A kind of excitation inductance variable llc resonant transformer

A technology of resonant transformer and exciting inductance, applied in variable transformers, inductors, transformers, etc., can solve the problems of not being able to achieve light load efficiency, and not being able to better solve the different requirements and upgrades of LLC resonant converters
CN108667300BActive Publication Date: 2020-06-30HUNAN INSTITUTE OF ENGINEERING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN INSTITUTE OF ENGINEERING
Publication Date
2020-06-30

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Abstract

The invention discloses an LLC resonant transformer with variable excitation inductance. A kind of excitation inductance variable LLC resonant transformer, comprises primary winding 1, main secondary winding 2, auxiliary secondary winding 3, power magnetic core 4, switch 5, AC inductance 6 and 7 with air gap; The two terminals of the AC inductance 6 are respectively connected to the two terminals of the auxiliary secondary winding 3; one terminal of the AC inductance 7 with an air gap passes through a switch 5 and is connected in parallel with the AC inductance 6 with an air gap. Compared with the traditional LLC transformer, the invention can realize a wide gain adjustment range of the LLC resonant converter under heavy load, and a small primary circulation current under light load, thereby effectively improving the output characteristics and light-load efficiency of the LLC resonant converter.
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Description

technical field

[0001] The invention relates to an LLC resonant transformer, which is especially suitable for an LLC resonant converter with a wide range of load variation, can realize the improvement of light load efficiency, and is especially suitable for charging electric vehicle batteries. Background technique

[0002] The LLC resonant converter is one of the most commonly used circuit topologies in switching power supplies at present, because the main power switching device can realize zero-voltage (ZVS) turn-on, and the secondary rectifier diode can realize zero-current turn-off (ZCS). The characteristics of output filter inductance and resonant cavity current waveform close to sine wave make it have the advantages of small electromagnetic interference, high peak efficiency and high power density. However, the LLC resonant converter also has its inherent defects: narrow output voltage regulation range and low light load efficiency, which is a difficult problem that mus...

Claims

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