225 results about "AC - Alternating current" patented technology

A system includes: an alternating current (AC) to direct current (DC) converter (AC-DC converter), the AC-DC converter connectable to a line voltage; and a DC to DC converter (DC-DC converter) connected to the AC-DC converter, the DC-DC converter including: a high voltage buck-boost converter having a secondary side connectable to a high voltage battery; a low voltage buck-boost converter having a secondary side connectable to a low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter, a secondary side connected to a primary side of the high voltage buck-boost converter, and a tertiary side connected to a primary side of the low voltage buck-boost converter.

A health monitor device (1) for monitoring the health and / or one or more vital signs of a user comprises: an attachment means (2) for attaching the health monitor device (1) to a limb or the neck of the user; a sensing means (3) configured to output raw sensor data, the sensing means (3) comprising at least a plurality of electrodes (31) for applying an alternating current to the skin of the user and measuring a voltage across the skin of the user; a processing means (4) configured to produce processed output data from the raw sensor data; and a communication means for sending or reporting the raw sensor data and / or processed output data to one or more further devices. The processed output data comprises at least a first output signal indicative of the respiration of the user.

The utility model relates to charging pile technical field, concretely relates to a layout structure of charging machine. The layout structure includes the cabinet, alternating current input unit, direct current output unit, control unit, AC / DC conversion module, electric body subassembly, control unit, AC / DC conversion module and alternating current input unit set up at the front of cabinet, direct current output unit sets up at the back of cabinet, and control unit, AC / DC conversion module, alternating current input unit and direct current output unit are electrically connected through electric body subassembly between. The front and back separation formula layout effectively isolated the strong and weak electric signal, reduced the electromagnetic interference, and the space separation of input and output port improved the convenience and security of wiring operation, and the electric body subassembly simplified internal wiring to shorten the assembly time, and reasonable space layout is favorable to improve the heat dissipation efficiency, thereby solve the existing charging cabinet because of internal layout unreasonable leads to the technical problem that the heat dissipation performance and assembly efficiency are not good.

This invention provides an AC contactor, wherein a power supply board is arranged above an upper pressure plate, and an insulating support component is provided between the power supply board and the upper pressure plate. A lower pressure plate is arranged below the upper pressure plate, and a bidirectional thyristor is located between the upper and lower pressure plates. Heat sinks are symmetrically arranged on both sides of the bidirectional thyristor. A drive plate electrically connected to the power supply board and the bidirectional thyristor is provided on one side of each of the upper and lower pressure plates. The upper and lower pressure plates are connected to each other by evenly spaced tie rods. The AC contactor provided by this invention, based on a bidirectional thyristor and employing a press-fit structure, features a compact structure, short breaking time, no mechanical wear, and strong current carrying capacity. Furthermore, by controlling the thyristor's turn-on angle, it achieves the system charging function, and can replace the charging contactor and charging resistor functions required in the original system, making it widely applicable.

This invention relates to the field of gear performance testing technology, and more particularly to a gear performance testing system based on mixed metal powder pressing molding, comprising: a testing machine, which includes a rotating component and a support; a defect information acquisition module, including an eddy current probe for acquiring the induced electrical signal generated when the gear under test interacts with an alternating magnetic field and a purging component; a detection module for acquiring the vibration value of the eddy current probe and the dust concentration at a dust concentration sampling point below the eddy current probe; and a control module for determining the current rise slope of the alternating current based on the vibration difference, determining the vertical height of the support based on the overlap between the dust-containing area on the surface of the gear under test during the uniform rotation phase and the corresponding fixed area, and determining the purging duration of the purging component based on the decrease in dust concentration in the dust-containing area within a unit dust monitoring cycle. This invention improves the accuracy of gear performance testing.

The detection system of individual transcranial alternating current stimulation current amplitude threshold and frequency band range relates to the technical field of data identification, recording and processing in medical instrument and meter technology. It comprises: an upper computer which sends stimulation parameters to a stimulator, receives and stores detection information sent by the stimulator; a control keyboard which obtains stimulation sensitivity of an individual under current stimulation and transmits to the stimulator; and the stimulator which adjusts alternating stimulation current parameters, obtains a frequency band range supplement interval in a frequency adjustment stage, adjusts stimulation current amplitude value based on a fuzzy control algorithm according to a frequency band range proportion and stimulation sensitivity in an amplitude adjustment stage, and repeatedly and alternately carries out the frequency adjustment stage and the amplitude adjustment stage until the current amplitude threshold of the individual is detected or the upper limit of test time is reached. The present application is suitable for threshold detection under different frequency bands, and the current amplitude change is improved in two aspects of direction and size, which will improve the practicability and accuracy of the detection system.

