457 results about "Volt" patented technology

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.

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 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 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.

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 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.

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.

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.

A voltage tester system / device for safety application in AC & DC electrical systems and method thereof. The system / device includes a voltage presence indicator (VPI) circuit including plurality of zener diodes, bi-directional current-limiter circuits, VPI-LEDs and an absence of voltage tester (AVT) circuit including plurality of comparator circuits, optocouplers, DC-DC converters, microcontroller, power-management circuit, battery, LEDs and diodes. The VPI circuit converts electrical energy potential between the lines in range of 3 to 3394 volts (phase to neutral) / 5.2 to 5879 volts (phase to phase) into electrical inputs that drives VPI-LEDs to produce light output. The AVT circuit helps in checking circuit wires intactness with their respective busbars and verify absence of hazardous voltage by providing positive indication with a GREEN-light when safe voltage level is attained at connected leads, and voltage is less than a preset threshold value.

A power supply system including a housing, an internal non-removable battery, an output, a power converter, and an electronic processor. The internal non-removable battery received in the housing and having a nominal voltage of at least 12 Volts. The output provided on the housing. The power converter coupled between the internal non-removable battery and the output. The power converter including a first switch. The power converter also converts power received from the internal non-removable battery. The electronic processor coupled to the power converter and controls operation of the power converter by controlling the first switch at a switching frequency of at least 100 kHz.

A method for seamlessly traversing a non-linearity on a mode transition boundary of a power converter capable of operating in at least two distinct modes with distinct switching configurations may include maintaining a volt-second balance for the power converter across the mode transition boundary and maintaining an approximate capacitor charge balance for the power converter across the mode transition boundary.

The invention discloses an atmosphere plasma generator, which comprises a driving power supply and a spray gun, and is characterized in that the driving power supply comprises a rectifier, at least two half-bridge inverters and at least two transformers in one-to-one correspondence with the half-bridge inverters; the input end of the rectifier is connected with an AC power supply; the at least two half-bridge inverters are arranged at the output end of the rectifier in parallel; the primary side of each transformer is connected with the output end of the corresponding half-bridge inverter, the secondary sides of the multiple transformers are connected in series to form an output port, and the output port is connected with the spray gun. According to the atmospheric plasma generator, the specification requirement on a single related power device is reduced, so that higher total power output can be realized, the requirement of equipment such as the plasma generator on high voltage of several kilovolts can be met, and the controllability and adaptability of voltage output are improved. And when the power demand is increased, flexible expansion can be realized by increasing the number of the parallel modules, the whole system does not need to be redesigned, and the power expansion capability is improved.

The invention relates to the technical field of electrical variable measurement, in particular to an analysis system for generator parallel operation impact data, which comprises a transient signal acquisition module for synchronously monitoring an ampere value of an impact current and a volt value of an impact voltage during generator parallel operation, obtaining an instantaneous reading of a transient electrical signal, and acquiring a transient signal; and the reading is converted into a digital sequence, and a multi-channel transient electrical signal value is recorded to form an original electrical measurement data set. According to the method, the ampere value of the impulse current and the volt value of the impulse voltage are synchronously monitored in the generator parallel operation period, the instantaneous reading of the transient electric signal is obtained and converted into the digital sequence, a high-precision data foundation is laid for subsequent analysis, and the analysis time period of the impulse event is further set based on the original electrical measurement data set; and carrying out synchronous alignment and effective data segment interception on the current and voltage numerical value sequences according to timestamps, and constructing a structured time domain impact data sequence group.

The invention discloses a method for preparing an oxide transistor based on a secondary post-annealing process and application thereof, and belongs to the field of integrated circuit micro-nano electronic devices. According to the method, after the structure of the oxide transistor is prepared, the oxide transistor is treated in a pre-annealing mode, and then secondary annealing treatment is carried out on the oxide transistor. The thermal stability of the oxide transistor can be improved based on the secondary post-annealing process, the carrier concentration of an active film of the oxide transistor prepared by the method is stable, the field effect mobility of the oxide transistor exceeds 60 cm < 2 > / volt.s, and the comprehensive characteristics of the device reach the international first-class level. And the application of the oxide phase inverter can be realized, and the method has wide development prospect and practical application potential. The method has the advantages of simple steps, convenience in operation and low cost.

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.

