3 results about "Pulse width modulation inverter" patented technology

A controller is provided for generating a carrier signal that controls a pulse width modulation (PWM) inverter that drives an electric actuator. The controller includes: an interface configured to connect to a sensitive device circuit via a sensor, where the sensitive device circuit includes a power system or an electric actuator, or a combination of a power system and an electric actuator, where the sensor is configured to measure an electromagnetic interference (EMI) spectrum; a memory configured to store a modulation band, measured electromagnetic interference (EMI) spectrum data for different frequency carriers, a desired EMI spectrum, and a learning-based carrier design program; a processor connected with the memory and configured to perform: generating a frequency modulated (FM) carrier signal by solving an optimization problem generated by a learned carrier design program with respect to a scan time for a predetermined frequency; and a PWM generator configured to generate a PWM signal based on the FM carrier signal.

The invention discloses a mixing pulse width modulation method based on an elliptic vector model and an inverter system, and mainly relates to the technical field of mixing pulse width modulation inverters. Comprising the steps that a switching frequency generation model based on an elliptic vector model is established, and the switching frequency generation model is used for adjusting the switching frequency in real time according to the phase of sinusoidal modulation waves and completing frequency mixing modulation with controllable switching harmonic distribution frequency bands; performing discretization processing on the elliptic vector model by setting a harmonic discretization ratio and a carrier wave ratio to generate a sampling point phase sequence and a sampling period sequence in a sine period; according to the sampling period sequence, a pulse width modulation pulse sequence is generated through a natural sampling method and used for controlling on-off of an inverter switching device. The method has the beneficial effects that the problem of concentrated distribution of harmonic waves of the high-frequency switch is solved, the output efficiency of the converter is improved, and the purpose of enabling the output of the inverter to be more accurate, higher in quality and more efficient is achieved.