A temperature raising system includes an alternating current (AC) generation circuit connected to a power storage battery including one or more power storages and configured to generate an AC current, and a conductive member of a metallic conductor connected between a terminal portion of the power storage and the AC generation circuit or between two or more power storages. The conductive member includes a first path and a second path along which heat is generated by allowing the AC current to flow. The first path has a larger inductance component than the second path.

The application provides an uninterrupted power supply, comprising: a main branch comprising a rectification module and an inversion module; a battery branch comprising a bidirectional power conversion module and a battery; and a controller comprising a charge / discharge controller. The charge / discharge controller is configured to: when an increase in a load amount of the load is greater than a first preset threshold, control the bidirectional power conversion module to perform DC-DC conversion on direct current output by the battery, so that the battery supplies power to the load to meet the increased power requirement of the load, thereby maintaining the output power of the alternating current power supply stable; and when a decrease in the load amount of the load is greater than a second preset threshold, control the bidirectional power conversion module to perform DC-DC conversion on direct current output by the rectification module that exceeds the power requirement of the load, and then charge the battery, thereby maintaining the output power of the alternating current power supply stable.

The application discloses a power-off detection circuit and equipment, wherein the power-off detection circuit comprises a filter circuit, a rectifier circuit, an operational amplifier circuit and a comparison circuit; the filter circuit is used for filtering an input alternating current signal; the rectifier circuit is connected with the filter circuit and is used for rectifying the filtered alternating current signal to output a first voltage signal; the operational amplifier circuit is used for amplifying the first voltage signal to output a second voltage signal; and the comparison circuit is used for comparing the input second voltage signal with a reference voltage signal to output level indication information. The application reduces the output voltage by using the filter circuit at the alternating current input end, increases the isolation capacity, uses the rectifier circuit to stabilize the waveform, reduces the waveform fluctuation range, uses the operational amplifier circuit to amplify the voltage signal, improves the precision and sensitivity, and finally uses the comparison circuit to output the level indication information, so that the voltage abnormal condition can be accurately and quickly detected.

This invention discloses a method and terminal for searching the critical state of cascading tripping in AC / DC hybrid power grids. It creates a probability density function for the environmental indicators of the target energy source, and based on this probability density function, creates an output power function for the target energy source. Based on the output power function, it analyzes and obtains the initial power flow data of the AC / DC system. Based on the initial power flow data, it generates a comprehensive index for determining whether cascading tripping has occurred in the AC / DC system. The objective function is the shortest distance between the current power grid operating state and the node injection power corresponding to the critical state of cascading tripping, and constraints are constructed based on the comprehensive index. The method solves the cascading tripping critical state search model, which includes the objective function and constraints, to determine the critical state of cascading tripping. This invention accurately searches for the initial operating state of cascading tripping closest to the current power grid operating state, improving the ability of AC / DC hybrid power grids to withstand cascading faults.

A motor control device of the present application controls a motor using a detected value of a rotation angle of the motor, based on a measurement result of a magnetic pole position of a magnetic pole position sensor, the motor being driven by a three-phase alternating current and being provided with the magnetic pole position sensor that measures the magnetic pole position of a rotor, in which the motor control device sets any one of the three-phase alternating current when the motor is in a three-phase short circuit as an object phase, compares a current peak time rotation angle that indicates the detected value of the rotation angle when a current value of the object phase is a peak value with a reference rotation angle that indicates the rotation angle when a prescribed current waveform of the object phase is a peak value, and corrects the detected value of the rotation angle based on a comparison result.

The application relates to a probe for detecting a buried pipeline voltage gradient, which comprises a probe main body, a probe head assembly, a locking positioning part, an aviation plug and a switch button; the probe main body comprises an outer pipe and an inner pipe, a part of the lower end of the inner pipe is an installation section, the installation section is located outside the outer pipe, and the probe head assembly is installed on the installation section; the upper end of the inner pipe is located inside the outer pipe, and the upper end of the inner pipe is tightly fixed with the inner side wall of the outer pipe through the locking positioning part; a part of the upper end of the outer pipe is an assembly section, the assembly section and the upper end of the inner pipe are arranged in the respective axial directions and are spaced apart, a sleeve is arranged on the assembly section, and the free end of the sleeve is provided with the switch button; the aviation plug is arranged on a section between the assembly section and the inner pipe of the outer pipe; the probe head assembly is electrically connected with the aviation plug through cables, and the aviation plug is electrically connected with the switch button. The application realizes the collection of alternating voltage gradient and direct current voltage gradient at the same time in the detection outside the buried pipeline, reduces the labor intensity, improves the detection efficiency, and obtains more current pipeline information.

An electric vehicle (EV) comprising a three-phase motor comprising a rotor and a stator, wherein the stator comprises N number of slots, and an inverter, configured to receive a sensed a three-phase current of the three-phase motor, and generate, based on the three-phase current, a three-phase alternating current (AC) voltage. The three-phase AC voltage comprises a harmonic that is associated with a fundamental frequency associated with a speed of a rotation of the three-phase motor. The three-phase AC voltage is fed as input to windings of the three-phase motor and causes the rotation of the rotor.

