifier can be turned off quickly, large reverse current or negative current as well as large drain voltage spike at the synchronous rectifier can be avoided. The reliability of the synchronous rectifier and the power converter is improved.

The utility model relates to the technical field of extra-high voltage direct current transmission equipment, in particular to a GIS basin-type insulator particle motion device based on photon counting measurement, which comprises a power supply unit, a partial discharge-free transformer, a measuring unit, a recording unit, a counting unit and a data acquisition control unit, the power supply unit is used for providing excitation voltage of an initial DC / AC excitation volt level, and is connected with the non-partial-discharge transformer to amplify the excitation voltage and then is connected with the measurement unit. The measuring unit is used for measuring a GIS basin-type insulator sample to be measured; the recording unit is used for recording the movement process of the to-be-tested GIS basin-type insulator sample particles in a time period from a static state to a movement starting state; the device is simple in structure and convenient to use, is not affected by electromagnetic noise and vibration noise during traditional partial discharge measurement in use, is higher in particle detection sensitivity compared with a traditional partial discharge detection device, and can realize online detection of GIS basin-type insulator particle motion.

The utility model provides a flyback converter and a primary state detection circuit thereof, in a detection interval, when a drain terminal voltage of a synchronous rectifier is greater than an output voltage, integration is carried out from zero based on a difference value between the drain terminal voltage and the output voltage to obtain a first volt-second integral; the volt-second integral judgment module compares the first volt-second integral with a preset integral threshold value and outputs a first judgment signal; the pulse signal generation module generates a first short pulse signal and a second short pulse signal at the starting moment and the ending moment of a detection interval respectively; the pulse counting module counts pulses based on the first judgment signal, the first short pulse signal and the second short pulse signal and outputs a first count value; the synchronous rectifier driving control module judges that the flyback converter primary stage is in a fault state based on the first count value; and when the flyback converter is in the primary fault state, stopping driving the synchronous rectifier. By means of the arrangement, when the primary stage breaks down, the common phenomenon of the primary stage and the secondary stage can be avoided.

A control circuit and a control method for a flyback converter, and switching power supply are disclosed. The secondary side control circuit includes a volt-second acquisition unit and a volt-second determination unit. The volt-second acquisition unit calculates the volt-second product of the voltage across the secondary winding. The volt-second determination unit compares the volt-second product with a volt-second threshold to determine the communication status between the primary side control circuit and the secondary side control circuit. This detection process achieves a handshake between the primary and secondary sides and enables precise control of the primary side by the secondary side without the need for additional isolators, reducing circuit cost and loss.

The invention discloses a common-mode voltage suppression and neutral-point voltage self-balance control method for a parallel NPC type three-level inverter system. The method comprises the following steps: (1) constructing a parallel NPC type inverter system structure model based on an NPC type three-level inverter; (2) determining a three-phase reference voltage vector in the three-phase static coordinate system according to a three-phase sine wave needing to be output, and converting the reference voltage vector in the three-phase static coordinate system into an alpha-beta coordinate system; (3) determining a sector where the vector is located and an area where the vector is located according to the amplitude of the reference voltage vector in the alpha-beta coordinate system and an included angle between the reference voltage vector and the alpha axis; (4) selecting a corresponding zero common mode basic vector combination according to the large sector and the small sector where the reference voltage vector is located and in combination with the basic output voltage vector; (5) calculating the action time of the basic vector in each sector; (6) distributing a basic vector action sequence according to a volt-second balance principle to realize neutral-point potential balance; according to the invention, common-mode voltage suppression and neutral-point voltage self-balancing are realized.

Systems and methods for electroporation are provided. An electroporation system includes a catheter assembly including a first electrode, a second electrode, and a pulse generator coupled to the first and second electrodes. The pulse generator is configured to apply a waveform between the first and second electrodes to perform irreversible electroporation, wherein the waveform includes pulses having a voltage amplitude of 1000 Volts (V) or less and an effective pulse width of 10 microseconds (μs) or more.

The invention provides a resonance suppression method for a three-phase PWM (Pulse Width Modulation) rectifier with an LCL (Lower Control Limit) filter, which relates to a three-phase PWM rectifier control technology, and is characterized in that on the basis of vector control of power grid voltage orientation, voltage and current sampling is carried out at fixed time intervals, inner loop control is implemented, and on the premise of ensuring volt-second balance in a pulse width modulation process, namely, a PWM process, the voltage and current are sampled at fixed time intervals, so that the resonance suppression efficiency is improved. And the sampling period is minimized. According to the method, the sampling frequency is increased, the system bandwidth is improved, and resonance suppression can be achieved under the low carrier frequency when main circuit parameters are not matched.