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Wide-gain-range LLC resonant converter and control method thereof

A resonant converter, a range of technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of complex magnetic component design, improve work efficiency, reduce circuit control and drive difficulty , to achieve the effect of fixed frequency control

Active Publication Date: 2020-01-03
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still belongs to frequency conversion control, and the design of magnetic components is still relatively complicated.

Method used

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  • Wide-gain-range LLC resonant converter and control method thereof
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  • Wide-gain-range LLC resonant converter and control method thereof

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Embodiment Construction

[0031] Such as image 3 As shown, the wide gain range LLC resonant converter of this embodiment includes an inverter circuit 10 , an LLC resonant cavity 20 , a transformer T and a rectification network 30 sequentially connected from input to output. In the figure Vin is the input power of the converter, Ro is the output load R of the converter 0 .

[0032]The inverter circuit 10 is a variable topology circuit combining a full bridge / half bridge, and is composed of a switching tube S1, a switching tube S2, a switching tube S3, and a switching tube S4. The LLC resonant cavity 20 includes a resonant inductance Lr, an excitation inductance Lm and a resonant capacitor Cr, and a bidirectional switch composed of a switching tube S5 and a switching tube S6 is additionally provided. The rectification network 30 is a full bridge rectification circuit composed of 4 diodes D1-D4 connected in parallel to output filter capacitor C 0 constitute.

[0033] The drain of the switching tube S...

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Abstract

The invention relates to a wide-gain-range LLC resonant converter and a control method thereof. The converter comprises an inverter circuit, an LLC resonant cavity, a transformer and a rectification network. The LLC resonant cavity comprises resonant inductors Lr and Lm and a resonant capacitor Cr. A two-way switch is additionally arranged in the LLC resonant cavity. The resonant capacitor Cr andthe resonant inductor Lr are sequentially connected in series between a first output end of the inverter circuit and a first end of a primary coil of the transformer. A second output end of the inverter circuit is connected with a second end of the primary coil of the transformer. The resonant inductor Lm is connected with the primary coil of the transformer in parallel. A first end of the two-wayswitch is connected with the first end of the primary coil of the transformer by being connected between the resonant capacitor Cr and the resonant inductor Lr, and a second end of the two-way switchis connected with the second end of the primary coil of the transformer. The inverter circuit is a full-bridge / half-bridge combined variable topology circuit. Through conversion of a full-bridge / half-bridge topological structure, the gain range of the converter is greatly widened. By using the circuit structure, the design difficulty of the converter is reduced.

Description

technical field [0001] The invention relates to the technical field of switching converters, in particular to an LLC resonant converter and a control method thereof. Background technique [0002] The field of power electronics is developing rapidly, and switching converters are used more and more widely. People place more demands on switching converters: high power density, high reliability and small size. As a kind of resonant converter, LLC resonant converter has many advantages, such as low noise, low stress, and low switching loss. LLC resonant converter generally adopts two working modes of variable frequency control and fixed frequency control. However, when the input voltage and load vary widely, the operating frequency of the LLC resonant converter using variable frequency control alone varies widely, which makes the magnetic Component design is difficult, and when the voltage gain is wide, the efficiency of the traditional variable frequency control LLC resonant c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M3/33507H02M1/0048H02M1/0058Y02B70/10
Inventor 余逸群李思远李永昌
Owner MORNSUN GUANGZHOU SCI & TECH
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