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Hybrid LLC resonant converter topological structure based on working mode switching and control method

A technology of resonant converter and working mode, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, instruments, etc. It can solve problems such as uneven current distribution and increased switching loss, so as to improve efficiency and reduce The effect of loss

Pending Publication Date: 2021-09-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the adjustment range is improved, the current is not evenly distributed between the switches, and an extra switch is added, which increases the switching loss

Method used

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  • Hybrid LLC resonant converter topological structure based on working mode switching and control method
  • Hybrid LLC resonant converter topological structure based on working mode switching and control method
  • Hybrid LLC resonant converter topological structure based on working mode switching and control method

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0038] A hybrid LLC resonant converter topology based on working mode switching, including a main circuit 1 and a control circuit 7, characterized in that the main circuit 1 includes an input-side inverter network 2, an LLC resonant network 3, and a high-frequency transformer T 1 and T 2 4. The secondary-side rectification and filtering network 5 and the voltage dividing sampling circuit 6 , the control circuit 7 includes an output current and voltage sampling circ...

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Abstract

The invention discloses a hybrid LLC resonant converter topological structure based on working mode switching in the technical field of isolated switching power supplies, which comprises a main circuit and a control circuit, wherein the main circuit comprises an input side inverter network, an LLC resonant network, high-frequency transformers T1 and T2, a secondary side rectifier filter network and a voltage division sampling circuit, and the control circuit comprises an output current and voltage sampling circuit, a digital controller and a driving circuit. According to the invention, the switching-on and switching-off of four switching tubes of the hybrid LLC resonant converter are changed by controlling a PWM modulation signal, so that the topological structure conversion of the full-bridge LLC resonant converter and the half-bridge LLC resonant converter can be realized, no extra switching device needs to be added, and through the switching of the working modes of the hybrid LLC resonant converter, the loss of the LLC resonant converter under the light load condition is reduced, the efficiency of the converter is improved, electric energy is output through the single transformer and the two switching tubes in the later period of the charging process, and the problem of low efficiency during light load is solved.

Description

technical field [0001] The invention relates to the technical field of isolated switching power supplies, and in particular to a hybrid LLC resonant converter topology and control method based on working mode switching. Background technique [0002] With the rapid development of power electronics technology, switching power converters have been widely used. Among them, the LLC resonant converter has a simple structure and high conversion efficiency, and has great advantages in the design of high-power charging circuits. However, the LLC resonant converter has problems such as low light-load efficiency and difficult design of high-power transformers, so the improved LLC resonant converter has attracted more and more attention. [0003] Aiming at the problems existing in the LLC resonant converter, the published document "Full-bridge LLC resonant converter with series-parallel connected transformers for electric vehicle on-board charger" proposes a full-bridge LLC resonant co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335B60L53/20
CPCH02M3/33569B60L53/20Y02T10/70Y02T10/72Y02T10/7072Y02T90/14Y02T10/92
Inventor 方炜王伟齐楠刘晓东刘宿城
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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