7 results about "Carrier current" patented technology

The invention discloses a time interference double-target electrical stimulation system, which comprises a signal generation unit used for generating multiple paths of carrier signals and adjusting the frequency, amplitude and / or phase of the carrier signals; the current output unit is used for converting the multiple paths of carrier signals into multiple paths of carrier currents, and electrical isolation and intermodulation suppression are provided between the multiple paths of carrier currents; the electrode unit is electrically connected with the current output unit and comprises a plurality of electrodes and a position subunit, the plurality of electrodes are used for receiving the multi-channel carrier current so as to discharge in an attached target area, and the position subunit is used for determining the attaching position of each electrode; and the control unit is used for controlling the discharge of the plurality of electrodes, detecting the impedance and carrier current at the plurality of electrodes to assist the position subunit in determining the fitting position and detecting the frequency and / or phase of the plurality of carrier current to control the signal generation unit to adjust the frequency and / or phase of each path of carrier signal. The system realizes independent stimulation of two target spots in a hardware-level time interference mode, has signal output with high stability and low mutual interference, and can perform real-time feedback regulation and safety protection.

The invention relates to the technical field of terahertz wave generation and transmission, in particular to a rectangular waveguide output type photoconductive mixer based on effective dielectric silicon waveguide coupling. The photoconductive mixer comprises a photoconductive substrate used for exciting carriers through a photoconductive effect; the metal planar antenna is arranged on the first surface of the photoconductive substrate and is used for converting carrier current into a terahertz radiation signal; the effective medium silicon waveguides are arranged on the second surface and the two side faces of the photoconductive substrate in a coupling mode, and the second surface is opposite to the first surface; the rectangular waveguide is used for receiving and outputting a terahertz signal; the effective medium silicon waveguide comprises a waveguide core and air hole arrays distributed on the two sides of the waveguide core, and the air hole arrays are configured to enable the effective medium silicon waveguide to form a refractive index gradient so as to constrain transmission of signals in the waveguide core. By adopting the method, rectangular waveguide output can be efficiently realized, and the method has the characteristic of high structural integration degree.

The application belongs to the technical field of power devices, and provides a softness modulation type IGBT device and a preparation method and a chip thereof. A softness modulation zone including an N-type diffusion layer and a local carrier lifetime control layer is formed between an N-type field termination layer and an N-type drift layer, the doping concentration of the N-type diffusion layer is less than the doping concentration of the N-type field termination layer, then a front IGBT structure and a front protective layer are formed on the N-type drift layer, so that when the IGBT device is at a lower working voltage, carrier current can be maintained at the end of device turn-off, and turn-off softness is maintained, turn-off time and turn-off loss are reduced, when the IGBT device is at a higher working voltage, the depletion layer of the device can be cut off in the N-type diffusion layer, so that the turn-off current of the IGBT device will not oscillate, and the problems of long current tail, large loss and high risk of overvoltage failure of the current IGBT device under voltage fluctuation are solved.

This invention discloses a time-interference-based closed-loop neuromodulation system and method. The system includes: a physiological signal acquisition module for synchronously acquiring multimodal physiological signals from the user; a processing and decision module for fusing the multimodal physiological signals, real-time discrimination of respiratory events and target tissue recruitment status, and generation of modulation commands based on the discrimination results; and a programmable stimulation module for generating at least two high-frequency carrier currents with different frequencies according to the modulation commands, and applying them to the user's mandibular region through surface electrodes to stimulate the target tissue. The processing and decision module is also used to dynamically adjust the modulation commands based on the response of the multimodal physiological signals to the stimulation, thereby controlling the programmable stimulation module to perform at least one of intensity modulation, focus modulation, and target modulation. This invention can sense airway status and muscle response in real time and dynamically optimize the intensity and spatial focus of time-interference stimulation, achieving efficient and comfortable OSA treatment.

The invention provides a direct-current electric energy meter based on a TMR current sensor and a direct-current electric energy metering method. The direct-current electric energy meter and the direct-current electric energy metering method aim at solving the problems that in the prior art, a direct-current electric energy meter is insufficient in metering precision. The direct current electric energy meter comprises a current sensing module which comprises a carrier current guide and is used for conducting detected direct current; the TMR current sensor is arranged near the current-carrying conductor and is used for detecting a magnetic field generated by the current-carrying conductor due to the fact that the detected direct current passes through the current-carrying conductor and outputting a corresponding analog voltage signal; the signal processing circuit is connected with the current sensing module and is used for receiving the analog voltage signal, processing the analog voltage signal and converting the analog voltage signal into a digital signal; the metering module is connected with the signal processing circuit and used for receiving the digital signal and calculating electric energy consumption based on the digital signal; the display module is connected with the metering module and is used for displaying the electric energy consumption metering result; and the power supply module provides working voltage for the current sensing module, the signal processing circuit and the metering module.

The invention discloses a transcranial time interference stimulation parameter optimization system and method, and belongs to the technical field of nerve regulation and control. The system comprises a tTIS stimulator, an electrode array, a control module and a calculation module. According to the system, two paths of high-frequency carrier current with a specific frequency difference generated by the tTIS stimulator interfere in a target brain region to generate a low-frequency envelope electric field, so that accurate non-invasive regulation and control on a deep brain region are realized. The system constructs a personalized head model based on head image data of a subject, and optimizes an electrode application position; the control module executes a preset stimulation protocol, preferentially fixes the stimulation duration and the envelope frequency, allows the current intensity to be adjusted within a safe range, and is provided with an automatic stop mechanism to prevent excessive treatment. The invention is particularly suitable for treating human chronic pain through targeted regulation of the ventral prefrontal cortex (vmPFC), the regulation principle is verified in a mouse model, and the drug has the characteristics of accurate stimulation, high safety, lasting curative effect and the like.