A Predictive Charge Control Method for llc Resonant Converter

A resonant converter and charge control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as complex trajectory control, and achieve strong robustness, easy constraints, and excellent dynamics The effect of response speed

Active Publication Date: 2021-12-17
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optimal trajectory control based on state plane analysis can provide good dynamic characteristics for LLC resonant converters, however, its trajectory control becomes quite complicated due to the increase of state variables and the change of operation mode

Method used

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  • A Predictive Charge Control Method for llc Resonant Converter
  • A Predictive Charge Control Method for llc Resonant Converter
  • A Predictive Charge Control Method for llc Resonant Converter

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with specific examples.

[0042] This embodiment provides a method for predictive charge control of an LLC resonant converter, such as figure 1 As shown, the LLC resonant converter includes an input DC power supply, a primary-side full-bridge inverter circuit, a resonant cavity, a transformer, a secondary-side full-bridge rectifier circuit, and an output filter circuit. The input DC power supply, primary-side full-bridge inverter circuit The transformer circuit and the resonant cavity are connected in sequence, the resonant cavity is connected to the primary side of the transformer, and the secondary side of the transformer is connected to the output filter circuit through the secondary side full-bridge rectifier circuit; the primary side full-bridge inverter circuit includes Four switching tubes Q 1 , Q 2 , Q 3 , Q 4 , switch Q 1 , Q 3 Form a pair of bridge arms, the switching tube Q 2 , Q 4 f...

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Abstract

The invention discloses a predictive charge control method for an LLC resonant converter, which adjusts the trigger pulse width by predicting the voltage threshold of the resonant capacitor, thereby accelerating the dynamic response without sacrificing the steady-state performance. Charge control uses the resonant capacitor voltage as negative feedback to control the on and off of the switch tube according to the input charge of the converter in each cycle, so as to achieve the purpose of adjusting the output voltage. The present invention predicts the resonant capacitance voltage threshold V when the switching tube operates at the next moment based on the discrete prediction model H and V L , when the resonant capacitor voltage V Cr greater than V H Then turn off the corresponding switch tube Q 1 and Q 4 and turns on Q 2 and Q 3 , when the resonant capacitor voltage V Cr below V L Then turn off the corresponding switch tube Q 1 and Q 4 and turns on Q 2 and Q 3 . The method of the invention is convenient and simple to implement, has excellent dynamic characteristics under various working conditions, and can force the resonant cavity to enter a stable state within one cycle without affecting the steady-state performance of the system.

Description

technical field [0001] The invention relates to the technical field of LLC resonant converter control, in particular to a predictive charge control method of an LLC resonant converter. Background technique [0002] Due to its high frequency, high power density, high efficiency, and small switching stress, LLC resonant converters are widely used in battery chargers, electric vehicles, uninterruptible power supplies, renewable energy, energy storage systems, and aviation power systems. [0003] The control method of traditional LLC resonant converter is pulse frequency modulation. The control methods proposed to improve the dynamic performance of LLC resonant converters include: average current mode control, sliding mode control, and optimal trajectory control. The average current mode control based on LLC resonant converter adds a low-pass filter to the resonant current detection circuit to obtain its average current value, which maintains better dynamic performance under di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569Y02B70/10
Inventor 杜贵平陈思强雷雁雄李土焕郑燕宾
Owner SOUTH CHINA UNIV OF TECH
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