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

Active Publication Date: 2020-06-30
HUNAN INSTITUTE OF ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LLC resonant converter also has its inherent defects: the output voltage regulation range is narrow, and the light load efficiency is low, which is a difficult problem that must be solved in the application of electric vehicle battery charging
The document "Light-LoadEfficiency Improvement Strategy for LLC Resonant Converter Utilizing a Step-Gap Transformer" gives a step-gap transformer solution to improve the loss of LLC resonant converter at light load, but the magnetic Core processing is difficult and costs increase
The invention patent "LLC transformer and switching power supply" (patent number: 201611048791.0) realizes adjustable leakage inductance through a special winding structure, but the excitation inductance is not adjustable
The utility model patent "A LLC Transformer" (patent number: 201620955772.5) provides a transformer winding method to reduce the skin effect and proximity effect, but it cannot achieve the improvement of light load efficiency
The scheme described in the above literature cannot better solve the different requirements for K of the LLC resonant converter under heavy load and light load

Method used

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  • A kind of excitation inductance variable llc resonant transformer
  • A kind of excitation inductance variable llc resonant transformer
  • A kind of excitation inductance variable llc resonant transformer

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Embodiment Construction

[0056] Such as figure 1 As shown, an embodiment of the present invention consists of a power magnetic core without an air gap and three windings on it to form the main body of the transformer, and two AC inductors with air gaps are used as AC loads for the main body of the transformer, two of which have Whether the AC inductors of the air gap are connected individually or simultaneously is controlled by the switch 5. When the load is heavy, the two AC inductors are connected at the same time. When the load is light, the switch 5 is disconnected, and only one AC inductor is connected.

[0057] Such as figure 2 Shown is a schematic diagram of the magnetic flux inside the main power core of the transformer. There are 3 windings on the power core, the primary is on the left, and the secondary and auxiliary secondary windings are on the right. primary current i p and the secondary current i s Magnetic flux established in the core respectively and cancel each other out, the...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H01F29/00H01F27/24H01F27/28
CPCH01F27/24H01F27/28H01F29/00H02M3/3353H02M1/0058Y02B70/10
Inventor 赵振兴浣喜明
Owner HUNAN INSTITUTE OF ENGINEERING
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