97 results about "Pulse operation" patented technology

A system of adjusting the phase of a user's circadian rhythms, said system comprising: a high EML light source configured for delivering pulsed high EML light in a pulsed mode of operation, wherein the pulsed high EML light has a frequency and intensity sufficient to effect circadian phase adjustment in said user, and secondary functionality comprising transmitting electromagnetic radiation (EMR) to said user.

This power conversion device includes a multilevel inverter which outputs multilevel voltages by adding / subtracting voltage of a sub inverter to / from output voltage of a main inverter. The multilevel inverter can switch between PWM operation in which plural pulses are outputted in each of positive voltage output and negative voltage output in one cycle and a pulse width is controlled, and one-pulse operation in which one pulse is outputted in each of positive voltage output and negative voltage output in one cycle, and has a current-split switching mode in which current flowing between a neutral point and the sub inverter flows through a first switch group and a second switch group provided to the main inverter and connected in parallel, in a case where the main inverter outputs zero voltage which is the potential of the neutral point, in the one-pulse operation.

Disclosed in the present invention is a near-infrared wavelength scanning pulse fiber laser having a low mode-locking threshold. According to the present invention, a nonlinear amplifying loop mirror and a saturable absorber mirror architecture are used to achieve a low mode-locking threshold and ensure long-term mode-locking stability. After mode-locking self-starting, an automatic control module automatically achieves single-pulse operation by adjusting the intensity of retro-reflected pulses. In the single-pulse operation stage, different frequencies of radio frequency signals and different signal intensities are provided for an acousto-optic tunable filter by means of a radio frequency module to achieve a 1030 nm-1100 nm wavelength scanning and tuning range.

The present application provides a wave shaping circuit of a laser driving circuit, a laser driving circuit and a laser device, by attenuating the wave at the start of the pulse to a lower power, and then outputting the original pulse power after a delay, the laser relaxation oscillations disappears or occurs at a lower power of the light emission, with which the amplitude and probability of generation of the relaxation oscillations are reduced, thereby reducing the abnormal power at the moment of pulse operation and preventing the optical fiber from being overheated and damaged.

Device for controlling at least one light-emitting diode (LED1) to generate short light pulses (LP),- with an H-bridge (H) consisting of a first half-bridge (HB1: T1, T2) with a first transistor (T1) and a second transistor (T2) and a second half-bridge (HB2: T2, T3) with a third transistor (T3) and a fourth transistor (T4),- wherein the H-bridge (H) is controlled by a control unit (ST) and- wherein the H-bridge (H) can be operated by the control unit (ST) in pulsed mode (GPB) and in quasi-continuous mode (QDB) and- wherein the first half-bridge (HB1: T1, T2) is supplied with electrical energy from a first positive supply voltage (VCC1) and a first negative supply voltage (GND1) and- wherein the second half-bridge (HB2: T3,T4) is supplied with electrical energy from a second positive supply voltage (VCC2) and a second negative supply voltage (GND2) and- wherein the light-emitting diode (LED1) is connected with its cathode (K) to the output of the first half-bridge (HB1: T1, T2) and- wherein the light-emitting diode (LED1) is connected with its anode (A) to the output of the second half-bridge (HB2: T3, T4) and- wherein the first positive supply voltage (VCC1) and the second positive supply voltage (VCC2) can be equal and- wherein the first negative supply voltage (GND1) and the second negative supply voltage (GND2) can be equal and- wherein the light source, in particular the one or more light-emitting diodes (LED1), represents the load of the H-bridge (H) between the output of the first half-bridge (HB1: T1, T2) and the output of the second half-bridge (HB2: T3, T4) and- wherein the control device (ST) is designed to operate in pulsed mode (GPB) a “PAn” condition,in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a turn-on time (τpp), and- wherein the control device (ST) is designed so that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a clearing time (τpn), and- wherein the clearing time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1).

Pulsed laser drivers are disclosed comprising Gallium Nitride (GaN) power transistors for driving diode laser systems requiring high current and fast pulses, such as laser drivers for LIDAR (Light Detection and Ranging) systems. Drivers are capable of delivering pulses with peak current ≥100 A, e.g. 170 A to provide high peak power, fast pulses with nanosecond rise times and nanosecond pulse duration, for driving multi-channel laser diode arrays with 40 A per channel for 120 W output per channel for a combined peak output of 480 W. For lower duty cycle, example driver circuits are disclosed comprising a high current power transistor for direct drive with drive assist. For higher duty cycle, example resonant driver circuits are disclosed comprising two high current power transistors. Implementation of resonant driver circuits with GaN technology provides fast charging for short pulse operation at higher repetition rates or for pulse code modulation.

