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Series-parallel type double-active bridge circuit

A dual active bridge and circuit technology, applied in circuit devices, battery circuit devices, collectors, etc., can solve the problem that the dual active bridge circuit cannot be applied to occasions where the voltage ratio is large, so as to reduce heat generation and conduction loss , The effect of reducing the requirements of the withstand voltage level

Inactive Publication Date: 2014-06-11
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the dual active bridge circuit in the prior art cannot be applied to occasions where the voltage ratio is relatively large, and to provide a series-parallel dual active bridge circuit, which can reduce circuit energy consumption and improve conversion efficiency

Method used

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  • Series-parallel type double-active bridge circuit
  • Series-parallel type double-active bridge circuit
  • Series-parallel type double-active bridge circuit

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Embodiment Construction

[0025] Such as figure 1 A serial-parallel dual active bridge circuit shown, including the first dual active bridge circuit and the second dual active bridge circuit, the input side of the first dual active bridge circuit and the second dual active bridge circuit After being connected in series with the high voltage input network side, the second dual active bridge circuit and the output side of the second dual active bridge circuit are connected in parallel with the low voltage output network side, the first dual active bridge circuit and the second dual active bridge circuit The switch tubes at the corresponding positions in the circuit are switched on and off synchronously, and the diagonal switch tubes on the high-voltage side and low-voltage side of each dual active bridge circuit are switched on and off synchronously, and the high-voltage input network side is the power grid and the AC / DC circuit , the low-voltage output grid side is the battery.

[0026] When the presen...

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Abstract

The invention discloses a series-parallel type double-active bridge circuit, belonging to the fields of power electronics and electrotechnology. The bridge circuit comprises a first double-active bridge circuit and a second double-active bridge circuit, wherein input sides of the first double-active bridge circuit and the second double-active bridge circuit are connected in series and are subsequently connected with a high-voltage input grid side; output sides of the first double-active bridge circuit and the second double-active bridge circuit are connected in parallel and are subsequently connected with a low-voltage output grid side. By means of a mode that the input sides are connected in series and the output sides are connected in parallel, the requirements on voltage resistance grade of a switch tube of a high-voltage side are alleviated, the heating of the switch tube is reduced, and therefore the conductive consumption of the overall circuit is reduced. Therefore, the bridge circuit is high in energy conversion efficiency in the situation of large voltage change, and the bridge circuit can be used as a direct current-direct current conversion circuit of a bidirectional charger for charging and discharging power of a low-voltage battery pack.

Description

technical field [0001] The invention relates to a DC-DC conversion circuit, in particular to a dual active bridge circuit, which belongs to the technical field of power electronics and electric engineering. Background technique [0002] There are mainly two types of DC-DC converters used in existing bidirectional charger circuits: 1) DC-DC bidirectional converters that are not electrically isolated, and 2) isolated DC-DC bidirectional converters. In the first method, most of the bidirectional half-bridge circuits are used. When the voltage of the battery pack is low in this circuit, the voltage becomes relatively large compared with the DC high voltage on the input side, which limits the voltage adjustment range and reduces the voltage. In addition, the electrical isolation between the battery and the DC bus has potential safety hazards. The second method mostly uses dual active bridge circuits. Because of the use of high-frequency isolation transformers, it solves the prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J7/10
Inventor 方宇
Owner YANGZHOU UNIV
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