475 results about "Current generator" patented technology

Disclosed herein are systems and methods for electrically modulating tissue. Systems can include a current generator; at least one implantable working electrode, the at least one implantable working electrode configured to be in electrical communication with the current generator; at least one indifferent electrode; and a controller configured to signal the current generator to: generate a set of currents with a set of initial polarities to be delivered to the working electrodes; and wherein the at least one indifferent electrode absorbs a bias current which is equal in magnitude and opposite in polarity to a summation of the set of currents.

A half-bridge driver circuit periodically repeats switching cycles by closing a first FET via a first drive signal, detecting an instant when a current flowing through the first FET reaches a threshold and then opening the first FET and closing a second FET via a second drive signal. An error amplifier generates a control voltage by comparing a feedback signal with a reference signal, and a variable current generator generates a first current as a function of the control voltage. The error amplifier includes a proportional-integral controller, and a slope compensation circuit that generates a second current as a ramp signal. The threshold is generated by subtracting the second current from the first current. In response to detecting the instant, the second current is sampled and a signal indicative of the threshold is generated by subtracting the sampled second current from the first current.

The invention relates to the technical field of transformers, and discloses a transformer with dustproof and moistureproof functions. Comprising a rotary dust removal mechanism, a variable-frequency heating and dehumidifying mechanism, an induction coil which is fixedly mounted in a second gas flowing cylinder and cooperates with a high-frequency current generator to generate an alternating magnetic field phenomenon, and a metal rod which is mounted in the center of the induction coil and generates a heating phenomenon after being influenced by the alternating magnetic field. According to the transformer with the dust-proof and moisture-proof functions, the dust-proof effect can be achieved on gas entering the transformer protection cabinet, the filter cover used for dust removal rotates at a high speed, the gas attached to the outer surface of the filter cover can be thrown away by centrifugal force, and therefore the normal working time efficiency of the filter cover is guaranteed; the device can perform a heating dehumidification effect on dedusted gas, so that humid gas is prevented from entering a transformer protection cabinet, the working environment of a transformer is improved, and the effective service life of the transformer is prolonged.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

A dimming method is to be implemented by a brightness divider, and includes steps of: (A) determining whether a brightness value is smaller than or equal to a predetermined reference value; (B) when it is determined in step (A) that the brightness value is smaller than or equal to the predetermined reference value, setting a magnitude value that is related to a current generator, and setting a pulse width value that is related to a switch based on the brightness value; and (C) when it is determined in step (A) that the brightness value is not smaller than or equal to the predetermined reference value, setting the magnitude value based on the brightness value, the predetermined reference value and a predetermined order setting, and setting the pulse width value based on the predetermined reference value.

The invention relates to a generation power control method, device and equipment of a slope type gravity energy storage system, a storage medium and a program product, and relates to the technical field of gravity energy storage. By adopting the method, the generated power stability of the slope type gravity energy storage system can be improved. The method comprises the following steps: according to power generation request power and unit output power of the slope type gravity energy storage system, determining the current demand number of generator sets; the current generator set is a power generation device comprising two rails; selecting a target number of trucks to be in place on a high-altitude platform of the slope type gravity energy storage system according to the demand number of the current generator set; in response to a power generation starting signal of the slope type gravity energy storage system, according to the truck acceleration control principle, a variable parameter mode is adopted, and the truck is controlled to slide down at wrong time; responding to a power generation stop signal of the slope type gravity energy storage system, and when it is recognized that all the truck slides down and stops on the low-altitude platform of the slope type gravity energy storage system, power generation is ended.

A pixel includes a light-emitting element, a pulse width modulator controlling an emission time duration of the light-emitting element based on a data voltage, and a constant current generator providing a driving current having a constant level to the light-emitting element based on a constant current generation voltage. The pulse width modulator includes a first driving transistor, and an N-type transistor connected to a gate electrode, a first electrode and a second electrode of the first driving transistor. The constant current generator includes a second driving transistor, and an N-type transistor connected to a gate electrode, a first electrode and a second electrode of the second driving transistor.

