Isolated Boost double-half-bridge DC-DC (Direct Current-Direct Current) converter

A DC-DC, double-half-bridge technology, applied in the direction of converting DC power input to DC power output, instrumentation, and adjusting electrical variables, can solve problems that are not conducive to the development of high-efficiency and high-power-density development goals of DC microgrids, and do not meet the requirements of high system requirements. Power density requirements, increased system volume and other issues, to achieve the effect of easy parallel operation, simple structure, and improved conversion efficiency

Inactive Publication Date: 2018-01-19
TIANJIN UNIV
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Problems solved by technology

Two-stage DC-DC conversion not only increases the volume of the system, does not meet the high power density requirements of the system, but also affects the overall conversion efficiency, which is not conducive to the high-efficiency and high-power-density development goals of DC microgrids

Method used

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  • Isolated Boost double-half-bridge DC-DC (Direct Current-Direct Current) converter
  • Isolated Boost double-half-bridge DC-DC (Direct Current-Direct Current) converter
  • Isolated Boost double-half-bridge DC-DC (Direct Current-Direct Current) converter

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0019] figure 1 Among them, the isolated Boost double half bridge DC-DC converter involved in the present invention includes a Boost boost circuit, two voltage type half bridges, two resonant cavities and a full bridge rectifier circuit. Among them, the Boost circuit consists of an input inductor L in , with center-tapped transformer T boost and rectifier diode D 1 、D 2 constitute. Boost transformer T boost The primary side is connected between the middle points a and b of the two half-bridge arms, and the voltage induced on the secondary side passes through the rectifier diode D 1 、D 2 After rectification, it is then compared with the converter input voltage V in Connecting in series achieves the effect of boosting the voltage. Two voltage-type half-bridges respectively constitute module A and module B connected in parallel, and the outputs of each bridge ar...

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Abstract

The invention discloses an isolated Boost double-half-bridge DC-DC (Direct Current-Direct Current) converter. The converter is applied in the fields of direct current micro-grids including energy storage systems, new energy power generation, electric vehicles and the like, and comprises a Boost circuit, two voltage-type half bridges, two resonant cavities and a full-bridge rectifier circuit. The converter is characterized in that ZVS turn-on of switching tubes on a primary size as well as ZCS turn-on and ZCS turn-off of a rectifier diode on a secondary side are realized in a full load range, and conduction loss is reduced greatly. Moreover, the Boost circuit does not need any additional active switching tube device, so that the Boost circuit is simple in structure, and the efficiency of the converter is further increased. The converter has the characteristics of high power density, high efficiency and the like. Moreover, a modular design is adopted, so that parallel operation is facilitated, and the converter is suitable for high-power application occasions.

Description

technical field [0001] The invention relates to the technical field of DC micro-grids, in particular to an isolated Boost double half-bridge DC-DC converter. Background technique [0002] With the development of distributed power sources such as solar cells, fuel cells, wind turbines, gas turbines and biogas power generation, microgrids have emerged as the times require, which is a form of power distribution that effectively utilizes distributed power sources. Compared with the AC microgrid, the DC microgrid is more convenient for the access of distributed power sources, and there are no problems such as synchronization and reactive power flow between distributed power sources, and it is more efficient and energy-saving. It has gradually attracted the attention of more and more scholars at home and abroad. focus on. Among them, the DC power converter (DC-DC) plays a vital role in the DC microgrid system. As an interface circuit, it not only realizes the energy flow between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCY02B70/10
Inventor 王议锋韩富强王成山杨良李微
Owner TIANJIN UNIV
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