A Distributed Pulse Width Modulation Method Based on Multi-Core Cooperation

Abstract

The invention relates to a distributed pulse width modulation method based on multi-core cooperative work. The hardware architecture adopts the master-slave control mode, which consists of a main module and several sub-modules. The main module and the sub-modules are connected by 485 communication. Each sub-module contains an H-bridge unit, and each H-bridge unit is cascaded. After being output by the LC filter circuit, the method is specifically implemented as follows: the main module parameter initialization; the main module updates the status of the sub-modules and calculates the total error value of the current output voltage; The output sub-module calculates the delay time and outputs a new level; the sub-module is fault-protected. The present invention effectively improves the control ability and computing ability of the whole equipment. The main module controls the sub-modules through communication and interaction. The stability is higher than the traditional modulation method.

Description

technical field [0001] The invention belongs to the field of converter control, and in particular relates to a distributed pulse width modulation method based on multi-core cooperative work. Background technique [0002] The topology of the cascaded H-bridge converter can be equivalent to being composed of multiple full-bridge inverter circuits in series. This structure has a series of advantages such as large output power capacity, low switching frequency, small output harmonics, and good electromagnetic compatibility. advantages, has received more and more attention. The modulation method of the traditional cascaded H-bridge converter is that the main control chip uniformly controls all the bridge arms of the H-bridge, which requires a single control chip to have sufficient IO pins and corresponding computing capabilities, especially when the number of cascaded For a long time, the selection of the main control chip is relatively difficult, which is not conducive to pract...

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Problems solved by technology

Document 1.1 proposes a distributed commutation pulse width modulation method (DCPWM), however, this modulation method has defects in dealing with the fact that a single H-bridge unit cannot satisfy the volt-second balance within a sampling period, and this document only provides distributed modulation The idea does not introduce the specific architecture of the hardware implementation of the method

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