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CLLLC resonance-based AC-AC bidirectional converter

A bidirectional converter, resonant converter technology, applied in the output power conversion device, AC power input conversion to AC power output, high-efficiency power electronic conversion and other directions, can solve problems such as unfavorable miniaturization and integration, loss, etc. The effect of good voltage regulation capability, improving overall efficiency, and simplifying the structure of the converter

Inactive Publication Date: 2016-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general bidirectional CLLLC resonant converter can only realize DC-DC conversion. In the application of AC power, a full bridge circuit needs to be connected to the input and output of the converter respectively to realize rectification and inversion, which is not conducive to Miniaturization and integration, and too many power conversion links will bring greater losses

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  • CLLLC resonance-based AC-AC bidirectional converter
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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto. It should be pointed out that if there is no specific control process (such as programming) in detail, those skilled in the art can refer to the prior art.

[0017] Such as figure 1 As shown, it is a kind of AC-AC bidirectional converter based on CLLLC resonance of the present invention, including power supply V in , load V o , four primary four-quadrant switches (S i1 -S i4 ), four secondary four-quadrant switches (S o1 -S o4 ), primary side resonant inductance L r1 , the secondary side resonant inductance L r2 , primary side resonant capacitor C r1 , the secondary side resonant capacitor C r2 and a magnetizing inductance L m Transformer T r ; Among them, four four-quadrant switches on the primary side (S i1 -S i4 ) to form a full bridge circuit and the prima...

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Abstract

The invention discloses a CLLLC resonance-based AC-AC bidirectional converter. A full-bridge structure is adopted by a primary side and a secondary side of a transformer, so that bidirectional flow of the power is ensured. The primary side and the secondary side of the transformer are connected to resonant capacitors and resonant inductors to form a symmetrical structure, so that soft switching and good voltage adjusting capacity are ensured within a full-load range; the switch of forming the full-bridge structure is a four-quadrant switch formed by reversely connecting two MOSFETs in series, so that the requirements of bearing a bidirectional voltage and conducting a bidirectional current are met; the voltage gain of the converter can be changed by adjusting the switching frequency of the MOSFET at an input end; and the converter can work in a buck mode and a boost mode respectively. By a DC-DC bidirectional CLLLC resonant converter, the front end and the rear end of the converter are connected with a rectifier circuit and an inverter circuit to achieve AC-AC conversion respectively, so that miniaturization and integration are not facilitated. Compared with the prior art, the AC-AC bidirectional CLLLC resonant converter has the advantages that the power conversion links and passive elements are relatively few; and the overall efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the field of AC-AC bidirectional converters, in particular to an AC-AC bidirectional converter based on CLLLC resonance. Background technique [0002] The circuit structure of the LLC resonant converter is simple, the work efficiency is high, and it still has good voltage regulation characteristics in the case of a wide range of input voltage and load variation. It can not only realize the ZVS of the switching tube on the primary side, but also realize the ZCS, and the voltage stress of the primary and secondary side tubes is low, which has high research value. On the basis of fully inheriting the advantages of LLC resonant converter, the bidirectional CLLLC resonant converter realizes the bidirectional flow of power, and has been widely used in the fields of electric vehicles, renewable energy, DC power distribution systems, uninterruptible power supply systems, and power electronic transformers. Applications. However, the g...

Claims

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Application Information

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IPC IPC(8): H02M5/293
CPCH02M5/293Y02B70/10
Inventor 杜贵平温先佳
Owner SOUTH CHINA UNIV OF TECH