The invention discloses a self-adaptive damping controller and a wind power grid-connected system oscillation suppression method thereof, and the method comprises the steps: building a wind power grid-connected system simulation model, obtaining a system closed-loop transfer function, and connecting the damping controller between a wind power plant side and a power grid side; calculating a logarithmic derivative, analyzing impedance characteristics, judging whether the wind power grid-connected system has an unstable oscillation mode or not, and if so, calculating oscillation frequency; carrying out adaptive parameter setting on the damping controller according to the oscillation frequency, wherein the adaptive parameter setting comprises setting of parameters of a band elimination filter, setting of parameters of a band pass filter, setting of the capacity of the damping controller and setting of parameters of a phase shift link; a current reference signal is generated through the subsynchronous damping calculator and then is converted into a three-phase current through the subsynchronous current generator, the three-phase current is injected into a power grid, the impedance characteristic under the oscillation frequency is adjusted, and system oscillation is restrained. Parameters can be adjusted according to the oscillation frequency, complexity is low, implementation is easy, and high efficiency and accuracy of oscillation suppression are met at the same time.

A circuit includes a bias current generator, a temperature compensation circuit, and a Hall effect sensor. The bias current generator has a first input, a second input, a first terminal, and a second terminal. The bias current generator includes a resistor circuit having a first terminal and a second terminal coupled to the first terminal and the second terminal of the bias current generator respectively. The temperature compensation circuit has a first input, a second input coupled to the first input of the bias current generator, and an output coupled to the second input of the bias current generator. The Hall effect sensor has a first terminal coupled to the first terminal of the bias current generator, a second terminal, a third terminal, and a fourth terminal.

The invention relates to the technical field of generator control, and discloses an emergency control method, device and equipment for a generator set controller and a medium, the same generator set at least comprises two generator controllers, the method is applied to any current generator controller in the generator set, and the method comprises the following steps: determining whether a target generator controller has a fault or not; the target generator controller is another generator controller in the generator set; if the target generator controller breaks down, power supply of the target generator controller is cut off, and input of a first current and voltage signal and output of a control signal based on a target generator are conducted; and accessing the first current and voltage signal, and carrying out parallel operation control on the target generator and the current generator. According to the invention, the generator controlled by the faulty generator controller can be restarted to solve related faults caused by the faulty generator controller, and the normal generator controller automatically carries out parallel operation control on all generators without manpower, so that the operation reliability of the system is improved.

The invention relates to a composite function converter suitable for a multi-phase high-speed permanent magnet direct-current generator. An uncontrolled rectifier bridge arm is formed by connecting two high-frequency rectifier diodes in series; the controllable rectifier bridge arm is formed by connecting two IGBTs (Insulated Gate Bipolar Translator) with antiparallel diodes in series; an upper tube IGBT collector of the controllable rectifier bridge arm and a cathode of an upper tube diode of the uncontrolled rectifier bridge arm are connected in parallel with an anode of the intermediate bus capacitor; the emitting electrode of the lower tube IGBT and the anode of the lower tube diode of the uncontrolled rectifier bridge arm are connected in parallel with the cathode of the intermediate bus capacitor; the emitting electrodes of the upper tubes IGBT of the controllable rectifier bridge arms are respectively connected to the output end of the generator; the anodes of the upper diodes of the uncontrolled rectifier bridge arms are respectively connected to the other output ends of the generator; the interleaved BUCK module is connected between the intermediate DC bus capacitor and the load, and the BUCK control unit is used for controlling the interleaved BUCK module to operate; and the barring control unit is used for controlling the controllable rectifier bridge arm to realize a generator barring function.

