Control method of power factor correction based on dual active bridge rectifier without current sampling

Abstract

The control method based on the non-current sampling power factor correction of dual active bridge rectifiers disclosed by the invention belongs to the field of AC-DC rectifiers for energy storage in the field of power electronics. The dual active bridge (DAB) converter of the present invention is isolated through a transformer, the primary side and the secondary side of the transformer are respectively two full bridges, and the output is used to connect any load. Through the switching of the working mode of the DAB converter, the duty cycle of the two full bridges and the corresponding phase shift angle of the inverter voltage waveform are controlled to realize the power factor correction of the rectifier. In order to use the DAB converter in the field of AC-DC rectifiers and realize power factor correction without current sampling, the present invention comprehensively optimizes the stable control and high efficiency of the dual active bridge rectifier on the basis of realizing power factor correction and output voltage control , optimize the modal control of the conduction loss and zero-voltage soft switching, realize the switching of the working mode according to the needs, and ensure the soft switching of the 8 switching tubes of the DAB converter and the optimization of the peak current of the transformer.

Description

technical field [0001] The invention relates to a control method for power factor correction based on dual active bridge rectifiers without current sampling, and belongs to the field of AC-DC rectifiers for energy storage in the field of power electronics. Background technique [0002] Traditional isolated AC-DC rectifiers generally adopt a two-stage structure, and non-isolated power factor correction PFC is used to connect isolated DC-DC. The AC-DC output is a constant DC voltage, and the output voltage is regulated by an isolated DC-DC. In 2016, the article "Optimal ZVSModulation of Single-Phase Single-Stage Bidirectional DAB AC–DC Converters" was published in IEEE Transactions on Power Electronics [Journal of Power Electronics]. The isolated AC-DC converter is implemented by means of power frequency full-bridge rectification, which saves the filter inductor and filter capacitor required for power factor correction. The output voltage is controlled through a dual active ...

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Problems solved by technology

However, the method used in this paper cannot realize the zero-voltage turn-on soft switching of all switching tubes, so the switching loss is relatively large

It is not suitable for high-frequency applications. At the same time, the current in the transformer works in a discontinuous mode. The peak value and RMS current of the transformer and switch tube are large, so the conduction loss cannot be optimized.

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