Switch tube control method and device and inverter

Abstract

An embodiment of the invention discloses a switch tube control method and device and an inverter that can help solve a problem that voltage stress of a switch tube in the inverter exceeds a permit value in adverse working conditions based on conventional technologies; work reliability of the inverter can be improved, switch-on and switch-off speed of the switch tube can be improved, loss can be reduced, and system efficiency can be increased. The switch tube control method comprises the following steps: a bus voltage value across two ends of a bus connected among a plurality of switch tube bridge arms and a current value of a current flowing through an inductor in a filter circuit are obtained; a current limit value corresponding to the bus voltage value is determined according to a presetcorrespondence relation between a plurality of voltage threshold value sections and current limit values and a voltage threshold value section in which the bus voltage value is positioned; switch tubes in the plurality of switch tube bridge arms are controlled to be switched on or off according to a relation between the current value of the current flowing through the inductor and the current limit value.

Description

technical field [0001] The present invention relates to the technical field of communication power supplies, in particular to a switch tube control method and device used in an inverter circuit and an inverter using the switch tube control device. Background technique [0002] The inverter is a device that converts direct current into alternating current (DC / AC). The conversion circuit of the inverter is usually composed of a bus capacitor, an inverter bridge, an output filter circuit, a controller, etc. The inverter bridge is usually composed of multiple Each switching tube bridge arm is composed of two or more switching tubes, which is the core device of the inverter. [0003] In order to ensure the reliability of the inverter, it is necessary to ensure that the switch tube of the inverter is not damaged under various working conditions. Therefore, in order to avoid excessive current flowing through the switch tube and damage the switch tube, it is necessary to ensure The...

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a switching tube control method, device, and inverter, which are used to solve the problem in the prior art that the voltage stress of the switching tube in the inverter exceeds the allowable value under severe working conditions, and improve the inverter's performance. Work reliability, can improve the switching tube turn-on and turn-off speed, reduce loss, improve system efficiency

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