A circuit includes a supply node receiving a supply voltage; an output node providing a regulated voltage; startup circuitry coupled to the supply node; current generator circuitry coupled to the startup circuitry and producing a current; a bandgap node coupled to bandgap circuitry to receive a bandgap voltage; multiplier circuitry coupled to the bandgap node and the current generator circuitry to receive and apply scaling to the current; a first transistor providing a threshold voltage drop across the first and second transistor nodes; a first resistive element interposed between the first transistor and the bandgap node; a second resistive element coupled between ground and the second node of the first transistor; and an operational amplifier receiving a pre-regulated voltage as a function of the bandgap voltage, the threshold voltage across the first transistor, and a voltage drop across the first and second resistive elements.

A current generated cleaning device in accordance with the present invention comprises: a power source, a conductor, a signal generator controller, a current output head, a current generator module, an inlet module, an outlet module, a self-erected water container, and a vertical support frame, the current generated cleaning device use current generated from the current generator module to perform the cleaning and washing of clothes or objects.

The invention relates to the field of power system equipment detection, in particular to a residual magnetism measuring device and method for a large power transformer. The residual magnetism measuring device for the large-scale power transformer comprises the large-scale power transformer, a high-voltage bushing, a high-voltage neutral point bushing, a low-voltage bushing, an iron core outgoing line bushing, a first capacitor, a second capacitor, a detection impedor, a partial discharge instrument and a large-current generator, the capacitance of the first capacitor is 30pf-40pf and is matched with the capacitance of a transformer iron core, and the capacitance of the second capacitor is 300pf-400pf and is 10 times proportional to the capacitance of the first capacitor; the method comprises the following steps: carrying out a long-time induction withstand voltage and partial discharge test after a conventional test, measuring discharge amounts Q1, Q2 and Q3 at 0.5, 1 and 1.5 times of rated voltages, judging residual magnetism according to the difference value of the discharge amounts and an iron core grounding current, and if the residual magnetism exceeds the standard, magnetizing and demagnetizing by using a large current generator at the frequency of 150Hz. The method has the advantages that the residual magnetism is measured and evaluated in time, equipment faults are avoided, operation is easy and convenient, and adaptability is high.

Control circuit for a current source converter having a current generator comprising an inductance (2) and having two or more half bridges each half bridge having an upper leg provided with an upper switching device (11, 13) and a lower leg provided with a lower switching device (12, 14), said upper legs switching devices and said lower legs switching devices being controlled by a controller (40) to provide an overlap between an upper leg turning off and an upper leg turning on switching device and to provide an overlap between a lower leg turning on switching device and a lower leg turning off switching device through gate pull up and gate pull down pulse signals to gate drivers buffers (6) of said switching devices, where said gate driver circuit comprises: - for each switching device (11, 12, 13, 14) a gate current mirroring circuit (5) on a sink branch of the gate driver buffer (6) of such switching device (11, 12, 13, 14) to provide a gate pull down detection signal (Im) from a turning OFF switching device, - for each switching device (11, 12, 13, 14) a gate command connection path to provide a gate command signal (G), at least one logic circuit combining a gate command signal (G) of a first upper or lower leg switching device and a gate pull down signal of a respectively second upper or lower leg switching device to provide a first protection trigger signal (Pr), when said gate command signal of said first upper or lower leg switching device and said gate pull down detection signal of said respective second upper or lower leg switching device correspond to both said first and second upper leg switching devices or both said first and second lower leg switching devices being OFF; converter having such a control circuit.

The invention discloses a partial discharge signal noise processing method and device, terminal equipment and a computer readable storage medium, and the method comprises the steps: obtaining a to-be-processed partial discharge signal, extracting a high-frequency component and a low-frequency component of the to-be-processed partial discharge signal, inputting the high-frequency component and the low-frequency component into a trained noise separation model, and generating a noise signal; performing noise reduction on the partial discharge signal according to the noise signal; wherein the model is determined by the following steps: initializing an adversarial generative network, and inputting a plurality of training samples for iterative training; during each training, inputting a high-frequency component and a low-frequency component of a sample into a generator to generate a false noise signal, inputting the false noise signal and corresponding real noise into a discriminator to generate a discrimination result, and optimizing discriminator parameters according to the discrimination result; calculating an adversarial loss according to a discrimination result of the optimized discriminator; and if the Nash equilibrium is reached, taking the current generator as a final noise separation model, otherwise, optimizing generator parameters according to the adversarial loss.

