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LLC converter modulation method capable of realizing natural bidirectional power flow

A modulation method and converter technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems that cannot realize natural two-way power flow, etc.

Active Publication Date: 2019-07-19
CENT SOUTH UNIV
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Problems solved by technology

Therefore, the LLC resonant converter operating under the traditional modulation method cannot realize natural bidirectional power flow

Method used

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  • LLC converter modulation method capable of realizing natural bidirectional power flow
  • LLC converter modulation method capable of realizing natural bidirectional power flow
  • LLC converter modulation method capable of realizing natural bidirectional power flow

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Embodiment Construction

[0061] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0062] In the embodiment of the present invention, refer to Figure 1-2 , the present invention takes the bidirectional full-bridge LLC converter as the research object, and the two sets of switch tubes on the high-voltage side and the low-voltage side are turned on and off at the same time.

[0063] Bidirectional full-bridge LLC resonant converter topology such as figure 2 as shown, ...

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Abstract

The invention provides an LLC converter modulation method capable of realizing natural bidirectional power flow. According to the modulation method, pulse width modulation (PWM) signals of a high-voltage side and a low-voltage side are completely consistent, and direction judgment and mode switching are not needed, thereby achieving the natural bidirectional flowing of energy, reducing the complexity of bidirectional system control, and improving the reliability of the system. An LLC converter working under the modulation method can realize constant voltage gain, and the essence of the LLC converter can be equivalent to a DC transformer (DCX). Furthermore, the modulation method achieves a zero voltage switch (ZVS) at one side and a zero current switch (ZCS) at the other side.

Description

technical field [0001] The present invention relates to the field of bidirectional DC-DC converters, and more particularly relates to a modulation method of an LLC converter capable of realizing natural bidirectional power flow. Background technique [0002] In recent years, isolated bidirectional DC-DC converters have developed rapidly and are widely used in electric vehicles, uninterruptible power supplies and energy storage systems. [0003] Considering the power topology of these applications, one solution is the dual active full bridge (DAB) converter. It has the advantages of symmetrical structure, zero-voltage turn-on capability, and natural two-way power flow control. However, due to the limitation of the soft switching range and the large turn-off current, the power conversion efficiency is reduced. [0004] Considering the efficiency issue, the LLC resonant converter is another attractive topology because of its soft-switching characteristics suitable for all pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/3353H02M3/33584H02M3/33592Y02B70/10
Inventor 粟梅蒋涛文徐菁涛许国但汉兵孙尧王辉刘永露熊文静
Owner CENT SOUTH UNIV
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