A radar sensor has an analog front-end with an in-phase, I, channel output and a quadrature-phase, Q, channel output. The radar sensor operates in a pulsed operation. A mode switch is used to couple a selected one of the I and Q-channel outputs to an analog processing circuit. The mode switch is operable in a first, I-channel, mode, a second, Q- channel, mode, and a third, time division multiplexing dual-channel, mode. In this way, the radar can operate in power efficient single-channel mode or a dual-channel mode for greater robustness to interference.

To provide various methods, controllers, and electric machine systems that facilitate pulsed operation of an electric machine to improve energy efficiency of the electric machine.SOLUTION: Selected transitions between the pulsed power levels are controlled to provide a third order or higher order transition torque profile. In various implementations, third order, fifth order, or higher order transition profiles are used. The use of such a transition torque profile may improve the NVH characteristics of the electric machine while providing energy efficient pulse transitions.SELECTED DRAWING: Figure 3

An electric machine controller arranged to direct a power converter to cause a pulsed operation of an electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges is provided. A ramp generator is adapted to provide a ramping between the pulsed operation and the continuous operation. In some embodiments, the ramp generator utilizes a quadratic, cubic or higher order ramping function. In some embodiments, during a first portion of the transitional period, the ramp generator causes pulsing between a first ramped transitional torque level and a second ramped transitional torque level that is lower than the first transitional torque level, and during a second portion of the transitional period, the ramp generator causes the electric machine to generate substantially zero torque in intervals between transitional pulses while ramping the first ramped transitional torque level.

A laser apparatus for generating a sub- 190 nanometer laser beam includes a deep-ultraviolet solid-state laser source to generate an initial deep-ultraviolet laser beam, at least one mid-infrared solid-state laser source to generate at least one respective mid-infrared laser beam, and at least one lithium triborate crystal to generate an output deep-ultraviolet laser beam from the initial deep-ultraviolet and mid-infrared laser beams via sum-frequency generation. Each mid-infrared solid- state laser source includes (a) a holmium-, thulium-, or chromium-doped gain crystal or gain fiber or (b) an optically-pumped semiconductor gain material to generate the respective mid-infrared laser beam. The laser apparatus may be configured for continuous-wave and pulsed operation, thus offering versatile solutions for applications requiring DUV laser radiation below 190 nanometers. Advantageously, the present approach relies on lithium triborate. Lithium triborate crystals can be grown with the quality and dimensions needed for industrial applications.

The invention relates to the technical field of equipment monitoring, and discloses a working state detection method and system for an electric leakage detection device, and a storage medium, a phase branch in a three-phase line is selected as a detected branch, a detection branch is used for short circuit or shunting, the connection point of the two branches is at one side of a zero sequence current transformer, and the detection branch does not pass through the transformer. And then controlling the detection branch to be short-circuited or shunt the detected branch for a first stable duration, if the electric leakage detection device does not have a preset electric leakage signal, sending a failure alarm prompt, and if so, outputting a normal prompt. Pulse operation is carried out in a control time period according to preset pulse frequency, pulse times and electric leakage signal triggering times are recorded, and the percentage of the ratio of the pulse times and the electric leakage signal triggering times is calculated, namely the triggering percentage. If the trigger percentage is smaller than the reference percentage, outputting a failure early warning prompt, if the trigger percentage is larger than the reference percentage, outputting a normal prompt, and adjusting the length of the control time period and the pulse frequency in a positive correlation manner according to the height. Whether the electric leakage detection circuit or device fails or not can be detected.

The present invention provides technology that achieves more accurate measurement while preventing luminance saturation.　The present technology provides a measurement device, etc., comprising a light source capable of switching between pulse operation and CW operation, and a control unit that controls the switching between pulse operation and CW operation, wherein the light source includes a saturable absorber that exhibits a quantum-confined Stark effect (QCSE). The control unit may control a voltage applied to the saturable absorber to switch between pulse operation and CW operation.

