Triple phase shift control method and control device of dual active bridge circuit

Abstract

The invention provides a triple phase shift control method and control device for a dual-active bridge circuit, and the dual-active bridge circuit comprises three-level plus three-level, three-level plus two-level, and two-level plus three-level. The method comprises the following steps: selecting a circuit structure according to the voltage ranges of an input voltage source and an output voltage source of the dual-active bridge circuit and the withstand voltage range of a switching tube; judging phase shift modes, including a step-down triple phase shift mode and a step-up triple phase shift mode; according to the equivalent voltage of the input voltage source, the equivalent voltage of the output voltage source and the closed-loop control quantity of the dual-active bridge circuit, calculating corresponding triple phase shift angles in different phase shift modes; and performing phase shift control according to the triple phase shift angle. According to the method, a proper dual-active bridge circuit topology is selected according to different voltage levels, the voltage withstand level of a switching tube is reduced, the combination mode is flexible, the cost is saved, triple phase shift control is adopted for the selected topology, the switching-on loss of the switching tube can be reduced, and the working efficiency of the dual-active full-bridge circuit is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a triple phase-shift control method for a dual active bridge circuit and a triple phase-shift control device for a dual active bridge circuit. Background technique [0002] In recent years, energy bidirectional flow converters have received a lot of attention and are widely used in uninterruptible power supplies, battery charging and discharging systems, motor drives, and hybrid electric vehicles. Among them, the DAB (Dual Active Bridge, dual active bridge) circuit is considered to be one of the best topologies for realizing bidirectional flow of energy, and is often used in high power density and high power applications. [0003] At present, the traditional DAB circuit has a two-level structure, which requires a high withstand voltage of the switching device, and when the voltage difference between the two ends of the DAB is large, the ZVS (Zero Voltage Switch) of the ...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional DAB circuit has a two-level structure, which requires a high withstand voltage of the switching device, and when the voltage difference between the two ends of the DAB is large, the ZVS (Zero Voltage Switch) of the switching device is not effective.

And the control algorithm of the DAB circuit mostly adopts single phase-shift control. The disadvantage of this method is that when the input and output voltage change range is large, the realization effect of ZVS is relatively poor at this time.

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