The invention provides an open-winding permanent magnet synchronous motor predictive current control method based on hybrid pulse width modulation, and the method comprises the steps: calculating a reference voltage vector, dividing voltage vector sectors according to the reference voltage vector, and selecting a non-zero voltage vector and a zero voltage vector in each sector; according to the sector and range where the reference voltage vector is located, selecting a voltage vector which needs to be acted by the double inverters, and calculating the time when each inverter acts on the voltage vector by using a volt-second balance principle; if the action time of the selected voltage vector exceeds the control period, overmodulation processing is carried out, and the voltage vector time is redistributed; if the zero-sequence current is suppressed, the zero-sequence current and the zero-sequence voltage are suppressed by adjusting the action time of the zero-sequence voltage vector. The control performance of the open-winding permanent magnet synchronous motor can be improved, and the zero-sequence current of the open-winding permanent magnet synchronous motor can be suppressed.

The invention provides a superconducting diode and a preparation method thereof. The preparation method comprises the following steps: modulating the high-temperature superconducting Josephson junction device: connecting the first electrode to a power supply, connecting the second electrode and the third electrode to a voltage measuring device, and grounding the fourth electrode; reducing the environment temperature of the high-temperature superconductive Josephson junction device to a preset temperature lower than the superconductive transition temperature; direct current pulse current with a preset pulse signal is applied to the first electrode, so that a volt-ampere characteristic curve of the high-temperature superconducting Josephson junction device has a rectification characteristic; and applying an alternating current with a predetermined microwave signal to the first electrode, so that a voltage step appears on one side of the volt-ampere characteristic curve, and the other side of the volt-ampere characteristic curve is in a superfluid state. The superconducting diode is obtained by carrying out direct current modulation and alternating current modulation on the high-temperature superconducting Josephson junction device, and high rectification efficiency and high working temperature can be achieved.

An electronic device includes a substrate, a first signal line, and a driving circuit. The first signal line and the driving circuit are coupled to each other and are disposed on the substrate. The driving circuit includes at least one switch element and a driving element. The switch element includes a first control end. The driving element is coupled to the first control end to provide a first voltage signal at the first control end. The first voltage signal has a first maximum amplitude. The first maximum amplitude is greater than or equal to 8 volts and less than or equal to 22 volts.

The invention discloses multipurpose electrotherapy equipment, and relates to the technical field of medical instruments, in particular to the multipurpose electrotherapy equipment which comprises a box body, a motor in the box body, a rotating head driven by the motor, a connecting column, a supporting rod, a connector, a piston rod and a power generation plate. After the motor works, the piston rod is driven by the transmission mechanism to reciprocate to impact the power generation plate to generate current. Generated current is transmitted to a current distributor through a current transmitter and a first wire, the current distributor can steplessly adjust output voltage between 6 volts and 25 volts through a current adjusting button according to pathological types, and the current is transmitted to application ends such as a foot pedal through a second wire to be used for electrotherapy. The device is provided with a display screen for monitoring electrical parameters in real time and ensuring treatment safety. The equipment is stable in power generation, the output current can be finely adjusted according to the adaptation period of a patient, the operation is simple and convenient, and electrotherapy requirements of various pathologies can be effectively met.

The invention relates to a multifunctional electric remote control tea tree platform mowing machine which is characterized in that power shafts of four mowing motors form a straight line and respectively penetrate through mounting bin through holes, the power shafts of the first motor and the third motor are sleeved with short shaft sleeves, and the power shafts of the second motor and the fourth motor are sleeved with long shaft sleeves; a motor power shaft penetrates through central holes of the four disc dense-tooth saw blades, then the motor power shaft is sleeved with a shaft sleeve pressing plate, and finally the disc dense-tooth saw blades are screwed and fixed through nuts, five sharp parts are arranged on the edge of an opening of the motor installation bin, three sharp parts are located at the overlapping positions of the adjacent disc dense-tooth saw blades, and the other two sharp parts are located on the outer sides of the disc dense-tooth saw blades at the two ends. The walking speed is controlled, so that the disc dense-tooth saw blade can effectively cut stumps and branches of tea trees. The blocking protruding part in front of the disc dense-tooth saw blade effectively avoids the situation that the tea tree pile branches are cut by the two saw blades at the same time, and the motor is blocked. A 48-volt lithium storage battery is adopted as a power supply, and continuous operation can be carried out for four hours under the normal condition.

