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A Synchronous Rectification Predictive Control Method for llc Resonant Converter

A resonant converter and predictive control technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve problems such as structural assistance, parasitic parameter influence, and increased loss, so as to improve efficiency, The effect of low hardware requirements and strong anti-interference ability

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing synchronous rectification schemes use auxiliary chips or complex auxiliary circuits, with auxiliary structures, increased losses, and are easily affected by parasitic parameters

Method used

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  • A Synchronous Rectification Predictive Control Method for llc Resonant Converter
  • A Synchronous Rectification Predictive Control Method for llc Resonant Converter
  • A Synchronous Rectification Predictive Control Method for llc Resonant Converter

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with specific examples.

[0016] see figure 1 and figure 2 As shown, in the LLC resonant converter synchronous rectification predictive control method provided in this embodiment, when the switching frequency of the LLC resonant converter is greater than or equal to the resonant frequency , where L r is the resonant inductance value, C r is the resonant capacitance value, set the conduction time of the secondary side switch tube of the LLC resonant converter to be the same as that of the primary side switch tube, that is, the duty cycle is constant at 50% (neglecting the dead time); when the switching frequency of the LLC resonant converter is less than the resonant frequency , first detect the absolute value of the resonant current I when the primary switch of the LLC resonant converter is turned off r0 and the output voltage V of the LLC resonant converter o ,Depend on image 3 The schematic ...

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Abstract

The invention discloses an LLC resonant convert synchronous rectification predictive control method For an LLC resonant converter. Aiming at a problem that when switching frequency of the LLC resonance converter is less than resonant frequency (resonant frequency is shown as in the description wherein Lr is resonant inductance value and Cr is resonant capacitance value)loss increases due to improper duty cycle setting of synchronous rectifier switch that the invention detects excitation current value when the primary side switch tube is turned off, the on-time of the secondary side switch tubein the next cycle is calculated on-line through the excitation current prediction algorithm, so that the on-time of the secondary side switch tube is reasonably set, the efficiency of the LLC resonant converter is improved, special driving hardware is not need to be added, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a synchronous rectification predictive control method for an LLC resonant converter. Background technique [0002] Soft switching technology effectively improves the switching frequency and efficiency of the power supply. Among them, the LLC resonant converter, as a wide input range topology that can realize zero-voltage turn-on in the full load range without adding auxiliary circuits, has been widely used and studied. [0003] In the case of large current output, in order to further improve the efficiency of the LLC resonant converter, synchronous rectification technology can be used. When the switching frequency is greater than or equal to the resonant frequency, the secondary side current is continuous. At this time, the driving signal of the primary side switching tube is synchronous with the current of the secondary side rectifier tube, so the driving signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/088
CPCH02M1/088H02M3/33592Y02B70/10
Inventor 杜贵平梁光耀赖娜
Owner SOUTH CHINA UNIV OF TECH