Headlight (SW), in particular for use in vehicles,- with at least one first LED (LED1) as a light source and- with an H-bridge (H) for controlling and supplying the first LED (LED1) with electrical energy,- wherein the headlight (SW) has a first operating mode (QDB) in which the first LED is used as a light source for illumination purposes and- wherein the headlight (SW) has a second operating mode (GPB) in which the first LED is used as a light source for generating light pulses (LP) in a function as a component of an optical data communication device and- wherein the H-bridge (H) is controlled by a control device (ST) and- wherein the H-bridge (H) can be operated by the control device (ST) in pulsed operation (GPB) in the second operating mode and in quasi-continuous operation (QDB) in the first operating mode and- wherein the control device (ST) is designed tothat in pulsed operation (GPB) a "PAn" state, in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained for longer than a turn-on time (τpp) by the H-bridge (H), and- wherein the control device (ST) is designed such that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained for longer than a turn-off time (τpn) by the H-bridge (H), and- wherein the turn-off time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1) is.,

Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies different D-axis and Q axis command signals. The different D-axis and Q-axis command signals permit adjustments to alter vehicle noise and vibration levels.

A system comprises pulse program compiler circuitry operable to analyze a pulse program that includes a pulse operation statement, and to generate, based on the pulse program, machine code that, if loaded into a pulse generation and measurement circuit, configures the pulse generation and measurement circuit to generate one or more pulses and / or process one or more received pulses. The pulse operation statement may specify a first pulse to be generated, and a target of the first pulse. The pulse operation statement may specify parameters to be used for processing of a return signal resulting from transmission of the first pulse. The pulse operation statement may specify an expression to be used for processing of the first pulse by the pulse generation and measurement circuit before the pulse generation and measurement circuit sends the first pulse to the target.

A method for controlling the operation of at least one first electric machine on board a vehicle, wherein the vehicle has at least one resonant frequency, is provided. Pulsed operation of the first electric machine is conducted such that it provides a desired average output, the pulsed operation causing the first electric machine to oscillate between a first output level greater than the desired output level and a second output level less than the desired output level. At least some transitions between the first and second output levels are controlled. At least one notch filter for the at least one resonant frequency of the vehicle is provided.

Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies different D-axis and Q axis command signals. The different D-axis and Q-axis command signals permit adjustments to alter vehicle noise and vibration levels.

Photobiomodulation therapy (PBMT) can be used to improve functional mobility of stroke survivors. A light source device can be contacted to a subject's skin proximal to an area of hemiplegia within a subject due to the stroke. A light signal (with wavelengths from the red to infrared part of the spectrum) can be applied in at least one of a pulsed operating mode, a continuous operating mode, and a super-pulsed operating mode through the light source device to the area of hemiplegia. The light signal is applied for a time sufficient to stimulate a phototherapeutic response in the area of hemiplegia to improve the functional mobility of the subject.

Described herein are methods for developing and maintaining pulses that are produced from compact resonant cavities using one or more Q-switches and maintaining the output parameters of these pulses created during repetitive pulsed operation. The deterministic control of the evolution of a Q-switched laser pulse is complicated due to dynamic laser cavity feedback effects and unpredictable environmental inputs. Laser pulse shape control in a compact laser cavity (e.g., length / speed of light<˜1 ns) is especially difficult because closed loop control becomes impossible due to causality. Because various issues cause laser output of these compact resonator cavities to drift over time, described herein are further methods for automatically maintaining those output parameters.

The present invention relates to the operation of a filament of an X-ray tube. In order to provide an X-ray tube with improved wear, a control device 10 for pulsed operation of a generator for an X-ray tube is provided. The X-ray tube is controlled to provide a plurality of X-ray pulses, two successive pulses separated in time by an emission pause. The emission pause comprises at least a first and a second part. A filament current is provided to a cathode filament of the X-ray tube such that in an emission pause between two successive pulses, a first filament current is provided during the first part of the pause and a second filament current is provided during the second part of the pause, the first filament current being lower than the second filament current. By operating the filament in this way, the filament temperature is reduced, which results in a significantly less wear and tear on the X-ray tube and an increased lifespan of the X-ray tube.

Methods of testing a multilevel inverter include selectively pulsing (i.e., attempting to turn on) at least one of the inner and outer switches of the inverter and determining a status of at least one of the inner switches, the outer switches and the neutral clamping diodes of the inverter based whether the pulsed at least one of the inner and outer switches desaturates. The pulsing may be preceded by charging the DC bus to a predetermined voltage magnitude that is less than a nominal working voltage magnitude of the DC bus, e.g., the predetermined voltage magnitude may be around 50% or less of the nominal working voltage magnitude.

