Five-level double-bridge bidirectional isolation type direct current converter

A DC converter, two-way isolation technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, converting AC power input to DC power output, etc., can solve the problem of low energy transmission efficiency, complex converter structure, etc. problems, to achieve the effect of reducing costs, simplifying the drive circuit, and improving efficiency

Inactive Publication Date: 2019-06-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of complex structure and low energy transmission efficiency of existing converters, the present invention provides a five-level double-bridge bidirectional isolated DC converter

Method used

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  • Five-level double-bridge bidirectional isolation type direct current converter
  • Five-level double-bridge bidirectional isolation type direct current converter
  • Five-level double-bridge bidirectional isolation type direct current converter

Examples

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Embodiment 1

[0047] Such as figure 1 As shown, this embodiment provides a five-level double-bridge bidirectional isolated DC converter, which specifically includes: a five-level full-bridge structure on the high-voltage side, a half-bridge structure on the low-voltage side, and a power inductor L 1 and high frequency transformer T 1 ;

[0048] The lead-out terminals of the five-level full-bridge structure pass through the power inductor L 1 with high frequency transformer T 1 The original edge connection;

[0049] The lead-out terminals of the half-bridge structure on the low-voltage side and the high-frequency transformer T 1 side connections.

[0050] Specifically, the application of a high-frequency transformer enables the electrical isolation of the high-voltage side and the low-voltage side, which can obtain a higher voltage ratio and is suitable for higher power.

[0051] For example, the five-level full-bridge structure on the high-voltage side includes: the high-voltage side ...

Embodiment 2

[0070] In this embodiment, the first switch tube to the tenth switch tube use IGBT modules; 1 , S 2 Respectively with the switch tube S 3 , S 4 The turn-on and turn-off signals are complementary, and the switch tube S 5 , S 6 Respectively with the switch tube S 7 , S 8 The turn-on and turn-off signals are complementary. Specifically, the drive signals of the switch tubes are shown in Table 1. By controlling the on-off of the switch tubes, a five-level line voltage output can be obtained, corresponding to the low-voltage side. At the same time, the two switch tubes S9 and S10 are only There is a plus conduction signal; during use, the switch tube S9 is turned on, the output voltage is E2 / 2, the switch tube S10 is turned on, and the output voltage is -E2 / 2, as shown in Table 1; by controlling the secondary output side The phase angle difference between the square wave and the output square wave of the primary side can control the voltage on both sides of the inductor L1, ...

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Abstract

The invention relates to a five-level double-bridge bidirectional isolation type direct current converter. The five-level double-bridge bidirectional isolation type direct current converter comprisesa five-level full-bridge structure at a high-voltage side, a half-bridge structure at the low-voltage side, a power inductor and a high-frequency transformer; a leading-out terminal of the five-levelfull-bridge structure is connected with the primary side of the high-frequency transformer through the power inductor; and a leading-out terminal of the half-bridge structure at the low-voltage side is connected with the secondary side of the high-frequency transformer. Compared with a traditional bidirectional symmetrical full-bridge circuit, the converter has the advantages that the use quantityof controllable switch tubes is reduced on the low-voltage side, the driving circuit is simplified, and the cost is effectively lowered; and meanwhile, the backflow power is reduced by virtue of theeffect of the phase shifting control, the overall energy transmission efficiency is further improved, and the method can be widely applied to occasions with relatively high direct-current conversion rate.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a five-level double-bridge bidirectional isolation DC converter. Background technique [0002] With the rapid development of the economy, the contradiction between energy demand and the shortage of non-renewable resources has become increasingly prominent; in recent years, renewable energy has developed rapidly, such as the application of solar energy and wind energy in the power generation industry. Microgrid systems based on renewable energy and energy storage components have been widely used in power systems. However, with the access of new energy sources such as solar energy and wind energy, due to the constraints of natural conditions, its unstable performance will affect the quality of electric energy, and then interfere with the normal operation of the power system to a certain extent; [0003] Existing DC converters adopt a bidirectional full-bridge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/483
Inventor 宋崇辉赵世超宋家祥刁乃哲孙先瑞李坤高俊山
Owner NORTHEASTERN UNIV
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