3results about How to "Reduce instantaneous current" patented technology

This application relates to the field of motor control technology and discloses a motor control method and system. The motor control method includes: upon detecting an AC zero-crossing, determining the electrical angle increment of the motor relative to the previous AC zero-crossing; determining the electrical angle of the current AC zero-crossing based on the electrical angle of the previous AC zero-crossing and the electrical angle increment; determining the target phase path that needs to be turned on based on the comparison results of the electrical angle of the current AC zero-crossing with multiple conduction control intervals; and controlling the target phase path to be turned on at the current AC zero-crossing. This motor control method, through precise electrical angle tracking and zero-crossing synchronized phase-by-phase conduction control, can reduce the instantaneous current during motor startup, effectively limit current surges, alleviate transient stress on channel devices, lines, and the load body, and achieve soft starting of the motor.

The invention discloses a forming method of a thin film stacking structure and the thin film stacking structure. The method comprises the following steps: forming a first material layer; a second material layer is formed on the first material layer, and the forming method of the second material layer comprises the steps that an initial seed layer is formed on the first material layer through first deposition treatment, the first deposition treatment has a first bias voltage, the first bias voltage is smaller than or equal to a preset voltage, and the initial seed layer is formed on the first material layer; the preset voltage is a deposition process bias voltage with minimum damage to the first material layer; a strengthened seed layer is formed on the initial seed layer through second deposition treatment, the second deposition treatment has second bias voltage, and the second bias voltage is larger than the first bias voltage; and forming a main body layer on the reinforced seed layer. According to the invention, the thickness reduction effect is eliminated, the overall resistance of the phase change memory cell is improved, and the instantaneous current and read interference are reduced.

The invention provides a power management system and a power management method for a handheld terminal, and belongs to the technical field of power management. The system comprises a battery management terminal, a power management module and a battery pack, wherein the power management module is electrically connected with the battery management terminal, the battery pack and a controller. The power management module obtains battery state parameters from the battery pack and reports the battery state parameters, and the battery management terminal generates and issues a battery parameter configuration file and a current limit configuration file. The power management module updates battery pack configuration parameters according to the battery parameter configuration file, compensates the current charge state, and displays the compensated charge state on the terminal; and according to the current limiting configuration file, the working parameters of the power utilization module of the handheld terminal are limited through the controller. According to the method, the electric quantity estimation and current limiting strategy can be dynamically optimized according to the battery state, the accuracy and smoothness of electric quantity display are improved, and the abnormal shutdown risk of the handheld terminal under the low-temperature, high-load and aging working conditions is reduced.