The present invention relates to the technical field of electromagnetic heating. Disclosed are an electromagnetic heating cigarette device and an electromagnetic heating system. The electromagnetic heating cigarette device comprises: a housing, an electromagnetic coil, a parameter acquisition module, a driving device and a control module; when an alternating current is applied to the electromagnetic coil, a varying alternating magnetic field is generated, the parameter acquisition module acquires the magnetic field strength in a heating cavity, and when the magnetic field strength is less than a preset magnetic field strength, the control module controls, by means of the driving device, the electromagnetic coil to move in the housing until a new magnetic field strength reaches the preset magnetic field strength. It can be seen that in the present application, when the magnetic field strength at the position where a ferromagnetic element in a cigarette is located is less than the preset magnetic field strength, the control module controls, by means of the driving device, the electromagnetic coil to move in the housing until the new magnetic field strength is the preset magnetic field strength, and at this time, the ferromagnetic element in the cigarette is located at the center position of the alternating magnetic field, so as to achieve the maximum heating efficiency of the electromagnetic heating cigarette device and improve the satisfaction of the user experience.

The application discloses the new energy automobile charging technical field, specifically discloses a kind of alternating current and direct current charging seat integrated locking structure, including direct current charging seat, alternating current charging seat and locking mechanism, the locking mechanism includes electronic lock, direct current end locking rod, alternating current end locking rod and connecting rod mechanism, the direct current end locking rod is connected in the ejection end of electronic lock and is set through direct current charging seat, the connecting rod mechanism is connected on direct current end locking rod, the alternating current end locking rod is connected on connecting rod mechanism and is set through alternating current charging seat, the direct current end locking rod of the present application is ejected by electronic lock, can be driven alternating current locking rod synchronous ejection by connecting rod mechanism, simultaneously meet the demand of alternating current end and direct current end lock gun, manufacturing cost is not high, can fully meet the charging demand of new energy automobile.

To reduce the number of parts. [Solution] The power converter 10 comprises a rectifier circuit 20 that rectifies the AC voltage input from the AC power supply PS, and a DAB converter 30. The DAB converter 30 comprises a primary full-bridge circuit 41 having a plurality of primary switching elements Q1 to Q4, a secondary full-bridge circuit 51 having a plurality of secondary switching elements Q5 to Q8, and a control unit 80. The rectifier circuit 20 rectifies the AC voltage input from the AC power supply PS without performing power factor correction operation, and therefore does not need to have a PFC coil for power factor correction operation, thus reducing the number of parts.

The application discloses an iridium oxide modified fluorine-doped tin oxide electrode and a preparation method and application thereof. The electrode comprises a light-transmitting fluorine-doped tin oxide conductive glass substrate and an in-situ attached iridium oxide nano-modified layer. The preparation method comprises the following steps: preparation and aging of a precursor solution, alternating current electrochemical deposition, annealing and cleaning, and laser patterning treatment. The application further discloses a cell impedance sensor organ chip system comprising the electrode and application of the system in in-vitro drug screening. The application utilizes the low cost and light-transmitting property of the fluorine-doped tin oxide and the excellent charge injection capacity of the alternating current deposited iridium oxide nano layer to greatly reduce the interface impedance. The scheme meets the in-situ optical observation, realizes the high-sensitivity biological impedance monitoring comparable to gold electrodes, effectively solves the problems of high cost and complex process of the existing organ chip electrode, and is very suitable for popularization and application as a disposable high-throughput consumable.

The application discloses a high-voltage alternating-current submarine cable grounding system fault current calculation method and system and a storage medium, and steps are as follows: based on Thevenin equivalent theorem, power supply and power consumption equipment are respectively equivalent to impedance and series voltage source combination and load impedance; combined with double-ended grounding characteristics, the submarine cable loop is equivalent to a π type, and a three-phase equivalent circuit is constructed; the fault phase is determined, and the submarine cable is divided into left and right sides at the fault point; based on Kirchhoff's theorem, voltage loop equations are written, and matrix recursive rules are derived combined with double-side elimination principle. The analytical relationship between the power supply side, the short-circuit side submarine cable main section and the fault circulating current is established according to the recursive rules. The fault point current equation is taken as a boundary condition, and the left side sheath fault circulating current distribution is solved. The right side distribution is obtained by repeating the above steps on the right side, and then the whole line distribution of the fault phase is obtained. The method can accurately calculate the circulating current distribution, improve the fault analysis accuracy and efficiency, and provide support for submarine cable operation and maintenance.

