LLC resonant converter with improved light load performance

A resonant converter, light-load technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems affecting the overall performance of the converter, and improve the voltage regulation ability and transmission efficiency , reduce transformer loss and conduction loss, and improve performance

Active Publication Date: 2021-07-13
SHANGHAI TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, under light load conditions, the system's voltage regulation capability is affected by parasitic parameters, and the system efficiency is limited by the parameters of the converter, which seriously affects the overall performance of the converter.

Method used

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  • LLC resonant converter with improved light load performance
  • LLC resonant converter with improved light load performance
  • LLC resonant converter with improved light load performance

Examples

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Embodiment Construction

[0023] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0024] The proposed light-load performance improvement technique is based on figure 1 In the shown reconfigurable LLC topology, the input voltage is set to 390V, the output voltage is 250-450V, the resonant frequency is set to 140kHz, and the output power range is set to [50W, 1000W].

[0025] The primary side of the topology includes four switching tubes S 1 -S 4 , the secondary side consists of four diodes D 1 -D 4 and a...

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Abstract

The invention provides an LLC resonant converter with improved light load performance. The primary side of a topology based on a light load performance improvement technology comprises four switch tubes S1 to S4, a secondary side comprises four diodes D1 to D4, and the secondary side is connected with a load R through an output capacitor, wherein the diode D1 and the diode D3 are located on a same bridge arm, and the diode D2 and the diode D4 are located on the other bridge arm. The LLC resonant converter is characterized in that the secondary side further comprises a four-quadrant switch S5. In order to improve the light-load performance technology of the LLC resonant converter, a working mode suitable for a light-load condition is added through a circuit reconstruction method on the basis of a traditional LLC circuit, so that the problems of voltage regulation capability and low efficiency of the circuit under the light-load condition are solved, and the high-efficiency power transmission under different load conditions is realized.

Description

technical field [0001] The invention relates to an LLC resonant converter, in particular to an LLC resonant converter with improved light load performance. Background technique [0002] With the continuous development of power electronics technology and the diversification of application scenarios, more and more portable devices with high efficiency and small size are used in daily life. The efficiency and volume requirements for switching power supplies are also getting higher and higher. Improving the efficiency of converters is a key link in solving energy problems. LLC resonant circuit is widely used because of its simple structure, easy to realize soft switching, high efficiency and so on. In the traditional LLC circuit topology, the primary side is a full-bridge inverter structure composed of four MOSFETs, and the secondary side is a full-wave rectifier circuit composed of four diodes. The primary and secondary sides are connected through a resonant network consisti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/088
CPCH02M3/3353H02M1/088Y02B70/10
Inventor 束冬冬王浩宇
Owner SHANGHAI TECH UNIV
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