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High-efficiency modulation method in the full power range of dual active full-bridge converters

A dual-active, converter technology, applied to DC power input conversion to DC power output, output power conversion devices, instruments, etc., can solve problems such as difficult to obtain control quantity expressions, achieve small current distortion, analytical The expression is concise and the effect of improving efficiency

Active Publication Date: 2019-01-22
SHANGHAI JIAOTONG UNIV
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  • Description
  • Claims
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Problems solved by technology

Since this is not a traditional convex optimization problem, the feasible region of the problem is non-convex, there are limitations in directly using existing convex optimization methods, and it is necessary to solve high-order algebraic equations, so it is difficult to obtain the expression between the control quantities

Method used

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  • High-efficiency modulation method in the full power range of dual active full-bridge converters
  • High-efficiency modulation method in the full power range of dual active full-bridge converters
  • High-efficiency modulation method in the full power range of dual active full-bridge converters

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0052] see first figure 1 , figure 1 It is a system configuration diagram of the high-efficiency modulation method in the full power range of the dual active full-bridge converter of the present invention. image 3 It is a calculation step of each control variable in the current effective value minimization modulation method.

[0053] The specific implementation of the high-efficiency modulation method in the full power range of the dual active full-bridge converter of the present invention is as follows:

[0054] According to the input voltage V of the converter in steady state operation 1 , output voltage V 2 and transformer ratio n, according to formula (1) to calculate the voltage transfer ratio M. Input voltage V 1 , output voltage V 2 And the transformation rat...

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Abstract

A modulation method with high efficiency in a dual-active full-bridge converter full power range is a modulation method through adoption of three controlled quantities consisting of a primary side full-bridge internal phase-shift ratio, a secondary full-bridge internal phase-shift ratio and a phase-shift ratio between primary secondary side of the dual-active full-bridge converter to allow the dual-active full-bridge converter in the full power range to reduce the distortion currents to the lowest in the work of the convertor so as to reduce the stress of a switch device in the convertor and realize the improvement of the whole efficiency of the convertor. The modulation method with the high efficiency in dual-active full-bridge converter full power range provides an analytical expression among three control quantities, and is simple in computing process and easy to realize.

Description

technical field [0001] The invention relates to a DC / DC converter, in particular to a high-efficiency modulation method within the full power range of a dual-active full-bridge converter. Background technique [0002] With the development of power electronics technology, high-frequency isolated power conversion technology will be more and more applied to the power grid, becoming an important means to realize fast and flexible control in the power grid. The Dual Active Bridge-Isolated Bidirectional DC / DC Converter (DAB for short) based on Phase shift modulation scheme (PSMS) technology has high power density, fast dynamic response, easy soft switching, Power can flow in both directions and other advantages, and it is very popular in occasions such as uninterruptible power supplies, electric vehicles, and solid-state transformers. The common control method of DAB converter is phase-shift control, which generates a voltage square wave with relative phase shift at the primary p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33515H02M3/33584
Inventor 李国杰童安平江秀臣
Owner SHANGHAI JIAOTONG UNIV
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