This invention discloses a method and device structure for improving the electrical transport properties of etched graphene quantum dots, belonging to the field of low-temperature transport testing technology. The method includes the following steps: fabricating etched graphene quantum dot devices; performing preliminary electrical transport characterization by cooling; and undergoing several cycles of "sample electrode grounding protection – heating to above 200K or room temperature – cooling again – electrical transport characterization" to improve the electrical transport properties of the device, enabling subsequent observation and manipulation of the quantum dot's fine charge stability map. The optimized method of this invention, through several heating and cooling thermal cycles, successfully adjusts the coulomb blocking region of the graphene quantum dots from hundreds of volts towards zero, facilitating the application of a gate voltage. Furthermore, the charge stability map of the two quantum dots is significantly optimized and improved, greatly increasing the yield of etched graphene quantum dot devices. In addition, the optimized method of this invention is simple to operate and has significant effects, making it suitable for widespread application.

The utility model discloses a direct current motor neutral line detection device, which relates to the technical field of direct current motor maintenance and comprises a bottom shell, a display is mounted at the bottom end of the inner side of the bottom shell, a direct current power supply detection module is mounted at the bottom end of the inner side of the bottom shell, and a time control circuit detection module is mounted at the bottom end of the inner side of the bottom shell. With the adoption of the structure, the direct-current power supply detection module, the time control circuit detection module, the display and the voltage detection module are matched with one another to carry out relative detection, when the motor is in a static state, instantaneous direct-current voltage is applied to an excitation loop, and the excitation loop is excited by utilizing the induced electromotive force direction. The electric brush is converted into direct-current positive and negative voltage through the electronic technology, the direct-current positive and negative voltage is displayed on the liquid crystal screen through the displayer, and if the electric brush is located on the neutral line, the voltage value is zero volt, and if the electric brush is not located on the neutral line, the position of the brush carrier is adjusted till the voltage value is zero volt.

The application provides a photovoltaic simulation device. Since two poles of a direct-current power supply module are used as two poles of the photovoltaic simulation device, and the direct-current power supply module is used to simulate the volt-ampere characteristic of a photovoltaic string in a first quadrant, the photovoltaic simulation device can simulate the output of the photovoltaic string. In addition, since the switch module is turned on when the negative pole potential of the direct-current power supply module is greater than the positive pole potential of the direct-current power supply module, and the first preset resistor and the first preset inductor are used to simulate the equivalent resistance and the equivalent inductance of the diode branch respectively, the series branch formed by the switch module, the first preset resistor and the first preset inductor can be turned on when the two poles of the direct-current power supply module appear negative pressure due to the failure of external devices, like each bypass diode in the photovoltaic string, so that the photovoltaic simulation device provided by the application makes the negative pressure characteristic of the photovoltaic simulation device closer to the photovoltaic string.

1. The name of the design product: intelligent inverter (8831). 2. The use of the design product: the design product is used for converting 12-volt or 24-volt direct current into 220-volt alternating current. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention relates to a high voltage semiconductor device with an offset drain. The semiconductor device, such as, for example, a gate-all-around field effect transistor (GAAFET) device, is suitable for operability under higher operating voltage conditions (e.g., 1.2 volts to 3.3 volts). The semiconductor device includes: a first channel formed in a first plane of the semiconductor device; a second channel formed in a second plane, different from the first plane, of the semiconductor device; the drain electrode is formed around the first channel; the grid electrode is formed around the second channel; and the source electrode is formed around the second channel.

The present disclosure includes apparatuses, methods, and systems for pre-decoder circuitry. An embodiment includes a memory array including a plurality of memory cells, decoder circuitry coupled to the memory array, wherein the decoder circuitry comprises a p-type transistor having a first gate, a first n-type transistor having a second gate, and a second n-type transistor having a third gate, and pre-decoder circuitry configured to provide a bias condition for the first gate, the second gate, and the third gate to provide a selection signal to one of the plurality of memory cells, wherein the bias condition comprises zero volts for the first gate, the second gate, and the third gate for a positive configuration for the memory cells and a negative voltage for the third gate and zero volts for the first gate and the second gate for a negative configuration for the memory cells.

The present application belongs to the technical field of household photovoltaic, and particularly relates to a household photovoltaic fault diagnosis method and system, which comprises: collecting the volt-ampere characteristic curve data of a photovoltaic system and synchronous environmental irradiance; extracting at least one volt-ampere characteristic curve parameter, including short-circuit current, open-circuit voltage, maximum power or fill factor; according to the current irradiance, based on a preset dynamic health baseline, judging whether the system has a fault through a first preset rule. The first preset rule realizes fault diagnosis by obtaining a parameter expected health value and comparing it with an actual extracted value. The present application adopts a dynamic health baseline to adapt to environmental changes, combines an efficient parameter extraction algorithm with an intelligent fault judgment mechanism, significantly improves the diagnosis accuracy, reduces false positives and false negatives, and is suitable for low-cost, automated operation and maintenance of household photovoltaic systems.