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Hybrid control method of LLC resonant converter

A resonant converter and hybrid control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of high conduction loss and turn-off loss, and reduce the high-efficiency performance of resonant converters

Pending Publication Date: 2022-05-27
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the smaller the designed excitation inductance, the larger the excitation current and resonant current of the resonant converter, the greater the resulting conduction loss and turn-off loss, which also reduces the high-efficiency performance of the resonant converter

Method used

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  • Hybrid control method of LLC resonant converter
  • Hybrid control method of LLC resonant converter
  • Hybrid control method of LLC resonant converter

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Embodiment Construction

[0012] In order to facilitate the understanding of the embodiments of the present invention, further explanations will be given below with specific embodiments in conjunction with the accompanying drawings, which do not constitute limitations to the embodiments of the present invention.

[0013] like figure 1 The LLC resonant converter shown in this embodiment is composed of a full-bridge switching network, a resonant circuit, an isolation transformer, a rectifier, and a low-pass filter. where S 1 ~S 4 is the primary side switch tube, L r is the resonant inductance, C r is the resonant capacitor, L m is the excitation inductance, D R1 and D R2 is the rectifier diode, C o is the output capacitor, R L for the load.

[0014] In order to facilitate the analysis, the following assumptions are given: all switching devices are ideal components without loss; all passive devices are linear components; input capacitance C in large enough; the input voltage V in Constant; outp...

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Abstract

The invention discloses a hybrid control method of an LLC resonant converter. The LLC resonant converter is composed of a full-bridge switching network, a resonant circuit, an isolation transformer, a rectifier, a low-pass filter and the like. The on-load range is divided into two same conditions of normal on-load and no-load or light-load, which are respectively corresponding to two control modes, that is, PFM control is adopted during normal on-load; and during no-load or light-load, a Burst control mode is adopted. The method comprises the following steps: firstly, modeling an LLC resonant converter through a fundamental wave analysis method (FHA) to obtain an equivalent circuit simplified model; secondly, analyzing the characteristics of the LLC resonant converter in a PFM mode and the characteristics of the LLC resonant converter in a Burst mode; and finally, switching points between LLC resonant converter hybrid control modes are selected to realize hybrid control, so that the switching loss and the conduction loss are reduced, and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to a power electronic converter and its control technology, in particular to a hybrid control method of an LLC resonant converter. Background technique [0002] LLC resonant converter is an attractive isolated DC-DC converter, because it can realize zero voltage switch (ZVS) of primary side switch tube and zero current of secondary side rectifier diode in full load range The zero current switch (ZCS) can reduce switching loss, improve converter efficiency, reduce volume, and improve power density, so it is widely used in computers, communication systems, power battery charging, LED lighting and other fields. [0003] In order to achieve a wide voltage range, the general frequency-controlled resonant converter works in a wide frequency range to adjust the voltage gain. Since the minimum switching frequency corresponds to the maximum magnetic flux density, the wider the frequency adjustment range, the less conducive to the optimal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/088
CPCH02M3/3353H02M1/088Y02B70/10
Inventor 杨旭涛陈才学李彦吕慧香
Owner XIANGTAN UNIV
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