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

A power factor correction and dual active bridge technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, DC power input conversion to DC power output, etc., can solve the problem of transformer and switch tube peak and effective Large value current, large switching loss, conduction loss cannot be optimized, etc.

CN110943606BActive Publication Date: 2020-10-13BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-10-13

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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.
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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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Embodiment Construction

[0051] The present invention is described in detail below in conjunction with accompanying drawing and embodiment, also described the technical problem and beneficial effect that technical solution of the present invention solves simultaneously, it should be pointed out that described embodiment is only intended to facilitate the understanding of the present invention, and to It does not have any limiting effect.

[0052] This embodiment is based on a control method for power factor correction without current sampling of dual active bridge rectifiers. The dual active bridge rectifiers are isolated dual active bridge AC-DC rectifiers, based on figure 1 The circuit shown is implemented. The dual active bridge rectifier is composed of 12 switching tubes, wherein the power frequency PWM rectifier is composed of 4 switching tubes, and the full bridges on both sides of the dual active bridge converter transformer are respectively composed of 4 switching tubes. Node A and node B are...