DC-DC converter additionally provided with buffer and method for reducing backflow power

A DC-DC and converter technology, applied in the field of dual active bridge circuit DC-DC converters, can solve problems such as poor use effect, large voltage changes, and reduced return power of dual active bridge DC-DC converters.

Pending Publication Date: 2018-04-13
SICHUAN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a DC-DC converter capable of suppressing voltage spikes and reducing electromagnetic interference (EMI) in view of the current situation that the existing dual active bridge DC-DC converter has a relatively large voltage ch

Method used

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  • DC-DC converter additionally provided with buffer and method for reducing backflow power
  • DC-DC converter additionally provided with buffer and method for reducing backflow power
  • DC-DC converter additionally provided with buffer and method for reducing backflow power

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Embodiment Construction

[0078] See attached figure 1 , 2 .

[0079] The DC-DC converter includes a high-frequency isolation transformer, DC active full bridges and inductors on the left and right sides.

[0080] In order to improve the performance of the converter, the present invention deploys a buffer circuit on the power switch. The main function of the buffer circuit is to suppress overvoltage, reduce the loss of the power switch tube, suppress voltage spikes and effectively reduce EMI electromagnetic interference. DC-DC converter with buffer, active full bridge high frequency isolation transformer The active full bridge on both sides is composed of four IGBT power switch tubes, four diodes and four snubber capacitors, and the diodes are connected in reverse series to the IGBT power On the switch tube, the snubber capacitor is connected in parallel to the IGBT power switch tube. Four IGBT power switch tubes S on the left active full bridge 1 ~S 4 Anti-series four diodes Q 1 ~ Q 4 , in para...

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PUM

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Abstract

The invention discloses a DC-DC converter additionally provided with a buffer and a method for reducing the backflow power. Buffer capacitors are respectively connected to IGBT power switching tubes of the DC-DC converter in parallel so as to form a buffer. The flowing direction of power is controlled according to the demand for power of the left side and the right side of the dual-active-bride DC-DC converter, the output power and the backflow power are defined, soft switching conditions under different voltage transformation ratios K are analyzed and compared by adopting a double phase shiftcontrol method, and a transmission power limit and an optimal backflow power control program are calculated and optimized. The backflow power at the right side is used for charging an inductor and the backflow power at the right side is taken as a control target in the control. According to the method, the DC-DC converter deploys a buffer on a power switch, thereby effectively improving the performance of the converter, suppressing the overvoltage peak, reducing EMI (electromagnetic interference), and reducing the loss of the power switching tubes. Compared with the adoption of a single phaseshift method, the adoption of the double phase shift control method has the advantages that the backflow power of the converter is significantly reduced and stabilized, the application prospect is very wide, and popularization is carried out easily.

Description

technical field [0001] The invention relates to a DC-DC conversion electrical appliance, in particular to a dual active bridge circuit DC-DC converter equipped with a buffer, which belongs to the category of power electronics and electric engineering. Background technique [0002] Dual active bridge (dual-active-bridge, DAB) DC-DC converter, that is, DC-DC converter, is functionally equivalent to two unidirectional DC-DC conversions, increasing the bidirectional flow capacity of energy, and Compared with the traditional unidirectional DC-DC converter, the number of components is saved, the volume of the system is reduced, the cost is reduced, and the efficiency of the system is improved at the same time. Therefore, the dual active bridge DC-DC converter has been more and more widely used in green energy such as DC motor drive, uninterruptible power supply, electric vehicle and wind power generation. The existing dual active bridge DC-DC converter, that is, the main circuit ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/34H02M1/44
CPCH02M1/34H02M1/44H02M3/3353H02M1/346Y02B70/10
Inventor 苗虹高选杰曾成碧周宇鑫刘广程平凡熊正勇卢杨
Owner SICHUAN UNIV
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