The invention discloses an electrode assembly, an electron gun and electron gun equipment, and relates to the technical field of microwaves and millimeter waves, the electron gun comprises an anode used for accessing a first acceleration voltage signal, the electrode assembly is arranged in the anode, and the electrode assembly comprises a cathode, a first control electrode and a second control electrode; the cathode is provided with an emitting surface for emitting electron beams; the cathode is arranged in the first control electrode; the second control electrode is arranged in the first control electrode, the second edge of the second control electrode faces the first edge of the first control electrode, an electron penetrating gap allowing an electron beam to penetrate through is formed between the second edge of the second control electrode and the first edge, and the electron penetrating gap faces the emitting surface and is communicated with the anode; the first control electrode and the second control electrode are used for accessing a second acceleration voltage signal smaller than the first acceleration voltage signal; according to the invention, the problem that the electronic gun needs a complex and expensive high-power pulse modulation circuit in high-frequency, high-power and short-pulse operation and the problem of noise influence of high-voltage rapid switching can be solved.

Headlights (SW), in particular for use in vehicles, - with at least one first LED (LED1) as a light source, - wherein the headlight (SW) has a first operating mode (QDB) in which the first LED (LED1) is used as a light source for illumination purposes, and - wherein the headlight (SW) has a second operating mode (GPB) in which the first LED (LED1) is used as a light source for generating light pulses (LP) in a function as a component of an optical measuring device, - with an H-bridge (H) for controlling and supplying the first LED (LED1) with electrical energy, - wherein the H-bridge (H) is controlled by a control device (ST), and - wherein the H-bridge (H) can be operated by the control device (ST) in pulsed operation (GPB) in the second operating mode and in quasi-continuous operation (QDB) in the first operating mode, and - wherein the control device (ST) is designed tothat in pulsed operation (GPB) a "PAn" state, in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained for longer than a turn-on time (τpp) by the H-bridge (H), and- wherein the control device (ST) is designed such that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained for longer than a turn-off time (τpn) by the H-bridge (H), and- wherein the turn-off time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1) is.,

Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies distinct D-axis and Q-axis command signals. The distinct D-axis and Q-axis command signals enable adjustments to change the vehicle's noise and vibration levels.

This application discloses a method, apparatus, electronic device, and storage medium for evaluating the performance of quantum operation gates. The method includes: inserting a delay of a target duration between adjacent Clifford gates in a quantum benchmark test sequence to obtain a first benchmark test sequence; determining a first incoherent error based on the quantum benchmark test sequence and the first benchmark test sequence; the target duration is n times the duration of a pulse operation gate rotating 90° around a target axis; inserting n pulse operation gates rotating 90° around a target axis between adjacent Clifford gates in a purity random benchmark test sequence to obtain a second benchmark test sequence; determining a second incoherent error based on the purity random benchmark test sequence and the second benchmark test sequence; using the difference between the second incoherent error and the first incoherent error as the target incoherent error; and evaluating the performance of the quantum operation gate based on the target incoherent error, thereby realizing the performance evaluation of microwave generating devices and microwave transmission links.

The present application relates to the technical field of plasma control of nuclear fusion tokamak device, and particularly relates to a plasma control system configuration parameter distribution method.The technical scheme comprises deploying parameter analysis plug-ins of auxiliary components and algorithm components on real-time nodes, and the auxiliary components and the algorithm components interact through shared memory;in the discharge preparation stage, the auxiliary components obtain configuration parameters from a configuration parameter management component of a master node, parameter analysis plug-ins of each algorithm component perform parameter preloading, and the parameter analysis plug-ins perform real-time parameter analysis in the discharge control stage.The present application significantly reduces memory occupation and time consumption of configuration parameter distribution, meets the massive parameter management demand of long-pulse operation;through shared memory communication and preloading mechanism, the system high real-time is guaranteed, and time margin is left for algorithm operation;combined with dynamic parameter analysis and modular design, flexible expansion of algorithm components and dynamic switching of control strategies are supported, and redundant parameter occupation resources are avoided.