Provided is a power conversion device including an inverter circuit, an alternating current conductor, a magnetic sensor that detects a magnetic field generated when an alternating current flows, a first magnetic body and a second magnetic body that face each other with the alternating current conductor and the magnetic sensor interposed therebetween, and a first housing and a second housing formed of an electrically conductive member, the first housing covering one opening of a space sandwiched by the first magnetic body and the second magnetic body, the second housing covering the other opening of the space, and end portions of each of the first magnetic body and the second magnetic body being formed so as to have a distance to the first housing or the second housing that is smaller than a thickness in an arrangement direction of the first magnetic body and the second magnetic body.

A power supply receiving multiple alternating current (AC) power sources is provided. The power supply includes an AC / direct current (DC) converter including a diode circuit connected to multiple AC power sources and a DC / DC converter configured to convert DC power output from the AC / DC converter into DC power for driving at least one DC load and output the DC power, wherein the AC / DC converter is further configured to form a power flow from one AC power source having a highest voltage among the multiple AC power sources.

The application discloses a bidirectional converter device applied to a power supply system of urban rail transit and a control method. The device comprises a transformer, a bidirectional converter, a rectifying unit and a control unit. The transformer, the bidirectional converter and the rectifying unit are connected between an alternating current power grid and a direct current contact net. The rectifying unit is used for converting alternating current of the alternating current power grid into direct current and supplying power for the direct current contact net. The bidirectional converter is used for converting direct current of the direct current contact net into alternating current and supplying power for the alternating current power grid, and is also used for converting alternating current of the alternating current power grid into direct current and supplying power for the direct current contact net. The control unit is used for monitoring contact net voltage of the direct current contact net, determining whether the contact net voltage is higher than a voltage instruction value, and when the contact net voltage is higher than the voltage instruction value, controlling the bidirectional converter to deliver electric energy from the direct current contact net to the alternating current power grid, so as to inhibit continuous rise of the contact net voltage of the direct current contact net. The above scheme can stabilize the voltage of the direct current contact net.

A detector for detecting alternating current (AC) voltage and for detecting direct current (DC) voltage is disclosed. The detector comprises a gripper having a proximal end and a distal end and configured to be held by a user. The detector further comprises a shell coupled to the distal end of the gripper and having a cone-shaped structure. The shell comprises a cover, a sensor plate and at least one illumination unit. The sensor plate is configured to detect a presence of the AC voltage and / or the DC voltage. The at least one illumination unit is configured to illuminate upon detecting the presence of the AC voltage or the DC voltage by the sensor plate.

Provided is a power conversion apparatus including an input circuit generating an input voltage, a buck-boost converter connected to the input circuit, a first full-bridge inverter and a second full-bridge inverter, which are connected to the buck-boost converter, at least one first inductor connected to the first full-bridge inverter, at least one second inductor connected to the second full-bridge inverter, an output circuit connected to the at least one first inductor and the at least one second inductor to generate an alternating current output voltage, and at least one processor configured to apply a first carrier signal and a reference signal to the first full-bridge inverter and applying a second carrier signal and the reference signal to the second full-bridge inverter, wherein the first full-bridge inverter operates based on the first carrier signal and the reference signal, and the second full-bridge inverter operates based on the second carrier signal and the reference signal.

The application discloses a control method and device of a balanced bridge circuit, electronic equipment and a storage medium, relates to the technical field of balanced bridges, and obtains a neutral line voltage deviation value signal; controls the direct current and the alternating current of the neutral line voltage deviation value signal based on at least two control loops, obtains a direct current control signal and an alternating current control signal; adjusts an adjustment coefficient based on the neutral line voltage deviation value signal, and obtains a target adjustment coefficient; fuses the direct current control signal and the alternating current control signal based on the target adjustment coefficient, obtains a target control signal, and controls the balanced bridge based on the target control signal. The control method of the balanced bridge circuit controls the direct current and the alternating current of the neutral line voltage deviation value signal respectively, adjusts the adjustment coefficients of different control signals adaptively, and solves the problem of heating of the neutral line capacitor without affecting the control effect of the original positive bus voltage and the negative bus voltage.

This invention relates to the field of transcranial alternating current waveform control technology, and discloses a method and system for controlling current waveforms based on transcranial alternating current stimulation. The method includes: performing time-frequency analysis of electroencephalogram (EEG) signals using short-time Fourier transform; generating an initial current waveform based on individual neural oscillation characteristics; selecting different stimulation modes to adjust the current waveform according to task requirements; and calculating and dynamically compensating for frequency and phase shifts through real-time feedback. Compared to existing stimulation methods that typically use fixed frequencies and amplitudes, especially under conditions of significant individual differences, it is difficult to achieve precise individualized current waveform control, leading to unstable and poor stimulation effects. This application, through real-time feedback and dynamic frequency, can precisely adjust the frequency and phase of the current waveform according to the actual neural oscillation state of the brain, improving the synchronization between stimulation and brain neural oscillations.