The invention discloses a portable intelligent temperature control sleeping bag in the field of sleeping bags, which comprises a sleeping bag body, the sleeping bag body comprises an upper-layer covering part and a lower-layer bearing part, the lower-layer bearing part is provided with a control assembly, a current emission assembly and a heating assembly, the current emission assembly is used for emitting micro current, and the heating assembly is used for heating the control assembly. The control assembly is electrically connected with the current emission assembly to control the intensity, frequency and duration of micro-current released by the current emission assembly, the micro-current generator is connected with the electrode through a wire to form an electrical path, the human body makes contact with the electrode, and the micro-current generator transmits the micro-current to the human body through the electrode to achieve micro-current physiotherapy. The heating assembly is used for heating the interior of the sleeping bag body, the control assembly is electrically connected with the heating assembly to control the temperature in the sleeping bag body, the heating assembly further achieves thermal effect physical therapy, and according to different body parts, the power and the temperature adjusting range of the heating assembly are different. Therefore, the requirements of different parts of a human body on warm keeping and thermal effect physical therapy are met.

The application provides a high-voltage direct-hanging energy storage equipment energy storage submodule test system and test method, comprising: a current generator, which generates test current using a cascaded full-bridge structure and can reduce the harmonic content of the output voltage of the current generator based on carrier phase shift or carrier layering modulation; an energy storage submodule to be tested; a current controller for controlling the current generator to adjust the test current; a submodule controller for controlling the energy storage submodule to be tested to adjust the state of charge and voltage of the submodule; and an energy storage system parameter model for outputting reference signals for current control and state of charge control to the current controller and the submodule controller, respectively. The application can test the energy storage submodule in accordance with the actual system operation condition without building a complete energy storage system and effectively reduces the requirements of the test circuit for the switching frequency of the power semiconductor device, the filter and the direct current power supply.

The invention relates to the technical field of electronics, and discloses a pneumatic and wake flow characteristic measurement system, method, device and equipment of a wind turbine, the system collects pneumatic data of the wind turbine through a pneumatic measurement module, and the system collects voltage data of a direct current generator and current data in a circuit through a power measurement module; the particle image velocity measurement module collects a flow field image of the wind turbine in a wake flow area. The data acquisition and analysis module serves as a data center, is connected with the pneumatic measurement module, the power measurement module and the particle image velocity measurement module, supports multi-channel synchronous triggering, and can receive pneumatic data from the pneumatic measurement module and voltage data and current data from the power measurement module at the same time. And a flow field image of the particle image velocity measurement module. Therefore, the consistency of different types of data in acquisition time is ensured, a basis is provided for subsequent synchronous analysis, and simultaneous and synchronous testing of pneumatic and wake flow parameters of the wind turbine is realized.

A DC / DC converter including a low side and a high side is disclosed. The converter includes a first switching device being part of the low side, a low side current generator configured to generate a low side current flowing in the first switching device, a second switching device, a compensation resistor coupled in series to the second switching device, a valley current reference current generator configured to generate a valley current threshold current (Ivalcl<sub2>th< / sub2>) flowing in the second switching device and in the compensation resistor for obtaining a first voltage value, and a comparator configured to compare the first voltage value and a reference voltage for generating an error signal as a function of the comparison, the error signal controlling a conductivity of the first switching device of the low side.

