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Overcurrent automatic protection LLC full-bridge converter main circuit and control method

A technology of full-bridge conversion and full-bridge rectification circuit, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., which can solve the lack of hardware automatic overcurrent of LLC resonant full-bridge converter Protection method, unable to directly use LLC resonant full-bridge converter, increase power density and other issues, to achieve the effect of simplifying controller design, improving safety and reliability, and avoiding control delay

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are either complicated to control or cannot be directly applied to LLC resonant full-bridge converters due to the different structure of the main circuit.
The existing scheme of LLC resonant full-bridge converter achieves hardware protection by adding auxiliary transformer and auxiliary rectification circuit, but it increases the volume and is not conducive to improving power density.
LLC resonant full-bridge converter still lacks effective hardware automatic over-current protection method

Method used

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  • Overcurrent automatic protection LLC full-bridge converter main circuit and control method
  • Overcurrent automatic protection LLC full-bridge converter main circuit and control method
  • Overcurrent automatic protection LLC full-bridge converter main circuit and control method

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Embodiment Construction

[0043] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions of 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 only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0044] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may...

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Abstract

The invention discloses an automatic overcurrent protection LLC full-bridge converter main circuit and a control method. The main circuit comprises an input end power supply Vin, controllable switch tubes Sap, San, Sbp and Sbn, auxiliary controllable switch tubes Sa1 and Sa2, auxiliary diodes Da1 and Da2, a resonant capacitor Cr, a high-frequency transformer T, a full-bridge rectifier circuit, an output capacitor Co and an output end load RL. An auxiliary bridge arm formed by an upper bridge arm and a lower bridge arm is added, wherein the upper bridge arm and the lower bridge arm are formed by connecting reverse auxiliary controllable switch tubes Sa1 and Sa2 and forward auxiliary diodes Da1 and Da2 in series, and then the end, connected with a transformer T, of a resonant capacitor Cr on a main circuit structure is connected to the midpoint of the auxiliary bridge arm. By controlling the action of the auxiliary bridge arm, the key technical difficulty of over-current protection of a traditional LLC resonant full-bridge converter system is solved, the active hardware current limiting capability is obtained, the design of over-current detection and protection controllers in the LLC starting and operating process is effectively simplified, the reliability of the system is improved, and potential safety hazards possibly existing in the system are eliminated.

Description

technical field [0001] The present invention is suitable for high-efficiency power conversion occasions of isolated DC converters in fields such as new energy power generation and rail transit auxiliary power supply systems, and specifically relates to a main circuit structure, parameter determination method and control of an LLC resonant full-bridge converter with automatic hardware protection method. Background technique [0002] Solar energy, fuel cells and other new energy power generation and low-carbon transportation have broad development prospects. For example, the distributed power generation system composed of photovoltaic panels and the high-power auxiliary power supply system of rail transit are ushering in rapid development. As an isolated DC - LLC resonant full-bridge converter in the link of DC converter, the main circuit structure is as follows figure 1 As shown, it has been widely used. By controlling the square wave voltage output by the full bridge, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33569H02M1/32Y02B70/10
Inventor 张岩于博洋高晓阳杜思行刘进军
Owner XI AN JIAOTONG UNIV
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