Bidirectional full-bridge converter-based wide-output voltage range control method for soft switching

Abstract

The invention discloses a bidirectional full-bridge converter-based wide-output voltage range control method for soft switching. The method comprises the following steps: setting working frequencies of all switch tubes of a bidirectional full-bridge converter to be the same, and setting dead time of upper and lower switch tubes of a same bridge arm; determining a power phase-shift angle and a modulating phase-shift angle to be adjustable variables; obtaining conditions of a primary bridge of the bidirectional full-bridge converter for achieving soft switching according to the power phase-shift angle and current constraint conditions of an half cycle, and determining the range of the power phase-shift angle; and determining the relationship between the power phase-shift angle and the modulating phase-shift angle under the maximum power condition and changing a synchronous timing sequence according to the obtained calculation result. The advantages of achieving soft switching within a full-power range and easily achieving wide-range adjustment of the output voltage by the full-bridge converter can be achieved; and zero-voltage switching of all power tubes on a primary side and a secondary side is achieved within the wide-voltage output range from an idle load to a full load.

Description

technical field [0001] The invention relates to the field of DC converters, in particular to a soft-switching wide output voltage range control method based on a bidirectional full-bridge converter. Background technique [0002] As the energy buffer link of the smart grid energy storage system, the energy storage system has been widely used. For example, energy storage units such as batteries, flywheels, and supercapacitors can not only realize the bidirectional flow of electric energy, but also improve the quality of electric energy through the bidirectional DC converter as an intermediate link. Therefore, improving the efficiency of bidirectional DC converters is at the heart of the energy storage task. Considering the discharge depth of the energy storage battery, the converter will work in a wide power range. In order to improve the efficiency of the converter, it is necessary to realize soft switching within the required power range, while the traditional bidirectional...

AI Technical Summary

Problems solved by technology

Considering the discharge depth of the energy storage battery, the converter will work in a wide power range. In order to improve the efficiency of the converter, it is necessary to realize soft switching within the required power range, while the traditional bidirectional converter can only operate in a certain range. Realizing soft switching within a power range cannot meet the wide power working range of the energy storage battery, thereby reducing the efficiency of the system

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