Control circuit for a current source converter having a current generator comprising an inductance (2) and having two or more half bridges each half bridge having an upper leg provided with an upper switching device (11, 13) and a lower leg provided with a lower switching device (12, 14), said upper legs switching devices and said lower legs switching devices being controlled by a controller (40) to provide an overlap between an upper leg turning off switching device (11, 13) and an upper leg turning on switching device (13, 11) and to provide an overlap between a lower leg turning on switching device (12, 14) and a lower leg turning off switching device (14, 12) through gate pull up and gate pull down pulse signals to gate drivers buffers (6) of said switching devices, said gate driver circuit comprising: - for each upper leg switching device and each lower leg switching device (11, 12, 13, 14) a gate current mirroring circuit (51) on a source branch of the gate driver buffer (6) of said switching device (11, 12, 13, 14) to provide a gate pull down signal (Gpx, Gpy) upon turning OFF of said switching device, said gate pull down signal (Gpx, Gpy) being connected to a control line (Cl) of a gate buffer (6) of a respective further upper leg switching device or further lower leg switching device (11, 12, 13, 14), - for each upper leg switching device and each lower leg switching device (11, 12, 13, 14) a positive gate command connection path (G+) from a positive gate command output of a pre-driver (7) to provide a reset signal (RSTx, RSTy) for a respective further upper leg switching device and lower leg switching device (11, 12, 13, 14) gate pull down signal.

The invention discloses a test method for a strain clamp, and the method comprises the steps: carrying out the crimping and drainage plate assembly of the strain clamp, and fastening a bolt on a drainage plate to a preset initial torque value through a digital display torque wrench; measuring the contact resistance of a drainage plate of the strain clamp; arranging a T-shaped thermocouple at a monitoring point position of the strain clamp; sequentially applying currents with different percent calculated current-carrying capacities to the strain clamp through a large current generator, and recording transient temperature rise data corresponding to each monitoring point position; and measuring the contact resistance and transient temperature rise data under different bolt torques under the current of each percentage calculation current-carrying capacity. According to the invention, the actual working state of the strain clamp under different drainage plate assembly conditions can be simulated, the bolt torque of the strain clamp is taken as an independent variable, the contact resistance between the drainage plates under different torques is measured, and the overall temperature distribution of the clamp is measured through the temperature measurement probe, so that the test accuracy is improved. Therefore, real-time measurement of three kinds of data of bolt torque, contact resistance and wire clamp temperature rise is realized.

The invention discloses a high-precision dynamic compensation method and circuit for I / O electric leakage, and the method comprises the steps: monitoring the voltage of an I / O port in real time through an I / O voltage detection module, precisely sampling the electric leakage current through an I / O electric leakage sampling module, and carrying out the processing through an electric leakage monitoring resistor network, an electric leakage monitoring module, a voltage-to-current generator module and the like. The electric leakage direction is determined by the electric leakage current direction judgment detector, and finally the I / O electric leakage dynamic compensation module outputs adaptive current to compensate electric leakage. In addition, parameters can be adjusted through a specific model formula, accurate compensation of electric leakage under different conditions is achieved, the problems of I / O electric leakage direction detection, dynamic monitoring, compensation and the like can be effectively solved, digital and analog function multiplexing at the same I / O port is achieved, the performance of an analog circuit sensitive to I / O electric leakage is improved, and the advantages of high precision and dynamic compensation are achieved.

The invention discloses a micro-current electrical stimulation medical device and a sleep regulation and control system, and relates to the technical field of micro-current stimulation nerve regulation. The device comprises a controller and a current generator, and an earplug main body which is provided with a first stimulation electrode which is in contact with the auricle and is used for outputting a transcranial micro-current stimulation signal through the auricle; the earplug accessory extends towards the direction of the antihelix feet based on the earplug main body, the earplug accessory has compliance and can be matched with the shape of the antihelix, and the far end of the earplug accessory is clamped and fixed in the triangular nest between the antihelix feet; a second stimulating electrode is arranged on the earplug accessory, is in contact with the antihelix foot and / or the triangular fossa and is used for outputting a percutaneous micro-current stimulating signal through the antihelix foot and / or the triangular fossa; and the anti-falling structure is used for fixing and limiting the earplug so as to form resistance for separating the first stimulating electrode and the second stimulating electrode from the ear skin. According to the invention, safe and reliable composite micro-current stimulation can be provided.

