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Power flow direction mutation delay switching method for dual active full-bridge DC converters

A technology of DC converter and converter, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., and can solve problems such as magnetic core saturation and inductor current exceeding the design peak value.

Active Publication Date: 2021-07-06
FUJIAN NEBULA ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide a method for sudden change and delay switching of the power flow direction of the dual active full bridge DC converter, which solves the problem of direct switching of the existing dual active full bridge isolated bidirectional DC converter when the energy transfer direction changes suddenly The inductor current exceeds its design peak value, causing the problem of core saturation

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  • Power flow direction mutation delay switching method for dual active full-bridge DC converters
  • Power flow direction mutation delay switching method for dual active full-bridge DC converters
  • Power flow direction mutation delay switching method for dual active full-bridge DC converters

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Embodiment Construction

[0030] see Figure 1 to Figure 7Shown, the present invention dual active full-bridge DC converter power flow direction sudden change delay switching method, the following first for the existing converter (circuit topology such as figure 1 Shown) the dual phase-shift control strategy is described:

[0031] Depend on figure 2 It can be seen that when the existing converter adopts the double phase-shift control method, when the forward energy is transferred, the full-bridge phase-shift control of the primary side, the power switch S 1 with power switch S 2 The driving signal is complementary to conduct 180°, the power switch S 3 with power switch S 4 The driving signal is complementary to conduct 180°, the power switch S 4 The drive signal ratio of the power switch S 1 The driving signal delay D 1 T hs , the full bridge on the secondary side adopts the control mode of 180° conduction of each diagonal power switch, that is, the power switch S 5 with power switch S 8 com...

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Abstract

The present invention provides a method for sudden change and delayed switching of the power flow direction of a dual-active full-bridge DC converter. Switching is not performed at the beginning of a cycle, but switching is performed after a delay of half a switching cycle at the beginning of the next switching cycle. The invention has the advantages that it can effectively suppress the maximum value of the inductance current when the forward and reverse power flow is switched, thereby reducing the volume of the magnetic core, improving the power density and the reliability of the converter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for sudden delay switching of the power flow direction of a dual-active full-bridge DC converter. Background technique [0002] Due to the increasing shortage of fossil energy (non-renewable energy) such as oil, coal, and natural gas, serious environmental pollution, global warming, nuclear waste and environmental pollution caused by nuclear energy production, energy and the environment have become major issues facing mankind in the 21st century. . Renewable energy (green energy) such as solar energy, wind energy, tidal energy and geothermal energy has the advantages of being clean, pollution-free, cheap, reliable, and abundant. People are paying more and more attention to the development and utilization of renewable energy. The sustainable development is of great significance. Due to the instability of renewable energy, it is usually necessary to equip a bat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 汤平杨国陈志坚万经邦陈艳慧
Owner FUJIAN NEBULA ELECTRONICS CO LTD