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Wide-gain common-ground asymmetric h-bridge bidirectional DC converter for energy storage systems

A bidirectional DC conversion and DC converter technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, output power conversion devices, etc., can solve the problem of reducing the power density of converters and restricting the application of bidirectional DC converters , bidirectional DC converter input and output are not common ground and other problems

Inactive Publication Date: 2019-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The input and output of the traditional bidirectional DC converter do not share the same ground, and it operates at an extreme duty cycle when the gain is wide. In addition, the presence of transformers and coupled inductors in the transformation link reduces the power density of the converter and makes it difficult to package, and the existing leakage inductance and Electromagnetic interference can easily lead to excessive voltage stress on power devices
These restrict the application of this type of bidirectional DC converter in energy storage systems

Method used

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  • Wide-gain common-ground asymmetric h-bridge bidirectional DC converter for energy storage systems
  • Wide-gain common-ground asymmetric h-bridge bidirectional DC converter for energy storage systems
  • Wide-gain common-ground asymmetric h-bridge bidirectional DC converter for energy storage systems

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Embodiment 1

[0033] A wide-gain common-ground asymmetric H-bridge bidirectional DC converter for energy storage systems, see figure 1 , the common-ground asymmetric H-bridge bidirectional DC converter is as follows:

[0034] 1. Topology:

[0035] The common-ground asymmetrical H-bridge bidirectional DC converter alternately stores energy and releases energy through the inductor L to realize step-down (Buck) and boost (Boost).

[0036] figure 2 , image 3 It is the schematic diagram of Buck mode operation of the common-ground asymmetric H-bridge bidirectional DC converter, the operation drive signal and the dead zone. Figure 4 , Figure 5 It is the schematic diagram of the Boost mode operation of the common-ground asymmetrical H-bridge bidirectional DC converter, the operating drive signal and the dead zone.

[0037] 2. Wide voltage gain

[0038] 1. Buck mode

[0039] When the common-ground asymmetrical H-bridge bidirectional DC converter operates in the step-down (Buck) state, its...

Embodiment 2

[0062] Below to figure 1 common-ground asymmetric H-bridge bidirectional DC converter and figure 2 , Figure 4 The shown modulation strategy describes the principles and best implementation modes of the embodiments of the present invention. In each carrier period, the converter experiences three switching states in total, and the Buck and Boost modes of the converter will be described respectively below.

[0063] 1. Buck mode

[0064] 1. Switch state S 1 S 3 =10, the inductor current i L by Q D4 freewheeling, i L Gradually decreases, the energy on the inductance L is gradually consumed on the low-voltage energy storage device, the energy storage on the inductance L decreases, and the converter has a voltage closed loop: U l -Q D4 -L-U l , recorded as a closed loop (1-a), in the closed loop (1-a), the inductor L releases energy and supplies energy to the low-voltage energy storage device. The total time experienced by the switching state t 10 =(1-d 3 )T.

[0065]...

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Abstract

The invention discloses a wide-gain common-ground asymmetric H-bridge bidirectional DC converter for an energy storage system. Common ground of input and output of the DC converter is realized, the asymmetric H-bridge structure is adopted, all switch transistors in a topological structure adopt controlled power transistors with low on-state resistance; the DC converter stores energy and releases energy alternatively through an inductor, thereby realizing step-down and step-up; the DC converter uses marrow pulse voltage for step-down and step-up, and while large-proportion step-down and step-up are realized, power switches can operate at a non extreme duty cycle near 0.5. The bidirectional DC converter in the asymmetric H-bridge structure is formed through the controllable power switches which are easy to integrate, the volume of the converter is reduced, the power density is increased, the input and output common-ground topological structure is adopted, the duty cycle is near 0.5 in the case of wide-gain operation, and an extreme duty cycle condition is avoided.

Description

technical field [0001] The invention relates to the application field of bidirectional DC converters for energy storage systems, in particular to a wide-gain common-ground asymmetric H-bridge bidirectional DC converter for energy storage systems, which belongs to the technical field of power electronic power conversion. Background technique [0002] With the intensification of the global energy crisis and the worsening of environmental pollution, the development and application of new energy has become a research hotspot in various countries in recent years. As an essential support link for new energy access and the development of electric vehicles, the research on energy storage systems and related technologies has received more and more attention and attention. As the key interface between the low-voltage energy storage equipment and the high-voltage busbar in the energy storage system, the bidirectional DC converter is widely used in the application of bidirectional energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
Inventor 张云高永平周雷王萍
Owner TIANJIN UNIV
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