Radio-frequency (RE) microneedling skin resurfacing systems are described including an electrode with an array of partially insulated needles, where the needles' exposed tips conduct bipolar RF electric current into a patient's skin, thus enhancing collagen production that stretches the skin. The electrode is carried by an application handle, which connects to an RF current generator. The applied treatment cycles utilize vacuum to pull the skin against the needles and dielectric coolant to cool the epidermis. The needles' array penetrates the skin to a pre-determined depth inside the dermis layer, followed by a sequential delivery of RF bipolar current pulses. The treatment cycle is controlled by an algorithm, designed to raise the dermis layer temperature for a certain duration. The treatment cycle and algorithm rely on dynamic impedance measurements and temperature measurements by thermistors to assure optimized controlled heating of the dermis layer to a target temperature between 45 and 69°C.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.

A comparator circuit with dynamic hysteresis. A common source branch is configured to conduct a differential current at first and second intermediate outputs responsive to a differential input at first and second inputs, and a common gate branch is configured to generate a voltage at a third intermediate output responsive to the differential current at the first and second intermediate outputs. A hysteresis branch includes a hysteresis current generator including first and second replica transistors having source / drain paths coupled in parallel, and gates coupled to the first and second inputs, respectively. A hysteresis capacitor is coupled between the sources of the first and second replica transistors and the common terminal. Current mirror circuitry is coupled to the source / drain paths of the first and second replica transistors, to supply a hysteresis current responsive to the absence of current conducted by the parallel first and second replica transistors.

The invention relates to a half-bridge driver circuit, a related integrated circuit, a half-bridge circuit and a method. A half-bridge driver circuit periodically repeats a switching cycle by closing a first FET via a first drive signal, detecting a moment at which a current flowing through the first FET reaches a threshold, and then opening the first FET and closing a second FET via a second drive signal. The error amplifier generates a control voltage by comparing a feedback signal with a reference signal, and the variable current generator generates a first current according to the control voltage. The error amplifier includes a proportional-integral controller and a slope compensation circuit that generates a second current as a ramp signal. The threshold value is generated by subtracting the second current from the first current. In response to detecting the instant, a second current is sampled and a signal indicative of a threshold is generated by subtracting the sampled second current from the first current.

The utility model relates to the technical field of ultrasonic milling, and discloses handheld ultrasonic milling equipment which comprises a base, a milling mechanism is arranged at the top of the base, a placing mechanism is arranged on the front side of the milling mechanism, the milling mechanism comprises a high-frequency current generator, the high-frequency current generator is fixedly connected to the top of the base, and the placing mechanism is arranged on the front side of the milling mechanism. The left side of the high-frequency current generator is connected with a signal line in an inserted mode, the left side of the signal line is fixedly connected with a transducer handle, and the left side of the transducer handle is connected with a tool bit in an inserted mode. Various materials with different hardness can be rapidly and accurately cut, meanwhile, the quality and safety of a cut section can be guaranteed, due to the fact that ultrasonic vibration is adopted, the surface, making contact with the materials, of the tool bit generates high-frequency vibration, the materials are rapidly cut, and the cutting speed is increased.

A system for efficiently generating or originating a tailored electromagnetic (EM) wave having a lower velocity than the speed of electromagnetic waves in free space includes a coaxial waveguide which extends linearly and a sinewave current generator. The coaxial waveguide includes a tubular outer body and a tailored emitting antenna disposed coaxially within the tubular outer body. The tubular outer body is formed of a first conductive material and defines a space therein which may be maintained as vacuum. The tailored emitting antenna is constructed physically and electrically by at least three phase-shifted sub-antennas connected in series, each of the sub-antennas being formed of a second conductive material which is less conductive than the first conductive material. The sinewave current generator generates multiple phase-shifted sinewave currents which are respectively input to the sub-antennas.