Soft start and light load control method and device for dual-active full-bridge DC-DC converter

A technology of DC-DC and control method, which is applied in the field of soft start and light-load control of dual active full-bridge DC-DC converters, can solve the problems of high output voltage of DAB circuit and incapable of voltage regulation control, and achieve voltage stable effect

Pending Publication Date: 2022-01-04
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

As a result, the output voltage of the DAB circuit is too high when it is lightly loaded, and the voltage stabilization control cannot be performed.

Method used

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  • Soft start and light load control method and device for dual-active full-bridge DC-DC converter
  • Soft start and light load control method and device for dual-active full-bridge DC-DC converter
  • Soft start and light load control method and device for dual-active full-bridge DC-DC converter

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Embodiment Construction

[0086] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and those skilled in the art can also apply the present application to other similar scenarios. Unless otherwise apparent from context or otherwise indicated, like reference numerals in the figures represent like structures or operations.

[0087] As indicated in this application and claims, the terms "a", "an", "an" and / or "the" do not refer to the singular and may include the plural unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and ...

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Abstract

The invention discloses a soft start and light load control method and device for a dual-active full-bridge DC-DC converter, wherein the converter comprises a plurality of switch tubes of a primary side bridge and a plurality of switch tubes of a secondary side bridge. The method comprises the following steps: 1, in a first PWM period, setting a switch-on duty ratio D of switch tubes to be 0.5, the internal shift ratio D1 of a primary side bridge to be 1, the external shift ratio D2 between the primary side bridge and a secondary side bridge to be 0, and the internal shift phase ratio D3 of the secondary side bridge to be 1; 2, obtaining the difference between an output reference voltage and an output voltage, and obtaining an output duty ratio DP through proportional-integral adjustment processing; 3, judging different modes according to the output duty ratio DP; 4, generating control pulses of a primary side bridge switch tube and a secondary side bridge switch tube according to the output duty ratio; and 5, returning to the step 2 under the condition that a shutdown instruction is not received or a fault occurs. According to the invention, the working mode is flexibly selected according to the PI adjustment output range, and the soft start of the DAB circuit and the voltage stability in the full-load range are realized.

Description

technical field [0001] The invention relates to a high-frequency switching power supply in the field of power electronics, in particular to a soft-start and light-load control method and device for a dual-active full-bridge DC-DC converter. Background technique [0002] Energy transmission between different voltage levels can be realized by adopting an isolated DC-DC converter (Dual Active Bridge, DAB for short) topology. As a high-efficiency DC converter, the dual active full-bridge DC-DC converter has the advantages of high power density, wide input and output voltage range, symmetrical structure, and small voltage and current stress of switching devices. It is used in DC microgrids. All kinds of medium and high power occasions in system and energy storage system. The dual active full-bridge DC-DC converter has three controllable variables. According to the combination of these three variables, there are generally three types of control methods: traditional single phase s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33584
Inventor 刘可安尚敬李炳璋徐绍龙甘韦韦郭维赵清良曾明高何乔袁芳丁磊磊杜超林超勇彭学标羊利芬莫劲威
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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