3 results about "Carrier current" patented technology

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.