Phase shift sequence control method of bidirectional half-bridge three-level DC-DC converter

Abstract

The invention provides a phase shift sequence control method for a bidirectional half-bridge three-level DC-DC converter, and the method comprises the steps: building a voltage sampling circuit, arranging the voltage sampling circuit at the output end of a bidirectional half-bridge three-level DC-DC converter, and judging the working condition of the converter through an output voltage comparison unit; generating a phase shift sequence selection signal conforming to the current working condition of the converter by using a selection signal generation unit; using the phase shift sequence generation unit for generating phase shift sequence signals with the same frequency, the same duty ratio and different phase shift angles; and using the phase shift sequence selection unit for selecting the combination of different phase shift sequence signals to control the on and off of each switch tube of the bidirectional half-bridge three-level DC-DC converter. According to the invention, a load current loop and a PI compensation circuit are not used, the design difficulty of a converter controller is not increased, a fast dynamic response speed and high anti-interference performance can be realized, and the method is suitable for an application scene with frequent load change.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a phase shift sequence control method of a bidirectional half-bridge three-level DC-DC converter. Background technique [0002] Transportation is a basic, leading, strategic industry and an important service industry in the national economy, and it is an important support for promoting sustainable development. As a typical representative of modern transportation, high-speed trains, on-board power electronic transformers to replace on-board traditional traction transformers and four-quadrant rectifiers are the development direction. As the core component of the on-board power electronic transformer, the bidirectional half-bridge three-level DC-DC converter has the characteristics of high power density, high transmission efficiency and high reliability. In order to make the performance of the bidirectional half-bridge three-level DC-DC converter better and more...

AI Technical Summary

Problems solved by technology

However, this method of adding a phase shift angle will make the control design more complex, increase the number of compensation circuits, and is difficult to apply to the occasions where the converter load changes frequently and requires a faster dynamic response

Images