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An isolated bidirectional dc-dc converter and its modulation method

A technology of DC-DC and modulation method, applied in the field of isolated bidirectional DC-DC converter and modulation, can solve the problems of poor adjustment effect and narrow adjustable range of voltage gain, and achieve the effect of improving operation efficiency

Active Publication Date: 2020-02-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as the inventor knows, traditional series resonant converters and LLC resonant converters use frequency modulation to adjust their voltage gain, and the adjustable range of voltage gain is narrow, especially in light-load operation, the adjustment effect is poor

Method used

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  • An isolated bidirectional dc-dc converter and its modulation method
  • An isolated bidirectional dc-dc converter and its modulation method
  • An isolated bidirectional dc-dc converter and its modulation method

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Embodiment Construction

[0045] The present disclosure will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0047] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or ...

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Abstract

The present disclosure provides a high-efficiency high-frequency isolated bidirectional DC-DC converter and its modulation method. The converter includes a transformer primary side bus capacitor, a transformer primary side full bridge circuit, a first LC branch, and an LC circuit connected in sequence. Resonant network, second LC branch, transformer, transformer secondary full bridge circuit and secondary bus capacitance. The converter of the present disclosure can meet the requirement of operating in a wide voltage range between different DC buses, or between a DC bus and an energy storage battery, no matter in the forward / reverse, boost / down mode.

Description

technical field [0001] The present disclosure relates to the technical field of DC-DC converters, in particular to an isolated bidirectional DC-DC converter and a modulation method thereof. Background technique [0002] The energy storage system with lithium-ion battery as the core is indispensable in the fields of new energy power generation and electric vehicles, so higher requirements are put forward for the bidirectional power conversion system for charging and discharging, including wide voltage operating range, high efficiency and electrical isolation etc. The series resonant converter or LLC resonant converter has natural soft-switching characteristics and relatively high operating efficiency, which has become a hot spot in research and application. However, as far as the inventors know, traditional series resonant converters and LLC resonant converters use frequency modulation to adjust their voltage gain, and the adjustable range of voltage gain is narrow, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0058Y02B70/10
Inventor 张承慧杨东江段彬宋金秋丁文龙
Owner SHANDONG UNIV
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