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Mixed bridge-type isolated bidirectional DC converter and control method therefor

A bidirectional DC conversion and isolation technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc. The effect of reducing heat dissipation pressure

Active Publication Date: 2016-02-17
STATE GRID CORP OF CHINA +3
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  • Claims
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Problems solved by technology

Under this control method, eight switching losses will be generated in one switching cycle. The switching loss of IGBT is basically on the order of tens of mJ / time. The direct multiplication of this value and the switching frequency is the switching loss. Therefore, with the system frequency increase, the loss will be very considerable, which is not conducive to the further improvement of system efficiency

Method used

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  • Mixed bridge-type isolated bidirectional DC converter and control method therefor
  • Mixed bridge-type isolated bidirectional DC converter and control method therefor
  • Mixed bridge-type isolated bidirectional DC converter and control method therefor

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0021] refer to figure 1 , is the topology of a hybrid bridge-arm isolated bidirectional DC converter in an embodiment of the present invention, including a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm, a high-frequency isolation transformer T, and an input capacitor C 1 , output capacitance C 2 , wherein: the first bridge arm is composed of two switch tubes S1, S2, the second bridge arm is composed of two switch tubes S3, S4, the third bridge arm is composed of ...

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Abstract

The invention provides a mixed bridge-type isolated bidirectional DC converter and a control method therefor. The converter comprises a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm, a high-frequency isolation transformer T, a capacitor C1, and a capacitor C2. The first bridge arm consists of two switching tubes S1 and S2, and the second bridge arm consists of two switching tubes S3 and S4. The third bridge arm consists of two switching tubes S5 and S6, and the fourth bridge arm consists of two switching tubes S7 and S8. The switching tubes S2, S4, S7 and S8 are SiC-MOSFET switching tubes. According to the invention, the converter enables the novel SiC-MOSFETs with smaller switching loss to be combined with a current mainstream semiconductor technology, enables the switching loss to be centralized on the SiC-MOSFETs through control, enables an isolated bidirectional DC converter to have the advantages of two types of switching devices, and improves the system efficiency and switching frequency.

Description

technical field [0001] The present invention relates to the technical field of electrical automation equipment, in particular to a hybrid bridge-arm type isolated bidirectional DC converter with integrated IGBT and SIC-MOSFET applied to a DC microgrid and a control method thereof. Background technique [0002] The isolated bidirectional DC converter is one of the key components in the DC microgrid. Its status is similar to that of the transformer in the AC grid. It can realize the bidirectional transmission of DC energy, voltage level conversion and fault isolation. One of the more mature isolated bidirectional DC converters uses a dual phase-shift bridge topology, which has a simple structure and control. Under medium and high frequency operation, the volume of the isolation transformer can be greatly reduced and the efficiency is higher. [0003] The traditional dual phase-shift bridge topology uses Si-IGBT as the switching device, and the control method adopts phase-shift...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 蔡旭高宁魏晓光
Owner STATE GRID CORP OF CHINA
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