The present invention provides a high-voltage modulation circuit supporting continuous and high-repetition-rate pulse operation, relates to the technical field of microwave millimeter-wave phased array radar, and solves the defect problem that the prior art cannot simultaneously support continuous operation and high-repetition-rate pulse operation under high-voltage input; in the high-voltage modulation circuit, the input signal driving circuit is used to control the integrated gate driver through a first complementary driving signal; the gate voltage control power supply circuit is used to control the power supply of the input signal driving circuit according to the gate voltage of the final power amplifier chip; the integrated gate driver is used to control the conduction and shutdown of the modulation switch tube and the discharge tube respectively according to the first complementary driving signal; the dead zone adjustment circuit is used to adjust the switching speed of the modulation switch tube and the discharge tube; the isolation power supply circuit is used to power the integrated gate driver to maintain the conduction of the modulation switch tube under high-voltage input; the present invention has the advantages of high design adjustment freedom, safe circuit logic, adaptation to various working scenarios and multi-platform multi-purpose applications.

To improve the energy conversion efficiency of an electric machine.SOLUTION: A variety of methods, controllers, and electric machine systems are described that facilitate pulsed control of electric machines (e.g., electric motors and generators) to improve the machines' energy conversion efficiency. Under selected operating conditions, an electric machine is intermittently driven (pulsed). A pulsed operation causes the output of the electric machine to alternate between a first output level and a second output level that is lower than the first output level. The output levels are selected such that at least one of the electric machine and a system that includes the electric machine has a higher energy conversion efficiency during the pulsed operation than the electric machine would have when operated at a third output level that would be required to drive the electric machine in a continuous manner to deliver a desired output. In some embodiments, the second output level is zero torque.SELECTED DRAWING: Figure 3

Device for controlling at least one light-emitting diode (LED1) to generate short light pulses (LP), - with an H-bridge (H), • consisting of a first half-bridge (HB1) with a first transistor (T1) and a second transistor (T2) and • consists of a second half-bridge (HB2) with a third transistor (T3) and a fourth transistor (T4), and - with a control unit (ST) of the H-bridge and - wherein the control unit (ST) is designed to operate the H-bridge in pulsed and continuous operation and - wherein the light-emitting diode (LED1) has an anode (A) and a cathode (K) and - where the light-emitting diode (LED1) is inserted into the H-bridge (H) as a bridge load, • wherein the light-emitting diode is connected with its cathode (K) to the output of the first half-bridge (HB1: T1, T2) and • wherein the light-emitting diode (LED1) is connected with its anode (A) to the output of the second half-bridge (HB2: T3, T4) and - where the H-bridge (H) is made of • a first positive supply voltage (VCC1) and • a second positive supply voltage (VCC2) and • a first negative supply voltage (GND1) and • a second negative supply voltage (GND2) is supplied with electrical energy for transmission to the light-emitting diode (LED1) and • where the first transistor (T1) is connected to the first positive supply voltage (VCC1) and • where the third transistor (T3) is connected to the second positive supply voltage (VCC2) and • where the second transistor (T2) is connected to the first negative supply voltage (GND1) and • where the fourth transistor (T4) is connected to the second negative supply voltage (GND2) and • wherein the voltage that can be applied to the light-emitting diode (LED1) by the H-bridge in pulsed operation is higher in magnitude than the voltage that can be applied to the light-emitting diode (LED1) by the H-bridge in continuous operation in the same direction in the forward direction of the first LED (LED1) and / or in the reverse direction of the first LED (LED1) and • wherein the control device (ST) is designed to ensure that in pulse operation a “PAn” state, in which a forward voltage is applied to the first LED (LED1) in the forward direction, does not last longer than a switch-on time (τ) pp ) is taken, and • wherein the control device (ST) is designed so that in pulse operation a “PAuse” state, in which a blocking voltage is applied to the first LED (LED1) against the direction of flow, does not last longer than a clearing time (τ pn ) is taken, and • where the clearing time (τ pn ) smaller than the charge carrier lifetime (τ) in the PN junction of the first light-emitting diode (LED1) and • where the on-time (τ pp ) smaller than the charge carrier lifetime (τ) in the PN junction of the first light-emitting diode (LED1) and - wherein another transistor (T12) is connected to a third positive supply voltage (VCC3) at one terminal and to another terminal, the output of the second half-bridge (HB2: T3, T4) of the H-bridge (H) and - where the control connections (G1, G2, G3, G4, G12) are not connected to each other.