Control method, controller and converter of resonant dual active bridge converter circuit

Abstract

The present application discloses a control method for a resonant dual active bridge conversion circuit, which includes the following steps: sampling the voltage on the DC side of the primary circuit, the voltage on the DC side of the secondary circuit, and the secondary current; using the input voltage and The output voltage is used to calculate the voltage gain; the voltage gain is used to calculate the phase shift angle in the bridge of the primary circuit at the resonant frequency, and the phase angle difference between the phase shift angle between the bridges at the switching frequency and the phase shift angle in the bridge at the resonant frequency; Calculate the switching frequency of the resonant dual active bridge conversion circuit according to the secondary side current; generate control signals according to the switching frequency, the phase shift angle and the phase angle difference in the bridge at the resonant frequency, and control the switching tubes in the primary side circuit and the secondary side circuit on and off. This application only uses the voltage gain to calculate the two phase shift angles, and then adjusts the output current of the circuit through frequency control, so that the control of the circuit becomes simple and the amount of calculation is small. The application also provides a controller and a converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a control method, a controller and a converter of a resonant double active bridge conversion circuit. Background technique [0002] In recent years, due to the rise of electric vehicle charging, photovoltaic energy storage and other industries, DC / DC converters have attracted more and more attention. Especially the dual active bridge DC / DC converter, which can realize the electrical isolation of the primary and secondary sides through the transformer, is a research hotspot in the DC / DC converter. [0003] However, the current DAB (Dual Active Bridge, dual active bridge) conversion circuit has some defects, such as the small voltage gain range of the circuit, and the soft switching failure of the switching device under certain working conditions. [0004] In order to solve the above problems, an existing improvement scheme is to add an LC resonant circuit to...

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Problems solved by technology

[0005] The purpose of this application is to provide a control method, device and converter for a resonant dual active bridge conversion circuit, which solves the problem of large calculations and control problems in the prior art using frequency conversion and phase shifting methods to adjust the resonant dual active bridge conversion circuit. complicated question

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