Circuit structure and control method for realizing wide-gain FB-HB LLC resonant converter

A FB-HBLLC, resonant converter technology, used in control/regulation systems, DC power input conversion to DC power output, instruments, etc. Unstable work, etc.

Pending Publication Date: 2019-08-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, a wide range of switching frequencies is not desirable because it has an adverse effect on the performance of the resonant converter,

Method used

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  • Circuit structure and control method for realizing wide-gain FB-HB LLC resonant converter
  • Circuit structure and control method for realizing wide-gain FB-HB LLC resonant converter
  • Circuit structure and control method for realizing wide-gain FB-HB LLC resonant converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] The wide-gain FB-HB LLC resonant converter topology is as follows figure 1 As shown, the entire resonant converter topology is divided into three parts, the first part is the switching network, the second part is the resonant network, and the third part is the rectifying and filtering network.

[0065] The first part of the switch network includes the power switch tube Q 1 , Q 2 , Q 3 , Q 4 , power switch junction capacitance C 1 、C 2 、C 3 、C 4 , power switch body diode D 1 、D 2 、D 3 、D 4 , input voltage V in , the midpoint potentials A and B of the two bridge arms. The second part of the resonant network consists of the resonant capacitor C r , resonant inductance L r , the magnetizing inductance L of the transformer primary winding m . The third part of the rectification and filtering network includes the inductance L of the four windings on the secondary side of the transformer S1 , L S2 , L S3 , L S4 , freewheeling diode D R1 、D R2 、D R3 、D R...

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Abstract

The invention discloses a circuit structure for realizing a wide-gain FB-HB LLC resonant converter and a control method. The whole resonant converter topological structure is divided into three parts:the first part is a switch network module, the second part is a resonant network module, and the third part is a rectifying and filtering network module. Under the condition that a power supply end of the resonant converter is not turned off, the duty ratio of the power switch tube is controlled through a digital control module to realize dynamic conversion; and in order to achieve a wider outputvoltage range, a method for adding a winding to a secondary side is used for obtaining a proper output voltage by controlling a power switch tube at the secondary side of the resonant converter.

Description

technical field [0001] The present invention relates to the technical field of full bridge / half bridge LLC resonant converter, in particular to a circuit structure and method based on HB (half bridge), FB (full bridge) LLC (inductance L, capacitor C) resonant converter to realize the output voltage A wider description. Background technique [0002] In many applications, resonant converters are required to operate over a wide output range. For example, the output voltage requirements of resonant converters used in current electric vehicle charging equipment and outdoor lighting equipment range from 24V to 144V. In order to provide a wide range of stable output voltages for power application equipment, traditional half-bridge / full-bridge LLC resonant converters control the output voltage range by changing the operating frequency of the power switch tube, that is, changing the gain of the resonant converter. This control method is easy to implement and has a simple topology. ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/3353Y02B70/10
Inventor 李优新赵付立李志忠刘剑彬王波波
Owner GUANGDONG UNIV OF TECH
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